Basophils are required for the induction of Th2 immunity to haptens and peptide antigens.

Basophils are required for the induction of Th2 immunity to haptens and peptide antigens.
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DOI:
10.1038/ncomms2740
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发表时间:
2013
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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嗜碱性粒细胞和树突状细胞在Th2细胞向外源抗原暴露倾斜中的相对贡献尚不清楚。在这里,我们报告的能力,嗜碱性粒细胞诱导Th2极化后,表皮致敏与不同的抗原使用嗜碱性粒细胞有条件地耗尽BASTRECK转基因小鼠。嗜碱性粒细胞负责体内Th2向半抗原和肽抗原倾斜,而不是蛋白抗原。与此一致,嗜碱性粒细胞不能摄取或处理大量的卵清蛋白蛋白,但通过主要组织相容性复合物II类将卵清蛋白肽呈递给T细胞用于Th2分化。有趣的是,在树突状细胞存在下,嗜碱性粒细胞在卵清蛋白蛋白暴露后促进Th2偏斜。两者合计,我们的研究结果表明,嗜碱性粒细胞单独能够诱导Th2偏斜与半抗原和肽抗原,但需要树突状细胞诱导的Th2蛋白抗原后,表皮免疫。 树突状细胞和嗜碱性粒细胞都能影响辅助性T细胞2的诱导,但它们的作用的相对重要性仍不清楚。Otsuka等发现嗜碱性粒细胞向T细胞呈递半抗原和肽抗原,但在没有树突细胞的情况下不能呈递蛋白抗原。
The relative contributions of basophils and dendritic cells in Th2 skewing to foreign antigen exposure remain unclear. Here we report the ability of basophils to induce Th2 polarization upon epicutaneous sensitization with different antigens using basophil conditionally depleted Bas TRECK transgenic mice. Basophils are responsible for Th2 skewing to haptens and peptide antigens, but not protein antigens in vivo. Consistent with this, basophils cannot take up or process ovalbumin protein in significant quantities, but present ovalbumin peptide to T cells for Th2 differentiation via major histocompatibility complex class II. Intriguingly, basophils promote Th2 skewing upon ovalbumin protein exposure in the presence of dendritic cells. Taken together, our results suggest that basophils alone are able to induce Th2 skewing with haptens and peptide antigens but require dendritic cells for the induction of Th2 for protein antigens upon epicutaneous immunization. Both dendritic cells and basophils have been shown to influence T helper 2 cell induction, however the relative importance of their roles remains unclear. Otsuka et al. find that basophils present hapten and peptide antigens to T cells, but are unable to present protein antigens in the absence of dendritic cells.
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