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Hemodynamic and hormonal effects of human ghrelin in healthy volunteers.

机译:人生长激素释放肽对健康志愿者的血流动力学和激素作用。

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摘要

To investigate hemodynamic and hormonal effects of ghrelin, a novel growth hormone (GH)-releasing peptide, we gave six healthy men an intravenous bolus of human ghrelin (10 microg/kg) or placebo and vice versa 1-2 wk apart in a randomized fashion. Ghrelin elicited a marked increase in circulating GH (15-fold). The elevation of GH lasted longer than 60 min after the bolus injection. Injection of ghrelin significantly decreased mean arterial pressure (-12 mmHg, P < 0.05) without a significant change in heart rate (-4 beats/min, P = 0.39). Ghrelin significantly increased cardiac index (+16%, P < 0.05) and stroke volume index (+22%, P < 0.05). We also examined ghrelin receptor [GH secretagogues receptor (GHS-R)] gene expression in the aortas, the left ventricles, and the left atria of rats by RT-PCR. GHS-R mRNA was detectable in the rat aortas, left ventricles, and left atria, suggesting that ghrelin may cause cardiovascular effects through GH-independent mechanisms. In summary, human ghrelin elicited a potent, long-lasting GH release and had beneficial hemodynamic effects via reducing cardiac afterload and increasing cardiac output without an increase in heart rate.
机译:为了研究生长素释放肽(一种新的生长激素(GH)释放肽)的血流动力学和激素作用,我们随机分配了六名健康男人静脉注射人生长素释放肽(10 microg / kg)或安慰剂,反之亦然,间隔1-2周时尚。 Ghrelin引起循环GH的显着增加(15倍)。推注后GH的升高持续超过60分钟。注射生长激素释放肽可显着降低平均动脉压(-12 mmHg,P <0.05),而心率无明显变化(-4次/分钟,P = 0.39)。 Ghrelin显着增加心脏指数(+ 16%,P <0.05)和中风量指数(+ 22%,P <0.05)。我们还通过RT-PCR检查了大鼠主动脉,左心室和左心房中的生长素释放肽受体[GH促分泌素受体(GHS-R)]基因表达。在大鼠主动脉,左心室和左心房中均可检测到GHS-R mRNA,这表明ghrelin可能通过不依赖GH的机制引起心血管效应。总之,人生长素释放肽引起有效的,持久的GH释放,并通过减少心脏后负荷和增加心输出量而不增加心率而具有有益的血液动力学作用。

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