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Influence of cellular energy metabolism on contractions of porcine carotid artery smooth muscle.

机译:细胞能量代谢对猪颈动脉平滑肌收缩的影响。

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A number of cellular metabolites, including inorganic phosphate and ADP, have been proposed to regulate the contractions of smooth muscle. Hypothesizing that one of these would have a greater influence than the others, parallel experiments using tissue mechanics and (31)P-NMR allowed comparison of several metabolic components with the generation of force in porcine carotid artery smooth muscle during long-term contractions. P(i), ADP, ATP, PCr, free energy, pH, and free Mg(2+) were determined from phosphate spectra during a control-hypoxia-postcontrol sequence generated during K(+) stimulation by replacement of oxygen with nitrogen using either pyruvate or glucose as substrate. Both pH and free Mg(2+) were significantly lower in control pyruvate-supplied tissues than in glucose-supplied tissues. Mechanical experiments following the same protocol produced variations in force. The pyruvate series produced the greater range of mechanical and metabolic changes. Linear and logarithmic regression analysis found the order of correlation with force to be highest for P(i), followed by pH, free energy, PCr, ATP, ADP, and free Mg(2+). The results are consistent with models for the regulation of myosin ATPase by free phosphate inhibition. The results are inconsistent with models of ADP as a regulator of smooth muscle force. Perturbations which alter intracellular phosphate, such as creatine loading, may produce side effects on the contractions of vascular smooth muscle. Copyright 2000 S. Karger AG, Basel
机译:已经提出了许多细胞代谢产物,包括无机磷酸盐和ADP,以调节平滑肌的收缩。假设这些因素之一将比其他因素具有更大的影响,使用组织力学和(31)P-NMR进行的平行实验允许比较长期代谢过程中猪颈动脉平滑肌中几种代谢成分与力的产生。 P(i),ADP,ATP,PCr,自由能,pH和游离Mg(2+)是通过在K(+)刺激过程中产生的控制-缺氧-后控制序列中的磷酸盐光谱确定的,方法是使用氮气替换氧气丙酮酸或葡萄糖为底物。 pH和游离Mg(2+)在丙酮酸提供的对照组织中均显着低于葡萄糖提供的组织。遵循相同协议的机械实验会产生力的变化。丙酮酸系列产生更大范围的机械和代谢变化。线性和对数回归分析发现,P(i)与力的相关性顺序最高,其次是pH,自由能,PCr,ATP,ADP和游离Mg(2+)。结果与通过游离磷酸盐抑制调节肌球蛋白ATP酶的模型一致。结果与ADP作为平滑肌力调节剂的模型不一致。改变细胞内磷酸盐的摄动,例如肌酸负荷,可能对血管平滑肌的收缩产生副作用。版权所有2000 S. Karger AG,巴塞尔

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