Journal
JOURNAL OF NEUROSCIENCE
Volume 24, Issue 47, Pages 10652-10659Publisher
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.3179-04.2004
Keywords
prefrontal cortex; dopamine receptors; PDGFR; inhibition; GABA; DARPP-32
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Funding
- NIDA NIH HHS [R01 DA014698, T32DA007288-12, T32 DA007288] Funding Source: Medline
- NIMH NIH HHS [R01MH064569-02, R01 MH064569] Funding Source: Medline
- PHS HHS [14698] Funding Source: Medline
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Typically, D1 and D2 dopamine (DA) receptors exert opposing actions on intracellular signaling molecules and often have disparate physiological effects; however, the factors determining preferential activation of D1 versus D2 signaling are not clear. Here, in vitro patch-clamp recordings show that DA concentration is a critical determinant of D1 versus D2 signaling in prefrontal cortex (PFC). Low DA concentrations (<500 nM) enhance IPSCs via D1 receptors, protein kinase A, and cAMP. Higher DA concentrations (>1 muM) decrease IPSCs via the following cascade: D2-->G(i)-->platelet-derived growth factor receptor -->up arrow phospholipase C-->up arrowIP(3)-->up arrowCa(2+)-->down arrow dopamine and cAMP-regulated phosphoprotein-32-->up arrowprotein phosphatase 1/2A-->down arrowGABA(A). Blockade of any molecule in the D2-linked pathway reveals a D1-mediated increase in IPSCs, suggesting that D1 effects are occluded at higher DA concentrations by this D2-mediated pathway. Thus, DA concentration, by acting through separate signaling cascades, may determine the relative amount of cortical inhibition and thereby differentially regulate the tuning of cortical networks.
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