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Insulin preincubation effects on rat vessel contractile responses: role of the endothelium.

机译:胰岛素预培养对大鼠血管收缩反应的影响:内皮的作用。

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摘要

The effect of contractions elicited with ET1 and AVP after preincubating rat aortic and tail artery rings with a hyperinsulinemic dose (3 nM) of insulin were studied. Insulin preincubation (120 min), in the presence of 0.1 mM L-NAME, depressed contraction of aortic rings to 0.01 microM ET1 (132 +/- 6 vs. 161 +/- 9 mg/mm2 in control, n = 25; p < 0.05) and to 1 microM AVP (84 +/- 7 vs. 110 +/- 9 mg/mm2 in control, n = 16; p < 0.05), but did not modify 45Ca influx to the cell. Insulin-induced relaxation was inhibited by indomethacin 10 microM, an antagonist of prostaglandin synthesis, and also by blockade of insulin receptors with 30 microM genistein. A short insulin preincubation (15 min) did not modify ET1 contractions. In rat tail artery, insulin preincubation (120 min) increased the force developed by ET1 (847 +/- 45 vs. 596 +/- 99 mgF/mgW in controls, n = 14) by stimulating TXA2 release and/or actions. In summary, the present results suggest that endothelial factors are involved in both the vasoconstrictor and vasodilator effects of insulin on rat vessels.
机译:研究了用高胰岛素剂量(3 nM)的胰岛素预孵育大鼠主动脉和尾动脉环后,ET1和AVP引起的收缩作用。在存在0.1 mM L-NAME的条件下进行胰岛素预孵育(120分钟),主动脉环向0.01 microM ET1的收缩抑制(对照中132 +/- 6与161 +/- 9 mg / mm2,n = 25; p <0.05)和1 microM AVP(对照组为84 +/- 7 vs. 110 +/- 9 mg / mm2,n = 16; p <0.05),但并未改变细胞向45Ca的流入。吲哚美辛10 microM(前列腺素合成的拮抗剂)抑制胰岛素诱导的松弛,并用30 microM染料木黄酮阻断胰岛素受体。短暂的胰岛素预孵育(15分钟)不会改变ET1的收缩。在大鼠尾动脉中,胰岛素预温育(120分钟)通过刺激TXA2释放和/或作用,增加了ET1产生的力(对照组为847 +/- 45 vs. 596 +/- 99 mgF / mgW,n = 14)。总而言之,目前的结果表明,内皮因子参与了胰岛素对大鼠血管的血管收缩和血管扩张作用。

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