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Am J Physiol Endocrinol Metab 274: E779-E784, 1998;
0193-1849/98 $5.00
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Vol. 274, Issue 5, E779-E784, May 1998

Evidence against a role for the growth hormone-releasing peptide axis in human slow-wave sleep regulation

Rodrigo Moreno-Reyes1, Myriam Kerkhofs2, Mireille L'Hermite-Balériaux1, Michael O. Thorner3, Eve Van Cauter4, and Georges Copinschi1

1 Center for the Study of Biological Rhythms (CERB), Department of Endocrinology and Laboratory of Experimental Medicine, and 2 Sleep Laboratory, Department of Psychiatry, Hôpital Erasme, Université Libre de Bruxelles, B-1070 Brussels, Belgium; 3 Department of Medicine, University of Virginia, Charlottesville, Virginia 22908; and 4 Department of Medicine, University of Chicago, Chicago, Illinois 60637

A complex interrelationship exists between sleep and somatotropic activity. In humans, intravenous injections of growth hormone-releasing hormone (GHRH) given during sleep consistently stimulate slow-wave (SW) sleep, particularly when given in the latter part of the night. In the present study, the possible somnogenic effects induced under similar conditions by GH-releasing peptide (GHRP) were investigated in seven young healthy men. Bolus intravenous injections of GHRP-2 (1 µg/kg body wt) or saline, in randomized order, were given after 60 s of the third rapid-eye-movement period. All GHRP injections were immediately followed by transient prolactin elevations and by GH pulses of a magnitude within or around the upper limit of the physiological range. Except for a nonsignificant tendency to increased amounts of wakefulness during the 1st h after the injection, no effects of GHRP-2 administration on sleep were detected. There was in particular no enhancement of SW sleep. Thus, in contrast to GHRH, late-night single injections of GHRP-2 at a dosage resulting in similar GH elevations have no stimulatory effects on SW sleep. The present data provide evidence against the involvement of the GHRP axis in human SW sleep regulation.

prolactin; rapid-eye-movement sleep


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