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Th17 cell-derived IL-17 is dispensable for B cell antibody production

机译:Th17细胞来源的IL-17可用于B细胞抗体生产

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摘要

IL-17, which is preferentially produced by Th17 cells, is important for host defense against pathogens and is also involved in the development of autoimmune and allergic disorders. Antibody (Ab) production was shown to be impaired in IL-17-deficient mice, suggesting that IL-17 may promote B cell activation and direct secretion of Ab. However, the precise role of IL-17 in Ab production by B cells remains unclear. In the present study, we found constitutive expression of IL-17R in murine splenic B cells. Nevertheless, IL-17, IL-17F or IL-25 alone could not induce Ab production by B cells even in the presence of agonistic anti-CD40 Ab. IL-17 also could not affect IFN-γ-, IL-4- or TGF-β1-mediated Ig class-switching. Furthermore, in co-cultures of B cells and IL-17 -/- CD4 + T cells or IL-17 -/- Th17 cells, IL-17 deficiency did not influence Ab production by B cells in vitro, suggesting that Th17 cell-derived IL-17 was not required for B cell Ab production through T cell-B cell interaction in vitro. Thus, in vivo, IL-17 may be indirectly involved in Ab production by enhancing production of B cell activator(s) by other immune cells.
机译:IL-17优先由Th17细胞产生,对宿主防御病原体很重要,并且还参与自身免疫和过敏性疾病的发展。已证明在IL-17缺陷型小鼠中抗体(Ab)的生产受到损害,这表明IL-17可能促进B细胞活化和Ab的直接分泌。然而,尚不清楚IL-17在B细胞产生Ab中的确切作用。在本研究中,我们发现IL-17R在鼠脾B细胞中的组成型表达。然而,即使在激动性抗CD40抗体的存在下,单独的IL-17,IL-17F或IL-25也不能诱导B细胞产生Ab。 IL-17也不会影响IFN-γ-,IL-4-或TGF-β1介导的Ig类转换。此外,在B细胞和IL-17-/-CD4 + T细胞或IL-17-/-Th17细胞的共培养物中,IL-17缺乏并不影响B细胞在体外的Ab产生,这表明Th17细胞体外通过T细胞-B细胞相互作用产生B细胞Ab不需要衍生的IL-17。因此,在体内,IL-17可通过增强其他免疫细胞的B细胞活化剂的产生而间接地参与Ab的产生。

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