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- W2029828275 abstract "Org 30850 (Ac-D-pClPhe1,2,D-Bal3,D-Lys6,D-Ala10-LHRH) is a novel LHRH antagonist, which is being developed for the treatment of hormone-dependent disorders. The activities of this compound with respect to its endocrinological properties and side-effects were tested in rats and the results were compared with one of the first LHRH antagonists: Ac-D-pClPhe1,2,D-Trp3,D-Arg6,D-Ala10-LHRH (Org 30276). A single subcutaneous (s.c.) dose of 0.3 micrograms/kg Org 30850 administered to rats in pro-estrus gave inhibition of ovulation in approx. 50% of the rats, whereas Org 30276 was approx. 4 times less potent. The effect of a single s.c. injection of Org 30850 on testosterone levels in young adult male rats was also studied. The administration of 250 micrograms/kg or higher of Org 30850 induced a significant decrease in testosterone levels after 3 h, this effect lasted for at least 48 h. Treatment of female rats for 14 days with a daily dose of 12 micrograms/kg Org 30850 decreased statistically significantly uterine and ovarian weights. At a daily dose of 50 micrograms/kg Org 30850 completely suppressed estrous cycles and significantly decreased estradiol and FSH serum levels. The LH levels were below the detection level in both control and treated animals on the (expected) second day of di-estrus. Treatment of male rats for 14 days (25-200 micrograms/kg) resulted in a dose-dependent reduction of the gonads, accessory sex organs, testosterone levels and gonadotrophins. The decrease in gonadal function in both sexes was reversible since the females proved to be as fertile as the controls 6 weeks after the last treatment and an almost complete recovery of the weight of testes, seminal vesicles and ventral prostate was observed in the males 4 weeks after cessation of treatment. In contrast to Org 30276, Org 30850 exerted very slight irritation at the site of injection and no edematous reactions in the extremities at a daily dose of up to 8 mg/kg in male rats. It is concluded that Org 30850 is a very potent LHRH antagonist without edematous reactions and with a more favourable therapeutic index than Org 30276." @default.
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- W2029828275 date "1992-08-01" @default.
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- W2029828275 title "Properties of a potent LHRH antagonist (Org 30850) in female and male rats" @default.
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- W2029828275 doi "https://doi.org/10.1016/0960-0760(92)90111-u" @default.
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