α-Lipoic acid inhibits liver fibrosis through the attenuation of ROS-triggered signaling in hepatic stellate cells activated by PDGF and TGF-β.

Ning-Ping Foo, Shu-Huei Lin, Yu-Hsuan Lee, Ming-Jiuan Wu, Ying-Jan Wang

Index: Toxicology 282(1-2) , 39-46, (2011)

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Abstract

Reactive oxygen species (ROS) have been implicated in hepatic stellate cell activation and liver fibrosis. We previously reported that α-lipoic acid (LA) and its reduced form dihydrolipoic acid (DHLA) inhibited toxicant-induced inflammation and ROS generation. In the present study, we further examined the effects of LA/DHLA on thioacetamide (TAA)-induced liver fibrosis in rats and the possible underlying mechanisms in hepatic stellate cells in vitro. We found that co-administration of LA to rats chronically treated with TAA inhibited the development of liver cirrhosis, as indicated by reductions in cirrhosis incidence, hepatic fibrosis, and AST/ALT activities. We also found that DHLA inhibited TGF-β/PDGF-stimulated HSC-T6 activation and ROS generation. These effects could be mediated by the MAPK and PI3K/Akt pathways. According to our current results, LA may have a beneficial role in the treatment of chronic liver diseases caused by ongoing hepatic damage.Copyright © 2011 Elsevier Ireland Ltd. All rights reserved.