The effect of chronic treatment with GH on gonadal function in men with isolated GH deficiency

Author:

Carani C,Granata AR,De Rosa M,Garau C,Zarrilli S,Paesano L,Colao A,Marrama P,Lombardi G

Abstract

Eleven adult males, previously submitted to neurosurgery because of a pituitary lesion (three with craniopharyngioma, three with clinically non-functioning adenoma and five with macroprolactinoma) were treated with recombinant GH for 12 months after the diagnosis of GH deficiency was made. Circulating FSH, LH, prolactin, testosterone, 17 beta-estradiol (E2), dehyroepiandrosterone (DHEA-S), androstenedione. 17-OH-progesterone (17OHP), IFG-I, and steroid hormone-binding protein (SHBG) levels were assayed before and after CG test at study entry and 6 and 12 months after GH treatment. A significant increase in plasma IGF-I levels was obtained after 6 and 12 months of GH treatment. In addition, CG-stimulated, but not baseline, testosterone levels showed a significant increase after 6 and 12 months of GH treatment when compared with study entry (9.6 +/- 0.5 and 9.9 +/- 0.5 vs 7.9 +/- 0.5 ng/ml; P < 0.05). Baseline, but not CG-stimulated, serum 17OHP levels were significantly increased only after 12 months of GH treatment (1.7 +/- 0.1 vs 1.4 +/- 0.1 ng/ml; P < 0.05). No significant difference was found as far as both basal and CG-stimulated E2, androstenedione, DHEA-S and SHBG were concerned. With regards to the semen analysis, only seminal plasma volume was significantly increased after 12 months of GH treatment (2.9 +/- 0.3 vs 1.7 +/- 0.3 ml; P < 0.05). No significant change in sperm count, motility and abnormal forms was observed. These data show that GH treatment displays a clear-cut effect upon Leydig cell function and increases the production of seminal plasma volume in fertile adult males with isolated GH deficiency.

Publisher

Bioscientifica

Subject

Endocrinology,General Medicine,Endocrinology, Diabetes and Metabolism

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