1. Rho-kinase inhibitor prevents hepatocyte damage in acute liver injury induced by carbon tetrachloride in rats
- Author
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Ikeda, Hitoshi, Kume, Yukio, Tejima, Kazuaki, Tomiya, Tomoaki, Nishikawa, Takako, Watanabe, Naoko, Ohtomo, Natsuko, Arai, Masahiro, Arai, Chihiro, Omata, Masao, Fujiwara, Kenji, and Yatomi, Yutaka
- Subjects
Protein kinases -- Physiological aspects ,Protein kinases -- Research ,Liver diseases -- Development and progression ,Liver diseases -- Prevention ,Liver diseases -- Research ,Apoptosis -- Prevention ,Liver cells -- Physiological aspects ,Biological sciences - Abstract
A protective effect of Rho-kinase inhibitor on various organ injuries is gaining attention. Regarding liver injury, Rho-kinase inhibitor is reported to prevent carbon tetrachloride ([CCl.sub.4])- or dimethylnitrosamine-induced liver fibrosis and hepatic ischemia-reperfusion injury in rats. Because Rho-kinase inhibitor not only improved liver fibrosis but also reduced serum alanine aminotransferase (ALT) level in [CCl.sub.4]-induced liver fibrosis, we wondered whether Rho-kinase inhibitor might exert a direct hepatocyte-protective effect. We examined this possibility in acute [CCl.sub.4] intoxication in rats. Rho-kinase inhibitor, HA-1077, reduced serum alanine ALT level in rats with acute liver injury induced by [CCl.sub.4] with the improvement of histological damage and the reduction of the number of apoptotic cells. In cultured rat hepatocytes in serum-free condition, HA-1077 reduced apoptosis evaluated by quantitative determination of cytoplasmic histone-associated DNA oligonucleosome fragments with the reduction of caspase-3 activity and the enhancement of Bcl-2 expression. HA-1077 stimulated phosphorylation of Akt, and wortmannin, an inhibitor of phosphatidylinositol 3-kinase (PI3-kinase)/Akt pathway, abrogated the reduction of hepatocyte apoptosis by HA-1077 in vitro. Furthermore, wortmannin abrogated the reduction of serum ALT level by HA-1077 in rats with acute liver injury induced by [CCl.sub.4], suggesting that the activation of PI3-kinase/Akt pathway may be involved in the hepatocyte-protective effect by Rho-kinase inhibitor in vivo. In conclusion, Rho-kinase inhibitor prevented hepatocyte damage in acute liver injury induced by [CCl.sub.4] in rats and merits consideration as a hepatocyte-protective agent in liver injury, considering its direct antiapoptotic effect on hepatocytes in vitro. HA-1077; fasudil; Y-27632; Rho
- Published
- 2007