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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

Reação imunoenzimática (ELISA) para detecção de imunoglobulina M, imunoglobulina G e imunoglobulina A contra a proteína rHsp-X (Rv 2031c)de Mycobacterium tuberculosis em pacientes com tuberculose pleural / Linked immunosorbent assay (ELISA) for detection of immunoglobulin M, immunoglobulin G and immunoglobulin A against the protein rHsp-X (Rv2031c) of Mycobacterium tuberculosis in patients with pleural tuberculosis

LIMONGI, Loanda Carvalho Sant'ana 18 December 2009 (has links)
Made available in DSpace on 2014-07-29T15:30:34Z (GMT). No. of bitstreams: 1 Dissertacao Loanda Carvalho S Limongi.pdf: 1004813 bytes, checksum: 09f423fef50cc45223e734df788a0c39 (MD5) Previous issue date: 2009-12-18 / Pleural tuberculosis (TBP) has often spontaneous resolution, even without treatment. However, the lack of proper diagnosis and treatment can lead to the occurrence of pulmonary and/or extra-pulmonary tuberculosis in 65% of the cases, in the five years subsequent. The objective of this study was to evaluate the effectiveness of the recombinant Hsp-X antigen (rHsp-X) in an enzyme immunoassay for determining the presence of TBP in patients with pleural effusion. For this study we used 132 samples of serum and pleural fluid (PF) from patients with pleural effusion. Of these, 97 samples were from TBP patients and 35 patients with diseases other than tuberculosis (NTBP) (28 patients with metastatic cancer, 1 patient with congestive heart failure, 2 patients whit liver failure, 1 patient with systemic lupus erythematosus and 3 patients with parapneumonic effusion). The IgM levels of PF were higher in patients with PTB than NTBP, the sensitivity and specificity of the ELISA for the PF was 42% and 83%, respectively. Testing for IgG from the serum and the PF against the recombinant antigen Hsp-X were not effective in discriminating TB patients from other diseases, the sensitivity was found to be 13% and 16% using serum and LP, respectively, with the same specificity of 83%. TBP patients presented higher levels of IgA specific for the rHSP-X than NTBP, the IgA ELISA using PF presented better sensitivity (65%) than using serum (39%), while the IgA ELISA for both types of samples presented the same specificity (83%). In conclusion, the recognition of Mycobacterium tuberculosis rHsp-X by IgA antibodies from the PF of patients with TBP reveals its possible role in the development of a diagnostic test for additional cases of TBP. Further studies must be conducted to confirm this hypothesis. / A tuberculose pleural (TBP) frequentemente tem resolução espontânea, mesmo sem tratamento. No entanto, a ausência de diagnóstico e tratamento pode levar, nos cinco anos subseqüentes, à ocorrência de tuberculose pulmonar e/ ou extrapulmonar em 65% dos casos. O objetivo deste estudo foi avaliar a eficácia da utilização do antígeno Hsp-X em um ensaio imunoenzimático para determinação da presença de TBP em indivíduos com derrame pleural. Para o estudo foram utilizadas 132 amostras de soro e líquido pleural (LP) de pacientes com derrame pleural. Destas, 97 amostras eram de pacientes TBP e 35 de pacientes com outras doenças não tuberculosas (NTBP) (28 pacientes por câncer metastático, 1 pacientes por insuficiência cardíaca congestiva, 2 paciente por insuficiência hepática, 1 paciente por lúpus eritematoso sistêmico e 3 pacientes por derrames parapneumônicos). Os níveis de IgM do LP foram mais elevados nos pacientes com TBP do que os NTBP, a sensibilidade do ELISA para do LP de 42%, para a especificidade de 83%. Os ensaios para pesquisa de IgG, do soro e do LP, contra o antígeno Hsp-X não foram eficazes em discriminar pacientes com TBP de outras doenças, a sensibilidade encontrada foi de 13% e 16%, utilizando o soro e o LP, respectivamente, para a mesma especificidade de 83%. A densidade óptica dos ensaios para pesquisa de IgA, específicos para o antígeno rHsp-X, foi mais elevada nos pacientes TBP do que os NTBP, o ELISA com a IgA do LP foi melhor que o ELISA do soro, a sensibilidade foi de 65% e 39%, respectivamente, para a mesma especificidade de 83%. Concluímos que o reconhecimento de Hsp-X recombinante de Mycobacterium tuberculosis pelos anticorpos IgA do LP de pacientes com TBP indicam que esse antígeno poderá ser utilizado para o desenvolvimento de um teste de diagnóstico complementar para casos de TBP. Estudos adicionais precisam ser realizados para confirmar tal hipótese.

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