Abstract
Preprodynorphin mRNA was measured in the nucleus accumbens (NAc) and caudate putamen (CPu) after 3-day ‘binge’ pattern cocaine administration in C57BL/6J and 129/J mice, strains which differ in behavior and in dopamine increases in the CPu after ‘binge’ cocaine. In the CPu, there was increased preprodynorphin mRNA in C57BL/6J ( P<0.05), but not in 129/J mice, with no differences in the NAc. Thus, 129/J mice are hyporesponsive to the preprodynorphin activating effects of acute ‘binge’ cocaine in the CPu.
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