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Hassall's corpuscles instruct dendritic cells to induce CD4(+)CD25(+) regulatory T cells in human thymus

机译:Hassall的小球指示树突状细胞诱导人胸腺中的CD4(+)CD25(+)调节性T细胞

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Hassall's corpuscles - first described in the human thymus over 150 years ago(1) - are groups of epithelial cells within the thymic medulla. The physical nature of these structures differs between mammalian species(2). Although Hassall's corpuscles have been proposed to act in both the removal of apoptotic thymocytes(3,4) and the maturation of developing thymocytes(5) within the thymus, the function of Hassall's corpuscles has remained an enigma. Here we report that human Hassall's corpuscles express thymic stromal lymphopoietin ( TSLP). Human TSLP activates thymic CD11c-positive dendritic cells to express high levels of CD80 and CD86. These TSLP-conditioned dendritic cells are then able to induce the proliferation and differentiation of CD4(+) CD8(-) CD25(-) thymic T cells into CD4(+) CD25(+) FOXP3(+) (forkhead box P3) regulatory T cells. This induction depends on peptide - major histocompatibility complex class II interactions, and the presence of CD80 and CD86, as well as interleukin 2. Immunohistochemistry studies reveal that CD25(+) CTLA4(+) (cytotoxic T-lymphocyte-associated protein 4) regulatory T cells associate in the thymic medulla with activated or mature dendritic cells and TSLP-expressing Hassall's corpuscles. These findings suggest that Hassall's corpuscles have a critical role in dendritic-cell-mediated secondary positive selection of medium-to-high affinity self-reactive T cells, leading to the generation of CD4(+) CD25(+) regulatory T cells within the thymus.
机译:Hassall的小体是150年前在人类胸腺中首次描述的(1),是胸腺髓质中的上皮细胞群。这些结构的物理性质在哺乳动物物种之间是不同的(2)。尽管已提出Hassall的小体在凋亡的胸腺细胞的去除(3,4)和胸腺中发育中的胸腺细胞的成熟(5)方面起作用,但Hassall的小体的功能仍然是一个谜。在这里,我们报告人类Hassall的小体表达胸腺基质淋巴细胞生成素(TSLP)。人TSLP激活胸腺CD11c阳性树突状细胞表达高水平的CD80和CD86。然后,这些TSLP条件树突状细胞能够诱导CD4(+)CD8(-)CD25(-)胸腺T细胞增殖和分化为CD4(+)CD25(+)FOXP3(+)(前叉框P3)调节T细胞。这种诱导取决于肽-主要组织相容性复合体II类相互作用,以及CD80和CD86以及白介素2的存在。免疫组织化学研究表明CD25(+)CTLA4(+)(细胞毒性T淋巴细胞相关蛋白4)具有调节作用T细胞在胸腺髓质中与活化的或成熟的树突状细胞以及表达TSLP的Hassall小球相关。这些发现表明,Hassall的小球在树突状细胞介导的中等至高亲和力自我反应性T细胞的次级阳性选择中起关键作用,导致CD4(+)CD25(+)调节性T细胞的产生。胸腺。

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