The serum transport of steroid hormones.

Publisher Summary This chapter discusses the serum transport of steroid hormones. Steroid hormones are extensively bound to plasma proteins including albumin, corticosteroid binding globulin (CBG), and sex hormone binding globulin (SHBG). Because of its high concentration, albumin binding is important in determining the magnitude of the nonprotein bound or free fraction of a steroid in plasma. The generally accepted model of steroid hormone action suggests that free steroid (in equilibrium with circulating binding proteins) diffuses passively through target cell membranes and binds to a soluble intracellular receptor. The steroid-receptor complex apparently moves into the nucleus where it modifies the chromatin transcriptional activity which results in, among other things, altered levels of protein synthesis. CBG has been differentiated from the intracellular glucocorticoid and progesterone receptors by its inability to bind synthetic glucocorticoids and progestins.

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