Serum vitamin D metabolites do not change in response to intravenous injection of thyrotropin releasing hormone (TRH) and growth hormone releasing factor (GHRF 1-44) in children.
Several reports claim that thyroid hormones and growth hormone participate in the regulation of vitamin D synthesis. We investigated whether there was a direct effect of their releasing hormones on vitamin D metabolism. TRH (7 micrograms/kg) was injected iv in 8 children with euthyroid diffuse goiter and GHRF (1 microgram/kg) in 10 short normal children. TRH injection induced significant TSH elevations but no changes in serum vitamin D metabolites, calcium and phosphorus. GHRF administration resulted in marked growth hormone elevations without alterations in the serum vitamin D metabolites, calcium and phosphorus. These results indicate no direct effect of TRH or GHRF itself on vitamin D metabolism, as well as a lack of very short term effect of growth hormone and TSH.
D002112:Calcifediol / Q000097:blood*; D002117:Calcitriol / Q000097:blood*; D002118:Calcium / Q000097:blood; D002648:Child; D013007:Growth Hormone-Releasing Hormone / Q000008:administration & dosage / Q000494:pharmacology*; D006801:Humans; D007275:Injections, Intravenous; D010758:Phosphorus / Q000097:blood; D013972:Thyrotropin / Q000097:blood; D013973:Thyrotropin-Releasing Hormone / Q000008:administration & dosage / Q000494:pharmacology*; D014807:Vitamin D / Q000378:metabolism
D014807:Vitamin D; D010758:Phosphorus; D013973:Thyrotropin-Releasing Hormone; D013972:Thyrotropin; D013007:Growth Hormone-Releasing Hormone; D002117:Calcitriol; D002112:Calcifediol; D002118:Calcium