133 results on '"Ramirez, AM"'
Search Results
2. Tiempo y vida cotidiana. La mujeres come sujetos de innovación cultural
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Cárdenas Tomažič, A, Yévenes Ramirez, AM, Leccardi, C, Cárdenas Tomažič, A, Yévenes Ramirez, AM, and Leccardi, C
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- 2018
3. Understanding abortion seeking and care outside of legal public sector services in South Africa: a qualitative study
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Ramirez, AM, primary, Jayaweera, RT, additional, Mtimkulu, M, additional, Bessenaar, T, additional, Chollampat, N, additional, and Gerdts, C, additional
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- 2017
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4. Advancing the Science of Cancer in Latinos
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Ramirez, Amelie G. and Trapido, Edward J.
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Latinx cancer ,Health equity ,health threats in the Latino\Latina community ,vulnerable populations and cancer health disparities ,cancer outcomes and survivorship ,precision medicine ,engaging Latinos in cancer research ,emerging healthcare policies ,implementation science and innovative technology ,hot topics in Latino\Latina cancer health disparities ,cancer and lifestyles ,cancer patient advocacy ,cancer therapies and clinical trials ,HPV vaccination for cancer prevention ,Oncology ,Social and ethical issues ,Public health and preventive medicine ,Health economics ,Cultural studies - Abstract
This open access book is a collection of articles based on presentations from the 2020 Advancing the Science of Cancer in Latinos conference that gives an overview of conference outcomes. The vision of the conference has been to unite researchers, scientists, physicians and other healthcare professionals, patient advocates, and students from across the world to discuss research advancements, identify gaps, and develop actionable goals to translate basic research findings into clinical best practices, effective community interventions, and professional training programs to decrease cancer risks and eliminate cancer disparities for Latinos. This conference comes at an especially important time when Latinos – the largest and youngest minority group in the U.S. – are expected to face a 142% rise in cancer cases in the coming years. Disparities continue to impact this population in critical areas: access to preventive and clinical care, changeable risk behaviors, quality of life, and mortality. Each chapter summarizes the presentation and includes current knowledge in the specific topic areas, identified gaps, and opportunities for future research. Topics explored include: Applying an Exposome-Wide (ExWAS) Approach to Latino Cancer Disparities Supportive Care Needs and Coping Strategies Used by Latino Men Cancer Survivors Optimizing Engagement of the Latino Community in Cancer Research Latino Population Growth and the Changing Demography of Cancer Implementation Science to Enhance the Value of Cancer Research in Latinos A Strength-Based Approach to Cancer Prevention in Latinxs Overcoming Clinical Research Disparities by Advancing Inclusive Research Advancing the Science of Cancer in Latinos: Building Collaboration for Action will appeal to a wide readership due to its comprehensive coverage of topics ranging from basic science and community prevention research to clinical practice to policy. The book is an essential resource for physicians and other medical professionals, researchers, scientists, academicians, patient advocates, and students. It also will appeal to policy-makers, NCI-designated cancer centers, academic centers, state health departments, and community organizations.
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- 2022
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5. The morphotype, and the residual TPP-1 enzyme activity correlate with the underlying mutations in theTPP1/CLN2gene of Neuronal Ceroid Lipofuscinoses Late Infantile and variant Juvenile
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Noher de Halac, I, Pons, P, Carabelos, N, Guelbert, N, Dodelson de Kremer, R, Cismondi, IA, Alonso, GI, Oller-Ramirez, AM, and Kohan, R
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ddc: 610 ,610 Medical sciences ,Medicine - Abstract
CLN2 (OMIM #204500) is a children's neurodegenerative disorder resulting from a deficiency of the lysosomal enzyme Tripeptidyl-Peptidase-1 (TPP1) encoded by the geneTPP1/CLN2. Inheritance is autosomal recessive. The aim was to investigate the possible correlations among the clinical phenotypes[for full text, please go to the a.m. URL], 57th Annual Meeting of the German Society for Neuropathology and Neuroanatomy (DGNN)
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- 2012
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6. Latinx Students' Sense of Familismo in Undergraduate Science and Engineering
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López, Enrique J., Basile, Vincent, Landa-Posas, Magnolia, Ortega, Kaylee, and Ramirez, America
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- 2019
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7. Planning the Human Variome Project: The Spain Report
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Kaput, J, Cotton, RGH, Hardman, L, Watson, M, Al Aqeel, AI, Al-Aama, JY, Al-Mulla, F, Alonso, S, Aretz, S, Auerbach, AD, Bapat, B, Bernstein, IT, Bhak, J, Bleoo, SL, Bloecker, H, Brenner, SE, Burn, J, Bustamante, M, Calone, R, Cambon-Thomsen, A, Cargill, M, Carrera, P, Cavedon, L, Cho, YS, Chung, Y-J, Claustres, M, Cutting, G, Dalgleish, R, den Dunnen, JT, Diaz, C, Dobrowolski, S, dos Santos, MRN, Ekong, R, Flanagan, SB, Flicek, P, Furukawa, Y, Genuardi, M, Ghang, H, Golubenko, MV, Greenblatt, MS, Hamosh, A, Hancock, JM, Hardison, R, Harrison, TM, Hoffmann, R, Horaitis, R, Howard, HJ, Barash, CI, Izagirre, N, Jung, J, Kojima, T, Laradi, S, Lee, Y-S, Lee, J-Y, Gil-da-Silva-Lopes, VL, Macrae, FA, Maglott, D, Marafie, MJ, Marsh, SGE, Matsubara, Y, Messiaen, LM, Moeslein, G, Netea, MG, Norton, ML, Oefner, PJ, Oetting, WS, O'Leary, JC, Oller de Ramirez, AM, Paalman, MH, Parboosingh, J, Patrinos, GP, Perozzi, G, Phillips, IR, Povey, S, Prasad, S, Qi, M, Quin, DJ, Ramesar, RS, Richards, CS, Savige, J, Scheible, DG, Scott, RJ, Seminara, D, Shephard, EA, Sijmons, RH, Smith, TD, Sobrido, M-J, Tanaka, T, Tavtigian, SV, Taylor, GR, Teague, J, Toepel, T, Ullman-Cullere, M, Utsunomiya, J, van Kranen, HJ, Vihinen, M, Webb, E, Weber, TK, Yeager, M, Yeom, YI, Yim, S-H, Yoo, H-S, Kaput, J, Cotton, RGH, Hardman, L, Watson, M, Al Aqeel, AI, Al-Aama, JY, Al-Mulla, F, Alonso, S, Aretz, S, Auerbach, AD, Bapat, B, Bernstein, IT, Bhak, J, Bleoo, SL, Bloecker, H, Brenner, SE, Burn, J, Bustamante, M, Calone, R, Cambon-Thomsen, A, Cargill, M, Carrera, P, Cavedon, L, Cho, YS, Chung, Y-J, Claustres, M, Cutting, G, Dalgleish, R, den Dunnen, JT, Diaz, C, Dobrowolski, S, dos Santos, MRN, Ekong, R, Flanagan, SB, Flicek, P, Furukawa, Y, Genuardi, M, Ghang, H, Golubenko, MV, Greenblatt, MS, Hamosh, A, Hancock, JM, Hardison, R, Harrison, TM, Hoffmann, R, Horaitis, R, Howard, HJ, Barash, CI, Izagirre, N, Jung, J, Kojima, T, Laradi, S, Lee, Y-S, Lee, J-Y, Gil-da-Silva-Lopes, VL, Macrae, FA, Maglott, D, Marafie, MJ, Marsh, SGE, Matsubara, Y, Messiaen, LM, Moeslein, G, Netea, MG, Norton, ML, Oefner, PJ, Oetting, WS, O'Leary, JC, Oller de Ramirez, AM, Paalman, MH, Parboosingh, J, Patrinos, GP, Perozzi, G, Phillips, IR, Povey, S, Prasad, S, Qi, M, Quin, DJ, Ramesar, RS, Richards, CS, Savige, J, Scheible, DG, Scott, RJ, Seminara, D, Shephard, EA, Sijmons, RH, Smith, TD, Sobrido, M-J, Tanaka, T, Tavtigian, SV, Taylor, GR, Teague, J, Toepel, T, Ullman-Cullere, M, Utsunomiya, J, van Kranen, HJ, Vihinen, M, Webb, E, Weber, TK, Yeager, M, Yeom, YI, Yim, S-H, and Yoo, H-S
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The remarkable progress in characterizing the human genome sequence, exemplified by the Human Genome Project and the HapMap Consortium, has led to the perception that knowledge and the tools (e.g., microarrays) are sufficient for many if not most biomedical research efforts. A large amount of data from diverse studies proves this perception inaccurate at best, and at worst, an impediment for further efforts to characterize the variation in the human genome. Because variation in genotype and environment are the fundamental basis to understand phenotypic variability and heritability at the population level, identifying the range of human genetic variation is crucial to the development of personalized nutrition and medicine. The Human Variome Project (HVP; http://www.humanvariomeproject.org/) was proposed initially to systematically collect mutations that cause human disease and create a cyber infrastructure to link locus specific databases (LSDB). We report here the discussions and recommendations from the 2008 HVP planning meeting held in San Feliu de Guixols, Spain, in May 2008.
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- 2009
8. Inhaled nitric oxide in full-term and nearly full-term infants with hypoxic respiratory failure
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Stork, E, Gorjanc, E, Verter, J, Younes, N, Stenzel, BA, Powers, T, Sokol, G, Wright, LL, Yaffe, SJ, Catz, C, Rhine, W, Ball, B, Brilli, R, Moles, L, Crowley, M, Backstrom, C, Crouse, D, Hudson, T, Konduri, G, Bara, R, Kleinman, M, Hensman, A, Rothstein, RW, Ehrenkranz, RA, Solimano, A, Germain, F, Walker, R, Ramirez, AM, Singhal, N, Bourcier, L, Fajardo, C, Cook, [No Value], Kirpalani, H, Monkman, S, Johnston, A, Mullahoo, K, Finer, NN, Peliowski, A, Etches, P, Kamstra, B, Sankarhan, K, Riehl, A, Blanchard, P, Gouin, R, Wearden, M, Gomez, M, Moon, Y, Bauer, CR, Donovan, EF, Fanaroff, AA, Korones, SB, Lemons, JA, Oh, W, Papile, LA, Shankaran, S, Stoll, BJ, Tyson, JE, Avery, G, DAlton, M, Bracken, MB, Gleason, CA, Maguire, M, Redmond, C, Silverman, W, Sinclair, J, and University of Groningen
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EXTRACORPOREAL MEMBRANE-OXYGENATION ,HYPERVENTILATION ,MANAGEMENT ,VASODILATOR ,BLEEDING-TIME ,PEROXYNITRITE ,VASOCONSTRICTION ,RELAXING FACTOR ,PERSISTENT PULMONARY-HYPERTENSION ,NEWBORN - Abstract
Background Neonates with pulmonary hypertension have been treated with inhaled nitric oxide because of studies suggesting that it is a selective pulmonary vasodilator. We conducted a randomized, multicenter, controlled trial to determine whether inhaled nitric oxide would reduce mortality or the initiation of extracorporeal membrane oxygenation in infants with hypoxic respiratory failure, Methods Infants born after a gestation of greater than or equal to 34 weeks who were 14 days old or less, had no structural heart disease, and required assisted ventilation and whose oxygenation index was 25 or higher on two measurements were eligible for the study. The infants were randomly assigned to receive nitric oxide at a concentration of 20 ppm or 100 percent oxygen (as a control). Infants whose partial pressure of arterial oxygen (PaO2) increased by 20 mm Hg or less after 30 minutes were studied for a response to 80-ppm nitric oxide or control gas, Results The 121 infants in the control group and the 114 in the nitric oxide group had similar base-line clinical characteristics. Sixty-four percent of the control group and 46 percent of the nitric oxide group died within 120 days or were treated with extracorporeal membrane oxygenation (P=0.006). Seventeen percent of the control group and 14 percent of the nitric oxide group died (P not significant), but significantly fewer in the nitric oxide group received extracorporeal membrane oxygenation (39 percent vs. 54 percent, P=0.014). The nitric oxide group had significantly greater improvement in PaO2 (mean [+/-SD] increase, 58.2+/-85.2 mm Hg, vs. 9.7+/-51.7 mm Hg in the controls; P Conclusions Nitric oxide therapy reduced the use of extracorporeal membrane oxygenation, but had no apparent effect on mortality, in critically ill infants with hypoxic respiratory failure. (C) 1997, Massachusetts Medical Society.
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- 1997
9. Percutaneous fixation of supracondylar fractures of the humerus in children
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Arino, VL, Lluch, EE, Ramirez, AM, Ferrer, J, Rodriguez, L, and Baixauli, F
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- 1977
10. Activation of Vitamin D Signaling Inhibits TGFß–Dependent Fibroproliferation.
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Ramirez, AM, primary, Welch, TH, additional, and Roman, J, additional
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- 2009
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11. Use of #SaludTues Tweetchats for the Dissemination of Culturally Relevant Information on Latino Health Equity: Exploratory Case Study
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Ramirez, Amelie G, Aguilar, Rosalie P, Merck, Amanda, Despres, Cliff, Sukumaran, Pramod, Cantu-Pawlik, Stacy, and Chalela, Patricia
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Public aspects of medicine ,RA1-1270 - Abstract
BackgroundLatinx people comprise 18% of the US adult population and a large share of youth and continue to experience inequities that perpetuate health disparities. To engage Latinx people in advocacy for health equity based on this population’s heavy share of smartphone, social media, and Twitter users, Salud America! launched the #SaludTues Tweetchat series. In this paper, we explore the use of #SaludTues to promote advocacy for Latinx health equity. ObjectiveThis study aims to understand how #SaludTues Tweetchats are used to promote dissemination of culturally relevant information on social determinants of health, to determine whether tweetchats serve to drive web traffic to the Salud America! website, and to understand who participates in #SaludTues Tweetchats and what we can learn about the participants. We also aim to share our own experiences and present a step-by-step guide of how tweetchats are planned, developed, promoted, and executed. MethodsWe explored tweetchat data collected between 2014 and 2018 using Symplur and Google Analytics to identify groups of stakeholders and web traffic. Network analysis and mapping tools were also used to derive insights from this series of chats. ResultsWe conducted 187 chats with 24,609 reported users, 177,466 tweets, and more than 1.87 billion impressions using the hashtag #SaludTues during this span, demonstrating effective dissemination of and exposure to culturally relevant information. Traffic to the Salud America! website was higher on Tuesdays than any other day of the week, suggesting that #SaludTues Tweetchats acted effectively as a website traffic–driving tool. Most participants came from advocacy organizations (165/1000, 16.5%) and other health care–related organizations (162/1000, 16.2%), whereas others were unknown users (147/1000, 14.7%) and individual users outside of the health care sector (117/1000, 11.7%). The majority of participants were located in Texas, California, New York, and Florida, all states with high Latinx populations. ConclusionsCarefully planned, culturally relevant tweetchats such as #SaludTues can be a powerful tool for public health practitioners and advocates to engage audiences on Twitter around health issues, advocacy, and policy solutions for Latino health equity. Further information is needed to determine the effect that #SaludTues Tweetchats have on self- and collective efficacy for advocacy in the area of Latino health equity.
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- 2021
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12. Advancing the Science of Cancer in Latinos
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Ramirez, Amelie G. and Trapido, Edward J.
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Medicine ,Health promotion ,Oncology ,Social structure ,Social inequality ,Cancer research ,Social and ethical issues ,Public health and preventive medicine - Abstract
This open access book gives an overview of the sessions, panel discussions, and outcomes of the Advancing the Science of Cancer in Latinos conference, held in February 2018 in San Antonio, Texas, USA, and hosted by the Mays Cancer Center and the Institute for Health Promotion Research at UT Health San Antonio. Latinos – the largest, youngest, and fastest-growing minority group in the United States – are expected to face a 142% rise in cancer cases in coming years. Although there has been substantial advancement in cancer prevention, screening, diagnosis, and treatment over the past few decades, addressing Latino cancer health disparities has not nearly kept pace with progress. The diverse and dynamic group of speakers and panelists brought together at the Advancing the Science of Cancer in Latinos conference provided in-depth insights as well as progress and actionable goals for Latino-focused basic science research, clinical best practices, community interventions, and what can be done by way of prevention, screening, diagnosis, and treatment of cancer in Latinos. These insights have been translated into the chapters included in this compendium; the chapters summarize the presentations and include current knowledge in the specific topic areas, identified gaps, and top priority areas for future cancer research in Latinos. Topics included among the chapters: Colorectal cancer disparities in Latinos: Genes vs. Environment Breast cancer risk and mortality in women of Latin American origin Differential cancer risk in Latinos: The role of diet Overcoming barriers for Latinos on cancer clinical trials Es tiempo: Engaging Latinas in cervical cancer research Emerging policies in U.S. health care Advancing the Science of Cancer in Latinos proves to be an indispensable resource offering key insights into actionable targets for basic science research, suggestions for clinical best practices and community interventions, and novel strategies and advocacy opportunities to reduce health disparities in Latino communities. It will find an engaged audience among researchers, academics, physicians and other healthcare professionals, patient advocates, students, and others with an interest in the broad field of Latino cancer.
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- 2020
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13. The South Texas Health Status Review: A Health Disparities Roadmap
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Ramirez, Amelie G., Thompson, Ian M., Vela, Leonel, Ramirez, Amelie G., Thompson, Ian M., and Vela, Leonel
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Public Health ,Epidemiology ,Demography ,Manufacturing industries ,Law ,Public health and preventive medicine ,Biochemical engineering - Abstract
Public Health; Epidemiology; Demography
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- 2020
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14. Surgical correction of gastroesophageal reflux in lung transplant patients is associated with decreased effector CD8 cells in lung lavages: a case series.
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Neujahr DC, Mohammed A, Ulukpo O, Force SD, Ramirez AM, Pelaez A, Lawrence EC, Larsen CP, Kirk AD, Neujahr, David C, Mohammed, Aminu, Ulukpo, Onome, Force, Seth D, Ramirez, Allan M, Pelaez, Andres, Lawrence, E Clinton, Larsen, Christian P, and Kirk, Allan D
- Abstract
Background: Lung transplantation is associated with a high incidence of gastroesophageal reflux disease (GERD). The presence of GERD is considered a risk factor for the subsequent development of obliterative bronchiolitis (OB), and surgical correction of GERD by gastric fundoplication (GF) may be associated with increased freedom from OB. The mechanisms underlying a protective effect from OB remain elusive. The objective of this study was to analyze the flow cytometric properties of BAL cells in patients who have undergone GF early after transplant.Methods: In a single-center lung transplant center, eight patients with GERD who were in the first transplant year underwent GF. Prior to and immediately following GF, BAL cells were analyzed by polychromatic flow cytometry. Spirometry was performed before and after GF.Results: GF was associated with a significant reduction in the frequency of BAL CD8 lymphocytes expressing the intracellular effector marker granzyme B, compared with the pre-GF levels. Twenty-six percent of CD8 cells were granzyme Bhi pre-GF compared with 12% of CD8 cells post-GF (range 8%-50% pre-GF, 2%-24% post-GF, P = .01). In contrast, GF was associated with a significant interval increase in the frequency of CD8 cells with an exhausted phenotype (granzyme Blo, CD127lo, PD1hi) from 12% of CD8 cells pre-GF to 24% post-GF (range 1.7%-24% pre-GF and 11%-47% post-GF, P = .05). No significant changes in spirometry were observed during the study interval.Conclusions: Surgical correction of GF is associated with a decreased frequency of potentially injurious effector CD8 cells in the BAL of lung transplant recipients. [ABSTRACT FROM AUTHOR]- Published
- 2010
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15. Clinical, functional, and epidemiological differences between atopic and nonatopic asthmatic children from a tertiary care hospital in a developing country.
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Castro-Rodriguez JA, Ramirez AM, Toche P, Pavon D, Perez MA, Girardi G, and Garcia-Marcos L
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- 2007
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16. The National Cancer Institute’s Community Networks Program Initiative to Reduce Cancer Health Disparities: Outcomes and Lessons Learned
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Braun, Kathryn L., Stewart, Susan, Baquet, Claudia, Berry-Bobovski, Lisa, Blumenthal, Daniel, Brandt, Heather M., Buchwald, Dedra S., Campbell, Janis E., Coe, Kathryn, Cooper, Leslie C., Espinoza, Paula, Henry-Tillman, Ronda, Hargreaves, Margaret, James, Aimee, Salmon Kaur, Judith, Viswanath, K., Ma, Grace X., Mandelblatt, Jeanne, Meade, Cathy, Ramirez, Amelie, Scarinci, Isabel, Park Tanjasiri, Sora, Thompson, Beti, Vines, Anissa I., and Dignan, Mark
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- 2015
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17. Cancer Patient Navigator Tasks across the Cancer Care Continuum
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Braun, Kathryn L., Kagawa-Singer, Marjorie, Holden, Alan E.C., Burhansstipanov, Linda, Tran, Jacqueline H., Seals, Brenda F., Corbie-Smith, Giselle, Tsark, JoAnn U., Harjo, Lisa, Foo, Mary Anne, and Ramirez, Amelie G.
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- 2012
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18. Influenza pneumonia in thoracic organ transplant recipients : what can we do to avoid it?
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Massad MG, Ramirez AM, Massad, M G, and Ramirez, A M
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- 2001
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19. Tiempo y vida cotidiana. La mujeres come sujetos de innovación cultural
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Leccardi, C, Cárdenas Tomažič, A, Yévenes Ramirez, AM, and Leccardi, C
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SPS/08 - SOCIOLOGIA DEI PROCESSI CULTURALI E COMUNICATIVI ,Soggettività, tempo, genere, innovazione sociale - Published
- 2018
20. Comparing Alzheimer's genes in African, European, and Amerindian induced pluripotent stem cell-derived microglia.
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Moura S, Nasciben LB, Ramirez AM, Coombs L, Rivero J, Van Booven DJ, DeRosa BA, Hamilton-Nelson KL, Whitehead PL, Adams LD, Starks TD, Mena PR, Illanes-Manrique M, Tejada S, Byrd GS, Cornejo-Olivas MR, Feliciano-Astacio BE, Nuytemans K, Wang L, Pericak-Vance MA, Dykxhoorn DM, Rajabli F, Griswold AJ, Young JI, and Vance JM
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- Humans, Genome-Wide Association Study, Male, Female, Microglia metabolism, Alzheimer Disease genetics, Induced Pluripotent Stem Cells, White People genetics, Black People genetics
- Abstract
Introduction: Genome-wide association studies (GWAS) studies in Alzheimer's disease (AD) demonstrate ancestry-specific loci. Previous studies in the regulatory architecture have only been conducted in Europeans (EUs), thus studies in additional ancestries are needed. Given the prevalence of AD genes expressed in microglia, we initiated our studies in induced pluripotent stem cell (iPSC) -derived microglia., Methods: We created iPSC-derived microglia from 13 individuals of either high Amerindian (AI), African (AF), or EU global ancestry, including both AD and controls. RNA-seq, ATAC-seq, and pathway analyses were compared between ancestries in both AD and non-AD genes., Results: Twelve AD genes were differentially expressed genes (DEGs) and/or accessible between ancestries, including ABI3, CTSB, and MS4A6A. A total of 5% of all genes had differential ancestral expression, but differences in accessibility were less than 1%. The DEGs were enriched in known AD pathways., Discussion: This resource will be valuable in evaluating AD in admixed populations and other neurological disorders and understanding the AD risk differences between populations., Highlights: First comparison of the genomics of AI, AF, and EU microglia. Report differences in expression and accessibility of AD genes between ancestries. Ancestral expression differences are greater than differences in accessibility. Good transcriptome correlation was seen between brain and iPSC-derived microglia. Differentially expressed AD genes were in known AD pathways., (© 2025 The Author(s). Alzheimer's & Dementia published by Wiley Periodicals LLC on behalf of Alzheimer's Association.)
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- 2025
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21. Ancestral Genomic Functional Differences in Oligodendroglia: Implications for Alzheimer's Disease.
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Ramirez AM, Bertholim-Nasciben L, Moura S, Coombs LE, Rajabli F, DeRosa BA, Whitehead PG, Adams LD, Starks TD, Mena P, Illannes-Manrique M, Tejada SJ, Byrd GS, Caban-Holt A, Cuccaro M, McInerney K, Cornejo-Olivas M, Feliciano-Astacio B, Wang L, Robayo MC, Xu W, Jin F, Pericak-Vance MA, Griswold AJ, Dykxhoorn DM, Young JI, and Vance JM
- Abstract
Background: This study aims to elucidate ancestry-specific changes to the genomic regulatory architecture in induced pluripotent stem cell (iPSC)-derived oligodendroglia, focusing on their implications for Alzheimer's disease (AD). This work addresses the lack of diversity in previous iPSC studies by including ancestries that contribute to African American (European/African) and Hispanic/Latino populations (Amerindian/African/European)., Methods: We generated 12 iPSC lines-four African, four Amerindian, and four European- from both AD patients and non-cognitively impaired individuals, with varying APOE genotypes ( APOE3/3 and APOE4/4 ). These lines were differentiated into neural spheroids containing oligodendrocyte lineage cells. Single-nuclei RNA sequencing and ATAC sequencing were employed to analyze transcriptional and chromatin accessibility profiles, respectively. Differential gene expression, chromatin accessibility, and Hi-C analyses were conducted, followed by pathway analysis to interpret the results., Results: We identified ancestry-specific differences in gene expression and chromatin accessibility. Notably, numerous AD GWAS-associated genes were differentially expressed across ancestries. The largest number of differentially expressed genes (DEGs) were found in European vs. Amerindian and African vs. Amerindian iPSC-derived oligodendrocyte progenitor cells (OPCs). Pathway analysis of APOE4/4 carriers vs APOE3/3 carriers exhibited upregulation of a large number of disease and metabolic pathways in APOE4/4 individuals of all ancestries. Of particular interest was that APOE4/4 carriers had significantly upregulated cholesterol biosynthesis genes relative to APOE3/3 individuals across all ancestries, strongest in iOPCs. Comparison of iOPC and iOL transcriptome data with corresponding human frontal cortex data demonstrated a high correlation (R
2 > 0.85)., Conclusions: This research emphasizes the importance of including diverse ancestries in AD research to uncover critical gene expression differences between populations and ancestries that may influence disease susceptibility and therapeutic interventions. The upregulation of cholesterol biosynthesis genes in APOE4/4 carriers of all three ancestries supports the concept that APOE4 may produce disease effects early in life, which could have therapeutic implications as we move forward towards specific therapy for APOE4 carriers. These findings and the high correlation between brain and iPSC-derived OPC and OL transcriptomes support the relevance of this approach as a model for disease study., Competing Interests: Competing interests The authors declare that they have no competing interests.- Published
- 2024
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22. African origin haplotype protective for Alzheimer's disease in APOE ε4 carriers: exploring potential mechanisms.
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Bertholim-Nasciben L, Nuytemans K, Van Booven D, Rajabli F, Moura S, Ramirez AM, Dykxhoorn DM, Wang L, Scott WK, Davis DA, Vontell RT, McInerney KF, Cuccaro ML, Byrd GS, Haines JL, Gearing M, Adams LD, Pericak-Vance MA, Young JI, Griswold AJ, and Vance JM
- Abstract
APOE ε4 is the strongest genetic risk factor for Alzheimer's disease (AD) with approximately 50% of AD patients carrying at least one APOE ε4 allele. Our group identified a protective interaction between APOE ε4 with the African-specific A allele of rs10423769, which reduces the AD risk effect of APOE ε4 homozygotes by approximately 75%. The protective variant lies 2Mb from APOE in a region of segmental duplications (SD) of chromosome 19 containing a cluster of pregnancy specific beta-1 glycoprotein genes ( PSGs ) and a long non-coding RNA. Using both short and long read sequencing, we demonstrate that rs10423769_A allele lies within a unique single haplotype inside this region of segmental duplication. We identified the protective haplotype in all African ancestry populations studied, including both West and East Africans, suggesting the variant has an old origin. Long-read sequencing identified both structural and DNA methylation differences between the protective rs10423769_A allele and non-protective haplotypes. An expanded variable number tandem repeat (VNTR) containing multiple MEF2 family transcription factor binding motifs was found associated with the protective haplotype (p-value = 2.9e-10). These findings provide novel insights into the mechanisms of this African-origin protective variant for AD in APOE ε4 carriers and supports the importance of including all ancestries in AD research., Competing Interests: Declaration of interests The authors declare no competing interests.
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- 2024
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23. Beyond Trial Counts: Considerations for Measuring Play and Engagement During Early Intervention for Autistic Children.
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Raulston TJ, Ousley CL, Hinton EM, and Ramirez AM
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Play is critical to child development. In early childhood, object play evolves from exploratory behavior to complex symbolic play. Engagement during play, particularly joint engagement, is essential for learning and social interaction. Board Certified Behavior Analysts® (BCBAs) who provide early intervention services to young autistic children may experience barriers when designing programming and data collection systems for play and engagement. In this paper, we compare Naturalistic Developmental Behavioral Intervention (NDBI) and Natural Environment Teaching (NET) approaches. Considerations for measuring object play and engagement during naturalistic play routines are presented. We encourage BCBAs to consider simple frequency counts when measuring object play actions and interval recording or rating scales for tracking engagement states. These methods may better accommodate the variability in play and engagement behavior, allow for more flexible play routines, and support a more nuanced analysis of child progress., Competing Interests: Conflict of interestThe authors report no potential conflicts of interest., (© Association for Behavior Analysis International 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.)
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- 2024
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24. Trends in management of patients with new-onset refractory status epilepticus (NORSE) from 2016 to 2023: An interim analysis.
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Hanin A, Jimenez AD, Gopaul M, Asbell H, Aydemir S, Basha MM, Batra A, Damien C, Day GS, Eka O, Eschbach K, Fatima S, Fields MC, Foreman B, Gerard EE, Gofton TE, Haider HA, Hantus ST, Hocker S, Jongeling A, Kalkach Aparicio M, Kandula P, Kang P, Kazazian K, Kellogg MA, Kim M, Lee JW, Marcuse LV, McGraw CM, Mohamed W, Orozco J, Pimentel CM, Punia V, Ramirez AM, Steriade C, Struck AF, Taraschenko O, Treister AK, Wainwright MS, Yoo JY, Zafar S, Zhou DJ, Zutshi D, Gaspard N, and Hirsch LJ
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- Humans, Male, Female, Adolescent, Adult, Drug Resistant Epilepsy therapy, Drug Resistant Epilepsy diet therapy, Child, Antibodies, Monoclonal, Humanized therapeutic use, Middle Aged, Child, Preschool, Anticonvulsants therapeutic use, Young Adult, Rituximab therapeutic use, Disease Management, Status Epilepticus therapy, Status Epilepticus drug therapy, Diet, Ketogenic methods, Immunotherapy methods, Immunotherapy trends
- Abstract
In response to the evolving treatment landscape for new-onset refractory status epilepticus (NORSE) and the publication of consensus recommendations in 2022, we conducted a comparative analysis of NORSE management over time. Seventy-seven patients were enrolled by 32 centers, from July 2016 to August 2023, in the NORSE/FIRES biorepository at Yale. Immunotherapy was administered to 88% of patients after a median of 3 days, with 52% receiving second-line immunotherapy after a median of 12 days (anakinra 29%, rituximab 25%, and tocilizumab 19%). There was an increase in the use of second-line immunotherapies (odds ratio [OR] = 1.4, 95% CI = 1.1-1.8) and ketogenic diet (OR = 1.8, 95% CI = 1.3-2.6) over time. Specifically, patients from 2022 to 2023 more frequently received second-line immunotherapy (69% vs 40%; OR = 3.3; 95% CI = 1.3-8.9)-particularly anakinra (50% vs 13%; OR = 6.5; 95% CI = 2.3-21.0), and the ketogenic diet (OR = 6.8; 95% CI = 2.5-20.1)-than those before 2022. Among the 27 patients who received anakinra and/or tocilizumab, earlier administration after status epilepticus onset correlated with a shorter duration of status epilepticus (ρ = .519, p = .005). Our findings indicate an evolution in NORSE management, emphasizing the increasing use of second-line immunotherapies and the ketogenic diet. Future research will clarify the impact of these treatments and their timing on patient outcomes., (© 2024 International League Against Epilepsy.)
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- 2024
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25. Comparative analysis of patients with new onset refractory status epilepticus preceded by fever (febrile infection-related epilepsy syndrome) versus without prior fever: An interim analysis.
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Jimenez AD, Gopaul M, Asbell H, Aydemir S, Basha MM, Batra A, Damien C, Day GS, Eka O, Eschbach K, Fatima S, Fields MC, Foreman B, Gerard EE, Gofton TE, Haider HA, Hantus ST, Hocker S, Jongeling A, Kalkach Aparicio M, Kandula P, Kang P, Kazazian K, Kellogg MA, Kim M, Lee JW, Marcuse LV, McGraw CM, Mohamed W, Orozco J, Pimentel C, Punia V, Ramirez AM, Steriade C, Struck AF, Taraschenko O, Treister AK, Yoo JY, Zafar S, Zhou DJ, Zutshi D, Gaspard N, Hirsch LJ, and Hanin A
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- Humans, Male, Female, Adult, Middle Aged, Young Adult, Adolescent, Drug Resistant Epilepsy etiology, Child, Seizures, Febrile etiology, Electroencephalography, Aged, Magnetic Resonance Imaging, Epileptic Syndromes, Child, Preschool, Status Epilepticus etiology, Fever etiology, Fever complications
- Abstract
Febrile infection-related epilepsy syndrome (FIRES) is a subset of new onset refractory status epilepticus (NORSE) that involves a febrile infection prior to the onset of the refractory status epilepticus. It is unclear whether FIRES and non-FIRES NORSE are distinct conditions. Here, we compare 34 patients with FIRES to 30 patients with non-FIRES NORSE for demographics, clinical features, neuroimaging, and outcomes. Because patients with FIRES were younger than patients with non-FIRES NORSE (median = 28 vs. 48 years old, p = .048) and more likely cryptogenic (odds ratio = 6.89), we next ran a regression analysis using age or etiology as a covariate. Respiratory and gastrointestinal prodromes occurred more frequently in FIRES patients, but no difference was found for non-infection-related prodromes. Status epilepticus subtype, cerebrospinal fluid (CSF) and magnetic resonance imaging findings, and outcomes were similar. However, FIRES cases were more frequently cryptogenic; had higher CSF interleukin 6, CSF macrophage inflammatory protein-1 alpha (MIP-1a), and serum chemokine ligand 2 (CCL2) levels; and received more antiseizure medications and immunotherapy. After controlling for age or etiology, no differences were observed in presenting symptoms and signs or inflammatory biomarkers, suggesting that FIRES and non-FIRES NORSE are very similar conditions., (© 2024 International League Against Epilepsy.)
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- 2024
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26. Clients' expectations and experiences with providers of menstrual regulation: a qualitative study in Bangladesh.
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Ramirez AM, Tabassum T, Filippa S, Katz A, Chowdhury R, Bercu C, and Baum SE
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- Humans, Female, Bangladesh, Adult, Young Adult, Pregnancy, Menstruation psychology, Health Knowledge, Attitudes, Practice, Abortion, Induced psychology, Adolescent, Qualitative Research
- Abstract
Background: Menstrual Regulation (MR) has been legal in Bangladesh since 1979 in an effort to reduce maternal mortality from unsafe abortion care. However, access to high-quality and patient-centered MR care remains a challenge. This analysis aimed to explore what clients know before going into care and the experience itself across a variety of service delivery sites where MR care is available., Methods: We conducted 26 qualitative semi-structured interviews with MR clients who were recruited from three different service delivery sites in Dhaka, Bangladesh from January to March 2019. Interviews explored client expectations and beliefs about MR care, the experience of the care they received, and their perception of the quality of that care. We conducted a thematic content analysis using a priori and emergent codes., Results: Clients overall lacked knowledge about MR care and held fears about the damage to their bodies after receiving care. Despite their fears, roughly half the clients held positive expectations about the care they would receive. Call center clients felt the most prepared by their provider about what to expect during their MR care. During counseling sessions, providers at in-facility locations reinforced the perception of risk of future fertility as a result of MR and commonly questioned clients on their need for MR services. Some even attempted to dissuade nulliparous women from getting the care. Clients received this type of questioning throughout their time at the facilities, not just from their medical providers. The majority of clients perceived their care as good and rationalized these comments from their providers as coming from a caring place. However, a handful of clients did report bad care and negative feelings about their interactions with providers and other clinical staff., Conclusion: Providers and clinical staff can play a key role in shaping the experience of clients accessing MR care. Training on accurate knowledge about the safety and effectiveness of MR, and the importance of client communication could help improve client knowledge and person-centered quality of MR care., (© 2024. The Author(s).)
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- 2024
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27. Impact of elexacaftor/tezacaftor/ivacaftor on respiratory colonization in an adult cystic fibrosis clinic.
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Szabo MM, Foushee SE, McPheeters CM, O'Hagan AR, Ramirez AM, and O'Reilly EA
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- Adult, Humans, Adolescent, Expectorants, Retrospective Studies, Mutation, Cystic Fibrosis drug therapy, Benzodioxoles, Indoles, Aminophenols, Pyrazoles, Pyridines, Pyrrolidines, Quinolones
- Abstract
Background: Little research has been completed on the correlation between cystic fibrosis (CF) modulator therapy and its effect on respiratory cultures in CF patients. This study evaluated the effect of elexacaftor/tezacaftor/ivacaftor (ETI) on respiratory colonization with Pseudomonas aeruginosa., Methods: This single center, IRB approved, retrospective chart review compared patient data two years immediately prior to ETI initiation with patient data two years post-initiation from January 2017-December 2022. Patients were included in the study if they were at least 18 years old with a diagnosis of CF and had at least one month of ETI dispensed, at least one sputum culture obtained, and were currently on ETI. Those who had not been seen since ETI initiation or received a bilateral lung transplant were excluded. The primary outcome was rate of patients with respiratory colonization post-ETI. Colonization was defined as two or more positive P. aeruginosa cultures in a 12-month period. Decolonization was defined as three consecutive negative P. aeruginosa cultures after previous colonization. Key secondary outcomes included average time to discontinuation of mucolytic therapy and relative risk of pulmonary exacerbation., Results: A significant reduction (p<0.001) in colonization with P. aeruginosa was observed with 49 patients in the pre-ETI group compared to 25 in the post-ETI group meeting the definition of colonization (n=79). Average time to discontinuation of mucolytic therapy was 14 months (p=0.002). Relative risk of pulmonary exacerbation was 4.80 (p<0.001)., Conclusions: ETI use resulted in reduced colonization with P. aeruginosa, discontinuation of mucolytic therapy, and decreased frequency of pulmonary exacerbation., Competing Interests: Declaration of competing interest Authors have no conflict of interest specifically related to this manuscript., (Copyright © 2024 Southern Society for Clinical Investigation. Published by Elsevier Inc. All rights reserved.)
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- 2024
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28. Social determinants of health correlations and resource usefulness at a Milwaukee free clinic for uninsured individuals: A cross-sectional study.
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Miller J, Doucas A, Karra H, Thareja SK, Bowie O, Dong X, Terrell J, Hernandez S, Corujo-Ramirez AM, Xia N, Qi S, Huang CC, Lundh R, and Young SA
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Introduction: Addressing social determinants of health (SDOH) is fundamental to improving health outcomes. At a student-run free clinic, we developed a screening process to understand the SDOH needs and resource utilization of Milwaukee's uninsured population., Methods: In this cross-sectional study, we screened adult patients without health insurance ( N = 238) for nine traditional SDOH needs as well as their access to dental and mental health care between October 2021 and October 2022. Patients were surveyed at intervals greater than or equal to 30 days. We assessed correlations between SDOH needs and trends in patient-reported resource usefulness., Results: Access to dental care (64.7%) and health insurance (51.3%) were the most frequently endorsed needs. We found significant correlations ( P ≤ 0.05) between various SDOH needs. Notably, mental health access needs significantly correlated with dental ( r = 0.41; 95% CI = 0.19, 0.63), medications ( r = 0.51; 95% CI = 0.30, 0.72), utilities ( r = 0.39; 95% CI = 0.17, 0.61), and food insecurity ( r = 0.42; 95% CI = 0.19, 0.64). Food-housing ( r = 0.55; 95% CI = 0.32, 0.78), housing-medications ( r = 0.58; 95% CI = 0.35, 0.81), and medications-food ( r = 0.53; 95% CI = 0.32, 0.74) were significantly correlated with each other. Longitudinal assessment of patient-reported usefulness informed changes in the resources offered., Conclusions: Understanding prominent SDOH needs can inform resource offerings and interventions, addressing root causes that burden under-resourced patients. In this study, patient-reported data about resource usefulness prompted the curation of new resources and volunteer roles. This proof-of-concept study shows how longitudinally tracking SDOH needs at low-resource clinics can inform psychosocial resources., Competing Interests: The authors of this manuscript affirm that there are no conflicts of interest to disclose regarding the content of this work. We have no financial, personal, or professional relationships with individuals or organizations that could inappropriately influence or bias our research., (© The Author(s) 2024.)
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- 2024
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29. Increased production of aureolysin and staphopain A is a primary determinant of the reduced virulence of Staphylococcus aureus sarA mutants in osteomyelitis.
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Campbell MJ, Beenken KE, Ramirez AM, and Smeltzer MS
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- Animals, Mice, Humans, Staphylococcus aureus metabolism, Virulence genetics, Disease Models, Animal, Methicillin metabolism, Virulence Factors genetics, Virulence Factors metabolism, Bacterial Proteins metabolism, Peptide Hydrolases metabolism, Biofilms, Gene Expression Regulation, Bacterial, Mammals metabolism, Osteomyelitis, Staphylococcal Infections, Metalloendopeptidases
- Abstract
We previously demonstrated that mutation of sarA in Staphylococcus aureus limits biofilm formation, cytotoxicity for osteoblasts and osteoclasts, and virulence in osteomyelitis, and that all of these phenotypes can be attributed to the increased production of extracellular proteases. Here we extend these studies to assess the individual importance of these proteases alone and in combination with each other using the methicillin-resistant USA300 strain LAC, the methicillin-susceptible USA200 strain UAMS-1, and isogenic sarA mutants that were also unable to produce aureolysin (Aur), staphopain A (ScpA), staphylococcal serine protease A (subsp.), staphopain B (SspB), and the staphylococcal serine protease-like proteins A-F (SplA-F). Biofilm formation was restored in LAC and UAMS-1 sarA mutants by subsequent mutation of aur and scpA , while mutation of aur had the greatest impact on cytotoxicity to mammalian cells, particularly with conditioned medium (CM) from the more cytotoxic strain LAC. However, SDS-PAGE and western blot analysis of CM confirmed that mutation of sspAB was also required to mimic the phenotype of sarA mutants unable to produce any extracellular proteases. Nevertheless, in a murine model of post-traumatic osteomyelitis, mutation of aur and scpA had the greatest impact on restoring the virulence of LAC and UAMS-1 sarA mutants, with concurrent mutation of sspAB and the spl operon having relatively little effect. These results demonstrate that the increased production of Aur and ScpA in combination with each other is a primary determinant of the reduced virulence of S. aureus sarA mutants in diverse clinical isolates including both methicillin-resistant and methicillin-susceptible strains.IMPORTANCEPrevious work established that SarA plays a primary role in limiting the production of extracellular proteases to prevent them from limiting the abundance of S. aureus virulence factors. Eliminating the production of all 10 extracellular proteases in the methicillin-resistant strain LAC has also been shown to enhance virulence in a murine sepsis model, and this has been attributed to the specific proteases Aur and ScpA. The importance of this work lies in our demonstration that the increased production of these same proteases largely accounts for the decreased virulence of sarA mutants in a murine model of post-traumatic osteomyelitis not only in LAC but also in the methicillin-susceptible human osteomyelitis isolate UAMS-1. This confirms that sarA -mediated repression of Aur and ScpA production plays a critical role in the posttranslational regulation of S. aureus virulence factors in diverse clinical isolates and diverse forms of S. aureus infection., Competing Interests: The authors declare no conflict of interest.
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- 2024
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30. Dose-Related Side Effects of Intravitreal Injections of Humanized Anti-Vascular Endothelial Growth Factor in Rats: Glial Cell Reactivity and Retinal Ganglion Cell Loss.
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Martínez-Vacas A, Di Pierdomenico J, Gómez-Ramirez AM, Vidal-Sanz M, Villegas-Pérez MP, and García-Ayuso D
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- Humans, Rats, Animals, Intravitreal Injections, Ranibizumab toxicity, Vascular Endothelial Growth Factor A, Rats, Sprague-Dawley, Goats, Neuroglia, Retinal Ganglion Cells, Endothelial Growth Factors
- Abstract
Purpose: In a previous study, we documented that the Intravitreal injections (IVIs) of bevacizumab in rats caused a retinal inflammatory response. We now study whether the IVI of other humanized anti-VEGF: ranibizumab and aflibercept also cause an inflammatory reaction in the rat retina and if it depends on the dose administered. Finally, we study whether this reaction affects retinal ganglion cell (RGC) survival., Methods: Albino Sprague-Dawley rats received a single IVI of 5 µL of PBS or ranibizumab or aflibercept at the concentration used in clinical practice (10 µg/µL or 40 µg/µL) or at a lower concentration (0.38 µg/µL and 1.5 µg/µL) calculated to obtain within the rat eye the same concentration as in the human eye in clinical practice. Others received a single 5 µL IVI of a polyclonal goat anti-rat VEGF (0.015 µg/µL) or of vehicle (PBS). Animals were processed 7 days or 1 month later. Retinal whole mounts were immunolabeled for the detection of microglial, macroglial, RGCs, and intrinsically photosensitive RGCs (ipRGCs). Fluorescence and confocal microscopy were used to examine retinal changes, and RGCs and ipRGCs were quantified automatically or semiautomatically, respectively., Results: All the injected substances including the PBS induced detectable side effects, namely, retinal microglial cell activation and retinal astrocyte hypertrophy. However, there was a greater microglial and macroglial response when the higher concentrations of ranibizumab and aflibercept were injected than when PBS, the antibody anti-rat VEGF and the lower concentrations of ranibizumab or aflibercept were injected. The higher concentration of ranibizumab and aflibercept resulted also in significant RGC death, but did not cause appreciable ipRGC death., Conclusions: The IVI of all the substances had some retinal inflammatory effects. The IVI of humanized anti-VEGF to rats at high doses cause important side effects: severe inflammation and RGC death, but not ipRGC death.
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- 2024
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31. Evolución urbano arquitectónica de la ciudad de Guatemala, 1776-1976
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Ramírez, América Alonso, Fuentes, Cecilia Zurita, Ramírez, América Alonso, and Fuentes, Cecilia Zurita
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- 2021
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32. Educación comunitaria : Los inicios de una tradición
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Ramírez, Amadeo Clavijo, Morales, Alcira Aguilera, Carrillo, Alfonso Torres, Poveda, Ingrid Katherine Viasús, Osorio, Mario Sequeda, Murcia, Víctor Manuel Rodríguez, Ramírez, Amadeo Clavijo, Morales, Alcira Aguilera, Carrillo, Alfonso Torres, Poveda, Ingrid Katherine Viasús, Osorio, Mario Sequeda, and Murcia, Víctor Manuel Rodríguez
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- 2021
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33. The major role of sarA in limiting Staphylococcus aureus extracellular protease production in vitro is correlated with decreased virulence in diverse clinical isolates in osteomyelitis.
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Campbell MJ, Beenken KE, Ramirez AM, and Smeltzer MS
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- Animals, Humans, Mice, Virulence, Staphylococcus aureus, Bacterial Proteins genetics, Bacterial Proteins metabolism, Endopeptidases genetics, Gene Expression Regulation, Bacterial, Biofilms, Mutation, Peptide Hydrolases genetics, Peptide Hydrolases metabolism, Osteomyelitis
- Abstract
We previously demonstrated that MgrA, SarA, SarR, SarS, SarZ, and Rot bind at least three of the four promoters associated with genes encoding primary extracellular proteases in Staphylococcus aureus (Aur, ScpA, SspA/SspB, SplA-F). We also showed that mutation of sarA results in a greater increase in protease production, and decrease in biofilm formation, than mutation of the loci encoding any of these other proteins. However, these conclusions were based on in vitro studies. Thus, the goal of the experiments reported here was to determine the relative impact of the regulatory loci encoding these proteins in vivo . To this end, we compared the virulence of mgrA , sarA , sarR , sarS , sarZ , and rot mutants in a murine osteomyelitis model. Mutants were generated in the methicillin-resistant USA300 strain LAC and the methicillin-sensitive USA200 strain UAMS-1, which was isolated directly from the bone of an osteomyelitis patient during surgical debridement. Mutation of mgrA and rot limited virulence to a statistically significant extent in UAMS-1, but not in LAC, while the sarA mutant exhibited reduced virulence in both strains. The reduced virulence of the sarA mutant was correlated with reduced cytotoxicity for osteoblasts and osteoclasts, reduced biofilm formation, and reduced sensitivity to the antimicrobial peptide indolicidin, all of which were directly attributable to increased protease production in both LAC and UAMS-1. These results illustrate the importance of considering diverse clinical isolates when evaluating the impact of regulatory mutations on virulence and demonstrate the significance of SarA in limiting protease production in vivo in S. aureus .
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- 2023
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34. Quality of care from the perspective of people obtaining abortion: a qualitative study in four countries.
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Baum SE, Jacobson L, Ramirez AM, Katz A, Grosso B, Bercu C, Pearson E, Gebrehanna E, Chakraborty NM, Dirisu O, Chowdhury R, Zurbriggen R, Filippa S, Tabassum T, and Gerdts C
- Subjects
- Female, Pregnancy, Humans, Qualitative Research, Argentina, Bangladesh, Quality of Health Care, Abortion, Induced
- Abstract
Objective: This qualitative study aimed to identify person-centred domains that would contribute to the definition and measurement of abortion quality of care based on the perceptions, experiences and priorities of people seeking abortion., Methods: We conducted interviews with people seeking abortion aged 15-41 who obtained care in Argentina, Bangladesh, Ethiopia or Nigeria. Participants were recruited from hospitals, clinics, pharmacies, call centres and accompaniment models. We conducted thematic analysis and quantified key domains of quality identified by the participants., Results: We identified six themes that contributed to high-quality abortion care from the clients' perspective, with particular focus on interpersonal dynamics. These themes emerged as participants described their abortion experience, reflected on their interactions with providers and defined good and bad care. The six themes included (1) kindness and respect, (2) information exchange, (3) emotional support, (4) attentive care throughout the process, (5) privacy and confidentiality and (6) prepared for and able to cope with pain., Conclusions: People seeking abortion across multiple country contexts and among various care models have confirmed the importance of interpersonal care in quality. These findings provide guidance on six priority areas which could be used to sharpen the definition of abortion quality, improve measurement, and design interventions to improve quality., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2023. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.)
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- 2023
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35. Video Intervention and Goals-of-Care Documentation in Hospitalized Older Adults: The VIDEO-PCE Randomized Clinical Trial.
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Volandes AE, Zupanc SN, Lakin JR, Cabral HJ, Burns EA, Carney MT, Lopez S, Itty J, Emmert K, Martin NJ, Cole T, Dobie A, Cucinotta T, Joel M, Caruso LB, Henault L, Dugas JN, Astone K, Winter M, Wang N, Davis AD, Garde C, Rodriguez PM, El-Jawahri A, Moseley ET, Das S, Sciacca K, Ramirez AM, Gromova V, Lambert S, Sanghani S, Lindvall C, and Paasche-Orlow MK
- Subjects
- Humans, Male, Aged, Female, Goals, Communication, Documentation, Palliative Care, Alzheimer Disease
- Abstract
Importance: Despite the benefits of goals-of-care (GOC) communication, many hospitalized individuals never communicate their goals or preferences to clinicians., Objective: To assess whether a GOC video intervention delivered by palliative care educators (PCEs) increased the rate of GOC documentation., Design, Setting, and Participants: This pragmatic, stepped-wedge cluster randomized clinical trial included patients aged 65 years or older admitted to 1 of 14 units at 2 urban hospitals in New York and Boston from July 1, 2021, to October 31, 2022., Intervention: The intervention involved PCEs (social workers and nurses trained in GOC communication) facilitating GOC conversations with patients and/or their decision-makers using a library of brief, certified video decision aids available in 29 languages. Patients in the control period received usual care., Main Outcome and Measures: The primary outcome was GOC documentation, which included any documentation of a goals conversation, limitation of life-sustaining treatment, palliative care, hospice, or time-limited trials and was obtained by natural language processing., Results: A total of 10 802 patients (mean [SD] age, 78 [8] years; 51.6% male) were admitted to 1 of 14 hospital units. Goals-of-care documentation during the intervention phase occurred among 3744 of 6023 patients (62.2%) compared with 2396 of 4779 patients (50.1%) in the usual care phase (P < .001). Proportions of documented GOC discussions for Black or African American individuals (865 of 1376 [62.9%] vs 596 of 1125 [53.0%]), Hispanic or Latino individuals (311 of 548 [56.8%] vs 218 of 451 [48.3%]), non-English speakers (586 of 1059 [55.3%] vs 405 of 863 [46.9%]), and people living with Alzheimer disease and related dementias (520 of 681 [76.4%] vs 355 of 570 [62.3%]) were greater during the intervention phase compared with the usual care phase., Conclusions and Relevance: In this stepped-wedge cluster randomized clinical trial of older adults, a GOC video intervention delivered by PCEs resulted in higher rates of GOC documentation compared with usual care, including among Black or African American individuals, Hispanic or Latino individuals, non-English speakers, and people living with Alzheimer disease and related dementias. The findings suggest that this form of patient-centered care delivery may be a beneficial decision support tool., Trial Registration: ClinicalTrials.gov Identifier: NCT04857060.
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- 2023
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36. Complete Chloroplast Genome Sequence of the Western Poison Oak, Toxicodendron diversilobum (Anacardiaceae), from California.
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Huitron Vazquez LI, Aviles PE, Bailon SA, Cabanillas AG, Fernandez A, Galarza JI, Guerrero B, Hernandez AB, Hernandez D, Jarrett K, Li T, Maravillo FJ, Moreno M, Perez A, Rosales NA, Ruegg HF, Valdez J, Bravo KM, Chávez VL, Diaz DI, Enriquez D, Martinez EL, Mendoza Padilla J, Meza J, Nelson SV, Quintero-Ahumada C, Ramirez AM, and Hughey JR
- Abstract
Here, we present the complete chloroplast genome sequence of Toxicodendron diversilobum, western poison oak, from Pacific Grove, California. The genome is 159,543 bp in length, contains 133 genes, and has a high level of gene synteny to other species of Toxicodendron .
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- 2023
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37. Mental Well-being InSciEd Out: Health Partnerships with the Boys & Girls Clubs of Puerto Rico.
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Yowler JY, Corujo Ramirez AM, Roche-Miranda MI, Alvarado J, Sauri YA, Calderon Lopez RA, Heeren AA, Mays MH, Mundy D, Ortiz W, Weavers K, Yusuf N, Martinez Gonzalez KG, Campos Rivera M, and Pierret C
- Subjects
- Male, Female, Adolescent, Humans, Puerto Rico, Psychological Well-Being, Health Status, Mental Health, Community-Based Participatory Research
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Background: Mental health care is a top clinical concern for modern Puerto Rico, especially given a dramatically changing economic landscape paired with recurrent natural disasters. Youth are particularly at-risk due to long-term impacts of toxic stress and adverse childhood experiences on health and development., Objectives: Here we present a novel clinician-community-educator-scientist partnership to address Puerto Rican youth mental well-being and wellness. We deployed pilot health workshops within the Boys & Girls Clubs of Puerto Rico to build youth mental health conceptual understanding and competencies in stress recognition and management. The work in progress herein evaluates acceptability and feasibility of our curricular model., Methods: Dialogue with community stakeholders guided curricular design of workshops for youth ages 6 to 13 and older. Prior to implementation, educators and volunteers attended a 1-day training on educational strategies. Workshop success was evaluated using qualitative approaches (i.e., narrative feedback, educator and volunteer reflections, youth Talking Drawings) to assess youth engagement, youth conceptual health understanding, and educator/volunteer impressions of feasibility and impact., Results: Initial findings indicate high acceptability and feasibility of our curricular model. Youth engagement and enthusiasm were noted in educator feedback and continue to be sustained post-workshop. Preliminary analysis shows accompanying increases in youth conceptual mental health understanding, particularly for 6- to 12-year-olds in recognition of stress and healthy coping mechanisms. Reciprocal gains were observed for volunteers., Conclusions: Activities have evolved into a formal partnership called Semilla, which features expanded analysis of mental well-being and wellness outcomes. Our collaborative model continues to engage Puerto Rican youth in the science of their well-being.
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- 2023
38. "I was afraid they will be judging me and even deny me the service": Experiences of denial and dissuasion during abortion care in Ethiopia.
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Bercu C, Jacobson LE, Gebrehanna E, Ramirez AM, Katz AJ, Filippa S, and Baum SE
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Introduction: Disrespect and abuse are components of poor quality abortion care. This analysis aimed to understand negative experiences of care from perspectives of abortion clients in public and private facilities in Ethiopia., Study Design: We conducted 23 in-depth interviews with people who obtained abortion care in Addis Ababa, Ethiopia as well as Aksum and Mekele in Tigray State, Ethiopia. The interviews were coded using a priori and emergent codes and we conducted thematic analysis to understand negative interactions with providers from participant's perspectives., Results: Participants experienced denial of abortion services along their pathway to care and attempts by providers to dissuade them prior to providing an abortion. Underlying both the denial and the dissuasion were reports of disrespect and condemnation from providers. Participants described how providers doubted or forced them to justify their reasons for having an abortion, stigmatized them for seeking multiple abortions or later abortions, and ascribed misinformation about abortion safety. Despite reports of denial, dissuasion, and disrespect, abortion clients generally felt that providers had their best interest at heart and were grateful for having access to an abortion., Conclusions: Participants in Ethiopia experienced providers as gatekeepers to legal abortion services, facing disrespect and judgment at facilities where they sought care. Interventions aimed at increasing awareness of abortion laws such that clients understand their rights and values clarification interventions for providers could help reduce barriers to accessing care and improve the quality of abortion services., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (© 2022 Bercu, Jacobson, Gebrehanna, Ramirez, Katz, Filippa and Baum.)
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- 2022
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39. Study protocol for Video Images about Decisions to Improve Ethical Outcomes with Palliative Care Educators (VIDEO-PCE): a pragmatic stepped wedge cluster randomised trial of older patients admitted to the hospital
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Lakin JR, Zupanc SN, Lindvall C, Moseley ET, Das S, Sciacca K, Cabral HJ, Burns EA, Carney MT, Itty J, Lopez S, Emmert K, Martin NJ, Lambert S, Polo J, Sanghani S, Dugas JN, Gomez M, Winter MR, Wang N, Gabry-Kalikow S, Dobie A, Amshoff M, Cucinotta T, Joel M, Caruso LB, Ramirez AM, Salerno K, Ogunneye Q, Henault L, Davis AD, Volandes A, and Paasche-Orlow MK
- Subjects
- Adult, Communication, Hospitalization, Hospitals, Humans, Randomized Controlled Trials as Topic, Hospice and Palliative Care Nursing, Palliative Care
- Abstract
Introduction: Despite the known benefit to patients and families, discussions about goals, values and preferences for medical care in advancing serious illness often do not occur. Many system and clinician factors, such as patient and clinician reticence and shortage of specialty palliative care teams, contribute to this lack of communication. To address this gap, we designed an intervention to promote goals-of-care conversations and palliative care referrals in the hospital setting by using trained palliative care educators and video decision aids. This paper presents the rationale, design and methods for a trial aimed at addressing barriers to goals-of-care conversations for hospitalised adults aged 65 and older and those with Alzheimer's disease and related Dementias, regardless of age., Methods and Analysis: The Video Image about Decisions to Improve Ethical Outcomes with Palliative Care Educators is a pragmatic stepped wedge, cluster randomised controlled trial, which aims to improve and extend goals-of-care conversations in the hospital setting with palliative care educators trained in serious illness communication and video decision aids. The primary outcome is the proportion of patients with goals-of-care documentation in the electronic health record. We estimate that over 9000 patients will be included., Ethics and Dissemination: The Institutional Review Board (IRB) at Boston Medical Center will serve as the single IRB of record for all regulatory and ethical aspects of this trial. BMC Protocol Number: H-41482. Findings will be presented at national meetings and in publications. This trial is registered at ClinicalTrials.gov., Trial Registration Number: NCT04857060; ClinicalTrials.gov., Competing Interests: Competing interests: Dr. Angelo Volandes has a financial interest in ACP Decisions, a non-profit organisation developing advance care planning video decision support tools. Dr. Volandes’ interests were reviewed and are managed by MGH and Mass General Brigham in accordance with their conflict-of-interest policies. Aretha Delight Davis is an employee of ACPD and the spouse of Angelo Volandes. No other disclosures to report., (© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.)
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- 2022
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40. Personalized Medicine Approach in a DCM Patient with LMNA Mutation Reveals Dysregulation of mTOR Signaling.
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Neupane B, Pradhan K, Ortega-Ramirez AM, Aidery P, Kucikas V, Marks M, van Zandvoort MAMJ, Klingel K, Witte KK, Gründer S, Marx N, and Gramlich M
- Abstract
Background: Mutations in the Lamin A/C ( LMNA ) gene are responsible for about 6% of all familial dilated cardiomyopathy (DCM) cases which tend to present at a young age and follow a fulminant course., Methods: We report a 47-year-old DCM patient with severely impaired left ventricular ejection fraction and NYHA functional class IV despite optimal heart failure treatment. Whole-exome sequencing revealed an LMNA E161K missense mutation as the pathogenetic cause for DCM in this patient. We generated a patient-specific LMNA -knock in ( LMNA -KI) in vitro model using mES cells., Results: Beta adrenergic stimulation of cardiomyocytes derived from LMNA -KI mES cells resulted in augmented mTOR signaling and increased dysregulation of action potentials, which could be effectively prevented by the mTOR-inhibitor rapamycin. A cardiac biopsy confirmed strong activation of the mTOR-signaling pathway in the patient. An off-label treatment with oral rapamycin was initiated and resulted in an improvement in left ventricular ejection fraction (27.8% to 44.5%), NT-BNP (8120 ng/L to 2210 ng/L) and NYHA functional class., Conclusion: We have successfully generated the first in vitro model to recapitulate a patient-specific LMNA E161K mutation which leads to a severe form of DCM. The model may serve as a template for individualized and specific treatment of heart failure.
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- 2022
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41. Polifonías de la educación comunitaria y popular : Diez años construyendo pedagogía para la paz, la diversidad y los Derechos Humanos
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Rincón, Sonia M. Torres, Editora, Marín, Pilar Cuevas, Ramírez, Amadeo Clavijo, González, Helberth Augusto Choachí, Sánchez, Clara Patricia Castro, Rodríguez, Diana Lucía Gómez, Salcedo, Johana Huepa, Urrego, Marcela Rodríguez, Torres-Cotrino, Johan, Camargo, Camilo Jiménez, Cristancho, Liliana Chaparro, Rincón, Sonia M. Torres, de Valdés, Stephanny Parra Ordóñez, Figueroa, Jessica Corpas, Corredor, Janneth Galeano, Cortés, Carolina Silva, Arboleda, Greissy Paula, Valbuena, Gloria María Chaves, Santos, Fernando González, Rincón, Sonia M. Torres, Marín, Pilar Cuevas, Ramírez, Amadeo Clavijo, González, Helberth Augusto Choachí, Sánchez, Clara Patricia Castro, Rodríguez, Diana Lucía Gómez, Salcedo, Johana Huepa, Urrego, Marcela Rodríguez, Torres-Cotrino, Johan, Camargo, Camilo Jiménez, Cristancho, Liliana Chaparro, Rincón, Sonia M. Torres, de Valdés, Stephanny Parra Ordóñez, Figueroa, Jessica Corpas, Corredor, Janneth Galeano, Cortés, Carolina Silva, Arboleda, Greissy Paula, Valbuena, Gloria María Chaves, and Santos, Fernando González
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- 2017
42. Perspectives on high-quality interpersonal care among people obtaining abortions in Argentina.
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Bercu C, Filippa S, Ramirez AM, Katz A, Grosso B, Zurbriggen R, Vázquez S, and Baum SE
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- Ambulatory Care Facilities, Argentina, Female, Humans, Pregnancy, Qualitative Research, Quality of Health Care, Abortion, Induced psychology
- Abstract
Introduction: Little is known about how people who have abortions describe high-quality interpersonal care in Argentina. This qualitative study aimed to understand preferences and priorities in their interactions with providers., Study Design: We conducted 24 in-depth interviews with people who obtained abortions at a comprehensive reproductive health clinic or with support from a feminist accompaniment group in Buenos Aires and Neuquén, Argentina. We iteratively coded transcripts using a thematic analysis approach based on interpersonal domains present in current quality of care frameworks., Results: Participants described high-quality abortion care as feeling acompañamiento and contención from their providers - terms that imply receiving kind, caring, compassionate and emotionally supportive care throughout their abortion. They described four key elements of interpersonal interactions: attentive communication from providers and accompaniers, clear and understandable information provision, non-judgmental support, and individualized options for pain management., Conclusions: People obtaining abortions in Argentina consistently identified receiving compassionate and supportive care throughout an abortion as a key aspect of care. The findings have implications for incorporating people's perspectives in the development of care guidelines, training of providers, and monitoring and improving of services. This is particularly important as the government of Argentina prepares to expand legal access to abortion., (© 2022. The Author(s).)
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- 2022
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43. Myocarditis in children after COVID-19 vaccine.
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Aljohani OA, Arcilla L, Kaushik N, Cresalia NM, Li B, Edwell AA, Ramirez AM, and Anwar S
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Three healthy adolescents presented with myocarditis confirmed on cardiac magnetic resonance imaging after receiving Pfizer-BioNTech COVID-19 vaccine. All patients were hemodynamically stable and had good short-term outcomes. Long-term outcomes are yet to be determined. Larger studies are needed to determine whether an association between Pfizer-BioNTech COVID-19 vaccine and myocarditis exists., Competing Interests: There are no conflicts of interest., (Copyright: © 2022 Annals of Pediatric Cardiology.)
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- 2022
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44. "I just have to hope that this abortion should go well": Perceptions, fears, and experiences of abortion clients in Nigeria.
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Katz AJ, Ramirez AM, Bercu C, Filippa S, Dirisu O, Egwuatu I, Nmezi S, Palmer L, and Baum SE
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- Adolescent, Adult, Ambulatory Care Facilities statistics & numerical data, Ambulatory Care Facilities supply & distribution, Attitude of Health Personnel, Culture, Female, History, 21st Century, Humans, Interviews as Topic, Nigeria epidemiology, Pregnancy, Quality of Health Care statistics & numerical data, Young Adult, Abortion, Induced psychology, Abortion, Induced standards, Abortion, Induced statistics & numerical data, Fear, Health Services Accessibility statistics & numerical data, Perception
- Abstract
This qualitative study aimed to examine how abortion clients in Nigeria perceive abortion and explore the role their beliefs and fears play in their care-seeking experiences and interactions with providers. Abortion is severely legally restricted in Nigeria but remains common. We conducted in-depth interviews with 25 people who obtained abortion services through three distinct models of care. We coded interview transcripts and conducted thematic analysis. Clients perceived negative attitudes toward abortion in their communities, though clients' own beliefs were more nuanced. Clients recounted a range of fears, and nearly all mentioned worrying that they might die as a result of their abortion. Despite their concerns, clients relied on social networks and word-of-mouth recommendations to identify providers they perceived as trustworthy and safe. Kind and non-judgmental treatment, clear instructions, open communication, and reassurance of privacy and confidentiality by providers alleviated client fears and helped clients feel supported throughout their abortion process. Within restrictive contexts, the mobilization of information networks, provision of high-quality care through innovative models, and personalization of care to individual needs can assuage fears and contribute to reducing stigma and increasing access to safe abortion services., Competing Interests: The authors have declared that no competing interests exist.
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- 2022
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45. Limiting protease production plays a key role in the pathogenesis of the divergent clinical isolates of Staphylococcus aureus LAC and UAMS-1.
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Rom JS, Beenken KE, Ramirez AM, Walker CM, Echols EJ, and Smeltzer MS
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- Animals, Bacterial Proteins biosynthesis, Disease Models, Animal, Female, Gene Expression Regulation, Bacterial, Humans, Mutation, Phenotype, Sepsis microbiology, Staphylococcal Infections microbiology, Staphylococcus aureus enzymology, Staphylococcus aureus metabolism, Virulence, Bacterial Proteins genetics, Biofilms growth & development, Peptide Hydrolases biosynthesis, Peptide Hydrolases genetics, Staphylococcus aureus genetics, Staphylococcus aureus pathogenicity
- Abstract
Using the USA300, methicillin-resistant Staphylococcus aureus strain LAC, we previously examined the impact of regulatory mutations implicated in biofilm formation on protease production and virulence in a murine sepsis model. Here we examined the impact of these mutations in the USA200, methicillin-sensitive strain UAMS-1. Mutation of agr, mgrA, rot, sarA and sigB attenuated the virulence of UAMS-1. A common characteristic of codY, rot, sigB , and sarA mutants was increased protease production, with mutation of rot having the least impact followed by mutation of codY, sigB and sarA , respectively. Protein A was undetectable in conditioned medium from all four mutants, while extracellular nuclease was only present in the proteolytically cleaved NucA form. The abundance of high molecular weight proteins was reduced in all four mutants. Biofilm formation was reduced in codY, sarA and sigB mutants, but not in the rot mutant. Eliminating protease production partially reversed these phenotypes and enhanced biofilm formation. This was also true in LAC codY, rot, sarA and sigB mutants. Eliminating protease production enhanced the virulence of LAC and UAMS-1 sarA, sigB and rot mutants in a murine sepsis model but did not significantly impact the virulence of the codY mutant in either strain. Nevertheless, these results demonstrate that repressing protease production plays an important role in defining critical phenotypes in diverse clinical isolates of S. aureus and that Rot, SigB and SarA play critical roles in this regard.
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- 2021
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46. A South American Experience With Postoperative Complications Following Chest Wall Reconstruction for Neoplasms.
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Carvajal C, Ramirez AM, Guerrero-Macías S, Beltrán R, Buitrago R, and Carreño J
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- Female, Humans, Middle Aged, Postoperative Complications epidemiology, Postoperative Complications etiology, Retrospective Studies, South America, Plastic Surgery Procedures, Thoracic Neoplasms surgery, Thoracic Wall surgery
- Abstract
Background: This study aims to report postoperative complications of chest wall reconstructions due to resections of primary or secondary neoplasms in a South American cancer institution and their association with prosthesis reconstruction., Materials and Methods: We retrospectively reviewed clinical records of patients with primary or secondary chest wall neoplasms who underwent resection and reconstruction between November 2008 and October 2018 at the Instituto Nacional de Cancerología, Bogota, Colombia., Results: A total of 77 patients were analyzed, 50 were women (64.9%), and the median age was 45.8 years. There were 22(28.6%) sternal resections and 55(71.4%) costal resections. Prosthetic material was used in 14(18.2%) sternal and 37(48.1%) costal reconstructions. There were 26(33.7%) early postoperative complications and 16(20.8%) reinterventions. Infections were observed in 12(15.6%) patients and 4(5.2%) patients developed respiratory complications. 33.3% of all the early infections were presented in patients with methyl methacrylate (MMA) reconstructions and the same percentage in those with titanium plates. There were six (7.8%) late complications and five were related to prosthetic material extrusion, all required prosthetic material removal. The mean overall survival was 77,3 months (SD = 8 months), and 1-year and 5-year overall survival was 85% and 61%, respectively., Conclusions: Infections were the more frequent postoperative complications in chest wall reconstructions. The use of either MMA or titanium plates was not related to early postoperative complications, although MMA reconstructions developed higher late complications and required prosthetic material removal., (© 2021. Société Internationale de Chirurgie.)
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- 2021
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47. Genetic Screening to Identify Candidate Resistance Alleles to Cry1F Corn in Fall Armyworm Using Targeted Sequencing.
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Schlum K, Lamour K, Tandy P, Emrich SJ, de Bortoli CP, Rao T, Viteri Dillon DM, Linares-Ramirez AM, and Jurat-Fuentes JL
- Abstract
Evolution of practical resistance is the main threat to the sustainability of transgenic crops producing insecticidal proteins from Bacillus thuringiensis (Bt crops). Monitoring of resistance to Cry and Vip3A proteins produced by Bt crops is critical to mitigate the development of resistance. Currently, Cry/Vip3A resistance allele monitoring is based on bioassays with larvae from inbreeding field-collected moths. As an alternative, DNA-based monitoring tools should increase sensitivity and reduce overall costs compared to bioassay-based screening methods. Here, we evaluated targeted sequencing as a method allowing detection of known and novel candidate resistance alleles to Cry proteins. As a model, we sequenced a Cry1F receptor gene ( SfABCC2 ) in fall armyworm ( Spodoptera frugiperda ) moths from Puerto Rico, a location reporting continued practical field resistance to Cry1F-producing corn. Targeted sequencing detected a previously reported Cry1F resistance allele ( SfABCC2mut ), in addition to a resistance allele originally described in S. frugiperda populations from Brazil. Moreover, targeted sequencing detected mutations in SfABCC2 as novel candidate resistance alleles. These results support further development of targeted sequencing for monitoring resistance to Bt crops and provide unexpected evidence for common resistance alleles in S. frugiperda from Brazil and Puerto Rico.
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- 2021
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48. Evaluation of a bone filler scaffold for local antibiotic delivery to prevent Staphylococcus aureus infection in a contaminated bone defect.
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Beenken KE, Campbell MJ, Ramirez AM, Alghazali K, Walker CM, Jackson B, Griffin C, King W, Bourdo SE, Rifkin R, Hecht S, Meeker DG, Anderson DE, Biris AS, and Smeltzer MS
- Subjects
- Animals, Anti-Bacterial Agents therapeutic use, Bone and Bones metabolism, Disease Models, Animal, Durapatite pharmacology, Gentamicins pharmacology, Osteogenesis drug effects, Osteomyelitis drug therapy, Osteomyelitis microbiology, Rabbits, Staphylococcal Infections drug therapy, Staphylococcal Infections prevention & control, Staphylococcus aureus pathogenicity, Tissue Scaffolds chemistry, Vancomycin pharmacology, X-Ray Microtomography methods, Anti-Bacterial Agents administration & dosage, Bone Regeneration drug effects, Drug Delivery Systems methods
- Abstract
We previously reported the development of an osteogenic bone filler scaffold consisting of degradable polyurethane, hydroxyapatite, and decellularized bovine bone particles. The current study was aimed at evaluating the use of this scaffold as a means of local antibiotic delivery to prevent infection in a bone defect contaminated with Staphylococcus aureus. We evaluated two scaffold formulations with the same component ratios but differing overall porosity and surface area. Studies with vancomycin, daptomycin, and gentamicin confirmed that antibiotic uptake was concentration dependent and that increased porosity correlated with increased uptake and prolonged antibiotic release. We also demonstrate that vancomycin can be passively loaded into either formulation in sufficient concentration to prevent infection in a rabbit model of a contaminated segmental bone defect. Moreover, even in those few cases in which complete eradication was not achieved, the number of viable bacteria in the bone was significantly reduced by treatment and there was no radiographic evidence of osteomyelitis. Radiographs and microcomputed tomography (µCT) analysis from the in vivo studies also suggested that the addition of vancomycin did not have any significant effect on the scaffold itself. These results demonstrate the potential utility of our bone regeneration scaffold for local antibiotic delivery to prevent infection in contaminated bone defects.
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- 2021
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49. The Increased Accumulation of Staphylococcus aureus Virulence Factors Is Maximized in a purR Mutant by the Increased Production of SarA and Decreased Production of Extracellular Proteases.
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Alkam D, Jenjaroenpun P, Ramirez AM, Beenken KE, Spencer HJ, and Smeltzer MS
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- Animals, Biofilms growth & development, DNA Transposable Elements, Disease Susceptibility, Extracellular Space, Gene Expression Regulation, Bacterial, Mice, Osteomyelitis microbiology, Staphylococcus aureus pathogenicity, Virulence genetics, Bacterial Proteins biosynthesis, Bacterial Proteins genetics, Endopeptidases biosynthesis, Mutation, Repressor Proteins genetics, Staphylococcal Infections microbiology, Staphylococcus aureus physiology, Trans-Activators biosynthesis, Virulence Factors genetics
- Abstract
Mutation of purR was previously shown to enhance the virulence of Staphylococcus aureus in a murine sepsis model, and this cannot be fully explained by increased expression of genes within the purine biosynthesis pathway. Rather, the increased production of specific S. aureus virulence factors, including alpha toxin and the fibronectin-binding proteins, was shown to play an important role. Mutation of purR was also shown previously to result in increased abundance of SarA. Here, we demonstrate by transposon sequencing that mutation of purR in the USA300 strain LAC increases fitness in a biofilm while mutation of sarA has the opposite effect. Therefore, we assessed the impact of sarA on reported purR -associated phenotypes by characterizing isogenic purR , sarA , and sarA/purR mutants. The results confirmed that mutation of purR results in increased abundance of alpha toxin, protein A, the fibronectin-binding proteins, and SarA, decreased production of extracellular proteases, an increased capacity to form a biofilm, and increased virulence in an osteomyelitis model. Mutation of sarA had the opposite effects on all of these phenotypes and, other than bacterial burdens in the bone, all of the phenotypes of sarA / purR mutants were comparable to those of sarA mutants. Limiting the production of extracellular proteases reversed all of the phenotypes of sarA mutants and most of those of sarA/purR mutants. We conclude that a critical component defining the virulence of a purR mutant is the enhanced production of SarA, which limits protease production to an extent that promotes the accumulation of critical S. aureus virulence factors., (Copyright © 2021 American Society for Microbiology.)
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- 2021
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50. Whole genome comparisons reveal panmixia among fall armyworm (Spodoptera frugiperda) from diverse locations.
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Schlum KA, Lamour K, de Bortoli CP, Banerjee R, Meagher R, Pereira E, Murua MG, Sword GA, Tessnow AE, Viteri Dillon D, Linares Ramirez AM, Akutse KS, Schmidt-Jeffris R, Huang F, Reisig D, Emrich SJ, and Jurat-Fuentes JL
- Subjects
- Animals, Brazil, Humans, Kenya, Spodoptera, Gene Flow, Zea mays genetics
- Abstract
Background: The fall armyworm (Spodoptera frugiperda (J.E. Smith)) is a highly polyphagous agricultural pest with long-distance migratory behavior threatening food security worldwide. This pest has a host range of > 80 plant species, but two host strains are recognized based on their association with corn (C-strain) or rice and smaller grasses (R-strain). The population genomics of the United States (USA) fall armyworm remains poorly characterized to date despite its agricultural threat., Results: In this study, the population structure and genetic diversity in 55 S. frugiperda samples from Argentina, Brazil, Kenya, Puerto Rico and USA were surveyed to further our understanding of whole genome nuclear diversity. Comparisons at the genomic level suggest a panmictic S. frugiperda population, with only a minor reduction in gene flow between the two overwintering populations in the continental USA, also corresponding to distinct host strains at the mitochondrial level. Two maternal lines were detected from analysis of mitochondrial genomes. We found members from the Eastern Hemisphere interspersed within both continental USA overwintering subpopulations, suggesting multiple individuals were likely introduced to Africa., Conclusions: Our research is the largest diverse collection of United States S. frugiperda whole genome sequences characterized to date, covering eight continental states and a USA territory (Puerto Rico). The genomic resources presented provide foundational information to understand gene flow at the whole genome level among S. frugiperda populations. Based on the genomic similarities found between host strains and laboratory vs. field samples, our findings validate the experimental use of laboratory strains and the host strain differentiation based on mitochondria and sex-linked genetic markers extends to minor genome wide differences with some exceptions showing mixture between host strains is likely occurring in field populations.
- Published
- 2021
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- View/download PDF
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