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Id: | 13666
| Author: | Bala, Lakshmi; Anand, Sukumar; Sinha, Sudhir
| Title: | Enhancement of human T cell response to a peptide epitope of 38kDa antigen of Mycobacterium tuberculosis by liposomes
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| Source: | s.l; s.n; 2002. 9 p. graf.
| Abstract: | Diagnosis of tuberculosis a problem, specially in the regions harboring an abundance of both pathogenic and non-pathogenic mycobacteria. This study was undertaken to assess in such a situation the predictive value of proliferative T cell response to a peptide epitope ('38G') of the 38 kDa membrane protein of Mycobacterium tuberculosis. 3[H]-thymidine incorporation assays were done with peripheral blood mononuclear cells of tuberculoid leprosy and pulmonary tuberculosis patients. The donors were also classified as PPD responders (Stimulation Index, SI> 3) or non-responders (SI < or = 3) on the basis of their T cell response to the 'Purified Protein Derivative (PPD)' of M. tuberculosis. 38G peptide was used in either free or liposome-associated form prepared by the technique of 'Dehydration-rehydration Vesicles' (Kirby and Gregoriadis, 1984). While free peptide failed to induce a positive response in study subjects, its liposomal form was T cell stimulatory and distinguished, to certain extent, between PPD responders (corresponding SI > 3 in 54 per cent subjects) and non-responders (SI > 3 in 29 per cent subjects). However, it did not differentiate between leprosy and tuberculosis. The study supports use of liposomes as adjuvant vehicles for antigenic peptides designed to activate human T cells. (AU).
| Descriptors: | ANTIGENOS DE BACTERIAS/admin ANTIGENOS DE BACTERIAS/quim ANTIGENOS DE BACTERIAS/genet HANSENIASE TUBERCULOIDE/diag HANSENIASE TUBERCULOIDE/imunol EPITOPOS/admin EPITOPOS/quim EPITOPOS/genet DIAGNOSTICO DIFERENCIAL MYCOBACTERIUM TUBERCULOSIS/quim MYCOBACTERIUM TUBERCULOSIS/genet MYCOBACTERIUM TUBERCULOSIS/imunol DADOS DE SEQUÊNCIA MOLECULAR SEQUÊNCIA DE AMINOACIDOS LINFOCITOS T/imunol TESTE TUBERCULINICO TUBERCULOSE PULMONAR/diag TUBERCULOSE PULMONAR/imunol TRANSFORMACAO LINFOCITICA - LIPOSSOMOS PESO MOLECULAR
| Limits: | ESTUDO COMPARATIVO HUMANO IN VITRO SUPPORT, NON-U.S. GOV'T
| Electronic Medium: | http://www.ilsl.br
| Location: | BR191.1; 09061/s |
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