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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Aspectos clínicos-laboratoriais, perfil de quimiocinas e micropartículas circulantes em pacientes portadores da infecção crônica pelo VHC antes e durante a terapia tripla

Ribeiro, Isabela Gomes January 2015 (has links)
Submitted by Nuzia Santos (nuzia@cpqrr.fiocruz.br) on 2015-11-20T17:45:33Z No. of bitstreams: 1 IsabelaGomesRibeiro.pdf: 30073116 bytes, checksum: 9aac4c6cb4b86a1ee88a09e7d840ddde (MD5) / Approved for entry into archive by Nuzia Santos (nuzia@cpqrr.fiocruz.br) on 2015-11-20T17:45:52Z (GMT) No. of bitstreams: 1 IsabelaGomesRibeiro.pdf: 30073116 bytes, checksum: 9aac4c6cb4b86a1ee88a09e7d840ddde (MD5) / Made available in DSpace on 2015-11-20T17:45:52Z (GMT). No. of bitstreams: 1 IsabelaGomesRibeiro.pdf: 30073116 bytes, checksum: 9aac4c6cb4b86a1ee88a09e7d840ddde (MD5) Previous issue date: 2015 / Fundação Oswaldo Cruz. Centro de Pesquisa Rene Rachou. Belo Horizonte, MG, Brasil / Diante de constantes avanços no entendimento da infecção pelo VHC e mudanças no esquema terapêutico, torna-se necessário uma melhor compreensão da cinética de biomarcadores imunológicos ao longo do tratamento triplo e a sua importância na monitoração terapêutica e no alcance da resposta virológica sustentada (RVS) pelos pacientes ao término do tratamento. Neste estudo foi realizada uma caracterização cinética dos aspectos clínico-laboratoriais, perfil de quimiocinas e micropartículas circulantes em pacientes com infecção crônica pelo VHC, antes e durante a terapia tripla com interferon peguilado, ribavirina e inibidor de protease (telaprevir ou boceprevir). Foram avaliados 20 pacientes infectados com o vírus VHC com genótipo 1 em tratamento com terapia tripla e 20 indivíduos saudáveis, doadores de sangue, que compuseram o grupo controle para o estabelecimento dos valores de referência para análise de quimiocinas e micropartículas (MPs) circulantes. As quimiocinas CCL2/MCP-1, CCL5/RANTES, CXCL8/IL-8, CXCL9/MIG e CXCL10/IP10 e MPs derivadas de eritrócitos, células endoteliais, plaquetas, leucócitos e suas subpopulações foram quantificadas em soro e plasma, respectivamente,empregando citometria de fluxo,comparando os dados antes do tratamento (AT) e durante o tratamento (DT) nassemanas 2, 4, 8, 12, 24 e 48. Nossos resultados demonstraram que 70,0% dos pacientes eram do sexo masculino e 35,0% do sexo feminino, com idade média de 58,5 anos. Dos vinte pacientes avaliados 75,0% apresentavam o genótipo 1b e 30,0% o genótipo 1a do VHC. Quatorze pacientes completaram o tratamento triplo com 86,7% de RVS. Na análise de quimiocinas, houve um aumento de CCL2 na semana 12 em comparação com AT. CXCL8 aumentou na semana 12 em comparação com AT. CXCL9 e CXCL10 diminuíram na semana 24 em relação à semana 12 DT.Na análise da frequência de MPs, aquelas originadas de neutrófilos diminuíram nas semanas 2 e 24, em comparação com a AT, diminuíram na semana 24 em comparação com a semana 8 DT e aumentaram na semana 8 em relação à semana 2 DT. As micropartículas derivadas de monócitos diminuíram nas semanas 2, 12 e 24 em comparação com AT e aumentaram na semana 48 em relação à semana 24. As MPs derivadas de linfócitos TCD3+ diminuíram nas semanas 12, 24 e 48 em comparação com AT e nas semanas 24 e 48 em relação à semana 4 DT. Já aquelasoriginadas de linfócitos TCD4+ diminuíram nas semanas 12 e 24 em comparação com AT e diminuíram na semana 12 em comparação com a semana 4 DT. Avaliações adicionais que utilizaram ferramentas de análise de sistemas biológicos revelaram que antes do tratamento houve uma elevação de enzimas hepáticas e frequências das MPs nos pacientes, e a freqüência de altos produtores de quimiocinas foi baixa. Após o tratamento, houve uma diminuição progressiva das enzimas hepáticas e micropartículas, que foi acompanhado por aumento de quimiocinas com um pico na semana 12 do tratamento. Na semana 24 do tratamento, houve uma redução na maioria dos biomarcadores em comparação com a frequência mostrada antes do tratamento, exceto para CCL2 e CCL5 que ainda estavam sendo secretadas ao final do tratamento. Em suma, as análises do presente estudo mostraram que houve um declínio dos marcadores de agressão hepática, dos níveis de quimiocinas e da frequência de micropartículas no decorrer do tratamento, sugerindo, em síntese, que o tratamento e a redução ou eliminação do VHC promove um ambiente imunomodulador com retorno da resposta imunológica dentro dos padrões esperados na ausência da infecção viral. Para grande maioria dos pacientes que terminaram o tratamento, esse panorama está associado ao alcance de resposta virológica sustentada e, consequentemente, ao sucesso do tratamento triplo. / Faced with constant advances in the understanding of HCV infection and changes in the therapeutic regimen, it becomes necessary a better understanding of the kinetics of immune biomarkers along the triple treatment, and its importance in therapeutic monitoring and scope of sustained virologic response (SVR) by patients after treatment. In this study it was performed a kinetic characterization of clinical and laboratory aspects, chemokines profile and circulating microparticles in patients with chronic HCV infection before and during triple therapy with pegylated interferon, ribavirin and protease inhibitor (telaprevir or boceprevir). 20 patients infected with genotype 1 HCV virus treated with triple therapy and 20 healthy blood donors, who comprised the control group for the establishment of benchmarks for analysis of circulating chemokines and microparticles (MPs), were assessed. The CCL2 / MCP-1, CCL5 / RANTES, CXCL8 / IL-8, CXCL9 / MIG and CXCL10 / IP10 chemokines and MPs derived from erythrocyte, endothelial cells, platelets, leukocytes and their subpopulations were quantified in serum and plasma, respectively, using flow cytometry, comparing the data before treatment (BT) and during treatment (DT) at weeks 2, 4, 8, 12, 24 and 48. Our results showed that 70.0% of patients were male and 35.0% female, mean age of 58.5 years. Of the twenty patients evaluated, 75.0% had genotype 1b and 30.0% had genotype 1a of HCV. Fourteen patients completed triple therapy with 86.7% of RVS. In the analysis of chemokines, there was an increase of CCL2 at week 12 compared to BT. CXCL8 increased at week 12 compared to BT. CXCL9 and CXCL10 decreased at week 24 compared to week 12 DT. In MPs frequency analysis, those originating from neutrophils decreased at weeks 2 and 24, compared with BT, decreased at week 24 compared to week 8 DT and increased at week 8 compared to week 2 DT. The microparticles derived from monocytes decreased at weeks 2, 12 and 24 compared with BT and increased at week 48 compared to week 24. The MPs derived TCD3 + lymphocytes decreased on days 12, 24 and 48 compared to BT and at weeks 24 and 48 compared to week 4 DT. The ones originating from CD4 + T lymphocytes, decreased at weeks 12 and 24 compared to BT and decreased at week 12 compared to week 4 DT. Additional assessments that used biological systems analysis tools revealed that before treatment there was an elevation of liver enzymes and frequencies of MPs in patients, and the frequency of high producers of chemokines was low. After treatment, there was a progressive decrease in liver enzymes and microparticles, which was accompanied by increase of chemokines with a peak at week 12 of treatment. At week 24 of treatment there was a reduction in most of the biomarkers compared with the frequency shown before treatment, except for CCL2 and CCL5 which were still secreted the end of treatment. In short, the analysis of this study showed that there was a decline of liver injury markers and of the levels of chemokines and microparticles frequency during treatment, suggesting, in essence, that the treatment and the reduction or elimination of HCV promotes immunomodulator environment with return of immune response within the standards expected in the absence of viral infection. For the vast majority of patients who completed treatment, this situation is associated with sustained virologic response range and, consequently, the success of triple therapy.

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