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首页> 外文期刊>Nature immunology >MHC class Ia-restricted memory T cells inhibit expansion of a nonprotective MHC class Ib (H2-M3)-restricted memory response
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MHC class Ia-restricted memory T cells inhibit expansion of a nonprotective MHC class Ib (H2-M3)-restricted memory response

机译:MHC Ia类限制性记忆T细胞抑制非保护性MHC Ib类(H2-M3)限制性记忆反应的扩展

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摘要

Listeria monocytogenes infection generates major histocompatibility complex (MHC) class Ia-restricted and MHC class Ib-(H2-M3)-restricted effector and memory CD8~+ T cells. However, only MHC class Ia-restricted memory cells expand after rechallenge, and it is unknown if MHC class Ib-restricted memory CD8~+ T cells generated by vaccination are protective. We show here that H2-M3-restricted memory CD8~+ T cells were capable of secondary expansion but, in contrast to primary H2-M3-restricted effector cells, failed to provide protective immunity. In lm-immune mice, MHC class Ia-restricted memory CD8~+ T cells prevented the expansion of H2-M3-restricted memory T cell populations by limiting dendritic cell antigen presentation. Thus, protective immunity by H2-M3-resricted T cells is limited to primary infection, indicating that memory MHC class Ia-restricted T cells prevent nonessential immune responses during secondary infection.
机译:单核细胞增生李斯特菌感染会产生主要的组织相容性复合物(MHC)Ia级限制和MHC Ib-(H2-M3)级限制的效应细胞和记忆CD8〜+ T细胞。然而,仅MHC Ia限制性记忆的细胞在挑战后会扩增,并且未知通过疫苗接种产生的MHC Ib限制性记忆的CD8 + T细胞是否具有保护性。我们在这里显示,H2-M3限制的记忆CD8〜+ T细胞能够进行二次扩增,但是与原H2-M3限制的效应细胞相反,它无法提供保护性免疫。在1m免疫的小鼠中,MHC Ia类限制性记忆CD8 + T细胞通过限制树突状细胞抗原呈递而阻止了H2-M3限制性记忆T细胞群的扩增。因此,H2-M3限制的T细胞的保护性免疫仅限于原发感染,表明记忆MHC Ia类限制的T细胞可防止继发感染期间不必要的免疫反应。

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