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Previous studies have shown that CRH is capable of inhibiting GH release in response to GHRH in adult subjects, and this effect appeared to be sex dependent and more pronounced in women than in men. To assess whether CRH has an inhibitory action on GH release in children also, the effects of graded doses of CRH on the GHRH-induced GH secretion were studied in three groups of prepubertal children. All subjects underwent a GHRH test (1 microgram/kg), followed, on separate occasions, by the combined administration of GHRH (1 microgram/kg) and CRH (1 microgram/kg, group A, n = 6; 1.5 microgram/kg, group B, n = 6; 2 microgram/kg, group C, n = 7). GH concentrations in response to the single GHRH injection were comparable in the three groups. The combined administration of GHRH and CRH resulted in serum GH concentrations similar to those obtained in the same subjects in response to GHRH alone when 1 and 1.5 microgram/kg CRH were given. In contrast, the administration of 2 microgram/kg CRH together with GHRH led to an increase in GH concentrations significantly lower than those after the GHRH injection alone (GH area under the curve, 1022.18 +/- 106.26 vs. 3109.16 +/- 794.29 microgram/Lx24 h; P &lt; 0.05). No differences in the GH response to GHRH alone or to GHRH plus CRH were detected between male and female subjects. The results of the present study indicate that CRH is capable of inhibiting GHRH-induced GH release in children. Moreover, the inhibitory effect by CRH appears to be dose dependent and not sex related.

Dose-dependent inhibition of growth hormone (GH)-releasing hormone-induced GH release by corticotropin-releasing hormone in prepubertal children.