Osmomechanical stress selectively regulates translocation of protein kinase C isoforms.

Osmomechanical stress selectively regulates translocation of protein kinase C isoforms.
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渗透机械应激选择性调节蛋白激酶 C 亚型的易位。

DOI:
10.1016/s0014-5793(03)00150-9
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发表时间:
2003
期刊:
影响因子:
3.5
通讯作者:
O'Neil,RG
O'Neil,RG
中科院分区:
生物学3区
文献类型:
--
作者:
Liu,X;Zhang,MIN;Peterson,LB;O'Neil,RG

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渗透机械应力导致细胞肿胀和许多细胞过程的激活/调节,可能通过选择性地调节蛋白激酶C(PKC)亚型从胞质溶胶到膜隔室的易位在细胞信号传导中起关键作用。肾上皮细胞组分的蛋白质印迹法证明了五种PKC亚型的表达。其中三种亚型(PKCα,PKC β,PKC β)在细胞暴露于渗透机械应力(低渗介质)时易位到膜部分。使用同种型特异性抗体对细胞进行免疫组织化学染色,进一步证明佛波酯敏感性同种型PKCα和PKC β易位至质膜和核周位点,反映了特异性效应途径调节的潜在初始步骤。事实上,PKC的选择性抑制表明PKCα在调节钙内流通道中的潜在作用。它的结论是,渗透机械应力诱导特定的PKC亚型的选择性易位,表现出渗透机械应力在选择性调节PKC依赖的信号通路的关键作用。
Osmomechanical stress, resulting in cell swelling and activation/regulation of numerous cellular processes, may play a critical role in cell signaling by selectively regulating translocation of protein kinase C (PKC) isoforms from cytosol to membrane compartments. Western blotting of renal epithelial cell fractions demonstrated the expression of five PKC isoforms. Three of these isoforms (PKCα, PKCϵ, PKCζ) translocated to the membrane fraction upon exposure of cells to osmomechanical stress (hypotonic medium). Immunohistochemical staining of cells using isoform-specific antibodies further demonstrated translocation of the phorbol ester-sensitive isoforms, PKCα and PKCϵ, to both the plasma membrane and perinuclear sites, reflecting potential initial steps in regulation of specific effector pathways. Indeed, selective inhibition of PKCs indicates a potential role for PKCα in modulating a calcium influx channel. It is concluded that osmomechanical stress induces selective translocation of specific PKC isoforms, demonstrating a key role of osmomechanical stress in selectively regulating PKC-dependent signaling pathways.
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