Hypothyroidism minimizes liver damage and improves survival in rats with thioacetamide induced fulminant hepatic failure

Hepatology : Official Journal of the American Association for the Study of Liver Diseases
R BruckZ Halpern

Abstract

Recent data from animal studies suggest that induced hypothyroidism prevents the hyperdynamic circulation in portal vein ligated rats, liver cirrhosis in rats chronically treated with thioacetamide (TAA), and immune-mediated acute liver injury induced in mice by concanavalin A. Therefore, the aim of this present study is to determine whether hypothyroidism would likewise prevent fulminant hepatic failure (FHF) in rats. FHF was induced by 3 consecutive ip injections of TAA (400 mg/kg) at 24-hour intervals. Hypothyroidism was induced in rats by either methimazole (MMI) or propylthiouracil (PTU) and surgical thyroidectomy and was confirmed by elevated serum thyroid stimulating hormone levels. Serum levels of liver enzymes, blood ammonia, and prothrombin time were significantly lower in all 3 groups of hypothyroid rats. The stage of hepatic encephalopathy (HE) and the survival rates were significantly improved in the hypothyroid rats (P < .01); the histologic examination of their livers showed less necrosis and inflammation (P < .01). In the hypothyroid rats, the serum levels of malondialdehyde 48 hours after thioacetamide (TAA) administration were lower than in control rats (P < .01). Exogenous supplementation of hypothyroid rats ...Continue Reading

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