Hepatic microvascular dysfunction during evolution of dietary steatohepatitis in mice

Hepatology : Official Journal of the American Association for the Study of Liver Diseases
Robert S McCuskeyGeoffrey C Farrell

Abstract

In alcoholic steatohepatitis, hepatic microvascular changes have pathogenic significance for hepatocellular function, perisinusoidal fibrosis, and portal hypertension. It is unclear whether similar changes occur in other forms of steatohepatitis. We therefore examined whether hepatic microvascular dysfunction occurs in fibrosing steatohepatitis induced by feeding mice a high-fat methionine- and choline-deficient (MCD) diet. Using in vivo microscopic--as well as histological and electron microscopic--methods, together with measurements of alanine aminotransferase (ALT), lipid content, and oxidative stress, hepatic microvascular structure and function were studied in relation to inflammatory and fibrotic changes during evolution of steatohepatitis. At 3 weeks of MCD diet intake, serum ALT was elevated and hepatic steatosis was pronounced. By 5 weeks, necroinflammatory change was noteworthy, and by 8 weeks perisinusoidal fibrosis was established. Compared with mice receiving the high-fat diet supplemented with methionine and choline (controls), levels of hepatic lipid and lipoperoxides were elevated at 3 weeks and beyond. The numbers of perfused sinusoids were significantly reduced at each time point. Enlarged, fat-laden hepatocyt...Continue Reading

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