The therapeutic administration of recombinant Human Growth Hormone (HGH), a specific protein synthesized outside the body that is structurally identical to the endogenous pituitary hormone. This medical intervention is indicated for patients with documented Growth Hormone Deficiency (GHD), aiming to restore physiological levels of this critical anabolic and metabolic hormone. Direct HGH administration bypasses the natural regulatory control of the hypothalamus and pituitary gland.
Origin
The term ‘Direct HGH’ is a clinical descriptor distinguishing the exogenous administration of the hormone from strategies that merely stimulate its endogenous release. Growth Hormone itself was first isolated from human pituitary glands in the 1950s, but its therapeutic use became widespread and safer following the development of recombinant DNA technology in the 1980s. This innovation allowed for the production of bio-identical, high-purity somatotropin.
Mechanism
Administered HGH binds directly to the growth hormone receptors on target tissues, primarily the liver, stimulating the production of Insulin-like Growth Factor 1 (IGF-1). This IGF-1 then mediates many of the anabolic effects, including linear growth in children and maintenance of lean body mass and bone density in adults. The direct pathway rapidly elevates systemic HGH and IGF-1 concentrations, influencing lipid metabolism, protein synthesis, and glucose regulation.
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