24 results on '"Ferreira, Gabriella Freitas"'
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2. Draft genome sequence of Staphylococcus aureus sequence type 5 SA01 isolated from bloodstream infection and comparative analysis with reference strains
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Ferreira, Romulo Maia, dos Santos Silva, Douglas Henrique, Silva, Karinny Farias, de Melo Monteiro, Joveliane, Ferreira, Gabriella Freitas, Silva, Maria Raimunda Chagas, da Silva, Luís Claudio Nascimento, de Castro Oliveira, Letícia, and Monteiro, Andrea Souza
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- 2023
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3. The absence of microbiota delays the inflammatory response to Cryptococcus gattii
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Costa, Marliete Carvalho, Santos, Julliana Ribeiro Alves, Ribeiro, Maira Juliana Andrade, Freitas, Gustavo José Cota de, Bastos, Rafael Wesley, Ferreira, Gabriella Freitas, Miranda, Aline Silva, Arifa, Raquel Duque Nascimento, Santos, Patrícia Campi, Martins, Flaviano dos Santos, Paixão, Tatiane Alves, Teixeira, Antonio Lúcio, Souza, Danielle G., and Santos, Daniel Assis
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- 2016
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4. Evaluation of the interaction between polymyxin B and Pseudomonas aeruginosa biofilm and planktonic cells: reactive oxygen species induction and zeta potential
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Lima, Marlucy Rodrigues, Ferreira, Gabriella Freitas, Nunes Neto, Wallace Ribeiro, Monteiro, Joveliane de Melo, Santos, Áquila Rodrigues Costa, Tavares, Priscila Batista, Denadai, Ângelo Márcio Leite, Bomfim, Maria Rosa Quaresma, dos Santos, Vera Lúcia, Marques, Sirlei Garcia, and de Souza Monteiro, Andrea
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- 2019
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5. Multiple causations of hospitalizations due to mycoses in a Brazilian region: from anthropogenic to climate factors
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Nazareth, Ronaldo Aquino Dusi de, primary, Spinelli, Isabela, additional, Ferreira, Larissa dos Reis, additional, Freitas, Gustavo José Cota de, additional, Eufrasio, Ludmila Gouveia, additional, Holanda, Rodrigo Assunção de, additional, Santos, Daniel de Assis, additional, Santos, Julliana Ribeiro Alves dos, additional, and Ferreira, Gabriella Freitas, additional
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- 2023
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6. Solid Flocculation and Emulsifying Activities of the Lipopolysaccharide Produced by Trichosporon mycotoxinivorans CLA2
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Domingues, Vitor S., Monteiro, Andrea S., Ferreira, Gabriella Freitas, and Santos, Vera L.
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- 2017
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7. Biophysical Effects of a Polymeric Biosurfactant in Candida krusei and Candida albicans Cells
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Ferreira, Gabriella Freitas, dos Santos Pinto, Bruna Lorrana, Souza, Eliene Batista, Viana, José Lima, Zagmignan, Adrielle, dos Santos, Julliana Ribeiro Alves, Santos, Áquila Rodrigues Costa, Tavares, Priscila Batista, Denadai, Ângelo Márcio Leite, and Monteiro, Andrea Souza
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- 2016
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8. Effects of Alterations in Staphylococcus aureus Cell Membrane and Cell Wall in Antimicrobial Resistance
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Monteiro, Andrea de Souza, primary, Neto, Wallace Ribeiro Nunes, additional, Mendes, Aleff Ricardo Santos, additional, Pinto, Bruna Lorrana dos Santos, additional, da Silva, Luís Cláudio Nascimento, additional, and Ferreira, Gabriella Freitas, additional
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- 2017
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9. Hydroalcoholic Leaf Extract of Punica granatum, alone and in Combination with Calcium Hydroxide, Is Effective against Mono- and Polymicrobial Biofilms of Enterococcus faecalis and Candida albicans
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Sousa, Monica Naufel, primary, Macedo, Alessandra Teixeira, additional, Ferreira, Gabriella Freitas, additional, Furtado, Haryne Lizandrey Azevedo, additional, Pinheiro, Aruanã Joaquim Matheus Costa Rodrigues, additional, Lima-Neto, Lídio Gonçalves, additional, Fontes, Valéria Costa, additional, Ferreira, Rayana Larissa Pinheiro Soares, additional, Monteiro, Cristina Andrade, additional, Falcai, Angela, additional, Gomes, Lillian Nunes, additional, Bragança, Queila da Silva Rosa, additional, Torres, Dennyse de Sousa Brandão, additional, Galvão, Lívia Câmara de Carvalho, additional, Holanda, Rodrigo Assuncao, additional, and Santos, Julliana Ribeiro Alves, additional
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- 2022
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10. Educação em saúde para idosos de um grupo de terceira idade em Governador Valadares: enfoque no uso racional de medicamentos
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Morais, Karen de Toledo, primary, Souza, Sabrina Stefany da Silva, additional, Silva, Clarice Lima Álvares da, additional, Ávila, Thiago Vinicius, additional, Ferreira, Gabriella Freitas, additional, Paula, Patrícia Aparecida Baumgratz de, additional, Vieira, Liliana Batista, additional, and Alessandri, Ana Leticia, additional
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- 2021
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11. The role of oxidative and nitrosative bursts caused by azoles and amphotericin B against the fungal pathogen Cryptococcus gattii
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Ferreira, Gabriella Freitas, Baltazar, Ludmila de Matos, Santos, Julliana Ribeiro Alves, Monteiro, Andrea Souza, Fraga, Lucia Alves de Oliveira, Resende-Stoianoff, Maria Aparecida, and Santos, Daniel Assis
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- 2013
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12. Ursolic Acid Derivatives Induced Apoptosis and Reduces the NF-<i>κ</i>B in Human Lung Adenocarcinoma Cells
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Scherrer, Elaine Carlos, primary, Valadares, Ydia Mariele, additional, Alves, Caio Cesar Souza, additional, Ferreira, Gabriella Freitas, additional, Leão, Marcela Pereira, additional, Soares, Jessica Aline, additional, Silva, Fernando Sa, additional, Carli, Alessandra Paula, additional, Cardoso, Oswaldo, additional, Machado, Fabiana Simão, additional, and Castro, Sandra Bertelli Ribeiro, additional
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- 2019
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13. Environmental Triazole Induces Cross-Resistance to Clinical Drugs and Affects Morphophysiology and Virulence of Cryptococcus gattii and C. neoformans
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Bastos, Rafael Wesley, primary, Carneiro, Hellem Cristina Silva, additional, Oliveira, Lorena Vívien Neves, additional, Rocha, Karen Maia, additional, Freitas, Gustavo José Cota, additional, Costa, Marliete Carvalho, additional, Magalhães, Thaís Furtado Ferreira, additional, Carvalho, Vanessa Silva Dutra, additional, Rocha, Cláudia Emanuela, additional, Ferreira, Gabriella Freitas, additional, Paixão, Tatiane Alves, additional, Moyrand, Frédérique, additional, Janbon, Guilhem, additional, and Santos, Daniel Assis, additional
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- 2018
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14. Solid Flocculation and Emulsifying Activities of the Lipopolysaccharide Produced by Trichosporon mycotoxinivorans CLA2
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Domingues, Vitor S., primary, Monteiro, Andrea S., additional, Ferreira, Gabriella Freitas, additional, and Santos, Vera L., additional
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- 2016
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15. O papel do estresse oxidativo e nitrosativo gerado pelos antifúngicos em Cryptococcus gattii e sua influência na heterorresistência ao itraconazol
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Ferreira, Gabriella Freitas, Daniel de Assis Santos, Santos, Daniel de Assis, Andrade, Anderson Assunção, Souza, Daniele da Glória de, Johann, Susana, and Silva-Vergara, Mario León
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Heterorresistência ,CIENCIAS BIOLOGICAS::MICROBIOLOGIA [CNPQ] ,Estresse oxidativo ,Heteroresistance ,Microbiologia ,Cryptococcus gattii ,Itraconazol ,C. gattii ,Itraconazoles ,Oxidative burst - Abstract
PROQUALI (UFJF) Embora os principais mecanismos de ação do fluconazol, itraconazol e anfotericina B estejam relacionados ao egosterol, é possível que essas drogas tenham outros efeitos nas células fúngicas. Além dos mais, a heterorresistência é considerada um mecanismo de adaptação frente a um estresse induzido por concentrações crescentes de antifúngicos no ambiente. Sendo o itraconazol um dos azólicos usados no tratamento da criptococose, o objetivo desse estudo foi avaliar a influência do estresse oxidativo e nitrosativo gerado pelos antifúngicos em células de C. gattii e sua influência no surgimento de clones heterorresistentes. Foram estudados distintos parâmetros para avaliar os estresses oxidativo e nitrosativo induzidos pelo fluconazol, itraconazol e anfotericina B em C. gattii. Já os efeitos da heterorresistência ao itraconazol foram estudados por meio de ensaios in vitro e em modelo murino. O itraconazol simultaneamente reduziu o conteúdo de ergosterol das células de C. gattii e induziu a produção de espécies reativas de oxigênio no início do tratamento, o que levou ao aumento da atividade das enzimas peroxidase e superoxidodismutase. O mesmo não aconteceu com o fluconazol. Já a anfotericina B promoveu grande estresse oxidativo e nitrosativo nas células de C. gattii, o que levou a uma elevada peroxidação lipídica e ineficiente ativação do sistema antioxidante celular. A heterorresistência ao itraconazol foi intrínseca para todas as linhagens testaddas, alterou parâmetros farmacodinâmicos, diminuiu o diâmetro celular e o tamanho da cápsula e ativação do sistema antioxidante celular. Observou-se uma correlação positiva entre a razão superfície/volume e o nível de heterorresistência ao itraconazol. Além do mais, a heterorresistência levou a maior internalização das células criptocócicas pelos macrófagos, mas também a uma maior proliferação dentro dessa célula fagocítica, o que culminou com o aumento da virulência dos clones heterorresistentes e alta carga fúngica nos pulmões e cérebro dos camundongos. Diante desses resultados, concluiu-se que o estresse oxidativo possuiu um importante papel no mecanismo de ação do itraconazol e pode ser um dos mecanismos que levam a heterorresistência e o aumento da virulência das células de C. gattii. Although the most accepted mechanisms of action of amphotericin B and azoles are related to ergosterol, it is possible that these drugs have other effects on the fungal cell. Moreover, heteroresistance is an adaptive mechanism developed by the microorganism to counteract the stress of increasing drug concentration in the environment. Since itraconazole is used in the therapy of cryptococcosis, the aim of this study was to evaluate the role of endogenous reactive oxygen species (ROS) and peroxynitrite produced by azoles and amphotericin B in the fungus C. gattii and its influence on emergence of heteroresistante clones to itraconazole. We studied distinct parameters to evaluate the effect of oxidative and nitrosative stresses induced by fluconazole, itraconazole and amphotericin B in C. gattii cells. The effects of the heteroresistance to itraconazole were studied by performing tests in vitro and in a murine model. Itraconazole reduces the level of ergosterol and led to ROS production in C. gattii cells in the early stages of the treatment, enhancing the antioxidant activity. The same did not happen with fluconazole. Amphotericin B caused lipid peroxidation in C. gattii cells through a greatly enhanced production of oxidative and nitrosative radicals with increased lipid peroxidation and inefficient ativaction of antioxidant cellular system. Heteroresistance to itraconazole was intrinsic in all strains tested and changed pharmacodynamics parameters, diminished cell and capsule sizes, reduced ergosterol content and enhanced the antioxidant system of heteroresistant clones. Indeed, heteroresistance to itraconazole led to the increased internalization of cryptococcal cells by macrophages, but also to a prominent proliferation inside these phagocytic cells, culminating in the higher virulence of heteroresistant clones. Based on these results, we conclude that oxidative bursts play an important role in the antifungal activity of itraconazole and may be one of the mechanisms that lead to heteroresistance and the increased virulence of C. gattii.
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- 2015
16. Heteroresistance to Itraconazole Alters the Morphology and Increases the Virulence of Cryptococcus gattii
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Ferreira, Gabriella Freitas, primary, Santos, Julliana Ribeiro Alves, additional, Costa, Marliete Carvalho da, additional, Holanda, Rodrigo Assunção de, additional, Denadai, Ângelo Márcio Leite, additional, Freitas, Gustavo José Cota de, additional, Santos, Áquila Rodrigues Costa, additional, Tavares, Priscila Batista, additional, Paixão, Tatiane Alves, additional, and Santos, Daniel Assis, additional
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- 2015
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17. Fluconazole Alters the Polysaccharide Capsule of Cryptococcus gattii and Leads to Distinct Behaviors in Murine Cryptococcosis
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Santos, Julliana Ribeiro Alves, primary, Holanda, Rodrigo Assunção, additional, Frases, Susana, additional, Bravim, Mayara, additional, Araujo, Glauber de S., additional, Santos, Patrícia Campi, additional, Costa, Marliete Carvalho, additional, Ribeiro, Maira Juliana Andrade, additional, Ferreira, Gabriella Freitas, additional, Baltazar, Ludmila Matos, additional, Miranda, Aline Silva, additional, Oliveira, Danilo Bretas, additional, Santos, Carolina Maria Araújo, additional, Fontes, Alide Caroline Lima, additional, Gouveia, Ludmila Ferreira, additional, Resende-Stoianoff, Maria Aparecida, additional, Abrahão, Jonatas Santos, additional, Teixeira, Antônio Lúcio, additional, Paixão, Tatiane Alves, additional, Souza, Danielle G., additional, and Santos, Daniel Assis, additional
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- 2014
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18. Distinct cytokine profiles of circulating mononuclear cells stimulated with Staphylococcus aureus enterotoxin A in vitro during early and late episodes of chronic osteomyelitis
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Ferreira, Gabriella Freitas, primary, Moraes, Cícero, additional, Silveira, Alda Maria Soares da, additional, Correa-Oliveira, Rodrigo, additional, Teixeira-Carvalho, Andréa, additional, Martins-Filho, Olindo Assis, additional, Moreno, Elizabeth Castro, additional, Carmo, Luiz Simeão do, additional, Fraga, Lucia Alves de Oliveira, additional, and Malaquias, Luiz Cosme Cotta, additional
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- 2012
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19. Environmental Triazole Induces Cross-Resistance to Clinical Drugs and Affects Morphophysiology and Virulence of Cryptococcus gattiiand C. neoformans
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Bastos, Rafael Wesley, Carneiro, Hellem Cristina Silva, Oliveira, Lorena Vívien Neves, Rocha, Karen Maia, Freitas, Gustavo José Cota, Costa, Marliete Carvalho, Magalhães, Thaís Furtado Ferreira, Carvalho, Vanessa Silva Dutra, Rocha, Cláudia Emanuela, Ferreira, Gabriella Freitas, Paixão, Tatiane Alves, Moyrand, Frédérique, Janbon, Guilhem, and Santos, Daniel Assis
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ABSTRACTCryptococcus gattiiand Cryptococcus neoformansare environmental fungi that cause cryptococcosis, which is usually treated with amphotericin B and fluconazole. However, therapeutic failure is increasing because of the emergence of resistant strains. Because these species are constantly isolated from vegetal materials and the usage of agrochemicals is growing, we postulate that pesticides could be responsible for the altered susceptibility of these fungi to clinical drugs. Therefore, we evaluated the influence of the pesticide tebuconazole on the susceptibility to clinical drugs, morphophysiology, and virulence of C. gattiiand C. neoformansstrains. The results showed that tebuconazole exposure caused in vitrocross-resistance (CR) between the agrochemical and clinical azoles (fluconazole, itraconazole, and ravuconazole) but not with amphotericin B. In some strains, CR was observed even after the exposure ceased. Further, tebuconazole exposure changed the morphology, including formation of pseudohyphae in C. neoformansH99, and the surface charge of the cells. Although the virulence of both species previously exposed to tebuconazole was decreased in mice, the tebuconazole-exposed colonies recovered from the lungs were more resistant to azole drugs than the nonexposed cells. This in vivoCR was confirmed when fluconazole was not able to reduce the fungal burden in the lungs of mice. The tolerance to azoles could be due to increased expression of the ERG11gene in both species and of efflux pump genes (AFR1and MDR1) in C. neoformans. Our study data support the idea that agrochemical usage can significantly affect human pathogens present in the environment by affecting their resistance to clinical drugs.
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- 2017
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20. Identification of surface active compounds producing bacteria isolated from mangrove sediments
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NUNES NETO, Wallace Ribeiro, MONTEIRO, Andrea de Souza, SANTOS, Vera Lucia dos, SILVA, Luís Cláudio Nascimento, MONTEIRO, Cristina de Andrade, FERREIRA, Gabriella Freitas, and REZENDE, Rachel Passos
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análises genômicas ,resistência a metais pesados ,Biossurfactantes ,Pseudomonas aeruginosa ,genomic analysis ,Ciências Biológicas ,Biosurfactants ,heavy metal resistance - Abstract
Submitted by Jonathan Sousa de Almeida (jonathan.sousa@ufma.br) on 2022-06-13T12:49:20Z No. of bitstreams: 1 WALLACERIBEIRONUNESNETO.pdf: 5605411 bytes, checksum: 6a12b527dd9f507d2cee04ab76487bd9 (MD5) Made available in DSpace on 2022-06-13T12:49:20Z (GMT). No. of bitstreams: 1 WALLACERIBEIRONUNESNETO.pdf: 5605411 bytes, checksum: 6a12b527dd9f507d2cee04ab76487bd9 (MD5) Previous issue date: 2022-02-17 FAPEMA Mangroves are zones of sediment transitions, favoring the cycling of materials, associated with a high concentration of microorganisms, presenting vulnerability to anthropogenic actions. This study aimed to evaluate the capacity of the microbiota in mangrove sediments from the river Anil, in the city of São Luís - MA for the production of surface active compounds (CASs). The sediment samples were collected according to the EMBRAPA 2006 methodology, being inoculated in Bushnell Haas medium, containing 1 gram of the sample for 250ml of medium plus 3% (v/v) kerosene. Being identified by the MALDI-QTOF MS method as Pseudomonas aeruginosa, capable of producing surface active compounds, PSA39. Submitted to E24 analysis, drop scattering, thermal/pressure stability, pH variation and ionic stability. The PSA39 genome was sequenced by the Illumina – MiSeq platform and the pre-assembled genomic DNA sequences were annotated using the Prokka software. The genomic sequence obtained was analyzed by Rapid Annotation using Subsystem Technology (RAST) to identify metabolic pathways associated with hydrocarbon degradation and biosurfactant production. BLAST genome distance phylogeny method (GBDP), in addition to mean nucleotide identity (ANI). Also, the genome of PSA39 was submitted to comparative analysis by MAUVE, using other strains deposited in GenBank. Orthologous gene clusters were identified using OrthoVenn 2. In this study, approximately 32 strains of bacteria were isolated from mangrove sediment samples, of which 32 isolates 9 showed emulsifying activity (E24). E24 values ranged from 13% to 57.30% analyzed. Isolate PSA39 was selected for studies of growth and production of a biosurfactant with emulsifying activity. The maximum production of compounds with emulsifying activity occurred within 100 hours. The emulsifying activity and stability tests with the biosurfactant recovered with ethyl acetate showed E24 values ranging from 57% to 69.2% of yield, with an increase in stability at basic pHs, reaching 79%, in addition to resisting the test of pressure and temperature autoclaving. Genome analysis of the P. aeruginosa PSA39 strain by RAST indicated the presence of genetic subsystems in a total of 2062 genes, 1946 of which related to non-hypothetical proteins and 571 genes related to hypothetical proteins. The genome of P. aeruginosa PSA39 showed genes related to pathways responsible for the production of rhamnolipids as secondary metabolites, many genes were related to the degradation of aromatic and lymphatic hydrocarbons, in addition to several genes related to the production of siderophores, such as pyoverdine and pyochelin. Furthermore, the analyzes performed by RAST indicated that P. aeruginosa PSA39 has several molecular mechanisms for adaptation to heavy metals, such as the protein, cobalt-zinc-cadmium (CzcC). One hundred and fifteen unique (exclusive) groups were identified in isolate PSA39 with proteins with defined functions, associated with conjugation, cellular and metabolic processes of hydrocarbons such as alcohols and aromatics visualized by the comparative genomic analysis "orthovenns" associated with the RAST platform. The results of this work allowed to demonstrate the viability of using regional microorganisms present in mangroves for the production of surface active compounds with emulsifying activity, from different carbon sources, as they have good emulsification rates and stability against the diversity of environmental factors. Os manguezais são zonas de transições de sedimentos, favorecendo a ciclagem de materiais, associada a alta concentração de microrganismos, apresentando vulnerabilidade as ações antropogênicas. Este estudo teve como objetivo avaliar a capacidade da microbiota em sedimentos de manguezal do rio Anil, na cidade de São Luís - MA para a produção de compostos ativos de superfície (CASs). As amostras foram inoculadas no meio Bushnell Haas, contendo 1 grama da amostra para 250ml de meio acrescido de querosene, a 3% (v/v). Sendo identificada pelo método MALDI-QTOF MS como Pseudomonas aeruginosa, capaz de produzir compostos ativos de superfície, PSA39. Submetido a análises de E24, espalhamento da gota, estabilidade térmica/pressão, variação de pH e estabilidade iônica. O genoma da PSA39, foi sequenciado pela plataforma Illumina – MiSeq e as sequências de DNA genômico pré- montadas foram anotadas usando o software Prokka. A sequência genômica obtida foi analisada pelo Rapid Annotation using Subsystem Technology para identificação de vias metabólicas associadas com a degradação de hidrocarbonetos e produção de biossurfactante A construção da árvore filogenética foi realizada partir dos dados do sequenciamento de nucleotídeos de PSA39 utilizando como base no método de filogenia a distância do genoma BLAST, o genoma de PSA39 foi submetido a análise comparativa por MAUVE, utilizando outras linhagens de depositadas no GenBank. Os clusters de genes ortólogos foram identificados usando o OrthoVenn 2. Neste estudo foram isoladas cerca de 32 linhagens de bactérias a partir das amostras de sedimento de mangue, dos 32 isolados 9 apresentaram atividade emulsificante (E24). Os valores de E24 variaram de 13% a 57,30% analisado. O isolado PSA39 foi selecionado para estudos de crescimento e produção de biossurfactante com atividade emulsificante. A máxima produção de compostos com atividade emulsificante ocorreu no tempo de 100 horas. Os ensaios de atividade emulsificante e estabilidade com o biossurfactante recuperado com acetato de etila demonstraram valores de E24 variando entre 57% a 69,2% de rendimento, com incremento na estabilidade em pHs básico, chegando a 79%, além de resistir ao teste de autoclavagem de pressão e temperatura. A análise do genoma da estirpe P. aeruginosa PSA39 pelo RAST indicou a presença de subsistemas genéticos num total de 2062 genes sendo 1946 relacionados com proteínas não hipotéticas e 571 genes relacionados a proteínas hipotéticas. O genoma de P. aeruginosa PSA39 apresentou genes relacionados com vias responsáveis pela produção do ramnolípideos como metabólitos secundários, muitos genes estavam relacionados com a degradação de hidrocarbonetos aromáticos e linfáticos, além de vários genes relacionados com a produção de sideróforos, como pioverdina e pioquelina. Ademais, as análises realizadas pelo RAST indicaram que P. aeruginosa PSA39 apresenta diversos mecanismos moleculares para adaptação a metais pesados, como a proteína, cobalto-zinco- cádmio (CzcC). Sendo identificado no isolado PSA39 cento e quinze grupos únicos (exclusivos) com proteínas de funções definidas, associadas a conjugação, a processos celulares e metabólicos de hidrocarbonetos como alcools e aromáticos visualidados pela análise comparativa genômica “orthovenns” associado com a plataforma RAST. Os resultados deste trabalho permitiram demonstrar a viabilidade de utilização de microrganismos regionais presentes nos manguezais para produção de compostos ativos de superfície com atividade emulsificante, a partir de fontes de carbono distintas, por possuir bons índices de emulsificação e estabilidade perante a diversidade de fatores ambientais.
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- 2022
21. Influência de fatores climáticos na morbidade/mortalidade de micoses em Minas Gerais e avaliação de plantas nativas para tratamento de micoses
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Nazareth, Ronaldo Aquino Dusi de, Ferreira, Gabriella Freitas, Santos, Juliana Ribeiro Alves, and Castro, Sandra Bertelli Ribeiro
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Mortality for mycosis ,Hospitalizações por micoses ,Climate ,Hospitalizations for mycosis ,Mortalidades por micoses ,Clima ,CIENCIAS BIOLOGICAS::BIOQUIMICA::BIOLOGIA MOLECULAR [CNPQ] - Abstract
Micoses sistêmicas são um importante problema de saúde pública em todo o mundo, por serem negligenciadas, relacionadas a regiões com baixo desenvolvimento humano e sob influência de condições climáticas. Nesse sentido, o desenvolvimento de novos agentes antifúngicos, como advindos de plantas nativas, é essencial para essas populações. Assim, este estudo teve como objetivo analisar a influência do clima e de variáveis sociodemográficas na prevalência de micoses sistêmicas em Minas Gerais durante o período de 1998 a 2018 e avaliar atividade antifúngica in vitro de plantas nativas do Brasil. Foram determinadas as correlações entre Hospitalização por Micoses (HM) / Mortalidade por Micoses (MM) e dados sociodemográficos (densidade demográfica, facilidade de acesso ao SUS, IDH e esgotamento sanitário), ambientais (velocidade máxima do vento, velocidade média do vento, precipitação total, número de dias de precipitação, umidade relativa, temperatura máxima e temperatura mínima) e cobertura vegetal através do coeficiente de correlação de postos de Spearman. Os dados foram obtidos em bancos de dados nacionais durante o período selecionado. Já a atividade antifúngica dos extratos etanólicos das folhas de Euphorbia prostrata e Garcinia gardneriana foi avaliada através do teste de microdiluição em caldo utilizando linhagens de C. albicans, C. neoformans e C. gattii. Os resultados mostraram que cidades com densidade demográfica elevada e maior número de estabelecimentos do SUS possuem menor % de frequência de HM / MM. Já municípios com maior IDH possuem menor % de frequência de mortalidade por paracoccidioidomicose. Observou-se que a maioria das cidades mineiras com maior % de frequência relativa anual de HM e maior % de frequência relativa anual de MM por aspergilose e candidíase são de clima temperado. Os dados mostraram que a velocidade do vento é um fator climático que influenciou de maneira significativa na HM. Em relação as plantas, os extratos etanólicos não apresentaram atividade antifúngica promissora, com CIM > 100mg/L. Nossos dados mostraram que o clima exerce importante influência sobre a HM e MM, sendo necessários mais estudos para entender melhor a relação clima e micoses. Systemic mycoses are an important public health problem because they are neglected. It’s related to regions with low human development and under the influence of climatic conditions. In this way, the development of new antifungal agents from native plants is essential for these populations. This study aimed to analyze the influence of climate and sociodemographic variables on the prevalence of systemic mycoses in Minas Gerais during the period from 1998 to 2018 and to evaluate in vitro antifungal activity of plants native to Brazil. The correlation between Mycosis Hospitalizations (MH) and Mortality by Mycosis (MM), sociodemographic and climatic data obtained in national databases during the selected period using Spearman's rank correlation coefficient. The minimum inhibitory concentration (MIC) of the ethanolic extracts of the Euphorbia prostrata and Garcinia gardneriana leaves was determined for C. albicans, C. neoformans and C. gattii by broth microdilution test. Cities with high demographic density and larger amounts of SUS establishments have a lower % of MH / MM frequency. On the other hand, municipalities with higher HDI have a lower % of frequency of mortality by paracoccidioidomycosis. It was observed that most cities in Minas Gerais with the highest % of relative annual frequency of MH and MM due to aspergillosis and candidiasis have temperate climate. The data showed that wind speed is a climatic factor that significantly influenced MH. In relation to plants, ethanolic extracts did not show promising antifungal activity, with MIC> 100mg / L. Our data showed that climate has an important influence on MH and MM, and further studies are needed to better understand the relationship between climate and mycoses.
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- 2021
22. Alterações morfofisiológicas envolvidos na adaptação de Cryptococcus neoformans e Cryptococcus gattii à anfotericina B
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Bragança, Queila da Silva Rosa, Ferreira, Gabriella Freitas, Costa, Marliete Carvalho da, and Almeida, Felipe Alves de
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Evolução adaptativa ,Cryptococcus ,Adaptive evolution ,Adaptation ,Adaptação ,CIENCIAS BIOLOGICAS::BIOQUIMICA::BIOLOGIA MOLECULAR [CNPQ] - Abstract
O gênero Cryptococcus é composto por leveduras capsuladas com capacidade de infectar uma variedade de hospedeiros, como os mamíferos. Neste gênero, destacam-se como agentes etiológicos da criptococose humana Cryptococcus neoformans e Cryptococcus gattii. A anfotericina B (AmB) e os azólicos são os fármacos de primeira escolha na terapia medicamentosa. Este tratamento farmacológico normalmente se prolonga por mais de seis meses, sendo frequente a recorrência mesmo após terapia antifúngica. Há uma lacuna na literatura de como as células criptococócicas respondem a exposição contínua à AmB e quais estratégias Cryptococcus utilizam para se adaptarem frente a este estresse. Assim, o objetivo deste estudo foi avaliar as alterações morfofisiológicas envolvidas na adaptação de C. neoformans e C. gattii à AmB. Foram realizados ensaios para: avaliar a suscetibilidade de linhagens de C. neoformans e C. gattii à AmB; expor as linhagens a concentrações crescentes de AmB e obter clones expostos/adaptados; avaliar curva de morte; verificar o perfil de crescimento; analisar se a adaptação à AmB altera a morfometria, a produção de espécies reativas (ERs), a sobrevivência intracelular a macrófagos, a interação entre o sequestrador de peroxinitrito e inibidor de superóxido dismutase, a peroxidação lipídica e o potencial zeta. Assim, foi observado que duas linhagens de C. neoformans e cinco de C. gattii conseguiram crescer em concentrações superiores a concentração inibitória mínima (CIM) inicial, sendo estas classificadas como adaptadas. Os clones resultantes do processo de evolução adaptativa não apresentaram alteração na susceptilidade à AmB no teste de microdiluição em caldo, exceto a linhagem de C. neoformans ATCC WM148, e em ágar após passagens sem a presença da droga. Na curva de morte e na curva de crescimento não foi observado padrão entre as linhagens. Os clones adaptados apresentaram redução da espessura da cápsula e redução do diâmetro celular, exceto a linhagem C. neoformans ATCC WM626, bem como produziram menor quantidade de ERs na presença da AmB. Apresentou aumento do índice fagocítico após 24 h de fagocitose, redução da proliferação intracelular para C. neoformans ATCC WM148, aumento da proliferação celular para as linhagens de C. gattii e aumento do estresse oxidativo, exceto para C. neoformans ATCC WM626. Na interação com sequestrado de peroxinitrito e inibidor de SOD a interação foi indiferente entre eles. A linhagem de C. neoformans ATCC WM626 apresentou aumento da peroxidação lipídica quando tratada com CIM de H2O2. De maneira geral, as linhagens apresentaram redução da magnitude elétrica negativa após adaptação à AmB. Estes resultados fornecerão subsídios para o preenchimento de lacunas sobre o entendimento da exposição/adaptação de C. neoformans e C. gattii à AmB, assim como as alterações fenotípicas ocorridas nas células que contribuíram para este fenômeno. The Cryptococcus genus is composed of capsulated yeasts capable of infecting a variety of hosts, such as mammals. In this genus, they stand out as the etiological agents of human cryptococcosis Cryptococcus neoformans and Cryptococcus gattii. Amphotericin B (AmB) and azoles are the drugs of choice in drug therapy. This pharmacological treatment usually lasts for more than six months, with recurrence being frequent even after antifungal therapy. There is a gap in the literature on how cryptococcal cells respond to continuous exposure to AmB and what strategies Cryptococcus use to adapt to this stress. Thus, the aim of this study was to evaluate the morphophysiological changes involved in the adaptation of C. neoformans and C. gattii to AmB. Tests were carried out to: evaluate the susceptibility of C. neoformans and C. gattii strains to AmB; expose strains to increasing concentrations of AmB and obtain exposed/adapted clones; evaluate death curve; check the growth profile; to analyze whether adaptation to AmB changes morphometry, the production of reactive species (ERs), intracellular survival to macrophages, the interaction between peroxynitrite scavenger and superoxide dismutase inhibitor, lipid peroxidation and zeta potential. Thus, it was observed that two strains of C. neoformans and five of C. gattii managed to grow in concentrations above the initial minimum inhibitory concentration (MIC), which were classified as adapted. The clones resulting from the adaptive evolution process did not change in AmB susceptibility in the broth microdilution test, except for the C. neoformans ATCC WM148 strain, and in agar after passing without the drug. In the death curve and the growth curve, no pattern was observed between the strains. The adapted clones showed a reduction in the capsule thickness and a reduction in cell diameter, except for the C. neoformans ATCC WM626 strain, as well as producing a lower amount of ERs in the presence of AmB. It showed an increase in the phagocytic index after 24 h of phagocytosis, a reduction in intracellular proliferation for C. neoformans ATCC WM148, an increase in cell proliferation for C. gattii strains and an increase in oxidative stress, except for C. neoformans ATCC WM626. In the interaction with peroxynitrite sequestered and SOD inhibitor, the interaction was indifferent between them. The C. neoformans ATCC WM626 strain showed an increase in lipid peroxidation when treated with H2O2 MIC. In general, the strains showed a reduction in the negative electrical magnitude after adaptation to AmB. These results will provide subsidies to fill in gaps on the understanding of the exposure/adaptation of C. neoformans and C. gattii to AmB, as well as the phenotypic changes that occurred in the cells that contributed to this phenomenon.
- Published
- 2020
23. Identificação de parâmetros imunológicos, nutricionais e parasitológicos (S. mansoni) em um estudo caso-controle associado à hanseníase
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Oliveira, Lorena Bruna Pereira de, Fraga, Lucia Alves de Oliveira, Faria, Ana Maria Caetano de, Borges, Pauline Martins Leite, Ferreira , Gabriella Freitas, and Grossi, Maria Aparecida de Faria
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Hanseníase ,Leprosy ,Esquistossomose ,Schistosomiasis ,Co-infecção ,CIENCIAS BIOLOGICAS::BIOQUIMICA [CNPQ] ,Co-infection - Abstract
FAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais Hanseníase, doença milenar e estigmatizante apresentou em 2017, prevalência global de 192.713 casos, sendo o Brasil o segundo país com maior número de casos novos. As ações de controle estão baseadas no diagnóstico, tratamento e vigilância dos contatos. Entretanto, essa enfermidade exige abordagens mais inovadoras para o real controle. Sabe-se que infecções causadas por parasitos bem como deficiências de micronutrientes podem coexistir com a hanseníase em áreas endêmicas no Brasil. Infecções crônicas por helmintos e má nutrição parecem estar associadas à supressão da resposta imunológica. Dessa forma, propõe-se determinar fatores de risco associados à hanseníase em um grupo de estudo considerando variáveis sócio-demográficas, imunológicas, hematológicas, parasitológicas (S. mansoni) e nutricionais. Foram incluídos 3 grupos, casos (com hanseníase PB, MB, n=79), contatos (assintomáticos, convivência com paciente, n=97) e controle negativo (assintomáticos sem história de hanseníase, n=81), atendidos nas ESF de Gov. Valadares e Limeira de Mantena. Foram aplicados questionários estruturados e após coleta de sangue e fezes foram realizados exames laboratoriais para avaliação da reatividade sorológica (IgG4Swap), determinação do perfil imunológico, hemograma e quantificação de micronutrientes. Foram aplicados diferentes testes estatísticos para análise. Destacou-se o baixo grau de escolaridade dos participantes. 75% (33) dos co-infectados apresentavam nível básico de escolaridade e apenas 7,9% (14) do grupo controle (contatos e controle negativo) possuíam ensino superior. 70% dos contatos residiam com o doente e 68% dos co-infectados não tinham hábito de tratar água para consumo. Não foi mostrada associação entre hanseníase da forma clínica multibacilar e esquistossomose, entretanto constatamos uma forte correlação ente hanseníase e infecção pelo S. mansoni com um aOR de 3,37 comparando o grupo de casos e controles e ainda mais forte, um aOR de 8,33 comparando casos e contatos. Provavelmente, nossa limitação em constatar associação entre a forma multibacilar e esquistossomose se deve ao pequeno número de casos com IB positivo, e também o pequeno número de participantes com esquistossomose ativa e ainda apresentando baixa carga parasitária. No painel de citocinas verificou-se que IL-10, citocina imunoreguladora, apresentou associação com o grupo de infectados pelo S. mansoni, bem como com o grupo co-infectado x controle negativo (estimulo ML) e mono infectado (SE, PHA e ML). A IL-4 também apresentou associação com o grupo co-infectado x contato (SE) e monoinfectado (ML). Esses dados reforçam a presença de citocinas imunoreguladoras e relacionadas à resposta Th2 no grupo co-infectado. Uma correlação positiva entre perfil de citocinas próinflamatórias (IL-17, IFN-γ, TNF-α, IL-6 e IL-2) e grupo controle foi constatada, como também com o mono-infectado. Associação das quimiocinas IL-8 e IP-10 com o mono-infectado foi detectada. Indivíduos co-infectados apresentaram concentrações inadequadas de vitamina D. Concentrações adequadas de vitamina A foram observadas nos grupos controle negativo e contato. A deficiência de ferro associada a uma dieta pouco diversificada, juntamente com coinfecção, podem ser a causa da anemia observada em 55% dos indivíduos do grupo co-infectado que apresentaram parâmetros hematológicos (hemácia, hemoglobina, hematócrito) abaixo dos valores normais. Acreditamos que a continuidade desses estudos e o acompanhamento dos contatos são relevantes para melhor delinear fatores de risco. Leprosy, an age-old and stigmatizing disease presented in 2018 a global prevalence of 184.212 cases, with Brazil being the second country with the highest number of new cases. Control actions are based on the diagnosis, treatment and surveillance of contacts. However, this disease requires more innovative approaches to real control. It is known that infections caused by parasites as well as micronutrient deficiencies can coexist with leprosy in endemic areas in Brazil. Chronic helminth infections and malnutrition appear to be associated with suppression of the immune response. Thus, it is proposed to determine risk factors associated with leprosy in a study group considering socio-demographic, immunological, hematological, parasitological (S. mansoni) and nutritional variables. Three groups were included, cases (with leprosy PB, MB, n = 79), contacts (asymptomatic, history of living with the patient, n = 97) and negative control (asymptomatic without history of leprosy, n = 81), attended at ESF in Gov. Valadares and Limeira de Mantena. Structured questionnaires were applied and after collection of blood and feces, laboratory tests were carried out to assess serological reactivity (IgG4- Swap), determine the immunological profile, blood count and micronutrient quantification. Different statistical tests were applied for analysis. The low level of education of the participants was highlighted. 75% (33) of the co-infected individuals had a basic level of education and only 7.9% (14) of the control group (contacts and negative control) had higher education. 70% of the individuals in the contact group lived with the patient and 68% of the individuals in the co-infected group were not in the habit of treating drinking water. There was no association between leprosy of the multibacillary clinical form and schistosomiasis, however we found a strong correlation between leprosy and infection by S. mansoni with an aOR of 3.37 comparing the group of cases and controls and even stronger, an aOR of 8, 33 comparing cases and contacts. Probably, our limitation in finding an association between leprosy in the multibacillary form and schistosomiasis is due to the small number of cases with positive BI and also the small number of participants with active schistosomiasis and still presenting low parasitic burden. In the cytokine panel, it was found that IL-10, an immunoregulatory cytokine, was associated with group of infected individuals (S. mansoni) as well as with the co-infected group x negative control (ML stimulus) and mono infected (SE, PHA and ML). IL-4 was also associated with the co-infected x contact (SE) and mono-infected (ML) group. These data reinforce the presence of immunoregulatory and Th2-related cytokines in the co-infected group. Furthermore, through logistic regression, a positive correlation between pro-inflammatory cytokine profile (IL-17, IFN-γ, TNF-α, IL-6 and IL-2) and control group was found. When the group of co-infected and mono-infected was compared, an association of these cytokines with the mono-infected was detected. An association of chemokines IL-8 and IP-10 with the group of mono-infected was observed. Co-infected had inadequate concentrations of vitamin D, and adequate concentrations of vitamin A were observed in the negative control and contact groups. Iron deficiency associated with a poorly diversified diet, together with co-infection, may be the cause of anemia seen in 55% of individuals in the co-infected group who had hematological parameters (red blood cells, hemoglobin and hematocrit) below normal values. We believe that the continuity of these studies and the monitoring of contacts are relevant to better delineate risk factors.
- Published
- 2020
24. Environmental Triazole Induces Cross-Resistance to Clinical Drugs and Affects Morphophysiology and Virulence of Cryptococcus gattii and C. neoformans.
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Bastos RW, Carneiro HCS, Oliveira LVN, Rocha KM, Freitas GJC, Costa MC, Magalhães TFF, Carvalho VSD, Rocha CE, Ferreira GF, Paixão TA, Moyrand F, Janbon G, and Santos DA
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- Animals, Antifungal Agents pharmacology, Cryptococcosis drug therapy, Cryptococcosis microbiology, Cryptococcus gattii pathogenicity, Cryptococcus gattii physiology, Cryptococcus neoformans pathogenicity, Cryptococcus neoformans physiology, Fluconazole pharmacology, Male, Mice, Inbred C57BL, Microbial Sensitivity Tests, Virulence drug effects, Cryptococcus gattii drug effects, Cryptococcus neoformans drug effects, Drug Resistance, Multiple, Fungal drug effects, Fungicides, Industrial pharmacology, Triazoles pharmacology
- Abstract
Cryptococcus gattii and Cryptococcus neoformans are environmental fungi that cause cryptococcosis, which is usually treated with amphotericin B and fluconazole. However, therapeutic failure is increasing because of the emergence of resistant strains. Because these species are constantly isolated from vegetal materials and the usage of agrochemicals is growing, we postulate that pesticides could be responsible for the altered susceptibility of these fungi to clinical drugs. Therefore, we evaluated the influence of the pesticide tebuconazole on the susceptibility to clinical drugs, morphophysiology, and virulence of C. gattii and C. neoformans strains. The results showed that tebuconazole exposure caused in vitro cross-resistance (CR) between the agrochemical and clinical azoles (fluconazole, itraconazole, and ravuconazole) but not with amphotericin B. In some strains, CR was observed even after the exposure ceased. Further, tebuconazole exposure changed the morphology, including formation of pseudohyphae in C. neoformans H99, and the surface charge of the cells. Although the virulence of both species previously exposed to tebuconazole was decreased in mice, the tebuconazole-exposed colonies recovered from the lungs were more resistant to azole drugs than the nonexposed cells. This in vivo CR was confirmed when fluconazole was not able to reduce the fungal burden in the lungs of mice. The tolerance to azoles could be due to increased expression of the ERG11 gene in both species and of efflux pump genes ( AFR1 and MDR1 ) in C. neoformans Our study data support the idea that agrochemical usage can significantly affect human pathogens present in the environment by affecting their resistance to clinical drugs., (Copyright © 2017 American Society for Microbiology.)
- Published
- 2017
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