Journal
JOURNAL OF NEUROSCIENCE
Volume 20, Issue 12, Pages 4480-4488Publisher
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.20-12-04480.2000
Keywords
dopamine; DARPP-32; methamphetamine; cocaine; protein phosphatase 1; D1 receptor; protein kinase A
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Funding
- NIDA NIH HHS [DA10044, P01 DA010044] Funding Source: Medline
- NIMH NIH HHS [MH40899, P01 MH040899] Funding Source: Medline
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The activation of cAMP-dependent protein kinase regulates the physiological activity of AMPA-type glutamate receptors. In this study, phosphorylation of the AMPA receptor subunit GluR1 at Ser(845) was increased in neostriatal slices by activation of D1-type dopamine receptors and by inhibitors of protein phosphatase 1/protein phosphatase 2A. In contrast, Ser(831), a residue which, when phosphorylated by protein kinase C or calcium/calmodulin-dependent kinase II, increases AMPA receptor channel conductance, was unaffected by either D1 or D2 receptor agonists in neostriatal slices. The phosphorylation of Ser(845), but not Ser(831), was strongly increased in neostriatum in vivo in response to the psychostimulants cocaine and methamphetamine. The effects of dopamine and psychostimulants on the phosphorylation of GluR1 were attenuated in dopamine and cAMP-regulated phosphoprotein M-r 32 kDa (DARPP-32) knock-out mice. These results identify DARPP-32 and AMPA-type glutamate receptors as likely essential cellular effectors for psychostimulant actions.
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