Journal
TRENDS IN ENDOCRINOLOGY AND METABOLISM
Volume 26, Issue 7, Pages 376-383Publisher
ELSEVIER SCIENCE LONDON
DOI: 10.1016/j.tem.2015.05.001
Keywords
sex hormone-binding globulin; insulin; cytokines
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Sex hormone-binding globulin (SHBG) is produced and secreted by the liver into the bloodstream where it binds sex steroids and regulates their bioavailability. Traditionally, body mass index (BMI) was thought to be the major determinant of SHBG concentrations and hyperinsulinemia the main cause for low SHBG levels found in obesity. However, no mechanisms have ever been described. Emerging evidence now shows that liver fat content rather than BMI is a strong determinant of circulating SHBG. In this review we discuss evidence demonstrating that insulin might not regulate SHBG production, describe putative molecular mechanisms by which proinflammatory cytokines downregulate SHBG, and comment on recent findings suggesting dietary SHBG regulation. Finally, clinical implications of all of these findings and future perspectives are discussed.
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