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Identification of Bcl-6-dependent follicular helper NKT cells that provide cognate help for B cell responses

机译:鉴定Bcl-6依赖性卵泡辅助性NKT细胞,它们为B细胞反应提供相关帮助

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Lipid antigens trigger help from natural killer T cells (NKT cells) for B cells, and direct conjugation of lipid agonists to antigen profoundly augments antibody responses. Here we show that in vivo, NKT cells engaged in stable and prolonged cognate interactions with B cells and induced the formation of early germinal centers. Mouse and human NKT cells formed CXCR5+PD-11" follicular helper NKT cells (NKT_(FH) cells), and this process required expression of the transcriptional repressor Bcl-6, signaling via the coreceptor CD28 and interaction with B cells. NKT_(FH) cells provided direct cognate help to antigen-specific B cells that was dependent on interleukin 21 (IL-21). Unlike T cell-dependent germinal centers, those driven by NKT_(FH) cells did not generate long-lived plasma cells. Our results demonstrate the existence of a Bcl-6-dependent subset of NKT cells specialized in providing help to B cells.
机译:脂质抗原触发天然杀伤性T细胞(NKT细胞)对B细胞的帮助,脂质激动剂与抗原的直接缀合可大大增强抗体反应。在这里,我们显示,在体内,NKT细胞与B细胞进行稳定和长时间的同源相互作用,并诱导早期生发中心的形成。小鼠和人类NKT细胞形成CXCR5 + PD-11“卵泡辅助性NKT细胞(NKT_(FH)细胞),该过程需要转录阻遏物Bcl-6的表达,通过共受体CD28发出信号并与B细胞相互作用。 FH)细胞对依赖白介素21(IL-21)的抗原特异性B细胞提供直接的同源帮助,与T细胞依赖的生发中心不同,NKT_(FH)细胞驱动的那些不会产生长寿的浆细胞。我们的结果证明了专门为B细胞提供帮助的NKT细胞Bcl-6依赖性亚型的存在。

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