Successful interferon therapy reverses enhanced hepatic iron accumulation and lipid peroxidation in chronic hepatitis C

Abstract

OBJECTIVES: Hepatic iron deposition has been reported in chronic hepatitis C (CH-C), and iron-induced lipid peroxidation may be involved in the pathogenesis of CH-C. The aims of the present study were: 1) to determine whether patients with CH-C have evidence of enhanced hepatic lipid peroxidation and to evaluate its relation to iron status, compared with that in patients with chronic hepatitis B (CH-B); and 2) to assess the effect of interferon (IFN) therapy on hepatic iron and lipid peroxidation. METHODS: In the liver biopsies of 40 patients with CH-C and 26 patients with CH-B, immunohistochemical detection of 4-hydroxy-2-nonenal (HNE)-protein adducts for evaluation of lipid peroxidation was performed, and hepatic iron status was biochemically and histologically assessed. In 16 CH-C patients with normal serum transaminases and undetectable serum HCV-RNA >6 months after the end of IFN treatment (responders) and in 11 nonresponders, hepatic HNE-protein adducts and siderosis were evaluated in pre- and posttreatment liver biopsies. RESULTS: Hepatocytic HNE-protein adducts and iron deposits were more abundant in the patients with CH-C than in those with CH-B. No correlation was found between the levels of hepatocytic HNE-protein adducts and hepatic iron status in either of the two groups. In the responders to IFN treatment for CH-C, hepatocytic HNE-protein adducts disappeared or attenuated with improvement of hepatic siderosis after the treatment, whereas IFN treatment did not improve hepatocytic expression of HNE-protein adducts and hepatic siderosis in the nonresponders. CONCLUSIONS: Patients with CH-C have evidence of enhanced hepatic iron accumulation and lipid peroxidation compared to those with CH-B. In CH-C, hepatic siderosis and lipid peroxidation are improved with successful IFN treatment. These results suggest that hepatic lipid peroxidation and iron may potentially play contributory roles in the pathogenesis of CH-C.