首页> 外文期刊>Journal of Cellular Physiology >Discoidin domain receptor 1 activation suppresses alpha2beta1 integrin-dependent cell spreading through inhibition of Cdc42 activity.
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Discoidin domain receptor 1 activation suppresses alpha2beta1 integrin-dependent cell spreading through inhibition of Cdc42 activity.

机译:Discoidin域受体1激活抑制alpha2beta1 integrin-dependent细胞扩散通过抑制Cdc42活动。

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摘要

Upregulation and overexpression of discoidin domain receptor 1 (DDR1) have been implied in the regulation of kidney development and progression of cancers. Our previous studies with Mardin-Darby canine kidney (MDCK) cells showed that overexpression of DDR1 inhibited cell spreading, whereas dominant negative DDR1 promoted cell spreading on collagen-coated dish. Cell spreading is an important characteristic for cell differentiation and survival. However, little is known about the molecular mechanisms underlying the role of DDR1 in cell spreading. We have found here a novel signaling pathway of DDR1 consisting of Cdc42 that regulates the assembly and disassembly of cytoskeleton and cell spreading in MDCK cells. Cell spreading involves the organization of cytoskeleton that is mainly regulated by Rho-family GTPases. We assessed the activity of Rho-family GTPases and transfected MDCK cells with constitutively active or dominant negative GTPases, and quantified the extent of cell spreading. These results showed that DDR1 decreased the filamentous actin ratio and Rac1/Cdc42 activities, but had no effects on RhoA activity. Neither constitutively active nor dominant negative Rac1 altered DDR1-inhibited cell spreading. Constitutively active Cdc42 could rescue the DDR1-inhibited cell spreading, whereas dominant negative Cdc42 inhibited cell spreading, indicating that DDR1-inhibited cell spreading is Cdc42 dependent. With the use of alpha(2)beta(1) integrin blocking antibody, we showed that collagen-induced Cdc42 activation was mediated by alpha(2)beta(1) integrin. Moreover, ectopic FAK expression enhanced the Cdc42 activity. Reducing FAK activity by dominant negative FAK (FRNK) markedly abolished the Cdc42 activity. These findings show that DDR1a/b activation inhibits cell spreading through suppressing alpha(2)beta(1) integrin-mediated Cdc42 activation.
机译:Upregulation discoidin超表达域受体1 (DDR1)一直在暗示调节肾脏发展和进展的癌症。Mardin-Darby狗肾细胞(MDCK)显示超表达DDR1的抑制细胞传播,而占主导地位的消极DDR1促进细胞传播collagen-coated菜。细胞传播的一个重要特征细胞分化和生存。是知之甚少的分子机制底层DDR1的角色在细胞扩散。在这里找到一个新的信号通路DDR1吗组成的Cdc42调节组装和细胞骨架和细胞拆卸在MDCK细胞扩散。主要是细胞骨架的组织受Rho-family gtpase。活动Rho-family gtpase和转染MDCK细胞持续活跃或占主导地位- gtpase,量化的程度细胞扩散。减少和丝状肌动蛋白的比例Rac1 / Cdc42活动,但对RhoA没有影响活动。占主导地位的消极Rac1 DDR1-inhibited改变细胞扩散。拯救DDR1-inhibited细胞传播,而占主导地位的消极Cdc42抑制细胞传播,表明DDR1-inhibited细胞扩散Cdc42依赖。整合素抑制性抗体,我们显示胶原诱导Cdc42激活介导的整合素α(2)β(1)。表达增强Cdc42活动。FAK活动占主导地位的消极FAK (FRNK)明显废除Cdc42活动。结果表明,DDR1a / b激活抑制通过抑制细胞扩散α(2)β(1)integrin-mediated Cdc42激活。

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