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Role Of Toll-Like Receptor 2 Against Streptococcus Uberis Infection In Primary Mouse Mammary Epithelial Cells

文献类型： 外文期刊

作者： Wan, ZX; Wang, XD; Liu, M; Zuo, JK; Xu, YY; Han, XG; Vanhnaseng, P; Miao, JF

作者机构：

关键词： Streptococcus Uberis; Mouse Mammary Epithelial Cells; Toll-Like Receptor 2; Reactive Oxygen Species; Cytokines

期刊名称： INTERNATIONAL IMMUNOPHARMACOLOGY

ISSN： 1567-5769

年卷期： 2020 年 79 卷

页码：

收录情况： JCR（2021版）

摘要： Mammary epithelial cells (MECs) play an important role against Streptococcus uberis infection which is one of the main causes of bovine mastitis and a potential threat to human health. Toll-like receptors (TLRs) and their mediated signaling pathways are critical in both innate and infection responses, yet their roles in anti-S. uberis infection in MECs remains poorly defined. In this work we investigated the regulatory mechanisms of TLR2 in inflammatory responses, where WT and TLR2(-/-) mice were euthanized at 15-18 days gestation, and mammary gland tissues were collected aseptically. The mouse MECs (MMECs) were isolated by combined digestion with type I collagenase, hyaluronidase and trypsin. We challenged MMECs with S. uberis and quantified antioxidant capacity as well as reactive oxygen species (ROS), proinflammatory cytokines and cell damage at different times. The loss of TLR2 function in MMECs results in more serious cell damage, increased cell adhesion, and significantly decreased ROS and mitochondrial ROS (mROS) with bactericidal function in response to S. uberis infection. Moreover, it was observed that the antioxidant capacity declined, and the production of TLR2-mediated cytokines (except CXC ligand 15) also were reduced. We demonstrated that TLR2 can mediate cellular anti-infective processes in MMECs by regulating the production of ROS and mROS and the secretion of cytokines. The results suggest an unpredicted role of TLR2 in MMECs in response to S. uberis infection.

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