Abstract
The mammalian basolateral amygdala (BLA) and medial prefrontal cortex (mPFC) comprise a functionally interconnected circuit that is critical for processing opiate-related associative memories. In the opiate-naïve state, reward memory formation in the BLA involves a functional link between dopamine (DA) D1 receptor (D1R) and extracellular signal-related kinase 1/2 (ERK1/2) signaling substrates, but switches to a DA D2 (D2R)/Ca2+/calmodulin-dependent protein kinase IIα (CaMKIIα)-dependent memory substrate following chronic opiate exposure and spontaneous withdrawal. Using conditioned place preference (CPP) in rats paired with molecular analyses, we examined the role of intra-mPFC CaMKII, ERK and DAergic activity during the formation of opiate associative memories, and how opiate exposure state may regulate the functions of these molecular memory pathways. We report that the role of CaMKIIα signaling is functionally reversed within the BLA-mPFC pathway depending on opiate exposure state. Thus, in the opiate-naïve state, intra-mPFC but not intra-BLA blockade of CaMKII signaling prevents formation of opiate reward memory. However, following chronic opiate exposure and spontaneous withdrawal, the role of CaMKII signaling in the BLA-mPFC is functionally reversed. This behavioral memory switch corresponds to a selective increase in the expression of D2R and CaMKIIα, but not other calcium/calmodulin-related molecules, nor D1R expression levels within the mPFC.
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Acknowledgements
This work was supported by the Canadian Institutes of Health Research (MOP 123378), the Natural Science and Engineering Research Council of Canada (NSERC), and an Ontario Graduate Scholarship to LGR.
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Rosen, L., Zunder, J., Renard, J. et al. Opiate Exposure State Controls a D2-CaMKIIα-Dependent Memory Switch in the Amygdala-Prefrontal Cortical Circuit. Neuropsychopharmacol 41, 847–857 (2016). https://doi.org/10.1038/npp.2015.211
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DOI: https://doi.org/10.1038/npp.2015.211
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