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Neuroreport. 2002 Jan 21;13(1):107-9.

Regulation of dynorphin gene expression by kappa-opioid agonist treatment.

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  • 1Department of Psychiatry and Behavioral Sciences, University of Miami School of Medicine, FL 33136, USA.


The effects of K-opioid agonist treatment on prodynorphin mRNA expression in the rat brain were studied. Rats were treated with the selective kappa-opioid agonist U-69593 or vehicle for 5 days and prodynorphin mRNA was measured on day 8 (3 days after the last injection) or 22 (17 days after the last injection). On day 8 prodynorphin mRNA was increased in the hypothalamus and decreased in the striatum, frontal cortex, and hippocampus of rats treated with U-69593. On day 22, prodynorphin mRNA was increased in the hypothalamus, frontal cortex and striatum of U-69593 treated rats. These findings suggests that kappa-opioid receptor agonist treatment has long-term, continually changing effects on prodynorphin mRNA expression.

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