PMID: 11907162Mar 22, 2002Paper

Pharmacological profile of a new, potent, and long-acting gonadotropin-releasing hormone antagonist: degarelix

The Journal of Pharmacology and Experimental Therapeutics
P BroquaJean-Louis Junien

Abstract

We describe the pharmacological profile in rats and monkeys of degarelix (FE200486), a member of a new class of long-acting gonadotropin-releasing hormone (GnRH) antagonists. At single subcutaneous injections of 0.3 to 10 microg/kg in rats, degarelix produced a dose-dependent suppression of the pituitary-gonadal axis as revealed by the decrease in plasma luteinizing hormone (LH) and testosterone levels. Duration of LH suppression increased with the dose: in the rat, significant suppression of LH lasted 1, 2, and 7 days after a single subcutaneous injection of degarelix at 12.5, 50, or 200 microg/kg, respectively. Degarelix fully suppressed plasma LH and testosterone levels in the castrated and intact rats as well as in the ovariectomized rhesus monkey for more than 40 days after a single 2-mg/kg subcutaneous injection. In comparative experiments, degarelix showed a longer duration of action than the recently developed GnRH antagonists abarelix, ganirelix, cetrorelix, and azaline B. The in vivo mechanism of action of degarelix was consistent with competitive antagonism, and the prolonged action of degarelix was paralleled by continued presence of radioimmunoassayable degarelix in the general circulation. In contrast to cetroreli...Continue Reading

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