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1. Multi-ancestry genome-wide association analyses improve resolution of genes and pathways influencing lung function and chronic obstructive pulmonary disease risk

Author

Shrine, Nick, Izquierdo, Abril G, Chen, Jing, Packer, Richard, Hall, Robert J, Guyatt, Anna L, Batini, Chiara, Thompson, Rebecca J, Pavuluri, Chandan, Malik, Vidhi, Hobbs, Brian D, Moll, Matthew, Kim, Wonji, Tal-Singer, Ruth, Bakke, Per, Fawcett, Katherine A, John, Catherine, Coley, Kayesha, Piga, Noemi Nicole, Pozarickij, Alfred, Lin, Kuang, Millwood, Iona Y, Chen, Zhengming, Li, Liming, China Kadoorie Biobank Collaborative Group, Wijnant, Sara RA, Lahousse, Lies, Brusselle, Guy, Uitterlinden, Andre G, Manichaikul, Ani, Oelsner, Elizabeth C, Rich, Stephen S, Barr, R Graham, Kerr, Shona M, Vitart, Veronique, Brown, Michael R, Wielscher, Matthias, Imboden, Medea, Jeong, Ayoung, Bartz, Traci M, Gharib, Sina A, Flexeder, Claudia, Karrasch, Stefan, Gieger, Christian, Peters, Annette, Stubbe, Beate, Hu, Xiaowei, Ortega, Victor E, Meyers, Deborah A, Bleecker, Eugene R, Gabriel, Stacey B, Gupta, Namrata, Smith, Albert Vernon, Luan, Jian'an, Zhao, Jing-Hua, Hansen, Ailin F, Langhammer, Arnulf, Willer, Cristen, Bhatta, Laxmi, Porteous, David, Smith, Blair H, Campbell, Archie, Sofer, Tamar, Lee, Jiwon, Daviglus, Martha L, Yu, Bing, Lim, Elise, Xu, Hanfei, O'Connor, George T, Thareja, Gaurav, Albagha, Omar ME, Qatar Genome Program Research (QGPR) Consortium, Suhre, Karsten, Granell, Raquel, Faquih, Tariq O, Hiemstra, Pieter S, Slats, Annelies M, Mullin, Benjamin H, Hui, Jennie, James, Alan, Beilby, John, Patasova, Karina, Hysi, Pirro, Koskela, Jukka T, Wyss, Annah B, Jin, Jianping, Sikdar, Sinjini, Lee, Mikyeong, May-Wilson, Sebastian, Pirastu, Nicola, Kentistou, Katherine A, Joshi, Peter K, Timmers, Paul RHJ, Williams, Alexander T, Free, Robert C, Wang, Xueyang, Morrison, John L, Gilliland, Frank D, Chen, Zhanghua, Wang, Carol A, Foong, Rachel E, Harris, Sarah E, Taylor, Adele, Redmond, Paul, Cook, James P, Mahajan, Anubha, Lind, Lars, Palviainen, Teemu, Lehtimäki, Terho, Raitakari, Olli T, Kaprio, Jaakko, Rantanen, Taina, Pietiläinen, Kirsi H, Cox, Simon R, Pennell, Craig E, Hall, Graham L, Gauderman, W James, Brightling, Chris, Wilson, James F, Vasankari, Tuula, Laitinen, Tarja, Salomaa, Veikko, Mook-Kanamori, Dennis O, Timpson, Nicholas J, Zeggini, Eleftheria, Dupuis, Josée, Hayward, Caroline, Brumpton, Ben, Langenberg, Claudia, Weiss, Stefan, Homuth, Georg, Schmidt, Carsten Oliver, Probst-Hensch, Nicole, Jarvelin, Marjo-Riitta, Morrison, Alanna C, Polasek, Ozren, Rudan, Igor, Lee, Joo-Hyeon, Sayers, Ian, Rawlins, Emma L, Dudbridge, Frank, Silverman, Edwin K, Strachan, David P, Walters, Robin G, Morris, Andrew P, London, Stephanie J, Cho, Michael H, Wain, Louise V, Hall, Ian P, Tobin, Martin D, Shrine, Nick [0000-0003-3641-4371], Chen, Jing [0000-0003-1287-1930], Guyatt, Anna L. [0000-0003-1860-6337], Hobbs, Brian D. [0000-0001-9564-0745], Kim, Wonji [0000-0002-1249-797X], Coley, Kayesha [0000-0003-4951-6799], Chen, Zhengming [0000-0001-6423-105X], Li, Liming [0000-0001-5873-7089], Lahousse, Lies [0000-0002-3494-4363], Uitterlinden, Andre G. [0000-0002-7276-3387], Oelsner, Elizabeth C. [0000-0002-7481-9671], Rich, Stephen S. [0000-0003-3872-7793], Kerr, Shona M. [0000-0002-4137-1495], Vitart, Veronique [0000-0002-4991-3797], Jeong, Ayoung [0000-0003-1542-0756], Gharib, Sina A. [0000-0002-2480-4367], Gieger, Christian [0000-0001-6986-9554], Peters, Annette [0000-0001-6645-0985], Hu, Xiaowei [0000-0001-7804-7392], Smith, Albert Vernon [0000-0003-1942-5845], Luan, Jian’an [0000-0003-3137-6337], Langhammer, Arnulf [0000-0001-5296-6673], Willer, Cristen [0000-0001-5645-4966], Porteous, David [0000-0003-1249-6106], Smith, Blair H. [0000-0002-5362-9430], Campbell, Archie [0000-0003-0198-5078], Sofer, Tamar [0000-0001-8520-8860], Lee, Jiwon [0000-0002-4079-7494], Lim, Elise [0000-0001-8967-8464], Thareja, Gaurav [0000-0003-2277-6400], Albagha, Omar M. E. [0000-0001-5916-5983], Suhre, Karsten [0000-0001-9638-3912], Granell, Raquel [0000-0002-4890-4012], Faquih, Tariq O. [0000-0001-8026-2251], Hiemstra, Pieter S. [0000-0002-0238-5982], Hysi, Pirro [0000-0001-5752-2510], Koskela, Jukka T. [0000-0002-0154-7222], Jin, Jianping [0000-0002-3774-1609], Sikdar, Sinjini [0000-0003-1230-5162], Lee, Mikyeong [0000-0002-3036-3684], May-Wilson, Sebastian [0000-0003-2668-5717], Joshi, Peter K. [0000-0002-6361-5059], Timmers, Paul R. H. J. [0000-0002-5197-1267], Gilliland, Frank D. [0000-0002-9033-7269], Wang, Carol A. [0000-0002-4301-3974], Harris, Sarah E. [0000-0002-4941-5106], Mahajan, Anubha [0000-0001-5585-3420], Palviainen, Teemu [0000-0002-7847-8384], Kaprio, Jaakko [0000-0002-3716-2455], Pietiläinen, Kirsi H. [0000-0002-8522-1288], Cox, Simon R. [0000-0003-4036-3642], Pennell, Craig E. [0000-0002-0937-6165], Wilson, James F. [0000-0001-5751-9178], Vasankari, Tuula [0000-0002-1413-8970], Salomaa, Veikko [0000-0001-7563-5324], Timpson, Nicholas J. [0000-0002-7141-9189], Dupuis, Josée [0000-0003-2871-3603], Brumpton, Ben [0000-0002-3058-1059], Langenberg, Claudia [0000-0002-5017-7344], Weiss, Stefan [0000-0002-3553-4315], Homuth, Georg [0000-0001-6839-0605], Jarvelin, Marjo-Riitta [0000-0002-2149-0630], Morrison, Alanna C. [0000-0001-6381-4296], Rudan, Igor [0000-0001-6993-6884], Lee, Joo-Hyeon [0000-0002-7364-6422], Sayers, Ian [0000-0001-5601-5410], Rawlins, Emma L. [0000-0001-7426-3792], Dudbridge, Frank [0000-0002-8817-8908], Strachan, David P. [0000-0001-7854-1366], Walters, Robin G. [0000-0002-9179-0321], Morris, Andrew P. [0000-0002-6805-6014], London, Stephanie J. [0000-0003-4911-5290], Cho, Michael H. [0000-0002-4907-1657], Wain, Louise V. [0000-0003-4951-1867], Hall, Ian P. [0000-0001-9933-3216], Tobin, Martin D. [0000-0002-3596-7874], Apollo - University of Cambridge Repository, Tampere University, Department of Clinical Chemistry, Clinical Medicine, Department of General Administration, Guyatt, Anna L [0000-0003-1860-6337], Hobbs, Brian D [0000-0001-9564-0745], Uitterlinden, Andre G [0000-0002-7276-3387], Oelsner, Elizabeth C [0000-0002-7481-9671], Rich, Stephen S [0000-0003-3872-7793], Kerr, Shona M [0000-0002-4137-1495], Gharib, Sina A [0000-0002-2480-4367], Luan, Jian'an [0000-0003-3137-6337], Smith, Blair H [0000-0002-5362-9430], Albagha, Omar ME [0000-0001-5916-5983], Faquih, Tariq O [0000-0001-8026-2251], Hiemstra, Pieter S [0000-0002-0238-5982], Koskela, Jukka T [0000-0002-0154-7222], Joshi, Peter K [0000-0002-6361-5059], Timmers, Paul RHJ [0000-0002-5197-1267], Gilliland, Frank D [0000-0002-9033-7269], Wang, Carol A [0000-0002-4301-3974], Harris, Sarah E [0000-0002-4941-5106], Pietiläinen, Kirsi H [0000-0002-8522-1288], Cox, Simon R [0000-0003-4036-3642], Pennell, Craig E [0000-0002-0937-6165], Wilson, James F [0000-0001-5751-9178], Timpson, Nicholas J [0000-0002-7141-9189], Morrison, Alanna C [0000-0001-6381-4296], Rawlins, Emma L [0000-0001-7426-3792], Strachan, David P [0000-0001-7854-1366], Walters, Robin G [0000-0002-9179-0321], Morris, Andrew P [0000-0002-6805-6014], London, Stephanie J [0000-0003-4911-5290], Cho, Michael H [0000-0002-4907-1657], Wain, Louise V [0000-0003-4951-1867], Hall, Ian P [0000-0001-9933-3216], Tobin, Martin D [0000-0002-3596-7874], Epidemiology, and Internal Medicine

Subjects
Smoking, 631/208/205/2138, 45/43, article, 692/699/1785, Polymorphism, Single Nucleotide, 3142 Public health care science, environmental and occupational health, Pulmonary Disease, Chronic Obstructive, Genetics, Humans, 1182 Biochemistry, cell and molecular biology, Genetic Predisposition to Disease, Lung, Genome-Wide Association Study
Abstract

Funder: British Lung Foundation, Funder: National Institute for Health Research (NIHR), Lung-function impairment underlies chronic obstructive pulmonary disease (COPD) and predicts mortality. In the largest multi-ancestry genome-wide association meta-analysis of lung function to date, comprising 580,869 participants, we identified 1,020 independent association signals implicating 559 genes supported by ≥2 criteria from a systematic variant-to-gene mapping framework. These genes were enriched in 29 pathways. Individual variants showed heterogeneity across ancestries, age and smoking groups, and collectively as a genetic risk score showed strong association with COPD across ancestry groups. We undertook phenome-wide association studies for selected associated variants as well as trait and pathway-specific genetic risk scores to infer possible consequences of intervening in pathways underlying lung function. We highlight new putative causal variants, genes, proteins and pathways, including those targeted by existing drugs. These findings bring us closer to understanding the mechanisms underlying lung function and COPD, and should inform functional genomics experiments and potentially future COPD therapies.

Published
2023

2. Multi-ancestry genome-wide association analyses improve resolution of genes and pathways influencing lung function and chronic obstructive pulmonary disease risk

Author

Shrine, Nick, Izquierdo, Abril G, Chen, Jing, Packer, Richard, Hall, Robert J, Guyatt, Anna L, Batini, Chiara, Thompson, Rebecca J, Pavuluri, Chandan, Malik, Vidhi, Hobbs, Brian D, Moll, Matthew, Kim, Wonji, Tal-Singer, Ruth, Bakke, Per, Fawcett, Katherine A, John, Catherine, Coley, Kayesha, Piga, Noemi Nicole, Pozarickij, Alfred, Lin, Kuang, Millwood, Iona Y, Chen, Zhengming, Li, Liming, Wijnant, Sara RA, Lahousse, Lies, Brusselle, Guy, Uitterlinden, Andre G, Manichaikul, Ani, Oelsner, Elizabeth C, Rich, Stephen S, Barr, R Graham, Kerr, Shona M, Vitart, Veronique, Brown, Michael R, Wielscher, Matthias, Imboden, Medea, Jeong, Ayoung, Bartz, Traci M, Gharib, Sina A, Flexeder, Claudia, Karrasch, Stefan, Gieger, Christian, Peters, Annette, Stubbe, Beate, Hu, Xiaowei, Ortega, Victor E, Meyers, Deborah A, Bleecker, Eugene R, Gabriel, Stacey B, Gupta, Namrata, Smith, Albert Vernon, Luan, Jian’an, Zhao, Jing-Hua, Hansen, Ailin F, Langhammer, Arnulf, Willer, Cristen, Bhatta, Laxmi, Porteous, David, Smith, Blair H, Campbell, Archie, Sofer, Tamar, Lee, Jiwon, Daviglus, Martha L, Yu, Bing, Lim, Elise, Xu, Hanfei, O’Connor, George T, Thareja, Gaurav, Albagha, Omar ME, Ismail, Said I, Al-Muftah, Wadha, Badji, Radja, Mbarek, Hamdi, Darwish, Dima, Fadl, Tasnim, Yasin, Heba, Ennaifar, Maryem, Abdellatif, Rania, Alkuwari, Fatima, Alvi, Muhammad, Al-Sarraj, Yasser, Saad, Chadi, Althani, Asmaa, Fethnou, Eleni, Qafoud, Fatima, Alkhayat, Eiman, Afifi, Nahla, Tomei, Sara, Liu, Wei, Lorenz, Stephan, Syed, Najeeb, Almabrazi, Hakeem, Vempalli, Fazulur Rehaman, Temanni, Ramzi, Saqri, Tariq Abu, Khatib, Mohammedhusen, Hamza, Mehshad, Zaid, Tariq Abu, El Khouly, Ahmed, Pathare, Tushar, Poolat, Shafeeq, Al-Ali, Rashid, Al-Khodor, Souhaila, Alshafai, Mashael, Badii, Ramin, Chouchane, Lotfi, Estivill, Xavier, Fakhro, Khalid, Mokrab, Younes, Puthen, Jithesh V, Tatari, Zohreh, Suhre, Karsten, Granell, Raquel, Faquih, Tariq O, Hiemstra, Pieter S, Slats, Annelies M, Mullin, Benjamin H, Hui, Jennie, James, Alan, Beilby, John, Patasova, Karina, Hysi, Pirro, Koskela, Jukka T, Wyss, Annah B, Jin, Jianping, Sikdar, Sinjini, Lee, Mikyeong, May-Wilson, Sebastian, Pirastu, Nicola, Kentistou, Katherine A, Joshi, Peter K, Timmers, Paul RHJ, Williams, Alexander T, Free, Robert C, Wang, Xueyang, Morrison, John L, Gilliland, Frank D, Chen, Zhanghua, Wang, Carol A, Foong, Rachel E, Harris, Sarah E, Taylor, Adele, Redmond, Paul, Cook, James P, Mahajan, Anubha, Lind, Lars, Palviainen, Teemu, Lehtimäki, Terho, Raitakari, Olli T, Kaprio, Jaakko, Rantanen, Taina, Pietiläinen, Kirsi H, Cox, Simon R, Pennell, Craig E, Hall, Graham L, Gauderman, W James, Brightling, Chris, Wilson, James F, Vasankari, Tuula, Laitinen, Tarja, Salomaa, Veikko, Mook-Kanamori, Dennis O, Timpson, Nicholas J, Zeggini, Eleftheria, Dupuis, Josée, Hayward, Caroline, Brumpton, Ben, Langenberg, Claudia, Weiss, Stefan, Homuth, Georg, Schmidt, Carsten Oliver, Probst-Hensch, Nicole, Jarvelin, Marjo-Riitta, Morrison, Alanna C, Polasek, Ozren, Rudan, Igor, Lee, Joo-Hyeon, Sayers, Ian, Rawlins, Emma L, Dudbridge, Frank, Silverman, Edwin K, Strachan, David P, Walters, Robin G, Morris, Andrew P, London, Stephanie J, Cho, Michael H, Wain, Louise V, Hall, Ian P, Tobin, Martin D, Shrine, Nick [0000-0003-3641-4371], Chen, Jing [0000-0003-1287-1930], Guyatt, Anna L [0000-0003-1860-6337], Hobbs, Brian D [0000-0001-9564-0745], Kim, Wonji [0000-0002-1249-797X], Coley, Kayesha [0000-0003-4951-6799], Chen, Zhengming [0000-0001-6423-105X], Li, Liming [0000-0001-5873-7089], Lahousse, Lies [0000-0002-3494-4363], Uitterlinden, Andre G [0000-0002-7276-3387], Oelsner, Elizabeth C [0000-0002-7481-9671], Rich, Stephen S [0000-0003-3872-7793], Kerr, Shona M [0000-0002-4137-1495], Vitart, Veronique [0000-0002-4991-3797], Jeong, Ayoung [0000-0003-1542-0756], Gharib, Sina A [0000-0002-2480-4367], Gieger, Christian [0000-0001-6986-9554], Peters, Annette [0000-0001-6645-0985], Hu, Xiaowei [0000-0001-7804-7392], Smith, Albert Vernon [0000-0003-1942-5845], Luan, Jian’an [0000-0003-3137-6337], Langhammer, Arnulf [0000-0001-5296-6673], Willer, Cristen [0000-0001-5645-4966], Porteous, David [0000-0003-1249-6106], Smith, Blair H [0000-0002-5362-9430], Campbell, Archie [0000-0003-0198-5078], Sofer, Tamar [0000-0001-8520-8860], Lee, Jiwon [0000-0002-4079-7494], Lim, Elise [0000-0001-8967-8464], Thareja, Gaurav [0000-0003-2277-6400], Albagha, Omar ME [0000-0001-5916-5983], Suhre, Karsten [0000-0001-9638-3912], Granell, Raquel [0000-0002-4890-4012], Faquih, Tariq O [0000-0001-8026-2251], Hiemstra, Pieter S [0000-0002-0238-5982], Hysi, Pirro [0000-0001-5752-2510], Koskela, Jukka T [0000-0002-0154-7222], Jin, Jianping [0000-0002-3774-1609], Sikdar, Sinjini [0000-0003-1230-5162], Lee, Mikyeong [0000-0002-3036-3684], May-Wilson, Sebastian [0000-0003-2668-5717], Joshi, Peter K [0000-0002-6361-5059], Timmers, Paul RHJ [0000-0002-5197-1267], Gilliland, Frank D [0000-0002-9033-7269], Wang, Carol A [0000-0002-4301-3974], Harris, Sarah E [0000-0002-4941-5106], Mahajan, Anubha [0000-0001-5585-3420], Palviainen, Teemu [0000-0002-7847-8384], Kaprio, Jaakko [0000-0002-3716-2455], Pietiläinen, Kirsi H [0000-0002-8522-1288], Cox, Simon R [0000-0003-4036-3642], Pennell, Craig E [0000-0002-0937-6165], Wilson, James F [0000-0001-5751-9178], Vasankari, Tuula [0000-0002-1413-8970], Salomaa, Veikko [0000-0001-7563-5324], Timpson, Nicholas J [0000-0002-7141-9189], Dupuis, Josée [0000-0003-2871-3603], Brumpton, Ben [0000-0002-3058-1059], Langenberg, Claudia [0000-0002-5017-7344], Weiss, Stefan [0000-0002-3553-4315], Homuth, Georg [0000-0001-6839-0605], Jarvelin, Marjo-Riitta [0000-0002-2149-0630], Morrison, Alanna C [0000-0001-6381-4296], Rudan, Igor [0000-0001-6993-6884], Lee, Joo-Hyeon [0000-0002-7364-6422], Sayers, Ian [0000-0001-5601-5410], Rawlins, Emma L [0000-0001-7426-3792], Dudbridge, Frank [0000-0002-8817-8908], Strachan, David P [0000-0001-7854-1366], Walters, Robin G [0000-0002-9179-0321], Morris, Andrew P [0000-0002-6805-6014], London, Stephanie J [0000-0003-4911-5290], Cho, Michael H [0000-0002-4907-1657], Wain, Louise V [0000-0003-4951-1867], Hall, Ian P [0000-0001-9933-3216], Tobin, Martin D [0000-0002-3596-7874], and Apollo - University of Cambridge Repository

Subjects
hengityselimet, genome-wide association studies, perimä, 631/208/205/2138, 45/43, article, keuhkosairaudet, hengityselinten taudit, riskitekijät, 692/699/1785, keuhkot, perinnöllisyys, respiratory tract diseases
Abstract

Funder: British Lung Foundation (BLF); doi: https://doi.org/10.13039/501100000351, Funder: DH | National Institute for Health Research (NIHR); doi: https://doi.org/10.13039/501100000272, Lung-function impairment underlies chronic obstructive pulmonary disease (COPD) and predicts mortality. In the largest multi-ancestry genome-wide association meta-analysis of lung function to date, comprising 580,869 participants, we identified 1,020 independent association signals implicating 559 genes supported by ≥2 criteria from a systematic variant-to-gene mapping framework. These genes were enriched in 29 pathways. Individual variants showed heterogeneity across ancestries, age and smoking groups, and collectively as a genetic risk score showed strong association with COPD across ancestry groups. We undertook phenome-wide association studies for selected associated variants as well as trait and pathway-specific genetic risk scores to infer possible consequences of intervening in pathways underlying lung function. We highlight new putative causal variants, genes, proteins and pathways, including those targeted by existing drugs. These findings bring us closer to understanding the mechanisms underlying lung function and COPD, and should inform functional genomics experiments and potentially future COPD therapies.

Published
2023

3. Safety and efficacy of human polymerized hemoglobin on guinea pig resuscitation from hemorrhagic shock

Author

Muller, Cynthia R, Williams, Alexander T, Walser, Cynthia, Eaker, Allyn M, Sandoval, Jose Luis, Cuddington, Clayton T, Wolfe, Savannah R, Palmer, Andre F, and Cabrales, Pedro

Subjects
Inflammation, Physical Injury - Accidents and Adverse Effects, Multidisciplinary, Resuscitation, Guinea Pigs, Shock, Hematology, Cardiovascular, Rats, Polymerization, Oxygen, Heart Disease, Blood Substitutes, Animals, Humans, Hemorrhagic
Abstract

For the past thirty years, hemoglobin-based oxygen carriers (HBOCs) have been under development as a red blood cell substitute. Side-effects such as vasoconstriction, oxidative injury, and cardiac toxicity have prevented clinical approval of HBOCs. Recently, high molecular weight (MW) polymerized human hemoglobin (PolyhHb) has shown positive results in rats. Studies have demonstrated that high MW PolyhHb increased O2 delivery, with minimal effects on blood pressure, without vasoconstriction, and devoid of toxicity. In this study, we used guinea pigs to evaluate the efficacy and safety of high MW PolyhHb, since like humans guinea pigs cannot produce endogenous ascorbic acid, which limits the capacity of both species to deal with oxidative stress. Hence, this study evaluated the efficacy and safety of resuscitation from severe hemorrhagic shock with high MW PolyhHb, fresh blood, and blood stored for 2 weeks. Animals were randomly assigned to each experimental group, and hemorrhage was induced by the withdrawal of 40% of the blood volume (BV, estimated as 7.5% of body weight) from the carotid artery catheter. Hypovolemic shock was maintained for 50 min. Resuscitation was implemented by infusing 25% of the animal’s BV with the different treatments. Hemodynamics, blood gases, total hemoglobin, and lactate were not different before hemorrhage and during shock between groups. The hematocrit was lower for the PolyhHb group compared to the fresh and stored blood groups after resuscitation. Resuscitation with stored blood had lower blood pressure compared to fresh blood at 2 h. There was no difference in mean arterial pressure between groups at 24 h. Resuscitation with PolyhHb was not different from fresh blood for most parameters. Resuscitation with PolyhHb did not show any remarkable change in liver injury, inflammation, or cardiac damage. Resuscitation with stored blood showed changes in liver function and inflammation, but no kidney injury or systemic inflammation. Resuscitation with stored blood after 24 h displayed sympathetic hyper-activation and signs of cardiac injury. These results suggest that PolyhHb is an effective resuscitation alternative to blood. The decreased toxicities in terms of cardiac injury markers, vital organ function, and inflammation following PolyhHb resuscitation in guinea pigs indicate a favorable safety profile. These results are promising and support future studies with this new generation of PolyhHb as alternative to blood when blood is unavailable.

Published
2022

4. Cardiac-specific knockout and pharmacological inhibition of Endothelin receptor type B lead to cardiac resistance to extreme hypoxia

Author

Stobdan, Tsering, Zhou, Dan, Williams, Alexander T, Cabrales, Pedro, and Haddad, Gabriel G

Subjects
BQ-788, Knockout, Physiological, Immunology, Cardiac index, Cardiovascular, Sensitivity and Specificity, Mice, Medicinal and Biomolecular Chemistry, High altitude, Animals, 2.1 Biological and endogenous factors, Adaptation, Aetiology, Hypoxia, Endothelin B, EdnrB, Myocytes, Bosentan, Endothelin B Receptor Antagonists, Oxygen, Phenotype, Heart Disease, Gene Expression Regulation, Genetic Loci, Gene Knockdown Techniques, Gene Targeting, Cardiac, Receptor
Abstract

Oxygen plays a central role in cardiac energy metabolism. At high altitude where the ambient oxygen level is low, we found EDNRB is associated with human hypoxia adaptation. Our subsequent study in global heterozygous knockout mice (Ednrb-/+) revealed that cardiac function was conserved in these mice when exposed to extreme hypoxia. The major goal of this study was (i) to determine the functional role of cardiomyocyte EdnrB in maintaining cardiac function under hypoxic stress and (ii) to validate the phenotypes we detected in Ednrb-/+ mice using EDNRB blockers. Unlike the global knockouts, cardiac-specific heterozygote (EdnrBflox/+) and homozygote (EdnrBflox/flox) EdnrB knockout mice were phenotypically normal. When treated with graded low levels of oxygen (10% and 5% O2), both EdnrBflox/+ and EdnrBflox/flox were hypoxia tolerant. The cardiac indexes at 10% and 5% O2 for EdnrBflox/+ were significantly higher and lactate levels were significantly lower when compared to the cre-negative controls (P

Published
2018

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