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Department of Metabolic Medicine, Faculty of Medicine, Imperial College London, Hammersmith Hospital, London W12 ONN, United Kingdom
Address all correspondence and requests for reprints to: Prof. S. R. Bloom, Department of Metabolic Medicine, Faculty of Medicine, Imperial College London, 6th Floor Commonwealth Building, Hammersmith Hospital, Du Cane Road, London W12 ONN, United Kingdom. E-mail: s.bloom{at}imperial.ac.uk.
Context: Mutation of the G protein-coupled receptor 54 is associated with a failure of reproductive function. The endogenous neuropeptide agonist for G protein-coupled receptor 54, kisspeptin, potently stimulates the hypothalamic-pituitary-gonadal axis in rodents and primates.
Objective: The present study was designed to determine the effects of elevating circulating kisspeptin levels on LH, FSH, and testosterone in male volunteers.
Design: This was a double-blind, placebo-controlled, crossover study.
Setting: This was a hospital-based study.
Participants: Male volunteers (n = 6) were recruited.
Interventions: Each volunteer received a 90-min iv infusion of kisspeptin-54 (4 pmol/kg·min) and a control infusion of saline (0.9%) in random order.
Main Outcome Measure: Plasma LH, FSH, and testosterone concentrations were measured.
Results: Kisspeptin-54 infusion significantly increased plasma LH, FSH, and testosterone concentrations compared with saline infusion (mean 90-min LH: kisspeptin, 10.8 ± 1.5 vs. saline, 4.2 ± 0.5 U/liter, P < 0.001; mean 90-min FSH: kisspeptin, 3.9 ± 0.7 vs. saline, 3.2 ± 0.6 U/liter, P < 0.001; mean 180-min testosterone: kisspeptin, 24.9 ± 1.7 vs. saline, 21.7 ± 2.2 nmol/liter, P < 0.001). The plasma half-life of kisspeptin-54 was calculated to be 27.6 ± 1.1 min. The mean metabolic clearance rate was 3.2 ± 0.2 ml/kg·min, and the volume of distribution was 128.9 ± 12.5 ml/kg.
Conclusion: Elevation of plasma concentrations of kisspeptin in human males significantly increases circulating LH, FSH, and testosterone levels. Kisspeptin infusion provides a novel mechanism for hypothalamic-pituitary-gonadal axis manipulation in disorders of the reproductive system.
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M. Tena-Sempere GPR54 and kisspeptin in reproduction Hum. Reprod. Update, September 1, 2006; 12(5): 631 - 639. [Abstract] [Full Text] [PDF] |
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W. S Dhillo, K. G Murphy, and S. Bloom Endocrinology: the next 60 years. J. Endocrinol., July 1, 2006; 190(1): 7 - 10. [Abstract] [Full Text] [PDF] |
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J. T. Smith, S. M. Popa, D. K. Clifton, G. E. Hoffman, and R. A. Steiner Kiss1 neurons in the forebrain as central processors for generating the preovulatory luteinizing hormone surge. J. Neurosci., June 21, 2006; 26(25): 6687 - 6694. [Abstract] [Full Text] [PDF] |
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S. Tovar, M. J. Vazquez, V. M. Navarro, R. Fernandez-Fernandez, J. M. Castellano, E. Vigo, J. Roa, F. F. Casanueva, E. Aguilar, L. Pinilla, et al. Effects of Single or Repeated Intravenous Administration of Kisspeptin upon Dynamic LH Secretion in Conscious Male Rats Endocrinology, June 1, 2006; 147(6): 2696 - 2704. [Abstract] [Full Text] [PDF] |
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J. Roa, E. Vigo, J. M. Castellano, V. M. Navarro, R. Fernandez-Fernandez, F. F. Casanueva, C. Dieguez, E. Aguilar, L. Pinilla, and M. Tena-Sempere Hypothalamic Expression of KiSS-1 System and Gonadotropin-Releasing Effects of Kisspeptin in Different Reproductive States of the Female Rat Endocrinology, June 1, 2006; 147(6): 2864 - 2878. [Abstract] [Full Text] [PDF] |
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S. B. Seminara, M. J. DiPietro, S. Ramaswamy, W. F. Crowley Jr., and T. M. Plant Continuous Human Metastin 45-54 Infusion Desensitizes G Protein-Coupled Receptor 54-Induced Gonadotropin-Releasing Hormone Release Monitored Indirectly in the Juvenile Male Rhesus Monkey (Macaca mulatta): A Finding with Therapeutic Implications Endocrinology, May 1, 2006; 147(5): 2122 - 2126. [Abstract] [Full Text] [PDF] |
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J. T Smith, D. K Clifton, and R. A Steiner Regulation of the neuroendocrine reproductive axis by kisspeptin-GPR54 signaling. Reproduction, April 1, 2006; 131(4): 623 - 630. [Abstract] [Full Text] [PDF] |
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S. B. Seminara We All Remember Our First Kiss: Kisspeptin and the Male Gonadal Axis J. Clin. Endocrinol. Metab., December 1, 2005; 90(12): 6738 - 6740. [Full Text] [PDF] |
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