Abstract
We assessed the impact of chronic swim stress in rats (daily for 3 weeks) on vesicular monoamine transporter 2 (VMAT2) in the nucleus accumbens and striatum. Exposure to repeated swim stress resulted in significant reduction in VMAT2 density in nucleus accumbens (20%, p<0.01) and striatum subregions (21–38%, p<0.001). The down-regulation of VMAT2 in this dopaminergic regions may serve as an adaptatory mechanism in the response to prolonged stress, and may be relevant to chronic stress-induced depression.
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