Erschienen in:
01.11.2014 | Original Research
Mycobacterium Tuberculosis-Specific Memory NKT Cells in Patients with Tuberculous Pleurisy
verfasst von:
Zitao Li, Binyan Yang, Yannan Zhang, Jiangjun Ma, Xinchun Chen, Suihua Lao, Baiqing Li, Changyou Wu
Erschienen in:
Journal of Clinical Immunology
|
Ausgabe 8/2014
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Abstract
Natural killer T (NKT) cells from mouse and human play a protective role in the immune responses against the infection of Mycobacterium tuberculosis. However, the characteristic of CD3+TCRvβ11+ NKT cells at the local site of M. tuberculosis infection remains poorly defined. In the present study, we found that the numbers of CD3+TCRvβ11+ NKT cells in pleural fluid mononuclear cells (PFMCs) were significantly lower than those in peripheral blood mononuclear cells (PBMCs). However, CD3+TCRvβ11+ NKT cells from PFMCs spontaneously expressed high levels of CD69 and CD25 and effector memory phenotypes of CD45ROhighCD62LlowCCR7low. After stimulation with the antigens of M. tuberculosis, CD3+TCRvβ11+ NKT cells from PFMCs produced high levels of IFN-γ. Sorted CD3+TCRvβ11+ NKT cells from PFMCs cultured with antigen presenting cells (APCs) produced IFN-γ protein and mRNA. The production of IFN-γ could be completely inhibited by AG490 and Wortmannin. In addition, CD3+TCRvβ11+ NKT cells from PFMCs expressed higher levels of Fas (CD95), FasL (CD178) and perforin but lower levels of granzyme B compared with those from PBMCs. Taken together, our data demonstrated for the first time that M. tuberculosis-specific CD3+TCRvβ11+ NKT cells participated in the local immune responses against M. tuberculosis through the production of IFN-γ and the secretion of cytolytic molecules.