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A High Throughput MHC II Binding Assay for Quantitative Analysis of Peptide Epitopes

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通过MHCII路径处理和呈现多糖

Brian A Cobb¹, Qun Wang, Arthur O Tzianabos

¹Channing Laboratory, Department of Medicine, Brigham & Women's Hospital, Boston, MA 02115, USA.

|May 28, 2004

概括

紫多糖 (ZPSs) 通过MHCII类通路进行处理和呈现,从而激活CD4 ((+) T细胞. 这一发现挑战了碳水化合物免疫反应和T细胞激活的传统观点.

科学领域:

免疫学免疫学免疫学
分子生物学分子生物学
微生物学微生物学

背景情况:

适应性免疫依赖于抗原呈现细胞 (APC) 和T细胞.
甲类MHC向CD8(+) T细胞呈现细胞内;乙类MHC向CD4(+) T细胞呈现细胞外.
人们认为碳水化合物可以引起独立于T细胞的免疫反应.

研究的目的:

为了研究zwitterionic多糖化合物 (ZPSs) 激活CD4 ((+)) T细胞的机制.
探索MHCII类途径在ZPS介导的T细胞激活中的作用.

主要方法:

通过氧化介导机制对ZPS加工的分析.
通过MHCII类内细胞通路对T细胞呈现ZPS的研究.
在APC中检查碳水化合物与MHCII类结合的情况.

主要成果:

酸多糖 (ZPSs) 被加工成低分子量碳水化合物.
这些加工的碳水化合物通过MHCII类内细胞通路向T细胞呈现.
来自ZPSs的碳水化合物与APC中的MHCII类分子结合.

结论:

ZPSs可以激活CD4 (((+) T细胞,表现出T细胞依赖的免疫反应.
这种激活通过MHCII类途径发生,这是碳水化合物呈现的新机制.
这些发现表明,理解碳水化合物如何通过T细胞激活来调节免疫反应的范式转变.

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