Resveratrol mitigate structural changes and hepatic stellate cell activation in N'-nitrosodimethylamine-induced liver fibrosis via restraining oxidative damage

Chem Biol Interact. 2014 Sep 25:221:1-12. doi: 10.1016/j.cbi.2014.07.007. Epub 2014 Jul 24.

Abstract

Resveratrol, a polyphenol, found in skin of red grapes, peanuts and berries possesses anti-inflammatory, anti-carcinogenic and lipid modulation properties. Here, we demonstrate in vivo antifibrotic activity of resveratrol in a mammalian model, wherein hepatic fibrosis was induced by N'-nitrosodimethylamine (NDMA) administration. Apart from being a potent hepatotoxin, NDMA is a known mutagen and carcinogen, as well. To induce hepatic fibrosis, rats were administered NDMA (i.p.) in 10mg/kgb.wt thrice/week for 21 days. Another group of animals received resveratrol supplement (10mg/kgb.wt) subsequent to NDMA administration and were sacrificed weekly. The changes in selected biomarkers were monitored to compare profibrotic effects of NDMA and antifibrotic activity of resveratrol. The selected biomarkers were: sera transaminases, ALP, bilirubin, liver glycogen, LPO, SOD, protein carbonyl content, ATPases (Ca(2+), Mg(2+), Na(+)/K(+)) and hydroxyproline/collagen content. Alterations in liver architecture were assessed by H&E, Masson's trichrome and reticulin staining of liver biopsies. Immuno-histochemistry and immunoblotting were employed to examine expression of α-SMA. Our results demonstrate that during NDMA-induced liver fibrosis transaminases, ALP, bilirubin, hydroxyproline and liver collagen increases, while liver glycogen is depleted. The decline in SOD (>65%) and ATPases, which were concomitant with the elevation in MDA and protein carbonyls, strongly indicate oxidative damage. Fibrotic transformation of liver in NDMA-treated rats was verified by histopathology, immuno-histochemistry and immunoblotting data, with the higher expressivity of α-SMA-positive HSCs being most established diagnostic immuno-histochemical marker of HSCs. Resveratrol-supplement refurbished liver architecture by significantly restoring levels of biomarkers of oxidative damage (MDA, SOD, protein carbonyls and membrane-bound ATPases). Therefore, we conclude that antifibrotic effect of resveratrol is due to restrained oxidative damage and down-regulation of α-SMA, which inhibits HSC activation to obstruct liver fibrosis.

Keywords: ATPases; Liver fibrosis; N′-Nitrosodimethylamine; Oxidative damage; Resveratrol; α-Smooth muscle actin.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Anti-Inflammatory Agents, Non-Steroidal / pharmacology
  • Anti-Inflammatory Agents, Non-Steroidal / therapeutic use
  • Blotting, Western
  • Dimethylnitrosamine*
  • Electrophoresis, Gel, Two-Dimensional
  • Hepatic Stellate Cells / drug effects*
  • Liver Cirrhosis / chemically induced*
  • Liver Cirrhosis / drug therapy
  • Male
  • Oxidative Stress / drug effects*
  • Rats
  • Resveratrol
  • Stilbenes / pharmacology*
  • Stilbenes / therapeutic use

Substances

  • Anti-Inflammatory Agents, Non-Steroidal
  • Stilbenes
  • Dimethylnitrosamine
  • Resveratrol