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Calcitonin suppresses growth hormone (GH) response to growth hormone — releasing hormone (GHRH) in man

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Abstract

Calcitonin (CT) receptors have been found in the hypothalamus, suggesting a neuroendocrine role for this peptide. We have recently shown that, in the rat, central administration of salmon calcitonin (sCT) suppresses basal and GHRH-stimulated GH secretion. To further investigate how sCT alters GH secretion, we studied the effects of sCT (100U MRC, im) or placebo on basal and GHRH (50μg, iv)-stimulated GH secretion in 6 normal men. GHRH was administered 1 h after sCT injection. Basal GH levels were not altered by sCT administration. However, GH response to GHRH was markedly suppressed by sCT (area under the curve — sCT: 574.6 ± 69.7 vs placebo: 1057.2 ± 284.8 μg. min/L; p < 0.02). Cortisol levels were higher in sCT-treated subjects compared to controls, from 45 to 105 min after sCT injection (p < 0.05). However, no correlation was found between GH response to GHRH and Cortisol levels. No changes in glucose, calcium and PTH levels were seen. These results demonstrate that sCT inhibits GHRH-induced GH secretion in man by a mechanism apparently independent of changes in peripheral Cortisol, glucose, calcium and PTH levels.

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This work was supported by Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) and Fundaçao de Amparo à Pesquisa do Estado de Sao Paulo (FAPESP).

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Lengyel, AM.J., Toledo, A.L.G., Czepielewski, M.A. et al. Calcitonin suppresses growth hormone (GH) response to growth hormone — releasing hormone (GHRH) in man. J Endocrinol Invest 12, 25–29 (1989). https://doi.org/10.1007/BF03349910

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