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Journal of Clinical Endocrinology & Metabolism, Vol 64, 68-73, Copyright © 1987 by Endocrine Society
ARTICLES |
JP Deslypere, JM Kaufman, T Vermeulen, D Vogelaers, JL Vandalem and A Vermeulen
The influence of aging on serum LH and testosterone (T) pulse frequency and gonadotroph sensitivity to androgen and estrogen feedback was studied in young (less than 55 yr old) and elderly (greater than 65 yr) Trappist monks. LH pulse frequency (sampling interval, 20 min) was significantly lower [0.25 +/- 0.03 (+/- SEM) vs. 0.38 +/- 0.02 pulses/h; P less than 0.01] in elderly (n = 21) than in young monks (n = 27); the pulse amplitudes were similar. Similarly, T pulse frequency was lower in the elderly than in the young monks (0.13 +/- 0.04 vs. 0.23 +/- 0.02 pulses/h; P less than 0.01). In elderly men, the hypothalamo-pituitary complex was more sensitive to 5 alpha-androstan- 17 beta-ol-3-one feedback, as determined by the decrease in serum LH and T levels. Moreover, during 5 alpha-androstan-17 beta-ol-3-one (125 mg/day, percutaneously, for 10 days) administration, the LH response to LHRH (100 micrograms, iv) was significantly higher in the elderly men compared to the pretreatment response. During estradiol (1.5 mg/day, percutaneously for 10 days) administration, the LH response to LHRH was decreased in the elderly men, but unchanged in the young men, suggesting greater responsiveness to estradiol in the elderly men. We conclude that in aged men, decreased testicular androgen secretion is not exclusively the consequence of a primary testicular alteration, but that important changes occur in hypothalamo-pituitary function, specifically decreased LH pulse frequency and increased LH responsiveness to sex hormone feedback.
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D. Vernet, J. J. Bonavera, R. S. Swerdloff, N. F. Gonzalez-Cadavid, and C. Wang Spontaneous Expression of Inducible Nitric Oxide Synthase in the Hypothalamus and Other Brain Regions of Aging Rats Endocrinology, July 1, 1998; 139(7): 3254 - 3261. [Abstract] [Full Text] [PDF]
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M. Bergendahl, J. A. Aloi, A. Iranmanesh, T. M. Mulligan, and J. D. Veldhuis Fasting Suppresses Pulsatile Luteinizing Hormone (LH) Secretion and Enhances Orderliness of LH Release in Young but Not Older Men J. Clin. Endocrinol. Metab., June 1, 1998; 83(6): 1967 - 1975. [Abstract] [Full Text]
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T. Mulligan, A. Iranmanesh, M. L. Johnson, M. Straume, and J. D. Veldhuis Aging alters feed-forward and feedback linkages between LH and testosterone in healthy men Am J Physiol Regulatory Integrative Comp Physiol, October 1, 1997; 273(4): R1407 - R1413. [Abstract] [Full Text] [PDF]
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