Abstract
Background
Hepatitis C virus (HCV) affects glucose and lipid metabolism in vitro; however, it is unclear whether HCV infection is associated with insulin resistance and atherosclerosis at the population level. We aimed to investigate this association in a Japanese cohort of the Seven Countries Study, and our investigation was conducted in Tanushimaru, an HCV hyperendemic area.
Methods
A total of 1908 inhabitants of Tanushimaru were classified into 3 groups according to HCV infection status: those who were uninfected (n = 1780), those with transient infection (n = 88), and those with chronic infection (n = 40). Insulin resistance and atherosclerosis were evaluated by homeostasis model assessment for insulin resistance (HOMA-IR) and carotid intima–media thickness (IMT), respectively. Intergroup differences in variables were evaluated by age- and sex-matched multivariate regression analysis.
Results
Significant intergroup differences were seen in fasting glucose and insulin levels. The HOMA-IR value was significantly higher in the group with chronic infection than the values in the uninfected and transiently infected groups (3.0 ± 0.39 vs. 1.3 ± 0.03 vs. 1.5 ± 0.14; P < 0.001). In contrast, low-density lipoprotein (LDL)-cholesterol and triglyceride levels were significantly lower in the group with chronic infection than the levels in the other groups. IMT was reduced in the group with chronic infection, with a significant intergroup difference (0.67 ± 0.02 vs. 0.71 ± 0.003 vs. 0.72 ± 0.01 mm; P = 0.003).
Conclusions
This population-based study in an HCV hyperendemic area revealed that chronic HCV infection was associated with severe insulin resistance and with mild atherosclerosis, suggesting a unique characteristic of HCV-related metabolic abnormality.
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Abbreviations
- ALT:
-
Alanine aminotransferase
- ANCOVA:
-
Analysis of covariance
- ANOVA:
-
Analysis of variance
- APRI:
-
Aspartate aminotransferase to platelet ratio index
- AST:
-
Aspartate aminotransferase
- HCV:
-
Hepatitis C virus
- HDL:
-
High-density lipoprotein
- HOMA-IR:
-
Homeostasis model assessment for insulin resistance
- IBW:
-
Ideal body weight
- IMT:
-
Intima–media thickness
- LDL:
-
Low-density lipoprotein
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Acknowledgments
This study was supported, in part, by a Grant-in-Aid for Young Scientists (B) (No. 22790874 to T.K.) and a Grant-in-Aid for Scientific Research (C) (No. 21590865 to M.S.) from the Ministry of Education, Culture, Sports, Science and Technology of Japan; and by Health and Labour Sciences Research Grants for Research on Hepatitis from the Ministry of Health, Labour and Welfare of Japan.
Conflict of interest
Michio Sata received lecture fees from Chugai Pharmaceutical Co., Ltd. Takumi Kawaguchi and Michio Sata belongs to a department funded by donations from MSD K.K.
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Miyajima, I., Kawaguchi, T., Fukami, A. et al. Chronic HCV infection was associated with severe insulin resistance and mild atherosclerosis: a population-based study in an HCV hyperendemic area. J Gastroenterol 48, 93–100 (2013). https://doi.org/10.1007/s00535-012-0610-3
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DOI: https://doi.org/10.1007/s00535-012-0610-3