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- W2078889074 abstract "Retinoic acid (RA) supplementation suppresses ethanol-enhanced hepatocyte hyperproliferation in rats; however, little is known about the mechanism(s). Here, we investigated whether RA affects the protein kinase signaling pathways in the liver tissues of rats fed with a high dose of ethanol for a prolonged period of time (6 months). Results show that there were greater levels of phosphorylated Jun N-terminal kinase (JNK) and phosphorylated c-Jun protein, but not total JNK protein, in livers of ethanol-fed rats vs those of controls. Moreover, ethanol feeding to rats increased the levels of phosphorylated mitogen-activated protein kinase kinase-4 (MKK-4) and decreased the levels of mitogen-activated kinase phosphatase-1 (MKP-1) in liver tissue. However, hepatic levels of phosphorylated-p38 protein and total-p38 protein were not altered by the ethanol treatment. In contrast, all-trans-RA supplementation at two doses in ethanol-fed rats greatly attenuated the ethanol-induced hepatic phosphorylation of MKK-4, phosphorylated-JNK and c-Jun proteins. The level of MKP-1 was increased in ethanol-fed rats supplemented with all-trans-RA. Further, ethanol-induced hepatocyte hyperproliferation, measured by immunostaining for proliferating cell nuclear antigen, were markedly decreased by all-trans-RA supplementation. Interestingly, hepatic apoptosis in the liver of ethanol-fed rats after 6 months of treatment decreased significantly. This decrease of hepatic apoptosis in ethanol-fed rats was prevented by all-trans-RA supplementation in a dose-dependent manner. The results from these studies indicate that restoration of RA homeostasis is critical for the regulation of JNK-dependent signaling pathway and apoptosis in the liver of ethanol-fed rats." @default.
- W2078889074 created "2016-06-24" @default.
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- W2078889074 date "2002-02-27" @default.
- W2078889074 modified "2023-09-27" @default.
- W2078889074 title "Retinoic acid inhibits hepatic Jun N-terminal kinase-dependent signaling pathway in ethanol-fed rats" @default.
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- W2078889074 doi "https://doi.org/10.1038/sj.onc.1205023" @default.
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