Engagement of Toll-Like Receptor 2 on CD4+ T Cells Facilitates Local Immune Responses in Patients with Tuberculous Pleurisy
Background Although it has been recognized that Mycobacterium tuberculosis contains large amounts of Toll-like receptor 2 (TLR2) ligands, their direct effects on CD4+ T cells and the clinical implications have not been determined. Methods With the recent finding that activated CD4+ T cells express T...
Saved in:
Published in | The Journal of infectious diseases Vol. 200; no. 3; pp. 399 - 408 |
---|---|
Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Oxford
The University of Chicago Press
01.08.2009
University of Chicago Press Oxford University Press |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | Background Although it has been recognized that Mycobacterium tuberculosis contains large amounts of Toll-like receptor 2 (TLR2) ligands, their direct effects on CD4+ T cells and the clinical implications have not been determined. Methods With the recent finding that activated CD4+ T cells express TLR2 as a costimulatory receptor, we hypothesized that M. tuberculosis and its components may directly affect CD4+ T cells by engaging TLR2, thus facilitating the expansion and function of these lymphocytes in tuberculous pleura. Results Our results indicate that CD4+ T cells from the pleural fluid and peripheral blood of patients with tuberculosis show significantly increased TLR2 expression, compared with those from healthy donors. TLR2 ligand activity was also significantly higher in the tuberculous pleural fluid than in the serum from healthy donors or patients with pulmonary tuberculosis. M. tuberculosis TLR2 ligands, 19-kDa lipoprotein, and live bacillus Calmette-Guérin all modulated cytokine production (interferon γ and interleukin 17), cellular proliferation, survival, and migration of CD4+ T cells isolated from pleural fluid and activated with anti-CD3 and anti-CD28. Conclusion These data indicate that direct interaction between M. tuberculosis TLR2 ligands and CD4+ T cells facilitated local CD4+ T cell immune responses in patients with tuberculous pleurisy. |
---|---|
Bibliography: | Potential conflicts of interest: none reported. ark:/67375/HXZ-K97NCBZ6-S istex:2C8ED0C46997D1AF83E18BDCE7DDD29B3D81D54A ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0022-1899 1537-6613 |
DOI: | 10.1086/600075 |