An early reduction in GH peak amplitude in preproghrelin-deficient male mice has a minor impact on linear growth

Rim Hassouna, Philippe Zizzari, Catherine Tomasetto, Johannes D Veldhuis, Oriane Fiquet, Alexandra Labarthe, Julie Cognet, Frederik Steyn, Chen Chen, Jacques Epelbaum, Virginie Tolle

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Abstract

Ghrelin is a gut hormone processed from the proghrelin peptide acting as the endogenous ligand of the GH secretagogue receptor 1a. The regulatory role of endogenous ghrelin on pulsatile GH secretion and linear growth had to be established. The aim of the present study was to delineate the endogenous actions of preproghrelin on peripheral and central components of the GH axis. Accordingly, the ultradian pattern of GH secretion was measured in young and old preproghrelindeficient males. Blood samples were collected by tail bleeding every 10 minutes over a period of 6 hours. Analysis of the GH pulsatile pattern by deconvolution showed that GH was secreted in an ultradian manner in all genotypes, with major secretory peaks occurring at about 3-hour intervals. In older mice, the peak number was reduced and secretion was less irregular compared with younger animals. Remarkably, in young Ghrl-/-mice, the amplitude of GH secretory bursts was significantly reduced. In older mice, however, genotype differences were less significant. Changes in GH pulsatility in young Ghrl-/-mice were associated with a tendency for reduced GH pituitary contentsandplasma IGF-I concentrations, but with only a minor impactonlinear growth. In Ghrl-/-mice, despite reduced Acyl ghrelin to des-acyl ghrelin ratio,GHsecretion was not impaired. Ghrelin deficiency was not associated with a reduction in hypothalamic GHRH content or altered response to GHRH stimulation. Therefore, reduction in GHRH production and/or sensitivity do not primarily account for the alteredGHpulsatile secretion of young Ghrl-/-mice. Instead,GHRHexpression was elevated in young but not old Ghrl-/-mice, suggesting that differential compensatory responses resulting from the absence of endogenous ghrelin is occurring according to age. These results show that endogenous ghrelin is a regulator of GH pulse amplitude in growing mice but does not significantly modulate linear growth. Copyright

Original languageEnglish (US)
Pages (from-to)3561-3571
Number of pages11
JournalEndocrinology
Volume155
Issue number9
DOIs
StatePublished - Sep 1 2014

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Ghrelin
Growth
Genotype
Insulin-Like Growth Factor I
Tail
Hormones
Hemorrhage
Ligands
Peptides

ASJC Scopus subject areas

  • Endocrinology

Cite this

Hassouna, R., Zizzari, P., Tomasetto, C., Veldhuis, J. D., Fiquet, O., Labarthe, A., ... Tolle, V. (2014). An early reduction in GH peak amplitude in preproghrelin-deficient male mice has a minor impact on linear growth. Endocrinology, 155(9), 3561-3571. https://doi.org/10.1210/en.2014-1126

An early reduction in GH peak amplitude in preproghrelin-deficient male mice has a minor impact on linear growth. / Hassouna, Rim; Zizzari, Philippe; Tomasetto, Catherine; Veldhuis, Johannes D; Fiquet, Oriane; Labarthe, Alexandra; Cognet, Julie; Steyn, Frederik; Chen, Chen; Epelbaum, Jacques; Tolle, Virginie.

In: Endocrinology, Vol. 155, No. 9, 01.09.2014, p. 3561-3571.

Research output: Contribution to journalArticle

Hassouna, R, Zizzari, P, Tomasetto, C, Veldhuis, JD, Fiquet, O, Labarthe, A, Cognet, J, Steyn, F, Chen, C, Epelbaum, J & Tolle, V 2014, 'An early reduction in GH peak amplitude in preproghrelin-deficient male mice has a minor impact on linear growth', Endocrinology, vol. 155, no. 9, pp. 3561-3571. https://doi.org/10.1210/en.2014-1126
Hassouna R, Zizzari P, Tomasetto C, Veldhuis JD, Fiquet O, Labarthe A et al. An early reduction in GH peak amplitude in preproghrelin-deficient male mice has a minor impact on linear growth. Endocrinology. 2014 Sep 1;155(9):3561-3571. https://doi.org/10.1210/en.2014-1126
Hassouna, Rim ; Zizzari, Philippe ; Tomasetto, Catherine ; Veldhuis, Johannes D ; Fiquet, Oriane ; Labarthe, Alexandra ; Cognet, Julie ; Steyn, Frederik ; Chen, Chen ; Epelbaum, Jacques ; Tolle, Virginie. / An early reduction in GH peak amplitude in preproghrelin-deficient male mice has a minor impact on linear growth. In: Endocrinology. 2014 ; Vol. 155, No. 9. pp. 3561-3571.
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