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Continuous treatment with morphine increases diazepam binding inhibitor mRNA in mouse brain
1Department of Pharmacology, Kawasaki Medical School, Matsushima, Kurashiki, Japan.
Abstract:
Effects of acute and chronic morphine treatment on the expression of diazepam binding inhibitor (DBI) mRNA in the mouse brain were examined. Cerebral DBI mRNA expression significantly increased in morphine-dependent mice, and this increase is more remarkable in morphine-withdrawn mice, whereas a single administration of morphine (50 mg/kg) produced no changes in the expression. Simultaneous administration of naloxone (3 mg/kg) with morphine completely abolished the increase in cerebral DBI mRNA expression observed in morphine-dependent and -withdrawn mice. These results indicate that a chronic functional interaction between morphine and opioid receptors has a critical role in increases in DBI mRNA expression.
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