Selective Translocation of Ca2+/calmodulin Protein Kinase IIalpha (CaMKIIalpha) to Inhibitory Synapses

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2010 Nov 10

PMID 21059908

Citations 76

Authors

Kurt C Marsden

Adi Shemesh

K Ulrich Bayer

Reed C Carroll

Affiliations

Soon will be listed here.

Abstract

Ca(2+)/calmodulin protein kinase IIα (CaMKIIα) has a central role in regulating neuronal excitability. It is well established that CaMKIIα translocates to excitatory synapses following strong glutamatergic stimuli that induce NMDA-receptor (NMDAR)-dependent long-term potentiation in CA1 hippocampal neurons. We now show that CaMKIIα translocates to inhibitory but not excitatory synapses in response to more moderate NMDAR-activating stimuli that trigger GABA(A)-receptor (GABA(A)R) insertion and enhance inhibitory transmission. Such moderate NMDAR activation causes Thr286 autophosphorylation of CaMKIIα, which our results demonstrate is necessary and sufficient, under basal conditions, to localize CaMKIIα at inhibitory synapses and enhance surface GABA(A)R expression. Although stronger glutamatergic stimulation coupled to AMPA receptor insertion also elicits Thr286 autophosphorylation, accumulation of CaMKIIα at inhibitory synapses is prevented under these conditions by the phosphatase calcineurin. This preferential targeting of CaMKIIα to glutamatergic or GABAergic synapses provides neurons with a mechanism whereby activity can selectively potentiate excitation or inhibition through a single kinase mediator.

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