Anabolic-Androgenic Steroids (AAS) are a class of synthetic therapeutic agents derived from the endogenous male sex hormone, testosterone. They are designed to elicit both anabolic effects, promoting skeletal muscle growth and protein synthesis, and androgenic effects, which stimulate the development and maintenance of male secondary sexual characteristics. Clinical use is restricted to treating specific conditions like hypogonadism or muscle wasting, due to their potent and often detrimental effects on the endocrine system.
Origin
The development of AAS compounds began in the 1930s, following the successful isolation and synthesis of natural testosterone, with early research focused on their therapeutic potential for treating debilitating conditions. The compound term is a direct reflection of their dual physiological actions: anabole (building up) and andros (man) and genes (producing). The pharmacological pursuit was to maximize the desirable anabolic properties while minimizing the less desired androgenic effects.
Mechanism
AAS molecules operate by readily diffusing across the cell membrane to bind with high affinity to intracellular androgen receptors (AR) present in target tissues such as muscle, bone, and reproductive organs. The resulting hormone-receptor complex translocates to the nucleus, where it directly interacts with DNA to modulate gene transcription. This genomic mechanism increases protein synthesis and nitrogen retention, leading to the characteristic hypertrophy and increased muscle mass.
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