2015, Number 3
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Ann Hepatol 2015; 14 (3)
The ability of 17 β-estradiol to attenuate intrahepatic vasoconstriction to endothelin-1 in female rats is lost in cirrhosis
Hsin-Ling H, Fa-Yauh L, Shao-Jung H, Sun-Sang W, I-Fang H, Hui-Chun H, Jing-Yi L, Han-Chieh L, Shou-Dong L
Language: English
References: 42
Page: 404-413
PDF size: 182.47 Kb.
ABSTRACT
Background and rationale. The control of Endothelin-1 (ET-1)-mediated intrahepatic vasoconstriction in
cirrhosis is beneficial for the alleviation of relevant complications. Cirrhosis is accompanied by hypogonadism
and altered sex hormone status. Besides, sex hormones have vasoactive effects, but it is unknown if
they influence vascular function in cirrhosis. This study aimed to investigate the roles of sex hormones in
hepatic vascular reactions to ET-1 in cirrhosis. Liver cirrhosis was induced in Spraque-Dawley male and female
rats with common bile duct ligation (BDL). Sham-operated (Sham) rats were controls. On the 43rd day
after operations, intrahepatic vascular concentration-response curves to ET-1 were obtained with the following
preincubatioins: 1) vehicle; 2) 17β-estradiol; 3) progesterone; 4) testosterone. Livers from sham and
BDL rats were dissected for real-time polymerase chain reaction analysis of estrogen, progesterone and
testosterone receptors.
Results. Compared with sham males perfused with vehicle, sham females presented
higher perfusion pressure changes to ET-1 which was reversed only by 17β-estradiol. In cirrhosis, compared
with males, 17β-estradiol no longer attenuated vascular responsiveness to ET-1 in females. In
females, BDL rats had lower hepatic estrogen receptor α(ERα) mRNA expression than that in sham rats.
Conclusions. The sham females showed a stronger intrahepatic vascular constrictive effect to ET-1 than
sham males, which could be reversed by 17β-estradiol. However, the influence of 17β-estradiol was lost in
cirrhotic females, which may be attributed, at least partly, to intrahepatic ERα down-regulation in females
with cirrhosis.
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