@Dr JIM Gonna retract my statement re: not posting a study. For the benefit of others, I will. BTW I actually went quite easy on you, if you thought that was criticism you're gonna hate this.
You are dead wrong re: insulin's benign effect on gh. I still don't personally like the use of slin, but it ABSOLUTELY makes gh more effective.
For the study showing exogenous slins positive effects on gh, google: Growth hormone receptor modulators, Vita Birzniece & Akira Sata & Ken KY Ho, Reviews in Endocrine and Metabolic Disorders June 2009, Volume 10, Issue 2, pp 145-156
Couple of relevant excerpts:
In human studies, there is also evidence that insulin modulates the expression of GHRs. This is based on measurement of circulatory levels of GHBP. As GHBP is derived from proteolytic cleavage of the extracellular domain of the GH receptor, change in GHBP levels may reflect GH receptor status [73]. Low blood levels of GHBP occur in conditions associated with GHresistance such as malnutrition and catabolic states. This is exemplified in anorexia where GH levels are elevated, and levels of GHBP are low [74, 75]. ***Thus when insulin levels are low, high levels of GH does not translate into a rise in circulating IGFI [76–82].*** In type I diabetes, GHBP levels are low and associates with low IGF-I levels [83]. These investigations have also observed a significant positive correlation between levels of GHBP and total insulin dose, ***suggesting that GHR status in humans is dependent on adequate insulinisation [83].***
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There is also strong evidence that insulin modulates GHR signalling in addition to the effects on receptor expression and surface translocation. In rat hepatoma cells, low dose insulin administration results in GH-induced stimulation of JAK2 phosphorylation however high dose insulin treatment results in inhibitory effect [69, 86]. The effect of insulin on GHR function appears to be mediated by the PI-3 kinase and MAPK/ERK pathways [69, 87, 88]. It has been shown that insulin increases GH signalling by enhancing GHinduced activation of MAPK/ERK pathway through post signalling cross-talk [88].
In summary, insulin regulates GHR expression, translocation and GHR function. The regulation of GH receptor expression is complex and tissue dependent. Insulin stimulates hepatic GHR synthesis and GH binding but down-regulates GHR expression in kidney and bone tissue.
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Ok Hack, your turn. Post your proof.