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题目:: Control of T cell reactivation by regulatory Qa-1-restricted CD8+ T cells.
作者:: Varthaman(Aditi),Khallou-Laschet(Jamila),Clement(Marc),Fornasa(Giulia),Kim(Hye-Jung),Gaston(Anh-Thu),Dussiot(Michael),Caligiuri(Giuseppina),Herbelin(André),Kaveri(Srinivas),Cantor(Harvey),Nicoletti(Antonino)
状态:: 发布时间2010-06-07 , 更新时间 2010-06-07
期刊:: J Immunol
摘要:: Administration of attenuated pathogenic T cell clones, a procedure known as T cell vaccination, induces CD8+ T cells specific for peptides derived from the Vbeta-chain of the TCR presented by the MHC class Ib molecule, Qa-1 expressed on the vaccine cells. These regulatory CD8+ T cells have the capacity to control the activation of endogenous T cells expressing the same TCR Vbeta-chain as the vaccinating cells. We hypothesized that vaccination with NKT cells could also induce Qa-1-restricted CD8+ T cells that would control NKT cell activation. We tested this hypothesis in a murine model of Con A-induced hepatitis that is induced by NKT cells. Vaccination with NKT cells effectively induced protective Qa-1-restricted CD8+ T cells that prevented hepatitis. Surprisingly, upon vaccination with T cells expressing Vbeta-chains irrelevant to NKT cells, we discovered that the specificity of vaccine-induced Qa-1-restricted CD8+ T cells was not limited to the Vbeta-chain of the vaccinating cells. We further show that these regulatory Qa-1-restricted CD8+ T cells arise spontaneously upon polyclonal activation of T cells in the absence of deliberate T cell vaccination. These experiments provide new insight into a CD8+ T cell compartment that regulates the immediate reactivation of conventional T cells and NKT cells.
语言:: eng
DOI:: 10.4049/jimmunol.0903109

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