PMID: 2505292Jan 1, 1989Paper

Post-natal morphine differentially affects opiate and stress analgesia in adult rats

Psychopharmacology
D Arjune, R J Bodnar

Abstract

Alterations in nociceptive reactivity, opiate receptor binding, and other behavioral responses occur in rats exposed to morphine either in utero or post-natally. The present study examined whether post-natal morphine (0, 1 or 20 micrograms, days 1-7) altered analgesia on the tail-flick and jump tests induced by nonopioid-mediated continuous cold-water swims (CCWS), opioid-mediated intermittent cold-water swims (ICWS) or morphine (2.5 and 5.0 mg/kg, SC) in adult male and female rats. Changes in body weight, developmental signs (e.g., eye opening), basal pain thresholds, and both CCWS and ICWS hypothermia were also assessed. Previously-reported gender differences occurred for all forms of analgesia in control rats. Post-natal morphine treatment transiently increased ICWS analgesia and hypothermia, and transiently decreased CCWS analgesia and hypothermia, suggesting that these effects were not specific to pain inhibition. Post-natal morphine treatment significantly increased the magnitude of morphine analgesia on both tests in females, and significantly decreased the magnitude of morphine analgesia on both tests in males, thereby acting to vitiate the observed gender differences in morphine analgesia. Such effects could not be exp...Continue Reading

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Citations

Nov 1, 1990·Peptides·G A OlsonA J Kastin
Apr 27, 2000·Neuroscience and Biobehavioral Reviews·J S MogilW F Sternberg
Apr 1, 1996·Environmental Health Perspectives·G Bignami
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Apr 28, 2009·Progress in Neurobiology·Ryan K Butler, David P Finn
Oct 27, 2004·The Journal of Pain : Official Journal of the American Pain Society·Wendy F SternbergLaura Scorr
May 16, 2006·International Journal of Developmental Neuroscience : the Official Journal of the International Society for Developmental Neuroscience·Agnes RimanóczyIlona Vathy
Jan 1, 2000·Nutritional Neuroscience·A d'AmoreA Loizzo

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