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Journal of Clinical Endocrinology & Metabolism, Vol 81, 3520-3525, Copyright © 1996 by Endocrine Society

ARTICLES

Inhibin B secretion in males with gonadotropin-releasing hormone (GnRH) deficiency before and during long-term GnRH replacement: relationship to spontaneous puberty, testicular volume, and prior treatment--a clinical research center study

LB Nachtigall, PA Boepple, SB Seminara, RH Khoury, PM Sluss, AE Lecain and WF Crowley Jr
Reproductive Endocrine Unit, Massachusetts General Hospital, Boston 02114, USA.

To evaluate the physiology of inhibin B in the human male, we measured serum concentrations in normal adult men and men with isolated GnRH deficiency before and during long-term replacement with pulsatile GnRH. At baseline, inhibin B levels in the GnRH-deficient men (n = 31) were significantly lower than normal controls (85 +/- 10 pg/mL vs. 239 +/- 14 pg/mL; P < .01) and correlated positively with pretreatment testicular volume (r = .80, P = .001) and a history of spontaneous puberty, suggesting additional maturational influences on the both testicular volume and inhibin B secretion. Pulsatile GnRH administration was associated with significant increases in inhibin B, with levels averaging 108 +/- 7 pg/mL when serum LH, FSH, and T concentrations had reached the normal adult male range (n = 22; P = .02 vs. baseline). Continued GnRH administration for at least an additional year was not associated with further increases in inhibin B concentrations. Throughout the course of long-term pulsatile GnRH replacement, serum FSH levels were negatively correlated with inhibin B concentrations (e.g. r = -.71, P < 0.01; n = 14 treated 12 months after normalization of T). Although inhibin B concentrations did not correlated with sperm density during therapy, rates of fertility were higher in patients with higher baseline levels (inhibin B > or = 60 pg/mL). Increases in serum concentrations of inhibin B occurring during GnRH replacement demonstrate the gonadotropin regulation of gonadal inhibin B secretion. However, the variation in baseline inhibin B levels before GnRH administration suggests an additional gonadotropin- independent level of modulation. The negative correlation between FSH and inhibin B secretion in GnRH-deficient men receiving long-term GnRH replacement is consistent with a putative role of inhibin B in the negative feedback regulation of FSH, although direct confirmation of this role requires further investigation.


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