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B淋巴细胞活化分子事件及相关病理机制

DOI: 10.1360/052014-145, PP. 985-998

Keywords: B细胞受体,免疫突触,免疫成像,滋养信号,超分子激活聚簇体

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Abstract:

B细胞是体液免疫的重要执行细胞,其活化是机体产生保护性抗体的关键步骤.目前人们对B细胞早期活化的动态分子事件和信号起始机制等仍然未知.本文将重点总结超高清成像技术和高速高分辨率活体成像技术在B细胞领域的应用,这些研究将帮助人们理解B细胞早期活化的机制.本文系列总结了静息态下维持B细胞存活的B细胞受体(Bcellreceptor,BCR)滋养信号的研究进展,并提出了滋养信号来源的几种可能的模型.描述了抗原刺激导致的BCR活化的信号通路,并重点探讨了成像技术进步带来的关于BCR信号通路起始的机制探索这一免疫学领域的重大问题.结合高速高分辨率活细胞成像技术在免疫学领域的应用,抗原刺激后BCR活化过程中一系列动态变化过程和高级结构的形成能够被实时捕获.此外,还探讨了B细胞记忆性免疫发生的机制,重点阐述了亲和力成熟和BCR亚型转换,尤其是IgG(ImmunoglobulinG)型BCR胞内尾巴对快速强烈的记忆性免疫反应的帮助.B细胞活化机制的调节过程发生异常会破坏正常的B细胞稳态平衡和免疫疾病的发生,本文总结抑制性调节受体FcγRIIB(FcγreceptorIIB)突变与自身免疫病的关系,以及BCR信号通路信号分子突变与B细胞肿瘤的关系,这些研究将加深人们对B细胞免疫疾病的认识和相应医疗手段的改进.

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