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Phosphatidic acid modulates G protein regulation of phospholipase C-beta(1) activity in membranes

机译:磷脂酸调节膜中磷脂酶C-beta(1)活性的G蛋白调节

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Regulation of G protein stimulated phospholipase C-beta(1) (PLC-beta(1)) activity by phosphatidic acid (PA) was determined in membranes. In cerebral cortical membranes, PLC-beta(1) is under dual regulation by G protein stimulatory and inhibitory mechanisms. PA stimulated basal activity and was synergistic with G protein activation in increasing PLC-beta(1) activity. Lysophosphatidic acid (LPA) also stimulated PLC-beta(1) activity, but was less effective then PA. PA stimulation of PLC-beta(1) activity was relatively independent of acyl chain length. PA decreased the Ca2+ dependence for G protein stimulation of PLC-beta(1) activity. PA modulated the dual G protein regulation of PLC-beta(1) activity, increasing stimulatory regulation and reducing inhibitory G protein regulation. The sensitivity to guanosine 5'-[gamma-thio]trisphosphate (GTP-gamma-S) and carbachol stimulation of PLC-beta1 activity was increased by PA. These results demonstrate that PA regulates both basal activity and G protein stimulation of PLC-beta(1) activity. The data indicates that PA regulates the PLC-beta(1) signaling pathway and thus may have an important role in the modulation of cell activation. (C) 2002 Elsevier Science Inc. All rights reserved. [References: 29]
机译:在膜中确定了由磷脂酸(PA)对G蛋白刺激的磷脂酶C-beta(1)(PLC-beta(1))活性的调节。在大脑皮膜中,PLC-beta(1)受G蛋白的刺激和抑制机制双重调控。 PA刺激基础活性,并与G蛋白活化协同作用,增加PLC-beta(1)活性。溶血磷脂酸(LPA)也刺激PLC-beta(1)活性,但效果不如PA。 PA-PLC(1)活性的PA刺激相对独立于酰基链长度。 PA降低了Ca2 +对PLC-beta(1)活性的G蛋白刺激的依赖性。 PA调节PLC-beta(1)活性的双重G蛋白调节,增加刺激性调节并减少抑制性G蛋白调节。 PA对鸟苷5'-γ-硫代三磷酸(GTP-γ-S)和卡巴胆碱刺激PLC-beta1活性的敏感性增加。这些结果表明,PA调节基础活性和PLC-beta(1)活动的G蛋白刺激。数据表明PA调节PLC-beta(1)信号通路,因此可能在细胞激活的调制中起重要作用。 (C)2002 Elsevier Science Inc.保留所有权利。 [参考:29]

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