Topical steroids
IGFs got there name because of there structural and functional similarity to proinsulin. topical steroids Articles on steroids. This hypothesis dictates that IGFs work as endocrine growth factors, meaning that they travel in the blood to the target tissues after being released from cells that produced it, specifically the liver in this case. Indeed, many studies have followed showing that in animals that are GH deficient, systemic IGF- 1 infusions lead to normal growth. The effects were similar to those observed after GH administration. topical steroids Topical steroids. Interestingly, additional studies also followed that showed IGF-1 to be greatly inferior as an endocrine growth factor requiring almost 50 times the amount to exert that same effects of GH (Skottner, 1987). Recently rhIGF-1 has become widely more available and is currently approved form the treatment of HIV associated wasting. This increased availability allowed testing of this hypothesis in humans. topical steroids Bodybuilding-suppliments. Studies in human subjects with GH insensitivity (Laron syndrome) has consistently validated the somatomedin hypothesis (Rank, 1995; Savage, 1993). The second theory as to how GH produces anabolic effects is called the Dual Effector theory (Green, 1985). This theory states that GH itself has anabolic effects on body tissues without the need of IGF-1. This theory has been supported by studies injecting GH directly into growth plates. Further evidence supporting this theory lies in genetically altered strains of mice. When comparing mice who genetically over express GH and mice who over express IGF-1, GH mice are larger. This evidence has been sited by some to support the dual effector theory. Interestingly, when IGF-1 antiserum (it destroys IGF-1) is administered concomitantly with GH, all of the anabolic effects of GH are abolished. The Somatomedin theory and the Dual Effector theory are not all that different. One simply asserts that GH can produce growth without IGF-1. From the research I am inclined to believe in the Somatomedin theory.
Topical steroids
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