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Distinct Phospholipase C-β Isozymes Mediate Lysophosphatidic Acid Receptor 1 Effects on Intestinal Epithelial Homeostasis and Wound Closure

机译:不同的磷脂酶C-β同工酶介导溶血磷脂酸受体1对肠上皮稳态和伤口闭合的影响。

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Maintenance of the epithelial barrier in the intestinal tract is necessary to protect the host from the hostile luminal environment. Phospholipase C-β (PLC-β) has been implicated to control myriad signaling cascades. However, the biological effects of selective PLC-β isozymes are poorly understood. We describe novel findings that lysophosphatidic acid (LPA) regulates PLC-β1 and PLC-β2 via two distinct pathways to enhance intestinal epithelial cell (IEC) proliferation and migration that facilitate wound closure and recovery of the intestinal epithelial barrier. LPA acting on the LPA1 receptor promotes IEC migration by facilitating the interaction of Gαq with PLC-β2. LPA-induced cell proliferation is PLC-β1 dependent and involves translocation of Gαq to the nucleus, where it interacts with PLC-β1 to induce cell cycle progression. An in vivo study using LPA1-deficient mice (Lpar1?/?) shows a decreased number of proliferating IECs and migration along the crypt-luminal axis. Additionally, LPA enhances migration and proliferation of IECs in an LPA1-dependent manner, and Lpar1?/? mice display defective mucosal wound repair that requires cell proliferation and migration. These findings delineate novel LPA1-dependent lipid signaling that facilitates mucosal wound repair via spatial targeting of distinct PLC-βs within the cell.
机译:必须维持肠道上皮屏障,以保护宿主免受有害的腔环境的侵害。磷脂酶C-β(PLC-β)与控制无数信号级联有关。然而,对选择性PLC-β同工酶的生物学作用了解甚少。我们描述了新发现,即溶血磷脂酸(LPA)通过两个不同的途径调节PLC-β1和PLC-β2,以增强肠上皮细胞(IEC)的增殖和迁移,从而促进伤口闭合和肠上皮屏障的恢复。作用于LPA 1 受体的LPA通过促进Gαq与PLC-β2的相互作用来促进IEC迁移。 LPA诱导的细胞增殖是PLC-β1依赖性的,涉及Gαq易位到细胞核,在细胞核中它与PLC-β1相互作用以诱导细胞周期进程。使用LPA 1 缺陷小鼠( Lpar1 ?/?)进行的体内研究表明,增殖的数量减少了IEC和沿隐腔轴线的迁移。此外,LPA以LPA 1 依赖性方式增强IEC的迁移和增殖,而 Lpar1 ?/?小鼠显示出的粘膜创面修复缺陷需要细胞增殖和迁移。这些发现描述了新的LPA 1 依赖性脂质信号传导,该信号传导通过细胞内不同PLC-β的空间靶向促进粘膜伤口修复。

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