Effect of intranasal growth hormone-releasing hormone and corticotropin-releasing hormone administration on growth hormone and cortisol release: Improved bioavailability by means of sodium-glycocholate

A. E. Pontiroli, M. G. Perfetti, B. Fattor, G. Pozza

Research output: Contribution to journalArticlepeer-review

Abstract

Several peptide hormones are effective when administered intranasally (in); these include oxytocin, vasopressin, insulin, glucagon, and calcitonin. With regard to GHRH and CRH, previous studies demonstrated that their bioavailability following in administration was very low. In this study we evaluated the serum GH response to 50 μg GHRH iv and to 700 μg GHRH in, the latter given alone and with 5 and 15 mg sodium-glycocholate (SGC), a surfactant, in six normal men. The bioavailability of in GHRH, calculated as net GH secretory area, was very low, and increased to 7% that of iv GHRH when SGC was used. In the same men 50 μg CRH was administered both iv and in, alone and with 5 and 15 mg SGC. The bioavailability of in CRH, calculated as net cortisol secretory area, was very low and increased to 100% that of iv CRH when 15 mg SGC was used. These data indicate that the efficacy of GHRH and CRH administered in is significantly augmented by SGC.

Original languageEnglish
Pages (from-to)821-824
Number of pages4
JournalJournal of Clinical Endocrinology and Metabolism
Volume68
Issue number4
Publication statusPublished - 1989

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology, Diabetes and Metabolism

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