Testosterone administration inhibits gonadotropin secretion by an effect directly on the human pituitary

The Journal of Clinical Endocrinology and Metabolism
C B SheckterW J Bremner

Abstract

Testosterone (T) administration slows LH pulse frequency in man, presumably by an effect on the hypothalamic GnRH pulse generator, but it also may have a direct action on the pituitary. To determine if T does indeed affect gonadotropin secretion by acting directly on the pituitary, we studied the effect of T on GnRH-stimulated gonadotropin secretion. Six men with hypogonadotropic hypogonadism were treated with physiological doses of GnRH (5 micrograms every 2 h, sc by automatic infusion pump) for 6 weeks. Once their gonadotropin levels were normal, the men received a supraphysiological dosage of T enanthate (200 mg, im, weekly for 8 weeks) in addition to GnRH. They then received GnRH alone for a final 8-week period. Blood sampling was performed every 10 min for 8 h at the end of each of the three study periods. T administration suppressed the mean serum LH level to about 50% of the value during GnRH alone [18 +/- 2 (+/- SE) vs. 37 +/- 2 micrograms/L; P less than 0.05] and suppressed the mean serum FSH level to about 30% of the value during GnRH alone (39 +/- 6 vs. 128 +/- 28 micrograms/L; P less than 0.05). Eight weeks after stopping T, while continuing GnRH alone, serum LH and FSH levels were similar to those at the end of the...Continue Reading

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