Abstract:
:Properly functional CNS circuits depend on inhibitory interneurons that in turn rely upon activity-dependent gene expression for morphological development, connectivity, and excitatory-inhibitory coordination. Despite its importance, excitation-transcription coupling in inhibitory interneurons is poorly understood. We report that PV+ interneurons employ a novel CaMK-dependent pathway to trigger CREB phosphorylation and gene expression. As in excitatory neurons, voltage-gated Ca(2+) influx through CaV1 channels triggers CaM nuclear translocation via local Ca(2+) signaling. However, PV+ interneurons are distinct in that nuclear signaling is mediated by γCaMKI, not γCaMKII. CREB phosphorylation also proceeds with slow, sigmoid kinetics, rate-limited by paucity of CaMKIV, protecting against saturation of phospho-CREB in the face of higher firing rates and bigger Ca(2+) transients. Our findings support the generality of CaM shuttling to drive nuclear CaMK activity, and they are relevant to disease pathophysiology, insofar as dysfunction of PV+ interneurons and molecules underpinning their excitation-transcription coupling both relate to neuropsychiatric disease.
journal_name
Neuronjournal_title
Neuronauthors
Cohen SM,Ma H,Kuchibhotla KV,Watson BO,Buzsáki G,Froemke RC,Tsien RWdoi
10.1016/j.neuron.2016.03.001subject
Has Abstractpub_date
2016-04-20 00:00:00pages
292-307issue
2eissn
0896-6273issn
1097-4199pii
S0896-6273(16)00180-Xjournal_volume
90pub_type
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