Endothelin-1 selectively contracts portal vein through both ETA and ETB receptors in isolated rabbit liver.

Endothelin-1 selectively contracts portal vein through both ETA and ETB receptors in isolated rabbit liver.
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在离体兔肝脏中,内皮素-1 通过 ETA 和 ETB 受体选择性收缩门静脉。

DOI:
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发表时间:
1997
影响因子:
--
通讯作者:
T. Miyahara
T. Miyahara
中科院分区:
--
文献类型:
--
作者:
H. ;T. Shibamoto;T. Miyahara

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用5%白蛋白-Krebs液经门静脉灌流离体兔肝脏,观察内皮素(ET)-1对肝血管阻力分布的收缩作用及其受体亚型。用双血管阻断压估算血管的正弦压力。基础门静脉阻力占总门肝静脉阻力的59%。静脉注射ET-1(0.05-5微克)后,循环灌流液中的终浓度为0.1-10 nM,门静脉阻力呈剂量依赖性增加,而肝静脉阻力在任何浓度下均无明显变化。这种肝血管收缩与肝脏重量减轻有关。从肝静脉向门静脉逆行灌流的肝脏证实了ET-1引起的选择性门静脉收缩。选择性ETA受体拮抗剂BQ-123(1微米)可显著减弱ET-1引起的肝血管收缩。ETB受体拮抗剂BQ-788(1微米)在ET-1浓度小于10 nM时也可减弱这种收缩作用。BQ-123和BQ-788联用比单独使用BQ-123更有效地抑制肝血管收缩。这些结果表明,ET-1选择性地通过ETA和ETB受体收缩门静脉,在白蛋白-Krebs灌流的兔肝脏中以ETA受体占优势。
We determined the constrictive effects of endothelin (ET)-1 on the hepatic vascular resistance distribution and the receptor subtype responsible for the effect in isolated rabbit livers perfused via the portal vein with 5% albumin-Krebs solution. The sinusoidal pressure was estimated using the double vascular occlusion pressure. The basal portal venous resistance comprised 59% of the total portal-hepatic venous resistance. In response to a bolus injection of ET-1 (0.05-5 micrograms), which led to a final concentration of 0.1-10 nM in the recirculating perfusate, the portal venous resistance increased in a dose-dependent manner, whereas the hepatic venous resistance did not change significantly at any concentration. This hepatic vasoconstriction was associated with liver weight loss. The selective portal venous constriction induced by ET-1 was confirmed in livers perfused retrogradely from the hepatic vein to the portal vein. The ET-1-induced hepatic vasoconstriction was significantly attenuated by the selective ETA receptor antagonist BQ-123 (1 microM). The ETB receptor antagonist BQ-788 (1 microM) also attenuated the constriction at ET-1 concentrations less than 10 nM. The combination of BQ-123 and BQ-788 tended to inhibit the hepatic vasoconstriction more effectively than BQ-123 alone. These results suggest that ET-1 selectively constricts the portal vein via both ETA and ETB receptors, with predominance of ETA receptor in isolated albumin-Krebs-perfused rabbit livers.
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