Adenosine regulates a chloride channel via protein kinase C and a G protein in a rabbit cortical collecting duct cell line.

Adenosine regulates a chloride channel via protein kinase C and a G protein in a rabbit cortical collecting duct cell line.
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腺苷通过蛋白激酶 C 和 G 蛋白调节兔皮质集合管细胞系中的氯离子通道。

DOI:
10.1172/jci115662
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发表时间:
1992
期刊:
The Journal of clinical investigation
影响因子:
--
通讯作者:
Stanton,BA
Stanton,BA
中科院分区:
--
文献类型:
--
作者:
Schwiebert,EM;Karlson,KH;Friedman,PA;Dietl,P;Spielman,WS;Stanton,BA

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我们研究了305 pS的氯离子(Cl-)通道的腺苷的调节,在一个连续的细胞系来自兔皮质集合管(RCCT-28 A)的顶膜使用膜片钳技术。N6-环己基腺苷(CHA)刺激A1腺苷受体激活细胞贴附贴片中的通道。蛋白激酶C(PKC)的激活剂佛波醇12,13-双癸酸酯和1-油酰2-乙酰甘油模拟CHA的作用,而PKC抑制剂H7则阻断CHA的作用。A1腺苷受体的刺激也增加了二酰基甘油的产生,二酰基甘油是PKC的激活剂。外源性PKC加入到细胞质面的内面向外补丁也刺激氯通道。碱性磷酸酶逆转PKC激活。这些结果表明,A1腺苷受体的刺激激活305 pS的Cl-通道在顶端膜的磷酸化依赖性途径,涉及PKC。在以前的研究中,我们发现蛋白G α i-3激活305-pS Cl-通道(Schwiebert et al. 1990. 265:7725-7728)。因此,我们验证了PKC通过G蛋白依赖性途径激活通道的假设。在由内而外的贴片中,百日咳毒素阻断了通道的PKC激活。相反,H7并不阻止G蛋白激活通道。我们的结论是,腺苷激活305 pS的Cl-通道在RCCT-28 A细胞的顶膜由膜界定的途径,涉及A1腺苷受体,磷脂酶C,甘油二酯,蛋白激酶C,和G蛋白。因为我们在以前的研究中已经表明,这种Cl-通道参与了细胞肿胀后的调节性体积减少,缺血性细胞肿胀期间的腺苷释放可能会激活Cl-通道并恢复细胞体积。图片
We examined the regulation by adenosine of a 305-pS chloride (Cl-) channel in the apical membrane of a continuous cell line derived from rabbit cortical collecting duct (RCCT-28A) using the patch clamp technique. Stimulation of A1 adenosine receptors by N6-cyclohexyladenosine (CHA) activated the channel in cell-attached patches. Phorbol 12,13-didecanoate and 1-oleoyl 2-acetylglycerol, activators of protein kinase C (PKC), mimicked the effect of CHA, whereas the PKC inhibitor H7 blocked the action of CHA. Stimulation of A1 adenosine receptors also increased the production of diacylglycerol, an activator of PKC. Exogenous PKC added to the cytoplasmic face of inside-out patches also stimulated the Cl- channel. Alkaline phosphatase reversed PKC activation. These results show that stimulation of A1 adenosine receptors activates a 305-pS Cl-channel in the apical membrane by a phosphorylation-dependent pathway involving PKC. In previous studies, we showed that the protein G alpha i-3 activated the 305-pS Cl- channel (Schwiebert et al. 1990. J. Biol. Chem. 265:7725-7728). We, therefore, tested the hypothesis that PKC activates the channel by a G protein-dependent pathway. In inside-out patches, pertussis toxin blocked PKC activation of the channel. In contrast, H7 did not prevent G protein activation of the channel. We conclude that adenosine activates a 305-pS Cl- channel in the apical membrane of RCCT-28A cells by a membrane-delimited pathway involving an A1 adenosine receptor, phospholipase C, diacylglycerol, PKC, and a G protein. Because we have shown, in previous studies, that this Cl- channel participates in the regulatory volume decrease subsequent to cell swelling, adenosine release during ischemic cell swelling may activate the Cl-channel and restore cell volume.Images
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