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Endocrinology Series: Growth Hormone

Growth hormone’s release is pulsatile. There are spikes of GH release with an overall low concentration in the body. Therefore, its measurement is meaningless. GH targets fat and liver cells to produce IGF-1. Insulin induced hypoglycemia stimulates GH release and hyperglycemia inhibits GH release.

GH action occurs when it binds to its membrane receptor. Membrane receptor binding activates tyrosine kinase JAK-2. JAK-2 phosphorylates proteins involved in signaling pathways. Phosphorylation of such proteins leads to difference effects in different specific cell types.

A second, indirect, action of GH is the anabolic buildup of the body. The growth promoting effects of GH are mediated through IGF-1 and IGF-2. IGF is produced by the liver in response to GH and promotes the growth of muscle, fat, and bone.


Direct Effects of GH

Indirect Effects of GH (via IGF-1)

Decreased insulin sensitivityIncreased lipolysis Increased protein synthesisIncreased epiphyseal (bone) growth

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Last updated October 2013

F. Zaria Chinelo, Pharm.D. (25 Posts)

F. Zaria Chinelo is an internationally recognized award winning writer, artist, scientist, and entrepreneur. She holds multiple degrees in Pharmacy, Molecular& Cell Biology, Chemistry, and Psychology. As a Pharmacy Law Expert, Zaria helps professionals and organizations avoid potential liability. As an Organizational Management Expert, Zaria helps businesses recruit and retain sustainable talent. Zaria also helps individuals positively impact their career. Dr. Chinelo writes passionately about various topics.

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