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Nongenomic action of progesterone in rat aorta: Role of nitric oxide and prostaglandins

机译:孕酮在大鼠主动脉中的非基因组作用:一氧化氮和前列腺素的作用

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The mechanism of action of progesterone (Pg) on rat vascular tissue was investigated. We obtained evidence that 10-nM Pg inhibited platelet aggregation at 1-5 min. Previously, we reported that nitric oxide (NO) mediated this antiaggregatory effect. Rat aortic strips (RAS) NO synthase (NOS) activity in response to "in vitro" treatment with other sex steroids hormones was measured. The stimulatory action of Pg on NO production was Specific for ovarian hormones and depends on sex. The effect was nongenomic since cycloheximide did not suppress the increment in NO induced by Pg. Finally, see demonstrated that Pg (5 min) increased prostacyclin release (42-182% above control) in a dose-dependent manner ( 1 (.) 100 nM). Indeed, indomethacin (10 muM) completely suppressed the increment in citrulline levels induced by the hormone. These results suggest that Pg exerts a direct nongenomic action on rat aortic metabolism, which involves NOS and cyclooxygenase (COX) activation and a cross-talk between NO- and prostacyclin (PGI(2))-dependent pathways. (C) 2002 Elsevier Science Inc. All rights reserved. [References: 44]
机译:研究了孕酮(Pg)对大鼠血管组织的作用机理。我们获得的证据表明10-nM Pg在1-5分钟时抑制了血小板凝集。以前,我们报道一氧化氮(NO)介导这种抗聚集作用。测量了响应于其他性类固醇激素的“体外”治疗的大鼠主动脉条(RAS)NO合酶(NOS)活性。 Pg对NO产生的刺激作用对卵巢激素具有特异性,并取决于性别。由于环己酰亚胺不能抑制Pg诱导的NO的增加,因此这种作用不是基因组学的。最后,见证明Pg(5分钟)以剂量依赖性方式(1(。)100 nM)增加前列环素释放(比对照高42-182%)。确实,消炎痛(10μM)完全抑制了激素诱导的瓜氨酸水平的增加。这些结果表明,Pg对大鼠主动脉代谢具有直接的非基因组作用,涉及NOS和环氧合酶(COX)的活化以及NO和前列环素(PGI(2))依赖性途径之间的相互干扰。 (C)2002 Elsevier Science Inc.保留所有权利。 [参考:44]

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