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Am J Physiol Endocrinol Metab 233: E430-E433, 1977;
0193-1849/77 $5.00
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AJP: Endocrinology and Metabolism, Vol 233, Issue 5, E430-E433
Copyright © 1977 by American Physiological Society

ARTICLES

Inhibition of dopamine-induced release of growth hormone by thyrotropin-releasing hormone

RA Steiner, P Illner, P Marques, D Williams, L Shen, L Edwards, and CC Gale

The effects of thyrotropin-releasing hormone (TRH) and dopamine (DA) on serum growth hormone (GH) levels were examined in the adolescent male baboon. Intravenously administered DA (40 microgram/kg-min-1 for 20 min) raised serum GH and glucose and lowered serum insulin concentrations but caused no increase in blood pressure. Concomitant intravenous infusion of TRH at 2 doses (96 ng/kg-min-1 and 40 microgram/kg-min-1 for 20 min) blocked the DA-induced increase in serum GH. The relatively low effective doses of TRH used to suppress the DA-induced GH increase suggest an interaction with catecholamines at the hypothalamic and/or pituitary to influence GH release.




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