Effect of chronic administration of a new potent agonist of GH-RH(1-29) NH2 on linear growth and GH responsiveness in rats

Jacek Pinski, Jan Izdebski, Andreas Jungwirth, Kate Groot, Andrew V. Schally

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The effects of a repeated or continuous administration of a potent agonistic analog of growth hormone-releasing hormone (GH-RH), [Dat1, Thr8, Orn12,21, Abu15, Nle27, Asp28, Agm29] hGH-RH(1-29) (JI-36), on the linear growth and the GH responses to bolus injections of GH-RH(1-29)NH2 were investigated in male rats about 7 weeks old. Body weight and tail length were monitored. Basal serum GH and IGF-I concentrations and GH responses to GH-RH(1-29)NH2 were measured by RIA. Chronic administration of GH-RH agonist JI-36 by continuous release from osmotic minipumps at the rate of 0.2 μg/h or twice daily injections of 0.5 and 5 μg/rat for 4 weeks significantly speeded up the growth of rats as measured by the tail length. The acceleration of growth was similar in the 3 groups and was associated with stimulation of IGF-I secretion. The GH response to bolus injection of GH-RH(1-29)NH2 was preserved in all groups and no attenuation of the response occurred in rats treated for 4 weeks with agonist JI-36 as compared with the control group. Our results indicate that chronic administration of GH-RH agonist JI-36 significantly increases the growth rate without affecting somatotroph responsiveness in rats. It is therefore likely that this class of GH-RH agonists may be useful clinically.

Original languageEnglish (US)
Pages (from-to)197-201
Number of pages5
JournalRegulatory Peptides
Issue number3
StatePublished - Sep 16 1996
Externally publishedYes


  • Growth hormone response
  • Growth hormone-releasing hormone agonist
  • Growth stimulation
  • Insulin-like growth factor I

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology
  • Physiology
  • Neuroscience(all)


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