title: Serum FSH and LH levels in men after administration of a long-acting LH-RH preparation.
abstract: The effects of the natural gonadotropin releasing hormone (LH-RH) and of a long-acting analogue, desgly10-D-leu6-LH-RH ethylamide, on the serum FSH, LH, testosterone and oestradiol-17 beta levels were studied in healthy men. The basal value for FSH was 3.58 +/- 0.47 mU/ml (SE), for LH 6.33 +/- 1.19 mU/ml. Following an intravenous dose of LH-RH the values increased by 3.40 +/- 0.88 and 25.99 +/- 5.67 mU/ml, respectively. After intravenous administration of the long-acting analogue, the peak FSH exceeded the basal value by 12.89 +/- 6.95 mU/ml, while LH increased by 41.27 +/- 4.72 mU/ml. The effect of the analogue on FSH and LH lasted 693 min and 862 min, respectively. Neither preparation changed the serum testosterone or oestradiol-17 beta levels essentially. The results suggest that the long-acting variant of LH-RH is more suitable than the natural hormone for examination of the FSH and LH reserves in men.
mesh_terms: D000293:Adolescent; D000328:Adult; D003692:Delayed-Action Preparations; D004958:Estradiol / Q000097:blood; D005640:Follicle Stimulating Hormone / Q000097:blood*; D007987:Gonadotropin-Releasing Hormone / Q000031:analogs & derivatives*; D006801:Humans; D007275:Injections, Intravenous; D007986:Luteinizing Hormone / Q000097:blood*; D008297:Male; D013739:Testosterone / Q000097:blood; D013997:Time Factors
chemical_list: D003692:Delayed-Action Preparations; D007987:Gonadotropin-Releasing Hormone; D013739:Testosterone; D004958:Estradiol; C012403:LHRH, Leu(6)-N-Et-GlyNH2(10)-; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone