Description: Testosterone is the main natural male sex hormone in mammals and is a steroid hormone with 19 carbon atoms. It is the main male sex hormone secreted by the testes, and it is also the most active male sex hormone. It promotes humans and animals sex organ and secondary sex characteristic development, sperm maturation, and protein metabolism for muscle strengthening. Testosterone controls the growth and development of male sex organs and male secondary sex characteristics. It is mainly used in replacement therapy for eunuchism, treatment for male menopause syndrome, and treatment for impotence, and it is also used in biochemical research.
Testosterone can bind non-specifically with plasma albumins in blood, and it can also bind with plasma sex hormone binding globulins. It can be converted into estradiol and estrone in peripheral tissue. Testosterone is mostly degraded in the liver, where its A-ring is restored, and it is converted into 17- ketosteroid under the effects of 17 -Hydroxysteroid dehydrogenase. Along with androsterone, epiandrosterone, and etiocholanlone, it is combined with glucuronic acid or sulfate and excreted in urine. Most metabolites in urine that are excreted by binding to glucuronic acid belong to 17-ketosteroids.
Testosterone, Principal hormone of the testes, produced by the interstitial cells. Major circulating androgen; converted by 5 -reductase in androgen-dependent target tissues to 5 -dehydrotestosterone which is required for normal male sexual differentiation. Also converted by aromatization to Estradiol. Testerone is a controlled substance (anabolic steroid). Androgen.