Carbachol-induced desensitization of PLC-β pathway in rat myometrium: downregulation of Gqα/G11α.

Carbachol-induced desensitization of PLC-β pathway in rat myometrium: downregulation of Gqα/G11α.
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卡巴胆碱诱导大鼠子宫肌层 PLC-β 通路脱敏:Gqα/G11α 下调。

DOI:
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发表时间:
1998
期刊:
American Journal of Physiology - Cell Physiology
影响因子:
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通讯作者:
Z. Tanfin
Z. Tanfin
中科院分区:
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文献类型:
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作者:
S. Lajat;S. Harbon;Z. Tanfin

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在雌激素处理的大鼠肌层中,氨基苯酚通过刺激毒蕈碱受体- gq / g11 -磷脂酶C-β3 (PLC-β3)级联反应增加肌醇磷酸的生成。在肌醇磷酸的产生、PLC-β3向膜的易位和收缩方面,暴露于恰巴醇导致随后的毒蕈碱反应的快速和特异性(同源)衰减。耐火性伴随着膜毒蕈碱结合位点的减少和残留受体的解偶联状态。蛋白激酶C (PKC)改变了毒蕈碱受体的功能,并促进了最初的脱敏期。毒蕈碱耐受性的延迟期与PKC无关,与Gqα/G11α下调有关。阿托品未能诱导脱敏和Gqα/G11α下调,表明这两个事件都涉及受体的主动占用。长时间暴露于A[公式:见文]降低了随后的A[公式:见文]以及碳水化合物介导的肌醇磷酸反应,并同样诱导了Gqα/G11α的下调。数据表明,Gqα/G11α水平的下降是在其激活之后发生的,这可能是异种脱敏的原因。
In the estrogen-treated rat myometrium, carbachol increased the generation of inositol phosphates by stimulating the muscarinic receptor-Gq/G11-phospholipase C-β3 (PLC-β3) cascade. Exposure to carbachol resulted in a rapid and specific (homologous) attenuation of the subsequent muscarinic responses in terms of inositol phosphate production, PLC-β3 translocation to membrane, and contraction. Refractoriness was accompanied by a reduction of membrane muscarinic binding sites and an uncoupled state of residual receptors. Protein kinase C (PKC) altered the functionality of muscarinic receptors and contributed to the initial period of desensitization. A delayed phase of the muscarinic refractoriness was PKC independent and was associated with a downregulation of Gqα/G11α. Atropine failed to induce desensitization as well as Gqα/G11α downregulation, indicating that both events involve active occupancy of the receptor. Prolonged exposure to A[Formula: see text] reduced subsequent A[Formula: see text] as well as carbachol-mediated inositol phosphate responses and similarly induced downregulation of Gqα/G11α. Data suggest that a decrease in the level of Gqα/G11α is subsequent to its activation and may account for heterologous desensitization.
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