Abstract
This study was aimed to investigate the molecular mechanisms underlying prevention of hepatic fibrosis by S-nitroso-N-acetylcysteine (SNAC), a nitric oxide donor that inhibits lipid peroxidation. Secondary biliary cirrhosis was induced by 4 weeks of common bile duct ligation (CBDL). Both sham-operated and CBDL animals received SNAC (6.0 μmol/kg/day) starting 2 weeks after surgery. SNAC treatment reduced the increase in blood enzyme activities (alanine aminotransferase, aspartate aminotransferase, and alkaline phosphatase), induced by CBDL. Histological changes were attenuated and there was a significant decrease in the area of liver fibrosis and in the activation of stellate cells measured by alpha-smooth muscle actin (α-SMA) immunostaining. The increase in TBARS concentration and hydroperoxide-induced chemiluminescence were also reduced by SNAC treatment. SNAC down-regulated expression of collagen 1α, α-SMA, tumor necrosis factor-α, tumor growth factor-β, metalloproteinase-2, metalloproteinase inhibitor 1, platelet-derived growth factor (PDGF), and PDGF receptor in CBDL rats. These effects were accompanied by inhibited activation of extracellular signal-regulated kinases, Jun amino-terminal kinases, p38 and Akt. Antifibrotic effects were more efficient than those of the free thiol NAC administered at a dose of 60 μmol/kg. In conclusion, results obtained indicate that SNAC, beyond its antioxidant capacity, exerts antifibrotic effects in rats with secondary biliary cirrhosis by down-regulating increased expression of genes and modulating intracellular signaling pathways that contribute to the accumulation of matrix proteins. Thus, SNAC may be an interesting candidate for the treatment of human fibrosis and cirrhosis.
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Acknowledgments
CIBERehd is funded by the “Instituto de Salud Carlos III”. This work was supported by grants from the Brazilian agencies “Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)”, “Fundo de Incentivo à Pesquisa e Eventos (FIPE) do Hospital de Clínicas de Porto Alegre (HCPA)”, and “Laboratório de Hepatologia e Fisiologia Experimental da Universidade Federal do Rio Grande do Sul (HCPA/UFRGS)”.
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Vercelino, R., Crespo, I., de Souza, G.F.P. et al. S-nitroso-N-acetylcysteine attenuates liver fibrosis in cirrhotic rats. J Mol Med 88, 401–411 (2010). https://doi.org/10.1007/s00109-009-0577-6
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DOI: https://doi.org/10.1007/s00109-009-0577-6