Abstract
We identified the isoforms of Ca(2+) /calmodulin-dependent protein kinase II (CaM kinase II) subunits in rat striatum. All four subunits of CaM kinase II alpha, beta, gamma and delta were detected including the isoforms of alphaB, gammaA, gammaA', gammaA.B, delta3 and delta7 with nuclear localization signal. We established NG108-15 cells with the stably expressed dopamine D2L receptor (D2LR, long form), which is an alternative splicing variant. The cells were termed NGD2L. Immunostaining demonstrated that D2LR was localized in plasma membranes. Calcium imaging with fluo-3 AM revealed that quinpirole, a D2R agonist, increased the intracellular Ca(2+), which was blocked by treatment with sulpiride and pertussis toxin in NGD2L cells, but not in mock cells. Furthermore, stimulation of D2LR with quinpirole in NGD2L cells activated the nuclear isoform of CaM kinase II. Stimulation of D2LR increased the expression of exon III- and IV-BDNF mRNA. Overexpression of CaM kinase II delta3 increased exon IV- but not exon III-BDNF mRNA. These results suggest that D2R is involved in the activation of the nuclear isoform of CaM kinase II and thereby in stimulation of gene expression through Ca(2+) signaling.
MeSH terms
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Animals
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Brain-Derived Neurotrophic Factor / genetics
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Brain-Derived Neurotrophic Factor / metabolism*
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Calcium / metabolism
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Calcium Signaling / physiology
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Calcium-Calmodulin-Dependent Protein Kinase Type 2
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Calcium-Calmodulin-Dependent Protein Kinases / analysis
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Calcium-Calmodulin-Dependent Protein Kinases / genetics
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Calcium-Calmodulin-Dependent Protein Kinases / metabolism*
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Cell Line
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Cell Membrane / metabolism
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Cell Nucleus / metabolism*
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Corpus Striatum / cytology
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Corpus Striatum / metabolism
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Dopamine Agonists / pharmacology
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Dopamine Antagonists / pharmacology
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Dopamine D2 Receptor Antagonists
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Enzyme Activation / drug effects
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Fluorescent Dyes
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Gene Expression Regulation / physiology*
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Immunoblotting
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Isoenzymes / analysis
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Isoenzymes / genetics
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Isoenzymes / metabolism
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Mice
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Pertussis Toxin
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Protein Subunits
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RNA, Messenger / biosynthesis
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RNA, Messenger / genetics
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Rats
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Receptors, Dopamine D2 / agonists
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Receptors, Dopamine D2 / genetics
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Receptors, Dopamine D2 / metabolism*
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Transfection
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Virulence Factors, Bordetella / pharmacology
Substances
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Brain-Derived Neurotrophic Factor
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Dopamine Agonists
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Dopamine Antagonists
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Dopamine D2 Receptor Antagonists
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Fluorescent Dyes
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Isoenzymes
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Protein Subunits
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RNA, Messenger
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Receptors, Dopamine D2
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Virulence Factors, Bordetella
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dopamine D2L receptor
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Pertussis Toxin
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Calcium-Calmodulin-Dependent Protein Kinase Type 2
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Calcium-Calmodulin-Dependent Protein Kinases
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Camk2a protein, mouse
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Camk2a protein, rat
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Calcium