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- W1497175107 abstract "Abstract We and others previously reported that equimolar doses of methamphetamine and cocaine differentially increase preprodynorphin mRNA in striatum: methamphetamine causes a patchy increase, whereas cocaine produces a more homogenous one. The current study directly examined whether this effect reflects differential induction in the patch–matrix division of striatum, as identified by µ opioid receptor immunohistochemistry. In addition, we determined whether doses of cocaine (30 mg/kg) and methamphetamine (2 mg/kg) that produced equivalent increases in extracellular dopamine differentially affected preprodynorphin mRNA expression in striatum of male, Sprague–Dawley rats. In both experiments, methamphetamine and cocaine differentially affected preprodynorphin mRNA in striatum after 3 h. The high, equimolar dose of methamphetamine selectively increased preprodynorphin mRNA in the patch division of rostral striatum, whereas cocaine increased preprodynorphin mRNA throughout patch and matrix divisions of striatum. In contrast, a dose of methamphetamine (2.0 mg/kg) that caused an increase in extracellular dopamine similar to that produced by 30 mg/kg cocaine did not significantly affect preprodynorphin mRNA in any region of striatum. These data provide further evidence that cocaine and amphetamines exert distinct effects on the patch–matrix division of striatum and suggest further that the post‐synaptic consequences of elevated extracellular dopamine produced by methamphetamine and cocaine are distinct." @default.
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- W1497175107 date "2002-12-13" @default.
- W1497175107 modified "2023-10-16" @default.
- W1497175107 title "Distinct effects of methamphetamine and cocaine on preprodynorphin messenger RNA in rat striatal patch and matrix" @default.
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- W1497175107 doi "https://doi.org/10.1046/j.1471-4159.2003.01507.x" @default.
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