Temporal patterns of increased growth hormone secretion in mice after oral administration of l-ornithine: possible involvement of ghrelin receptors

Emi Taniguchi, Ayumi Hattori, Kaito Kurogi, Yukihiro Hishida, Fumiko Watanabe, Mitsuhiro Furuse, Shinobu Yasuo

Research output: Contribution to journalArticlepeer-review

Abstract

l-Ornithine is known to stimulate growth hormone (GH) release in mammals. Here, we demonstrated that increases in plasma GH levels after oral administration of l-ornithine were first observed 150 min after administration, and the elevated levels were sustained for more than 90 min in mice. The increase was significantly delayed compared with the reported timing of plasma and tissue levels of l-ornithine after administration. The l-ornithine-induced increase in GH release was completely blocked by [D-Lys3]-GHRP-6, a ghrelin receptor antagonist, but not by cyclosomatostatin or JV-1-38, antagonists of somatostatin and GH-releasing hormone, respectively. These results suggest the involvement of ghrelin receptor-mediated pathways in l-ornithine-induced increases in GH release.

Original languageEnglish
Pages (from-to)1283-1287
Number of pages5
JournalJournal of Veterinary Medical Science
Volume84
Issue number9
DOIs
Publication statusPublished - 2022

All Science Journal Classification (ASJC) codes

  • General Veterinary

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