We investigated the effects of estradiol on bioactive luteinizing hormone (LH) release in normal men using two complementary strategies: (i) steady state intravenous infusions of estradiol at its endogenous production rate, and (ii) oral administration of the antiestrogen, tamoxifen HCl. Immunoreactive and biologically active LH were monitored by radioimmunoassay and the rat interstitial cell testosterone bioassay, respectively. Estradiol infusions significantly suppressed mean plasma bioactive LH concentrations and decreased the bio/immuno LH ratio. Conversely, antiestrogen treatment enhanced spontaneous bioactive LH pulse frequency, increased bioactive LH pulse amplitude, and augmented plasma intrapulse and interpulse bio/immuno LH ratios. Low-dose pulsed injections of exogenous gonadotropin-releasing hormone (GnRH) also increased plasma bio/immuno LH ratios. However, tamoxifen attenuated the ability of exogenous GnRH to further enhance the bio/immuno LH ratio, which suggests that endogenous LH release was already maximally enriched in LH bioactivity during antiestrogen administration. We conclude that estradiol modulates the pulsatile secretion of LH molecules enriched in biological activity in man.
J D Veldhuis, M L Dufau
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Molecular and Cellular Endocrinology | 2010 |
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Yen & Jaffe's Reproductive Endocrinology | 2009 |
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Clinical Endocrinology | 2009 |
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Obesity | 2007 |
In vitro biological-to-immunological ratio of serum gonadotropins throughout male puberty in children with insulin-dependent diabetes mellitus
E Nishimura, D Söderlund, C Castro-Fernández, T Zariñán, JP Méndez, A Ulloa-Aguirre |
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Testosterone, estradiol and aromatase inhibitor therapy in elderly men
BZ Leder |
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Endocrinology and metabolism clinics of North America | 2005 |
Effects of Aromatase Inhibition in Elderly Men with Low or Borderline-Low Serum Testosterone Levels
BZ Leder, JL Rohrer, SD Rubin, J Gallo, C Longcope |
The Journal of clinical endocrinology and metabolism | 2004 |
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NK Mello, JH Mendelson, SS Negus, M Kelly, I Knudson, ME Roth |
Neuropsychopharmacology | 2004 |
Mechanisms of Hypothalamic-Pituitary-Gonadal Disruption in Polycystic Ovarian Syndrome
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Archives of Medical Research | 2001 |
Five-Day Pulsatile Gonadotropin-Releasing Hormone Administration Unveils Combined Hypothalamic-Pituitary-Gonadal Defects Underlying Profound Hypoandrogenism in Men with Prolonged Critical Illness1
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The Journal of clinical endocrinology and metabolism | 2001 |
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Fertility and Sterility | 1997 |
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Pediatric Nephrology | 1996 |
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Systems Biology in Reproductive Medicine | 1996 |
Estrogen and progesterone receptor mRNA are expressed in distinct pattern in male primate reproductive organs
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Journal of Assisted Reproduction and Genetics | 1995 |
Estrogen and progesterone receptor mRNA are expressed in distinct pattern in male primate reproductive organs
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Clinical Endocrinology | 1994 |
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J Rabinovici |
Baillière's Clinical Obstetrics and Gynaecology | 1993 |
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General Pharmacology: The Vascular System | 1993 |
Neuroendocrine Physiology of the Normal Male Gonadal Axis
A Reyes-Fuentes, JD Veldhuis |
Endocrinology and metabolism clinics of North America | 1993 |
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H Lübbert, I Leo-Roßberg, J Hammerstein |
Fertility and Sterility | 1992 |
Biologic Rhythms in Clinical and Laboratory Medicine
Y Touitou, E Haus |
1992 | |
Bioactive gonadotrophin secretion in man
A Tsatsoulla, SM Shalet, WR Robertson |
Clinical Endocrinology | 1991 |
TESTOSTERONE REDUCES THE BIOACTIVITY OF LUTEINIZING HORMONE (LH) IN MAN
A Tsatsoulis, SM Shalet, P Richardson, WR Robertson |
Clinical Endocrinology | 1990 |
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JM Kaufman, JP Deslypere, M Giri, A Vermeulen |
The Journal of Steroid Biochemistry and Molecular Biology | 1990 |
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JA Talbot, SM Shalet, A Tsatsoulis, M Grabinski, WR Robertson |
International Journal of Andrology | 1990 |
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1990 | |
Pathophysiological features of the pulsatile secretion of biologically active luteinizing hormone in man
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Journal of Steroid Biochemistry | 1989 |
Hypogonadism Following Long-term Treatment with Diethylstilbestrol
J Wortsman, A Hamidinia, SJ Winters |
The American Journal of the Medical Sciences | 1989 |
Attenuated release of biologically active luteinizing hormone in healthy aging men
RJ Urban, JD Veldhuis, RM Blizzard, ML Dufau |
Journal of Clinical Investigation | 1988 |
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K Mavroudis, A Evans, H Mamtora, DC Anderson, WR Robertson |
Clinical Endocrinology | 1988 |
Pathophysiologic Features of Episodic Gonadotropin Secretion in Man
JD Veldhuis |
The American Journal of the Medical Sciences | 1987 |