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Comparative Study
English Abstract
Journal Article
[Effects of hypoxia on phosphoinositide turnover and adenylate cyclase system in cultured endothelial cells].
By studying the effects of oxygen deficiency upon signal-transducing system it has been shown that in long hypobaric hypoxia activates PI-turnover in cultured human endothelial cells. The sensitivity of cells to histamine was decreased as well as the adenylate cyclase activity in membranes of this cells. The amount of beta-adrenoreceptors was not influenced significantly. Incubation of endothelial cells with histamine (10(-5) M) and phorbol ester (10(-9) M) = activator of protein kinase C within 1-2 h resulted in desensitization of cellular responses which can be seen not only as a disappearance of histamine-induced activation of PI-turnover but also as a decrease of beta-adrenoreceptor amount and adenylate cyclase activity. It seems that hypoxia may change the action of Ca-mobilizing hormones on PI-turnover and suppress adenylate cyclase in human endothelial cells. However the effects of hypoxia on signal-transducing systems in this cells are developed slower than those of Ca-mobilizing hormones.
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