Impact of amino acid substitutions in hepatitis C virus genotype 1b core region on liver steatosis and glucose tolerance in non-cirrhotic patients without overt diabetes

Yoshio Sumida, Kazuyuki Kanemasa, Tasuku Hara, Yutaka Inada, Kyoko Sakai, Shunsuke Imai, Naohisa Yoshida, Kohichiroh Yasui, Yoshito Itoh, Takeshi Okanoue, Toshikazu Yoshikawa
Journal of Gastroenterology and Hepatology 2011, 26 (5): 836-42

BACKGROUND AND AIM: The hepatitis C virus (HCV) core protein induces hepatic steatosis and glucose intolerance in transgenic mice. The aim of this study was to clarify the impact of mutations in the HCV core region on hepatic steatosis and glucose tolerance in patients with chronic hepatitis C.

METHODS: Seventy-four Japanese patients (27 men, 47 women; mean age, 61.9 years) infected with HCV 1b with high viral load (>5 log IU/ml), without cirrhosis and overt diabetes, were enrolled. Substitutions in amino acids 70 and 91 of the HCV genotype 1b core region, the percentage of hepatic steatosis by liver histology, and glucose tolerance evaluated by the oral glucose tolerance test were investigated in all patients.

RESULTS: Steatosis was observed in 40 patients (54%). Transaminase activities, γ-glutamyl-transpeptidase, serum ferritin levels, homeostasis model assessment of insulin resistance index, and substitutions of amino acid 70 were significantly associated with the presence of steatosis, upon univariate analysis. Glucose intolerance was more prevalent in patients with steatosis (63%) than in those without steatosis (32%, P = 0.012). Multivariate analysis showed that substitution of amino acid 70 (odds ratio: 4.924; 95% confidence interval: 1.442-16.815; P = 0.014) and glucose intolerance (odds ratio: 3.369; 95% confidence interval: 1.076-10.544; P = 0.040) were independent factors related to liver steatosis. Levels of plasma glucose and serum insulin after glucose load were similar between patients with and without substitutions of amino acids 70 and 91.

CONCLUSIONS: Amino acid substitutions in the HCV genotype 1b core region are associated with hepatic steatosis in patients with chronic hepatitis C, independent of glucose intolerance.

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