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GHRP-2 (GPA-748, Wyeth-Ayerst) is an orally active peptide growth hormone (GH) secretagogue which acts through a G-protein coupled receptor for which the natural ligand--an acylated 28 amino acid peptide, ghrelin--was recently isolated. Ghrelin and its analogs have potent GH-releasing activities, but in animal studies ghrelin also causes weight gain. As part of a study examining the effect of GHRP-2 on GH secretory dynamics and growth, we evaluated its effects on appetite and body weight. Ten prepubertal children with GH deficiency (growth velocity &lt; or = 4 cm/year in association with a GH response to two provocative stimuli &lt; 10 ng/ml) were included in the study. At the beginning of the study their age was 10.4 +/- 2 years (mean +/- SD), with a height of -3.8 +/- 0.1 SDS. Body mass index (BMI) was 17.9 +/- 3.6 kg/m2, and the BMI Z score 0.21 +/- 1.51 SDS. GHRP-2 was administered orally at a dose of 900 microg/kg b.i.d. for 12 months. Seven out of ten patients reported a significant increase in appetite during the first 6 months of the study. There was a tendency for the BMI SDS to increase during the study, but this increase did not reach statistical significance (0.21 +/- 1.5 vs 0.25 +/- 1.5 SDS). These results suggest that at a dose of 900 microg/kg b.i.d., GHRP-2 appears to have a transient stimulatory effect on appetite, but does not have a chronic clinically significant effect on BMI in children with GH deficiency.

Changes in Appetite and Body Weight in Response to Long-term Oral Administration of the Ghrelin Agonist GHRP-2 in Growth Hormone Deficient Children