Abstract
Chronic infection with hepatitis C virus (HCV) can result in both hepatic and extrahepatic disease and endocrine dysfunction represents an important class of HCV-related extrahepatic disease. The most frequently occurring—and clinically important—of these endocrine disorders are thyroid disease and type 2 diabetes mellitus. In this Review, we evaluate the evidence in support of a link between HCV infection and endocrine-system dysfunction, and discuss potential pathophysiological mechanisms. A meta-analysis of the literature has revealed significant associations between chronic HCV infection, thyroid autoimmunity and hypothyroidism. Furthermore, a high prevalence of thyroid cancer has been reported in HCV-positive patients. Several clinicoepidemiological studies have demonstrated that chronic HCV infection could lead to the development of type 2 diabetes mellitus, possibly as a result of HCV-induced metabolic disturbances. Some researchers have postulated that a type 1 T-helper -cell mediated immune response underpins the association of chronic HCV infection with endocrine disease. Indeed, the available data suggest that a common immunological, type 1 T-helper cell pattern of cytokine expression and activation (via interferon-γ) could provide the pathophysiological basis for this association. Nonetheless, additional studies will be necessary to elucidate fully all the mechanisms involved in HCV-related endocrine dysfunction.
Key Points
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A high prevalence of autoimmune thyroid disorders and hypothyroidism has been reported in patients with chronic hepatitis C virus (HCV) infection
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Female sex is a risk factor for autoimmune thyroid disorders; female sex and thyroid peroxidase antibody positivity are major risk factors for hypothyroidism
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An increased prevalence of papillary thyroid cancer has been reported in HCV-positive patients with thyroid autoimmunity
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HCV-related type 2 diabetes mellitus occurs in association with hepatic steatosis, insulin resistance and high levels of both tumor-necrosis factor and CXCL10
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HCV-related gonadal alterations, such as erectile dysfunction and low levels of adrenal–gonadal androgens, have been reported in some preliminary studies
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A common T-helper 1 immune pattern could provide the pathophysiological basis of the association between HCV and endocrine disease
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Antonelli, A., Ferri, C., Ferrari, S. et al. Endocrine manifestations of hepatitis C virus infection. Nat Rev Endocrinol 5, 26–34 (2009). https://doi.org/10.1038/ncpendmet1027
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DOI: https://doi.org/10.1038/ncpendmet1027
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