Effect of sex hormone administration on circulating ghrelin levels in peripubertal children

Y. Lebenthal, G. Gat-Yablonski, B. Shtaif, A. Padoa, M. Phillip*, L. Lazar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Ghrelin levels gradually decrease throughout childhood and with advancing pubertal stage. The change during puberty is more pronounced in boys than girls. Objective: The objective of the study was to investigate whether the pubertal drop in ghrelin secretion is modified by the increase in sex hormones. Patients and Methods: Ghrelin levels were measured in 34 short peripubertal children (17 boys and 17 girls) aged 8-12.5 yr before and after sex hormone priming for GH stimulation testing. Results: In boys, priming with testosterone increased testosterone to pubertal levels (23.7 ± 7.1 nmol/liter), which in turn induced a marked decrease in ghrelin (from 1615.8 = 418.6 to 1390.0 = 352.0 pg/ml) and leptin (from 8.0 ± 4.5 to 5.8 = 3.2 ng/ml) and an increase in IGF-I (from 162.7 ± 52.8 to 291.1 ± 101.6 ng/ml) (P < 0.001 for all parameters). In girls, priming with estrogen led to a supraphysiological increase in estradiol levels (1313.8 ± 438.0 pmol/liter), which had no effect on ghrelin, leptin, or IGF-I. There was no correlation between ghrelin levels and levels of sex hormones, leptin, or body mass index in either boys or girls. Conclusions: A pharmacological increase in sex hormones is associated with a marked decline in circulating levels of ghrelin in boys but not girls. Additional longitudinal studies through puberty are needed to elucidate the physiological interaction between sex hormones and ghrelin.

Original languageEnglish
Pages (from-to)328-331
Number of pages4
JournalJournal of Clinical Endocrinology and Metabolism
Volume91
Issue number1
DOIs
StatePublished - Jan 2006

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