Ethanol's Effects on Cortical Adenylate Cyclase Activity

Ethanol's Effects on Cortical Adenylate Cyclase Activity
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乙醇对皮质腺苷酸环化酶活性的影响

DOI:
10.1111/j.1471-4159.1985.tb08722.x
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发表时间:
1985
影响因子:
4.7
通讯作者:
B. Tabakoff
B. Tabakoff
中科院分区:
医学2区
文献类型:
--
作者:
T. Saito;John M. Lee;B. Tabakoff

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摘要:研究了乙醇对小鼠大脑皮层β-肾上腺素能受体偶联腺苷酸环化酶(AC)的影响。向含有皮质膜的培养混合物中添加乙醇 (20–500 mM) 表明乙醇可以增加 AC 活性并增强鸟苷酰亚胺二磷酸 [Gpp(NH)p] 对 AC 活性的刺激作用。乙醇增加了鸟嘌呤核苷酸激活 AC 的速率,同时降低了实现皮质 AC 最大刺激所需的镁的 EC50。乙醇也改变了 Gpp(NH)p 和异丙肾上腺素刺激 AC 活性的 EC50 值。乙醇能够刺激使用洋地黄皂苷提取的AC。洋地黄皂苷提取物中的 AC 活性不再对 Gpp(NH)p 或 NaF 的添加敏感,但仍会受到乙醇的刺激。我们提出了乙醇刺激皮质 AC 活性的多个作用位点。这些位点包括 β-肾上腺素能受体、G/F 偶联蛋白和皮质 AC 催化单元的作用。将乙醇对皮质 β 受体耦合 AC 活性的作用与先前报道的乙醇对纹状体多巴胺 (DA) 敏感的 AC 的作用进行比较,表明这两种 AC 系统对乙醇的敏感性不同。这些差异可能是由纹状体和皮质 AC 系统的特定耦合特性或纹状体和皮质 AC 系统所在质膜的差异决定的。
Abstract: The effects of ethanol on β‐adrenergic receptor‐coupled adenylate cyclase (AC) of mouse cerebral cortex were examined. The addition of ethanol (20–500 mM) to incubation mixtures containing cortical membranes demonstrated that ethanol could increase AC activity and potentiate the stimulatory effects of guanylylimidodiphosphate [Gpp(NH)p] on AC activity. Ethanol increased the rate of activation of AC by guanine nucleotides and concomitantly decreased the EC50 for magnesium required to achieve maximal stimulation of cortical AC. The EC50 values for Gpp(NH)p and isoproterenol stimulation of AC activity were also altered by ethanol. Ethanol was capable of stimulating AC extracted by use of digitonin. The AC activity in the digitonin extract was no longer sensitive to the addition of Gpp(NH)p or NaF, but was still stimulated by ethanol. We propose multiple sites of action for ethanol in stimulating cortical AC activity. These sites include actions at the β‐adrenergic receptor, at the G/F coupling proteins, and at the catalytic unit of cortical AC. Comparison of ethanol's actions on cortical β receptor coupled AC activity with prior reported actions of ethanol on striatal dopamine (DA)‐sensitive AC indicated differential sensitivities of these two AC systems to ethanol. These differences may be determined by specific coupling characteristics of the striatal and cortical AC systems or by differences in the plasma membranes in which striatal and cortical AC systems are located.
DOI: --
发表时间: 1982
期刊: The Journal of biological chemistry
影响因子: --
作者:
Somkuti,SG;Hildebrandt,JD;Herberg,JT;Iyengar,R
通讯作者: Iyengar,R
DOI: --
发表时间: 1983
期刊: The Journal of biological chemistry
影响因子: --
作者:
Northup,JK;Smigel,MD;Sternweis,PC;Gilman,AG
通讯作者: Gilman,AG
DOI: --
发表时间: 1984
期刊: The Journal of biological chemistry
影响因子: --
作者:
Katada,T;Bokoch,GM;Northup,JK;Ui,M;Gilman,AG
通讯作者: Gilman,AG
醇类激活腺苷酸环化酶需要核苷酸结合蛋白。
DOI: --
发表时间: 1984
期刊: The Journal of pharmacology and experimental therapeutics
影响因子: --
作者:
Luthin,GR;Tabakoff,B
通讯作者: Tabakoff,B
DOI: --
发表时间: 1983
期刊: The Journal of biological chemistry
影响因子: --
作者:
Northup,JK;Sternweis,PC;Gilman,AG
通讯作者: Gilman,AG