title: Long-term inhibition of ovulation by a GnRH-antagonist at low dose level.
abstract: Ac-D-Trp1,3, D-Cpa2, D-Lys6, D-Ala10-GnRH has been prepared by solid phase synthesis. The peptide was found to completely inhibit ovulation when administered on proestrus day in a dose of 1.5 microgram/rat, s.c. The peptide completely inhibited ovulation for a period corresponding to three to four cycles when administered daily in a dose of 5 micrograms/rat, s.c. and caused 70% inhibition of ovulation in a dose of 3 micrograms/rat.
mesh_terms: D000818:Animals; D001681:Biological Assay; D004334:Drug Administration Schedule; D005260:Female; D007987:Gonadotropin-Releasing Hormone / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000037:antagonists & inhibitors* / Q000138:chemical synthesis / Q000494:pharmacology; D007202:Indicators and Reagents; D010060:Ovulation / Q000187:drug effects*; D011247:Pregnancy; D011359:Proestrus / Q000187:drug effects; D051381:Rats
chemical_list: D007202:Indicators and Reagents; D007987:Gonadotropin-Releasing Hormone; C040278:MI 1544