23 results on '"Tavares, Natalia Machado"'
Search Results
2. Leukotriene B₄ licenses inflammasome activation to enhance skin host defense
- Author
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Salina, Ana Carolina Guerta, Brandt, Stephanie L., Klopfenstein, Nathan, Blackman, Amondrea, Bazzano, Júlia Miranda Ribeiro, Sá-Nunes, Anderson, Byers-Glosson, Nicole, Brodskyn, Claudia, Tavares, Natalia Machado, Da Silva, Icaro Bonyek Santos, Medeiros, Alexandra I., and Serezani, C. Henrique
- Published
- 2020
3. Transcriptome Analysis Identifies the Crosstalk between Dendritic and Natural Killer Cells in Human Cutaneous Leishmaniasis
- Author
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Nunes, Sara, primary, Tibúrcio, Rafael, additional, Bonyek-Silva, Icaro, additional, Oliveira, Pablo Rafael, additional, Khouri, Ricardo, additional, Boaventura, Viviane, additional, Barral, Aldina, additional, Brodskyn, Cláudia, additional, and Tavares, Natalia Machado, additional
- Published
- 2023
- Full Text
- View/download PDF
4. Understanding the Mechanisms Controlling Leishmania amazonensis Infection In Vitro: The Role of LTB₄ Derived From Human Neutrophils
- Author
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Tavares, Natalia Machado, Araújo-Santos, Théo, Afonso, Lilian, Nogueira, Paula Monalisa, Lopes, Ulisses Gazos, Soares, Rodrigo Pedro, Bozza, Patrícia Torres, Bandeira-Melo, Christianne, Borges, Valeria Matos, and Brodskyn, Cláudia
- Published
- 2014
5. Prediabetes Induces More Severe Acute COVID-19 Associated With IL-6 Production Without Worsening Long-Term Symptoms
- Author
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Bonyek-Silva, Icaro, primary, Cerqueira-Silva, Thiago, additional, Nunes, Sara, additional, Machado, Antônio Fernando Araújo, additional, Cruz, Márcio Rivison Silva, additional, Pereira, Blenda, additional, Estrela, Leilane, additional, Silva, Jéssica, additional, Isis, Ananda, additional, Barral, Aldina, additional, Oliveira, Pablo Rafael Silveira, additional, Khouri, Ricardo, additional, Serezani, C. Henrique, additional, Brodskyn, Cláudia, additional, Caldas, Juliana Ribeiro, additional, Barral-Netto, Manoel, additional, Boaventura, Viviane, additional, and Tavares, Natalia Machado, additional
- Published
- 2022
- Full Text
- View/download PDF
6. Keratinocytes and Activation of TREM-1 Pathway in Cutaneous Leishmaniasis Lesions
- Author
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Nunes, Sara, primary, Ampuero, Mariana Rosa, additional, Bonyek-Silva, Ícaro, additional, Lima, Reinan, additional, Lima, Filipe Rocha, additional, Arruda, Sérgio Marcos, additional, Khouri, Ricardo, additional, Oliveira, Pablo Rafael Silveira, additional, Barral, Aldina, additional, Boaventura, Viviane Sampaio, additional, Brodskyn, Cláudia Ida, additional, and Tavares, Natalia Machado, additional
- Published
- 2021
- Full Text
- View/download PDF
7. Metabolic disorders and post-acute hospitalization in black/mixed-race patients with long COVID in Brazil: A cross-sectional analysis.
- Author
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Barreto, Ana Paula Andrade, Barreto Filho, Marcio Andrade, Duarte, Lucimeire Cardoso, Cerqueira-Silva, Thiago, Camelier, Aquiles, Tavares, Natalia Machado, Barral-Netto, Manoel, Boaventura, Viviane, and Lima, Marcelo Chalhoub Coelho
- Subjects
POST-acute COVID-19 syndrome ,METABOLIC disorders ,CROSS-sectional method ,PATIENT readmissions ,MEDICAL care ,CORONARY vasospasm - Abstract
Background: Although low-middle income countries have been disproportionately affected by the COVID-19 pandemic, there is scarce information about the impact of long COVID on their population. This study aimed to evaluate long COVID symptomatology, complications (hospital readmission and metabolic disorders), and main clinical features that impact Quality of Life (QoL). Methods: This cross-sectional study provides a detailed clinical and laboratory picture of individuals who presented residual symptoms after mild to severe acute COVID-19. Between Aug-2020 to Sep-2021, long COVID patients were evaluated in a reference center for long COVID in Bahia State, Brazil. The EQ-5D-5L questionnaire accessed QoL. Results: A total of 1164 (52 ±13.4 years, 57% female, 88% black/mixed-race) were evaluated 2.3 [IQR = 1.6–3.7] months after mild (n = 351, 30.2%), moderate (338, 29.0%) or severe (475, 40.8%) acute illness. Dyspnea (790, 67.9%), fatigue (738, 63.5%), and chest pain (525, 42.9%) were the most frequent residual symptoms regardless of acute severity, affecting the QoL of 88.9% of patients (n/N—826/925), mainly the domains of anxiety/depression and pain/discomfort. High levels of HbA1c were detected for 175 out of 664 patients (26.6%), 40% of them without a previous diagnosis of diabetes mellitus. Of note, hospital admission one-to-three months after the acute phase of disease was required for 51 (4.4%) patients. Conclusion: In this majority-black/mixed-race population, long COVID was associated with post-acute hospitalization, newly diagnosed diabetes mellitus, and decreased QoL, particularly in women and regardless of disease severity of acute infection, suggesting important implications for health care system. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
8. Oral Tolerance Induced by Heat Shock Protein 65-Producing Lactococcus lactis Mitigates Inflammation in Leishmania braziliensis Infection
- Author
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Guerra, Priscila Valera, primary, Andrade, Camila Mattos, additional, Nunes, Ivanéia Valeriano, additional, Gama, Brena Cardoso, additional, Tibúrcio, Rafael, additional, Santos, Washington Luis Conrado, additional, Azevedo, Vasco Ariston, additional, Tavares, Natalia Machado, additional, Rebouças, Juliana de Souza, additional, Maiolii, Tatiani Uceli, additional, Faria, Ana Maria Caetano, additional, and Brodskyn, Cláudia Ida, additional
- Published
- 2021
- Full Text
- View/download PDF
9. LTB4-Driven Inflammation and Increased Expression of ALOX5/ACE2 During Severe COVID-19 in Individuals With Diabetes
- Author
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Bonyek-Silva, Icaro, primary, Machado, Antônio Fernando Araújo, additional, Cerqueira-Silva, Thiago, additional, Nunes, Sara, additional, Silva Cruz, Márcio Rivison, additional, Silva, Jéssica, additional, Santos, Reinan Lima, additional, Barral, Aldina, additional, Oliveira, Pablo Rafael Silveira, additional, Khouri, Ricardo, additional, Serezani, C. Henrique, additional, Brodskyn, Cláudia, additional, Caldas, Juliana Ribeiro, additional, Barral-Netto, Manoel, additional, Boaventura, Viviane, additional, and Tavares, Natalia Machado, additional
- Published
- 2021
- Full Text
- View/download PDF
10. Post-Acute COVID Syndrome, the Aftermath of Mild to Severe COVID-19 in Brazilian Patients
- Author
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Andrade Barreto, Ana Paula, primary, Duarte, Lucimeire Cardoso, additional, Cerqueira-Silva, Thiago, additional, Barreto Filho, Marcio Andrade, additional, Camelier, Aquiles, additional, Tavares, Natalia Machado, additional, Barral-Netto, Manoel, additional, Boaventura, Viviane, additional, and Coelho Lima, Marcelo Chalhoub, additional
- Published
- 2021
- Full Text
- View/download PDF
11. Leukotriene B 4 licenses inflammasome activation to enhance skin host defense
- Author
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Salina, Ana Carolina Guerta, primary, Brandt, Stephanie L., additional, Klopfenstein, Nathan, additional, Blackman, Amondrea, additional, Bazzano, Júlia Miranda Ribeiro, additional, Sá-Nunes, Anderson, additional, Byers-Glosson, Nicole, additional, Brodskyn, Claudia, additional, Tavares, Natalia Machado, additional, Da Silva, Icaro Bonyek Santos, additional, Medeiros, Alexandra I., additional, and Serezani, C. Henrique, additional
- Published
- 2020
- Full Text
- View/download PDF
12. Leukotriene B4licenses inflammasome activation to enhance skin host defense
- Author
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Salina, Ana Carolina G, primary, Brandt, Stephanie, additional, Klopfenstein, Nathan, additional, Blackman, Amondrea, additional, Byers-Glosson, Nicole, additional, Brodskyn, Claudia, additional, Tavares, Natalia Machado, additional, Silva, Icaro Bonyek Santos Da, additional, de Medeiros, Alexandra I, additional, and Serezani, C. Henrique, additional
- Published
- 2020
- Full Text
- View/download PDF
13. LTB4-Driven Inflammation and Increased Expression of / During Severe COVID-19 in Individuals With Diabetes.
- Author
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Bonyek-Silva, Icaro, Machado, Antônio Fernando Araújo, Cerqueira-Silva, Thiago, Nunes, Sara, Silva Cruz, Márcio Rivison, Silva, Jéssica, Santos, Reinan Lima, Barral, Aldina, Oliveira, Pablo Rafael Silveira, Khouri, Ricardo, Serezani, C. Henrique, Brodskyn, Cláudia, Caldas, Juliana Ribeiro, Barral-Netto, Manoel, Boaventura, Viviane, and Tavares, Natalia Machado
- Subjects
COVID-19 ,MONONUCLEAR leukocytes ,SARS-CoV-2 ,COVID-19 pandemic ,OXYGEN saturation - Abstract
Diabetes is a known risk factor for severe coronavirus disease 2019 (COVID-19), the disease caused by the new coronavirus severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). However, there is a lack of knowledge about the mechanisms involved in the evolution of COVID-19 in individuals with diabetes. We aimed to evaluate whether the chronic low-grade inflammation of diabetes could play a role in the development of severe COVID-19. We collected clinical data and blood samples of patients with and without diabetes hospitalized for COVID-19. Plasma samples were used to measure inflammatory mediators and peripheral blood mononuclear cells, for gene expression analysis of the SARS-CoV-2 main receptor system (ACE2/TMPRSS2), and for the main molecule of the leukotriene B4 (LTB4) pathway (ALOX5). We found that diabetes activates the LTB4 pathway and that during COVID-19 it increases ACE2/TMPRSS2 as well as ALOX5 expression. Diabetes was also associated with COVID-19-related disorders, such as reduced oxygen saturation as measured by pulse oximetry/fraction of inspired oxygen (FiO2) and arterial partial pressure of oxygen/FiO2 levels, and increased disease duration. In addition, the expressions of ACE2 and ALOX5 are positively correlated, with increased expression in patients with diabetes and COVID-19 requiring intensive care assistance. We confirmed these molecular results at the protein level, where plasma LTB4 is significantly increased in individuals with diabetes. In addition, IL-6 serum levels are increased only in individuals with diabetes requiring intensive care assistance. Together, these results indicate that LTB4 and IL-6 systemic levels, as well as ACE2/ALOX5 blood expression, could be early markers of severe COVID-19 in individuals with diabetes. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
14. New Role of P. brasiliensis α-Glucan: Differentiation of Non-conventional Dendritic Cells
- Author
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Souza, Ana Camila Oliveira, primary, Favali, Cecília, additional, Soares, Naiara Caroline, additional, Tavares, Natalia Machado, additional, Jerônimo, Márcio Sousa, additional, Veloso Junior, Paulo Henrique, additional, Marina, Clara Luna, additional, Santos, Claire, additional, Brodskyn, Cláudia, additional, and Bocca, Anamelia Lorenzetti, additional
- Published
- 2019
- Full Text
- View/download PDF
15. Integrated Analysis Reveals That miR-193b, miR-671, and TREM-1 Correlate With a Good Response to Treatment of Human Localized Cutaneous Leishmaniasis Caused by Leishmania braziliensis
- Author
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Nunes, Sara, primary, Silva, Icaro Bonyek, additional, Ampuero, Mariana Rosa, additional, Noronha, Almério Libório Lopes de, additional, Souza, Lígia Correia Lima de, additional, Correia, Thaizza Cavalcante, additional, Khouri, Ricardo, additional, Boaventura, Viviane Sampaio, additional, Barral, Aldina, additional, Ramos, Pablo Ivan Pereira, additional, Brodskyn, Cláudia, additional, Oliveira, Pablo Rafael Silveira, additional, and Tavares, Natalia Machado, additional
- Published
- 2018
- Full Text
- View/download PDF
16. CD8(+) granzyme B(+)-mediated tissue injury vs. CD4(+)IFNγ(+)-mediated parasite killing in human cutaneous leishmaniasis
- Author
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Santos, Claire da Silva, Oliveira, Viviane Sampaio Boaventura de, Cardoso, Cristina Ribeiro de Barros, Tavares, Natalia Machado, Lordelo, Morgana J, Noronha, Almério Libório Lopes de, Costa, Jackson Mauricio Lopes, Borges, Valeria de Matos, Oliveira, Camila Indiani de, Van Weyenbergh, Johan Jozef Rosa Maria, Barral, Aldina Maria Prado, Barral Netto, Manoel, and Brodskyn, Claudia Ida
- Subjects
Linfócitos T CD4-Positivos/imunologia ,Adulto ,Granzimas/imunologia ,Linfócitos T CD8-Positivos/imunologia ,Pele/imunologia ,Leishmania braziliensis/imunologia ,Marcação In Situ das Extremidades Cortadas ,Técnicas de Cocultura ,Leishmaniose Cutânea/patologia ,Interferon gama/imunologia ,Células Cultivadas ,Marcadores Biológicos/metabolismo ,Leishmaniose Cutânea/imunologia ,Movimento Celular/imunologia ,Adolescente - Abstract
Universidade Federal da Bahia. Faculdade de Medicina da Bahia. Salvador, BA, Brasil / Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil Universidade Federal da Bahia. Faculdade de Medicina da Bahia. Salvador, BA, Brasil / Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil Universidade de São Paulo. Faculdade de Ciências Farmacêuticas. Departamento de Análises Clínicas, Toxicológicas e Bromatológicas . São Paulo, SP, Brasil Universidade Federal da Bahia. Faculdade de Medicina da Bahia. Salvador, BA, Brasil / Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil Universidade Federal da Bahia. Faculdade de Medicina da Bahia. Salvador, BA, Brasil / Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil Universidade Federal da Bahia. Faculdade de Medicina da Bahia. Salvador, BA, Brasil / Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil Universidade Federal da Bahia. Faculdade de Medicina da Bahia. Salvador, BA, Brasil / Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil Universidade Federal da Bahia. Faculdade de Medicina da Bahia. Salvador, BA, Brasil / Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil / Instituto de Investigação em Imunologia. São Paulo, SP, Brasil Universidade Federal da Bahia. Faculdade de Medicina da Bahia. Salvador, BA, Brasil / Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil / Instituto de Investigação em Imunologia. São Paulo, SP, Brasil Universidade Federal da Bahia. Faculdade de Medicina da Bahia. Salvador, BA, Brasil / Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil / Instituto de Investigação em Imunologia. São Paulo, SP, Brasil Universidade Federal da Bahia. Faculdade de Medicina da Bahia. Salvador, BA, Brasil / Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil Universidade Federal da Bahia. Faculdade de Medicina da Bahia. Salvador, BA, Brasil / Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil Universidade Federal da Bahia. Faculdade de Medicina da Bahia. Salvador, BA, Brasil / Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil A protective or deleterious role of CD8þT cells in human cutaneous leishmaniasis (CL) has been debated. The present report explores the participation of CD8þT cells in disease pathogenesis as well as in parasite killing. CD8þT cells accumulated in CL lesions as suggested by a higher frequency of CD8þCD45ROþT cells and CD8þCLAþT cells compared with peripheral blood mononuclear cells. Upon Leishmania braziliensis restimulation, most of the CD8þT cells from the lesion expressed cytolytic markers, CD107a and granzyme B. Granzyme B expression in CL lesions positively correlated with lesion size and percentage of TUNEL-positive cells. We also observed a significantly higher percentage of TUNEL-positive cells and granzyme B expression in the biopsies of patients showing a more intense necrotic process. Furthermore, coculture of infected macrophages and CD8þ T lymphocytes resulted in the release of granzyme B, and the use of granzyme B inhibitor, as well as z-VAD, Fas:Fc, or anti-IFN-g, had no effect upon parasite killing. However, coculture of infected macrophages with CD4þT cells strongly increased parasite killing, which was completely reversed by anti-IFN-g. Our results reveal a dichotomy in human CL: CD8þ granzyme BþT cells mediate tissue injury, whereas CD4þIFN-gþT cells mediate parasite killing.
- Published
- 2013
17. Toll Like Receptors Have mRNA Differentiated Expression In Dendritic Cells In Crisis-State Sickle Cell Anemia Patients, Suggesting a Pivotal Role Of These Molecules and Cell Type In The Maintenance Of Inflammatory Response
- Author
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Cajado, Cyntia, primary, Fukutani, Kyioshi Ferreira, additional, Boas, Wendell Vilas, additional, Veloso Cerqueira, Bruno Antônio, additional, Tavares, Natalia Machado, additional, Leite, Ivana, additional, Siqueira, Isadora, additional, Lyra, Isa, additional, Adorno, Elisangela, additional, and Goncalves, Marilda Souza, additional
- Published
- 2013
- Full Text
- View/download PDF
18. MicroRNA como biomarcadores para identificação de indivíduos com pré-diabetes e diagnóstico precoce do diabetes
- Author
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Neves, Victor de Barros Serrano, Macambira, Simone Garcia, Tavares, Natalia Machado, Nonaka, Caroline Kymie Vasques, and Franco, Glória Regina
- Subjects
Bioquímica ,Transcriptoma ,Molecular Mechanism ,Mecanismos moleculares ,Diabetes ,Gene Expression ,Expressão gênica ,Transcriptome - Abstract
Submitted by PMBqBM null (pmbqbm@ufba.br) on 2021-11-30T18:19:21Z No. of bitstreams: 1 Dissertação_microRNA COMO BIOMARCADORES PARA IDENTIFICAÇÃO DE INDIVÍDUOS COM PRÉ-DIABETES E DIAGNÓSTICO PRECOCE DO DIABETES_Victor de Barros Serrano Neves.pdf: 1279373 bytes, checksum: 3f0a9241661baab62a2a238069f55542 (MD5) Approved for entry into archive by Delba Rosa (delba@ufba.br) on 2021-12-20T19:52:14Z (GMT) No. of bitstreams: 1 Dissertação_microRNA COMO BIOMARCADORES PARA IDENTIFICAÇÃO DE INDIVÍDUOS COM PRÉ-DIABETES E DIAGNÓSTICO PRECOCE DO DIABETES_Victor de Barros Serrano Neves.pdf: 1279373 bytes, checksum: 3f0a9241661baab62a2a238069f55542 (MD5) Made available in DSpace on 2021-12-20T19:52:14Z (GMT). No. of bitstreams: 1 Dissertação_microRNA COMO BIOMARCADORES PARA IDENTIFICAÇÃO DE INDIVÍDUOS COM PRÉ-DIABETES E DIAGNÓSTICO PRECOCE DO DIABETES_Victor de Barros Serrano Neves.pdf: 1279373 bytes, checksum: 3f0a9241661baab62a2a238069f55542 (MD5) FAPESB Introdução: O diabetes mellitus (DM) é uma doença crônica decorrente de defeitos na produção, secreção ou sinalização da insulina. Pré-diabetes é um estado sem sintomas onde o indivíduo apresenta níveis de glicemia de jejum entre 100 - 120mg/dl e hemoglobina glicada entre 5,7 e 6,5%. Antes definido como um estado latente, atualmente é definido como um período de risco para nefropatia, neuropatia e destruição das células β-pancreáticas. Neste contexto, torna-se relevante a identificação de marcadores biológicos, tais como microRNA (miRNA), para este estado patológico contribuindo para o diagnóstico precoce. Os miRNA são pequenos RNA que não codificam proteínas, mas são considerados importantes reguladores pós-transcricionais. São apontados como potenciais biomarcadores, uma vez que tem seus níveis de expressão alterados em função do desenvolvimento ou do grau de severidade de diversas doenças como diabetes, câncer e esquizofrenia. No presente estudo, visamos identificar um perfil de expressão de miRNA que pode viabilizar o diagnóstico precoce do pré-diabetes. Resultados: Após o levantamento dos transcriptomas publicamente disponíveis em NCBI GEO dataset, um transcriptoma atendeu aos critérios de inclusão deste estudo. A partir deste, foram identificados trinta e três miRNA com perfil de expressão aumentado no grupo pré-diabético em relação ao controle (FC≥1,5 p-valor≤ 0,05) e dois no grupo diabético (FC≥1,5 p-valor≤ 0,05). A rede de interação gerada pelo programa Cytoscape mostrou os miRNAs selecionados e seus alvos diferencialmente expressos no transcriptoma de validação. Cinco destes miRNA apresentaram maiores valores de centralidade na rede de interação miRNA-mRNA (let-7a, Let-7b, miR-106b, miR-93 e miR-17). Estes miRNA apresentaram maior sensibilidade e especificidade para o pré-diabetes (AUC = 0,794). Conclusão: Os cinco miRNA identificados estão envolvidos em diversas vias intracelulares relacionadas à resistência insulínica e destruição das células βpancreática e estão diferencialmente modulados no transcriptoma analisado neste estudo, podendo ser apontados como biomarcadores exploratórios promissores para diagnóstico precoce de DM2. Introduction: Diabetes Mellitus (DM) is a chronic disease due to impairment in insulin signaling, secretion or production. Prediabetes is an asymptomatic state in which subjects fasting glucose is between 100-120mg/dl and glycated hemoglobin is at the range of 5,7-6,5%. Previously defined as a latent state, now it is recognized as a risk factor for nephropathy and neuropathy development, and also for β-cell destruction. In this context, the identification of biological markers that have disrupted expression in pathological states can contribute to an early diagnosis. microRNAs (miRNA) are noncoding RNA, considered important in the post-translation regulation of genes. They are pointed out as potential biomarkers, since their expression level becomes altered due to the development or aggravation of many diseases such as diabetes, cancer, and schizophrenia. The present study aimed to identify a miRNA expression profile able to ensure an accurate early diagnosis of prediabetes. Publicly available transcriptomes were analyzed through bioinformatics tools. Results: After screening conducted at NCBI GEO datasets, one dataset matched our inclusion criteria. From which thirtythree miRNA were significantly upregulated in prediabetic subjects versus control (FC>1,5 p-valor≤ 0,05) and two were upregulated in the diabetic versus control group (FC>1,5 p-valor≤ 0,05). A miRNA-mRNA network was created using the upregulated miRNA and its regulated targets in the validation transcriptome using the Cytoscape software. Five miRNAs presented a greater centrality score from the miRNA-mRNA network. In which two (miR-93 and Let-7a) had better values for sensibility and specificity (AUC =0,829 e 0,824 respectively). Conclusion: The five miRNAs identified are involved in several intracellular pathways related to insulin resistance, destruction of β-pancreatic cells and are differentially expressed in the dataset analyzed in this study, which can be proposed as promising exploratory biomarkers for the early diagnosis of prediabetes.
- Published
- 2020
19. MicroRNA como biomarcadores para identificação de indivÃduos com pré-diabetes e diagnóstico precoce do diabetes
- Author
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Neves, Victor de Barros Serrano, Macambira, Simone Garcia, Tavares, Natalia Machado, Nonaka, Caroline Kymie Vasques, and Franco, Glória Regina
- Subjects
Transcriptoma ,Molecular Mechanism ,Mecanismos moleculares ,Diabetes ,BioquÃmica ,Expressão gênica ,Gene Expression ,Transcriptome - Abstract
Submitted by PMBqBM null (pmbqbm@ufba.br) on 2021-11-30T18:19:21Z No. of bitstreams: 1 Dissertação_microRNA COMO BIOMARCADORES PARA IDENTIFICAÃÃO DE INDIVÃDUOS COM PRÃ-DIABETES E DIAGNÃSTICO PRECOCE DO DIABETES_Victor de Barros Serrano Neves.pdf: 1279373 bytes, checksum: 3f0a9241661baab62a2a238069f55542 (MD5) Approved for entry into archive by Delba Rosa (delba@ufba.br) on 2021-12-20T19:52:14Z (GMT) No. of bitstreams: 1 Dissertação_microRNA COMO BIOMARCADORES PARA IDENTIFICAÃÃO DE INDIVÃDUOS COM PRÃ-DIABETES E DIAGNÃSTICO PRECOCE DO DIABETES_Victor de Barros Serrano Neves.pdf: 1279373 bytes, checksum: 3f0a9241661baab62a2a238069f55542 (MD5) Made available in DSpace on 2021-12-20T19:52:14Z (GMT). No. of bitstreams: 1 Dissertação_microRNA COMO BIOMARCADORES PARA IDENTIFICAÃÃO DE INDIVÃDUOS COM PRÃ-DIABETES E DIAGNÃSTICO PRECOCE DO DIABETES_Victor de Barros Serrano Neves.pdf: 1279373 bytes, checksum: 3f0a9241661baab62a2a238069f55542 (MD5) FAPESB Introdução: O diabetes mellitus (DM) é uma doença crônica decorrente de defeitos na produção, secreção ou sinalização da insulina. Pré-diabetes é um estado sem sintomas onde o indivÃduo apresenta nÃveis de glicemia de jejum entre 100 - 120mg/dl e hemoglobina glicada entre 5,7 e 6,5%. Antes definido como um estado latente, atualmente é definido como um perÃodo de risco para nefropatia, neuropatia e destruição das células β-pancreáticas. Neste contexto, torna-se relevante a identificação de marcadores biológicos, tais como microRNA (miRNA), para este estado patológico contribuindo para o diagnóstico precoce. Os miRNA são pequenos RNA que não codificam proteÃnas, mas são considerados importantes reguladores pós-transcricionais. São apontados como potenciais biomarcadores, uma vez que tem seus nÃveis de expressão alterados em função do desenvolvimento ou do grau de severidade de diversas doenças como diabetes, câncer e esquizofrenia. No presente estudo, visamos identificar um perfil de expressão de miRNA que pode viabilizar o diagnóstico precoce do pré-diabetes. Resultados: Após o levantamento dos transcriptomas publicamente disponÃveis em NCBI GEO dataset, um transcriptoma atendeu aos critérios de inclusão deste estudo. A partir deste, foram identificados trinta e três miRNA com perfil de expressão aumentado no grupo pré-diabético em relação ao controle (FCâ¥1,5 p-valor⤠0,05) e dois no grupo diabético (FCâ¥1,5 p-valor⤠0,05). A rede de interação gerada pelo programa Cytoscape mostrou os miRNAs selecionados e seus alvos diferencialmente expressos no transcriptoma de validação. Cinco destes miRNA apresentaram maiores valores de centralidade na rede de interação miRNA-mRNA (let-7a, Let-7b, miR-106b, miR-93 e miR-17). Estes miRNA apresentaram maior sensibilidade e especificidade para o pré-diabetes (AUC = 0,794). Conclusão: Os cinco miRNA identificados estão envolvidos em diversas vias intracelulares relacionadas à resistência insulÃnica e destruição das células βpancreática e estão diferencialmente modulados no transcriptoma analisado neste estudo, podendo ser apontados como biomarcadores exploratórios promissores para diagnóstico precoce de DM2. Introduction: Diabetes Mellitus (DM) is a chronic disease due to impairment in insulin signaling, secretion or production. Prediabetes is an asymptomatic state in which subjects fasting glucose is between 100-120mg/dl and glycated hemoglobin is at the range of 5,7-6,5%. Previously defined as a latent state, now it is recognized as a risk factor for nephropathy and neuropathy development, and also for β-cell destruction. In this context, the identification of biological markers that have disrupted expression in pathological states can contribute to an early diagnosis. microRNAs (miRNA) are noncoding RNA, considered important in the post-translation regulation of genes. They are pointed out as potential biomarkers, since their expression level becomes altered due to the development or aggravation of many diseases such as diabetes, cancer, and schizophrenia. The present study aimed to identify a miRNA expression profile able to ensure an accurate early diagnosis of prediabetes. Publicly available transcriptomes were analyzed through bioinformatics tools. Results: After screening conducted at NCBI GEO datasets, one dataset matched our inclusion criteria. From which thirtythree miRNA were significantly upregulated in prediabetic subjects versus control (FC>1,5 p-valor⤠0,05) and two were upregulated in the diabetic versus control group (FC>1,5 p-valor⤠0,05). A miRNA-mRNA network was created using the upregulated miRNA and its regulated targets in the validation transcriptome using the Cytoscape software. Five miRNAs presented a greater centrality score from the miRNA-mRNA network. In which two (miR-93 and Let-7a) had better values for sensibility and specificity (AUC =0,829 e 0,824 respectively). Conclusion: The five miRNAs identified are involved in several intracellular pathways related to insulin resistance, destruction of β-pancreatic cells and are differentially expressed in the dataset analyzed in this study, which can be proposed as promising exploratory biomarkers for the early diagnosis of prediabetes.
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- 2020
20. Avaliação do potencial terapêutico das células mesenquimais e do meio condicionado no tratamento das disfunções cardíacas decorrentes da obesidade e DM2 experimental
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Daltro, Pâmela Santana, Macambira, Simone Garcia, Baccan, Gyselle Chrystina, Guimarães, Elisalva Teixeira, França, Luciana Souza de Aragão, and Tavares, Natalia Machado
- Subjects
Bioquímica ,Disfunção cardíaca ,Obesidade ,Células tronco mesenquimais ,Mesenchymal stromal cells ,Cardiac dysfunction ,Obesity ,Terapia Celular ,Cell therapy - Abstract
Submitted by PMBqBM null (pmbqbm@ufba.br) on 2021-11-26T18:55:41Z No. of bitstreams: 1 TESE Pamela S Daltro_PMBqBM UFBA.pdf: 2934190 bytes, checksum: b2daa5b258e251d443e279afc0984d91 (MD5) Approved for entry into archive by Delba Rosa (delba@ufba.br) on 2021-11-29T15:07:25Z (GMT) No. of bitstreams: 1 TESE Pamela S Daltro_PMBqBM UFBA.pdf: 2934190 bytes, checksum: b2daa5b258e251d443e279afc0984d91 (MD5) Made available in DSpace on 2021-11-29T15:07:25Z (GMT). No. of bitstreams: 1 TESE Pamela S Daltro_PMBqBM UFBA.pdf: 2934190 bytes, checksum: b2daa5b258e251d443e279afc0984d91 (MD5) FAPESB Hábitos alimentares com altos teores de gordura e o estilo de vida sedentário são fatores desencadeantes da obesidade, diabetes mellitus tipo 2 (DM2) e insuficiência cardíaca. Células mesenquimais (MSC) surgem como uma ferramenta terapêutica capaz de melhorar o quadro de doenças cardiovasculares, mas também de outras condições degenerativas, devido ao seu efeito regenerativo induzido pela sua ação parácrina. Com base nisso, os fatores secretados no meio condicionado (MC) destas células também são investigados na regeneração tecidual. Este estudo visou avaliar o potencial terapêutico das MSC e do seu MC no tratamento das complicações cardíacas em modelo experimental de obesidade e diabetes induzidas por dieta com alto teor de gordura (HFD). Avaliações bioquímicas, murinométricas e funcionais cardíacas foram realizadas nos períodos: pré-indução da obesidade, pós-indução e póstratamento. Após 36 semanas de uso da HFD, esta foi substituída pela dieta padrão seguida pelo tratamento: MSC, MC e DMEM. A disfunção metabólica foi avaliada através de parâmetros bioquímicos e índice de massa corpórea. A função cardíaca foi avaliada por eletrocardiografia, ecocardiografia e teste ergométrico. A presença de fibrose no miocárdio foi avaliada por análise histopatológica. Os mecanismos de ação da terapia celular foram investigados no tecido cardíaco por qRT-PCR. A caracterização do MC foi realizada por protein array que revelou a presença de 19 proteínas incluindo citocinas e fatores de crescimento. Os camundongos alimentados com HFD apresentaram arritmias cardíacas, expressão alterada de genes cardíacos e fibrose do miocárdio, refletindo na redução da capacidade de efetuar esforço físico. A administração da MSC ou MC reverteu as arritmias e recuperou a capacidade de realizar exercício físico. Na primeira etapa deste estudo, observouse a melhora funcional cardíaca em consonância com a normalização da expressão dos genes GATA4, conexina 43 e COL1A1 nos corações de camundongos tratados com MSC ou MC. A expressão dos genes troponina I, adiponectina, TGF-β1, PPARγ, IGF-1, SOCS3, MMP9 e TIMP1 normalizaram após o tratamento com MSC, mas não com o MC. Além disso, a administração de MSC ou MC reduziu o percentual de área com fibrose. A fim de elucidar a melhora significativa alcançada pelas MSC, na segunda etapa deste estudo, aprofundou-se a investigação dos mecanismos moleculares envolvidos neste efeito terapêutico. Foi investigada a expressão de genes relacionados ao remodelamento tecidual (SPARC, CTGF e SMAD7), à inflamação (CCL2 e CHI3L3), bem como, à sobrevivência e proliferação celular (PTEN e STAT3) por qRT-PCR. Elevados níveis da expressão gênica do SMAD7, SPARC, CTGF, CCL2, CHI3L3, STAT3 e PTEN foram detectados apenas no grupo tratado com MSC. Os resultados apresentados neste estudo sugerem que MSC e CM têm um efeito benéfico sobre os distúrbios cardíacos decorrentes da obesidade e DM2, corroborando com a ação parácrina das MSC através da modulação de elementos envolvidos em processos de regeneração tecidual, tais como desenvolvimento de fibrose. High fat eating habits and sedentary lifestyle are triggering factors of obesity, diabetes mellitus type 2 (DM2) and heart failure. Mesenchymal cells (MSC) appear as a therapeutic tool capable of improving cardiovascular disease, but also other degenerative conditions, due to its regenerative effect induced by its paracrine action. Based on this, the factors secreted in the conditioned medium (CM) of these cells are also investigated in tissue regeneration. This study aimed to evaluate the therapeutic potential of MSC and its CM in the treatment of cardiac complications in an experimental model of obesity and diabetes induced by high fat diet (HFD). Biochemical, murinometric and cardiac functional evaluations were performed in the following periods: pre-induction of obesity, post-induction and post-treatment. After 36 weeks of use of HFD, it was replaced by the standard diet followed by treatment: MSC, MC and DMEM. Metabolic dysfunction was assessed by biochemical parameters and body mass index. Cardiac function was assessed by electrocardiography, echocardiography and treadmill test. The presence of myocardial fibrosis was assessed by histopathological analysis. The action mechanisms of cell therapy were investigated in cardiac tissue by qRT-PCR. CM characterization was performed by protein array which revealed the presence of 19 proteins including cytokines and growth factors. HFD-fed mice had cardiac arrhythmias, altered expression of cardiac genes, and myocardial fibrosis, reflecting the reduced ability to exercise. MSC or CM administration reversed arrhythmias and regained the ability to exercise. In the first stage of this study, cardiac functional improvement was observed in line with normalization of GATA4, connexin 43 and COL1A1 gene expression in the hearts of mice treated with MSC or CM. The expression of troponin I, adiponectin, TGF-β1, PPARγ, IGF-1, SOCS3, MMP9 and TIMP1 genes normalized after treatment with MSC, but not with CM. In addition, administration of MSC or CM reduced the percentage of fibrosis area. In order to elucidate the most significant improvement achieved by MSC, in the second stage of this study, the investigation of the molecular mechanisms involved in this therapeutic effect was deepened. The expression of genes related to tissue remodeling (SPARC, CTGF and SMAD7), inflammation (CCL2 and CHI3L3), as well as cell survival and proliferation (PTEN and STAT3) by qRT-PCR were investigated. High levels of SMAD7, SPARC, CTGF, CCL2, CHI3L3, STAT3 and PTEN gene expression were detected only in the MSC treated group. These results suggest that MSC and CM have a beneficial effect on cardiac disorders due to obesity and DM2, corroborating to the paracrine action of MSCs by modulating elements involved in tissue regeneration processes, such as fibrosis development.
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- 2020
21. Recent advances in the development and clinical application of miRNAs in infectious diseases.
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Nunes S, Bastos R, Marinho AI, Vieira R, Benício I, de Noronha MA, Lírio S, Brodskyn C, and Tavares NM
- Abstract
In the search for new biomarkers and therapeutic targets for infectious diseases, several molecules have been investigated. Small RNAs, known as microRNAs (miRs), are important regulators of gene expression, and have emerged as promising candidates for these purposes. MiRs are a class of small, endogenous non-coding RNAs that play critical roles in several human diseases, including host-pathogen interaction mechanisms. Recently, miRs signatures have been reported in different infectious diseases, opening new perspectives for molecular diagnosis and therapy. MiR profiles can discriminate between healthy individuals and patients, as well as distinguish different disease stages. Furthermore, the possibility of assessing miRs in biological fluids, such as serum and whole blood, renders these molecules feasible for the development of new non-invasive diagnostic and prognostic tools. In this manuscript, we will comprehensively describe miRs as biomarkers and therapeutic targets in infectious diseases and explore how they can contribute to the advance of existing and new tools. Additionally, we will discuss different miR analysis platforms to understand the obstacles and advances of this molecular approach and propose their potential clinical applications and contributions to public health., Competing Interests: All authors declare that they have no commercial or financial relationships that could be construed as a potential conflict of interest disclosure., (© 2024 The Authors.)
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- 2024
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22. LTB 4 -Driven Inflammation and Increased Expression of ALOX5 / ACE2 During Severe COVID-19 in Individuals With Diabetes.
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Bonyek-Silva I, Machado AFA, Cerqueira-Silva T, Nunes S, Silva Cruz MR, Silva J, Santos RL, Barral A, Oliveira PRS, Khouri R, Serezani CH, Brodskyn C, Caldas JR, Barral-Netto M, Boaventura V, and Tavares NM
- Subjects
- Angiotensin-Converting Enzyme 2 genetics, Arachidonate 5-Lipoxygenase genetics, COVID-19 metabolism, Gene Expression Regulation, Humans, Inflammation metabolism, Leukotriene B4 genetics, Risk Factors, Signal Transduction, Angiotensin-Converting Enzyme 2 metabolism, Arachidonate 5-Lipoxygenase metabolism, COVID-19 pathology, Diabetes Mellitus pathology, Leukotriene B4 metabolism, SARS-CoV-2
- Abstract
Diabetes is a known risk factor for severe coronavirus disease 2019 (COVID-19), the disease caused by the new coronavirus severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). However, there is a lack of knowledge about the mechanisms involved in the evolution of COVID-19 in individuals with diabetes. We aimed to evaluate whether the chronic low-grade inflammation of diabetes could play a role in the development of severe COVID-19. We collected clinical data and blood samples of patients with and without diabetes hospitalized for COVID-19. Plasma samples were used to measure inflammatory mediators and peripheral blood mononuclear cells, for gene expression analysis of the SARS-CoV-2 main receptor system ( ACE2 / TMPRSS2 ), and for the main molecule of the leukotriene B
4 (LTB4 ) pathway ( ALOX5 ). We found that diabetes activates the LTB4 pathway and that during COVID-19 it increases ACE2 / TMPRSS2 as well as ALOX5 expression. Diabetes was also associated with COVID-19-related disorders, such as reduced oxygen saturation as measured by pulse oximetry/fraction of inspired oxygen (FiO2 ) and arterial partial pressure of oxygen/FiO2 levels, and increased disease duration. In addition, the expressions of ACE2 and ALOX5 are positively correlated, with increased expression in patients with diabetes and COVID-19 requiring intensive care assistance. We confirmed these molecular results at the protein level, where plasma LTB4 is significantly increased in individuals with diabetes. In addition, IL-6 serum levels are increased only in individuals with diabetes requiring intensive care assistance. Together, these results indicate that LTB4 and IL-6 systemic levels, as well as ACE2 / ALOX5 blood expression, could be early markers of severe COVID-19 in individuals with diabetes., (© 2021 by the American Diabetes Association.)- Published
- 2021
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23. Cell Migration and Cell Adhesion Assays to Investigate Leishmania-Host Cell Interaction.
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Luz YDS, Paixão AR, Bernardes CPOS, da Silva TS, Tavares NM, Brodskyn CI, Veras PST, and de Menezes JPB
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- Cell Adhesion, Cell Communication, Cell Movement, Humans, Leishmania, Leishmaniasis
- Abstract
Leishmania is an intracellular protozoan parasite that causes a broad spectrum of clinical manifestations, ranging from self-resolving localized cutaneous lesions to a highly fatal visceral form of the disease. An estimated 12 million people worldwide are currently infected, and another 350 million face risk of infection. It is known that host cells infected by Leishmania parasites, such as macrophages or dendritic cells, can migrate to different host tissues, yet how migration contributes to parasite dissemination and homing remains poorly understood. Therefore, assessing these parasites' ability to modulate host cell response, adhesion, and migration will shed light on mechanisms involved in disease dissemination and visceralization. Cellular migration is a complex process in which cells undergo polarization and protrusion, allowing them to migrate. This process, regulated by actin and tubulin-based microtubule dynamics, involves different factors, including the modulation of cellular adhesion to the substrate. Cellular adhesion and migration processes have been investigated using several models. Here, we describe a method to characterize the migratory aspects of host cells during Leishmania infection. This detailed protocol presents the differentiation and infection of dendritic cells, the analysis of host cell motility and migration, and the formation of adhesion complexes and actin dynamics. This in vitro protocol aims to further elucidate mechanisms involved in Leishmania dissemination within vertebrate host tissues and can also be modified and applied to other cell migration studies.
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- 2021
- Full Text
- View/download PDF
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