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

Th17 cell-derived IL-17 is dispensable for B cell antibody production.
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DOI:
10.1016/j.cyto.2012.03.018
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发表时间:
2012-07
期刊:
影响因子:
3.8
通讯作者:
Nakae, Susumu
Nakae, Susumu
中科院分区:
医学3区
文献类型:
--
作者:
Shibui, Akiko;Shimura, Eri;Nambu, Aya;Yamaguchi, Sachiko;Leonard, Warren J.;Okumura, Ko;Sugano, Sumio;Sudo, Katsuko;Nakae, Susumu

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IL-17优先由Th 17细胞产生,对于宿主防御病原体是重要的,并且还参与自身免疫性和过敏性疾病的发展。在IL-17缺陷小鼠中,抗体(Ab)的产生被证明是受损的,这表明IL-17可能促进B细胞活化和直接分泌Ab。然而,IL-17在B细胞产生Ab中的确切作用仍不清楚。在本研究中,我们发现IL-17 R在小鼠脾B细胞中的组成型表达。然而,单独的IL-17、IL-17 F或IL-25不能诱导B细胞产生Ab,即使在存在激动性抗CD 40 Ab的情况下也是如此。IL-17也不能影响IFN-γ、IL-4或TGF-β1介导的IG类别转换。此外,在B细胞和IL-17−/− CD 4 + T细胞或IL-17−/− Th 17细胞的共培养物中,IL-17缺乏不影响体外B细胞的Ab产生,表明Th 17细胞衍生的IL-17不是体外通过T-B细胞相互作用产生B细胞Ab所必需的。因此,在体内,IL-17可通过增强其它免疫细胞产生B细胞激活剂而间接参与Ab产生。
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 cocultures 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-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.
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