Inhibition of gonadotropic and ovarian function by intranasal administration of D-Ser (TBU)6-EA10-LHRH in normo-ovulatory women and patients with polycystic ovary disease

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Abstract
We investigated the effectiveness of D-Ser (TBU)6-EA10-LHRH (Buserelin) intranasally 600 μg/day given 6 times daily in desensitizing normal ovulatory women and patients with polycystic ovarian disease (PCOD) before initiation of ovarian stimulation for in vitro fertilization. We found that this regimen was sufficient to suppress the gonadotrophs in the normal women and in 8 out of 10 PCOD patients. In PCOD ovarian hormones became normal after Buserelin administration. Adrenal steroidogenesis was not affected by the GnRH agonist. We suggested that the frequency of administration of Buserelin was important to achieve a constant receptor binding and consequently a rapid desensitization. The choice of a monoclonal immunoradiometric assay for luteinizing hormone (LH) and follicle stimulating hormone (FSH) in association with the estradiol-benzoate provocation test were essential in evaluating desensitization.

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