Linked Life Data

18388182

Source:http://linkedlifedata.com/resource/pubmed/id/18388182

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pubmed-article:18388182pubmed:abstractTextGammadelta T cells play an important role in innate immunity against infections; however, the regulation of these cells remains largely unknown. In the present study, we show that ESAT-6, an antigen of Mycobacterium tuberculosis, induces IFN-gamma secretion by human gammadelta T cells. In addition, ESAT-6 also induces the activation and proliferation of gammadelta T cells. Phenotypic analysis indicates that IFN-gamma-producing gammadelta T cells are mainly effector memory cells with the surface phenotype of CD45RA(-)CD62L(-)CCR7(-). These results were further confirmed by the fact that naive gammadelta T cells from cord blood did not produce IFN-gamma in response to ESAT-6. Further studies indicated that stimulation with ESAT-6 directly induced purified gammadelta T cells to produce IFN-gamma, independent of both antigen-presenting cells and CD4(+) T cells. Unexpectedly, depletion of CD4(+) T cells markedly enhanced IFN-gamma production by gammadelta T cells, indicating that CD4(+) T cells regulate the response of gammadelta T cells. Importantly, CD4(+)CD25(+) T regulatory (Treg) cells but not CD4(+)CD25(-) T cells significantly inhibited IFN-gamma production by gammadelta T cells. Taken together, these data demonstrate for the first time that Treg cells can play an important role in the regulation of immune responses of antigen-specific human memory gammadelta T cells.lld:pubmed
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pubmed-article:18388182pubmed:articleTitleCD4+ CD25+ Treg cells inhibit human memory gammadelta T cells to produce IFN-gamma in response to M tuberculosis antigen ESAT-6.lld:pubmed
pubmed-article:18388182pubmed:affiliationDepartment of Immunology, Zhongshan School of Medicine, Key Laboratory of Tropical Disease Control Research of Ministry of Education, Sun Yat-Sen University, Guangzhou, China.lld:pubmed
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