Have a common biosynthetic pathway hormones: cholesterol precursor, by reducing the side chain to produce the first 21 carbon pregnenolone or progesterone, then the side chain to 19 carbon Evolution androgen, and then through the A-ring 18 generated by the carbon aromatized estrogen. Metabolic inactivation of sex hormones are basically the same way, that the formation of glucuronic acid ester or sulfate conjugates, such as water-soluble strong in the liver, kidney and other metabolic organ, and then with the urine, or with the bile into the intestines from the feces .
Sex hormones in the mode of action at the molecular level, as with the other steroid hormones, in combination with a specific receptor protein into the cell, the formation of the hormone - receptor complex then binds to the nucleus, acts on the chromatin DNA affects the transcription activity of Consequently, new or increased existing protein biosynthesis, and thus the regulation of cell metabolism, growth or differentiation. Hormones for small molecules, with a fat-soluble, mainly by free diffusion (passive transport) into the cell, combined with cytoplasmic receptors, forming a hormone - cytoplasmic receptor complexes, conformational changes and heat shock protein from the solution obtained by entering ability of the nucleus, transfer into the cytoplasm by the nucleus, nuclear hormone receptor binding with the formation of the hormone - receptor complex nucleus to stimulate transcription of the DNA to produce a specific mRNA, and then into the cytoplasm, the ribosome formation of protein translation play biological effects.
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