Regional Fos expression induced by morphine withdrawal in the 7-day-old rat.
Human infants are often exposed to opiates chronically but the mechanisms by which opiates induce dependence in the infant are not well studied. In the adult the brain regions involved in the physical signs of opiate withdrawal include the periaqueductal gray area, the locus coeruleus, amygdala, ventral tegmental area, nucleus accumbens, hypothalamus, and spinal cord. Microinjection studies show that many of these brain regions are involved in opiate withdrawal in the infant rat. Our goal here was to determine if these regions become metabolically active during physical withdrawal from morphine in the infant rat as they do in the adult. Following chronic morphine or saline treatment, withdrawal was precipitated in 7-day-old pups with the opiate antagonist naltrexone. Cells positive for Fos-like immunoreactivity were quantified within select brain regions. Increased Fos-like labeled cells were found in the periaqueductal gray, nucleus accumbens, locus coeruleus, and spinal cord. These are consistent with other studies showing that the neural circuits underlying the physical signs of opiate withdrawal are similar in the infant and adult.
McPhie
Anika A
AA
Department of Psychology, Hunter College and the Graduate Center, City University of New York, New York, NY 10016, USA.
Barr
Gordon A
GA
D000704:Analysis of Variance; D000818:Animals; D000831:Animals, Newborn; D002452:Cell Count; D005260:Female; D007150:Immunohistochemistry; D008125:Locus Coeruleus / Q000378:metabolism; D008297:Male; D009020:Morphine / Q000008:administration & dosage; D009021:Morphine Dependence / Q000378:metabolism*; D009271:Naltrexone / Q000494:pharmacology; D009292:Narcotic Antagonists / Q000494:pharmacology; D009294:Narcotics / Q000008:administration & dosage; D009714:Nucleus Accumbens / Q000378:metabolism; D010487:Periaqueductal Gray / Q000378:metabolism; D011247:Pregnancy; D016760:Proto-Oncogene Proteins c-fos / Q000378:metabolism*; D051381:Rats; D020318:Rats, Long-Evans; D013116:Spinal Cord / Q000378:metabolism; D013375:Substance Withdrawal Syndrome / Q000378:metabolism*
D009292:Narcotic Antagonists; D009294:Narcotics; D016760:Proto-Oncogene Proteins c-fos; D009271:Naltrexone; D009020:Morphine
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