TGF‐β1 reduces the differentiation of porcine IgA‐producing plasma cells by inducing IgM+ B cells apoptosis via Bax/Bcl2‐Caspase3 pathway

细胞凋亡 转化生长因子 细胞生物学 化学 生物 分子生物学 分泌物 免疫学 内分泌学 生物化学
作者
Caiying Wang,Shanshan Yang,Xin Huang,Yabin Lü,Yue Zhang,M. Li,Jing Zhao,S Li,H.F.J. Savelkoul,Christine A. Jansen,Guangliang Liu
出处
期刊:The FASEB Journal [Wiley]
卷期号:37 (10)
标识
DOI:10.1096/fj.202300824rr
摘要

Transforming growth factor β1 (TGF-β1) performs a critical role in maintaining homeostasis of intestinal mucosa regulation and controls the survival, proliferation, and differentiation of many immune cells. In this study, we discovered that the infection of porcine epidemic diarrhea virus (PEDV), a coronavirus, upregulated TGF-β1 expression via activating Tregs. Besides, recombinant porcine TGF-β1 decreased the percentage of CD21+ B cells within the lymphocyte population in vitro. We further found that TGF-β1 reduced the IgA-secreting B cell numbers and also inhibited plasma cell differentiation. Additional investigations revealed that TGF-β1 induced the apoptosis of IgM+ B cells in both peyer's patches (PPs) and peripheral blood (PB) through the activation of the Bax/Bcl2-Caspase3 pathway. Conversely, the application of the TGF-β1 signaling inhibitor SB431542 significantly antagonized the TGF-β1-induced reduction of IgA secretion and B cell apoptosis and restored plasma cell differentiation. Collectively, TGF-β1 plays an important role in regulating the survival and differentiation of porcine IgA-secreting B cells through the classical mitochondrial apoptosis pathway. These findings will facilitate future mucosal vaccine designs that target the regulation of TGF-β1 for the control of enteric pathogens in the pig industry.
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