Antagonistic activity of analogs of luteinizing hormone-releasing hormone (LH-RH) in vitro

D. H. Coy, F. Labrie, M. Savary, E. J. Coy, A. V. Schally

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The ability of eighteen analogs of LH-RH to inhibit LH-RH-induced LH release was tested in primary cultures of rat anterior pituitary cells. [Des-His2]LH-RH, [Des-His2, D-Leu6]LH-RH and [Des-His2, D-Phe6]LH-RH inhibited 50% of LH-RH-induced LH release at molar ratios (MR50s) of 3000, 500 and 60, respectively, while [D-Phe2]LH-RH, [D-Phe2, D-Leu6]LH-RH and [D-Phe2, D-Phe6]LH-RH had similar effects at MR50s of 1000, 150 and 25, respectively. This indicates that substitution of D-phenylalanine for histidine at position 2 of LH-RH leads to compounds approximately 3-fold more potent than the corresponding [Des-His2]-analogs. [D-Phe2, D-Phe6]LH-RH, the most potent antagonist tested has however a slight agonistic activity (0.003% that of LH-RH itself). [D-Phe2, D-Phe6, Phe7]LH-RH, [D-Phe2, Phe3, D-Phe6]-LH-RH and [D-Phe2, Phe5, D-Phe6]LH-RH inhibit 50% of LH-RH action at MR50s of 400, 100 and 75, respectively. All of the analogs mentioned in the last group have LH-releasing activities below 1/100,000 that of LH-RH itself.

Original languageEnglish (US)
Pages (from-to)201-208
Number of pages8
JournalMolecular and Cellular Endocrinology
Issue number3-4
StatePublished - 1976
Externally publishedYes


  • antagonistic analogs
  • cell culture
  • LH
  • pituitary

ASJC Scopus subject areas

  • Endocrinology
  • Endocrinology, Diabetes and Metabolism


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