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A review was made to understand how plasma binding protein might influence sex-hormone action in target tissues. Steroids are predominately bound to plasma proteins and only unbound steroids enter the cells. Sex-hormone-binding globulin (SHBG) binds to both the main circulating steroid T and E2 but changes in SHBG concentrations exert significant results. Increased SHBG levels increase estrogen production and decreases T activity; whereas, increased androgens increase T action and inhibit SHBG production. These disturbances in hormone maintenance may lead to abnormal adult sex differentiation such as hirsutism and forms of hynaecomastia. By developing SHBG concentration measurement methods-responses of hirsutism to glucocorticoid or estrogem may be assessed. In addition, the effect of thyroid hormones on SHBG may also have therapeutic implications in endocrine disease.
David C. Anderson (Tue,) studied this question.
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