TY - JOUR
T1 - Rho/Rho kinase is a key enzyme system involved in the angiotensin II signaling pathway of liver fibrosis and steatosis
AU - Kitamura, Kumi
AU - Tada, Shinichiro
AU - Nakamoto, Nobuhiro
AU - Toda, Kyoko
AU - Horikawa, Hitomi
AU - Kurita, Satoshi
AU - Tsunematsu, Satoshi
AU - Kumagai, Naoki
AU - Ishii, Hiromasa
AU - Saito, Hidetsugu
AU - Hibi, Toshifumi
PY - 2007/11
Y1 - 2007/11
N2 - Background and Aim: The molecular mechanisms underlying the involvement of the renin-angiotensin system in hepatic fibrosis are unclear. Recently, it was reported that a Rho kinase inhibitor prevented fibrosis of various tissues and that the Rho/Rho kinase pathway was involved in the renin-angiotensin system of vascular smooth muscle cells. In this study, the involvement of the Rho/Rho kinase pathway on angiotensin II signaling in liver fibrogenesis and generation of steatosis was investigated. Methods: Rats were fed a choline-deficient/L- amino acid-defined (CDAA) diet continuously and treated with a Rho kinase inhibitor, Y-27632, and an angiotensin II receptor blocker, TCV-116. Liver histology and hepatic stellate cell activation were analyzed. Free radical production was detected by 4-hydroxynonenal and 8-hydroxy-2′- deoxyguanosine immunostaining and the expression of tumor necrosis factor-α was examined. Isolated hepatic stellate cells were pretreated with a Rho kinase inhibitor, Y-27632, or an angiotensin II receptor blocker, CV-11974, and stimulated with angiotensin II, and mRNA expression of transforming growth factor-β and α-smooth muscle actin was analyzed. Results: Both the angiotensin II receptor blocker and the Rho kinase inhibitor improved fibrosis and steatosis of the liver in CDAA-fed rats. The increase in the number of hepatocytes positive for 4-hydroxynonenal and 8-hydroxy-2′- deoxyguanosine in CDAA-fed rats was significantly prevented by the angiotensin II receptor blocker and the Rho kinase inhibitor. The levels of tumor necrosis factor-α mRNA in the liver of CDAA-fed rats were significantly increased and this increase was significantly inhibited by treatment with the angiotensin II receptor blocker and the Rho kinase inhibitor. mRNA expression of transforming growth factor-β and α-smooth muscle actin stimulated by angiotensin II was also significantly suppressed by these two drugs. Conclusion: These results suggest that the Rho/Rho kinase pathway is at least partly involved in the renin-angiotensin system and plays an important role in hepatic fibrosis and steatosis.
AB - Background and Aim: The molecular mechanisms underlying the involvement of the renin-angiotensin system in hepatic fibrosis are unclear. Recently, it was reported that a Rho kinase inhibitor prevented fibrosis of various tissues and that the Rho/Rho kinase pathway was involved in the renin-angiotensin system of vascular smooth muscle cells. In this study, the involvement of the Rho/Rho kinase pathway on angiotensin II signaling in liver fibrogenesis and generation of steatosis was investigated. Methods: Rats were fed a choline-deficient/L- amino acid-defined (CDAA) diet continuously and treated with a Rho kinase inhibitor, Y-27632, and an angiotensin II receptor blocker, TCV-116. Liver histology and hepatic stellate cell activation were analyzed. Free radical production was detected by 4-hydroxynonenal and 8-hydroxy-2′- deoxyguanosine immunostaining and the expression of tumor necrosis factor-α was examined. Isolated hepatic stellate cells were pretreated with a Rho kinase inhibitor, Y-27632, or an angiotensin II receptor blocker, CV-11974, and stimulated with angiotensin II, and mRNA expression of transforming growth factor-β and α-smooth muscle actin was analyzed. Results: Both the angiotensin II receptor blocker and the Rho kinase inhibitor improved fibrosis and steatosis of the liver in CDAA-fed rats. The increase in the number of hepatocytes positive for 4-hydroxynonenal and 8-hydroxy-2′- deoxyguanosine in CDAA-fed rats was significantly prevented by the angiotensin II receptor blocker and the Rho kinase inhibitor. The levels of tumor necrosis factor-α mRNA in the liver of CDAA-fed rats were significantly increased and this increase was significantly inhibited by treatment with the angiotensin II receptor blocker and the Rho kinase inhibitor. mRNA expression of transforming growth factor-β and α-smooth muscle actin stimulated by angiotensin II was also significantly suppressed by these two drugs. Conclusion: These results suggest that the Rho/Rho kinase pathway is at least partly involved in the renin-angiotensin system and plays an important role in hepatic fibrosis and steatosis.
KW - Free radical
KW - Hepatic fibrosis
KW - Hepatic stellate cells
KW - Renin-angiotensin system
KW - Rho/Rho kinase system
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U2 - 10.1111/j.1440-1746.2006.04735.x
DO - 10.1111/j.1440-1746.2006.04735.x
M3 - Article
C2 - 17914985
AN - SCOPUS:34948841930
SN - 0815-9319
VL - 22
SP - 2022
EP - 2033
JO - Journal of Gastroenterology and Hepatology (Australia)
JF - Journal of Gastroenterology and Hepatology (Australia)
IS - 11
ER -