PMID: 8980227Dec 27, 1996Paper

CREB phosphorylation and dephosphorylation: a Ca(2+)- and stimulus duration-dependent switch for hippocampal gene expression

Cell
H BitoR W Tsien

Abstract

While changes in gene expression are critical for many brain functions, including long-term memory, little is known about the cellular processes that mediate stimulus-transcription coupling at central synapses. In studying the signaling pathways by which synaptic inputs control the phosphorylation state of cyclic AMP-responsive element binding protein (CREB) and determine expression of CRE-regulated genes, we found two important Ca2+/calmodulin (CaM)-regulated mechanisms in hippocampal neurons: a CaM kinase cascade involving nuclear CaMKIV and a calcineurin-dependent regulation of nuclear protein phosphatase 1 activity. Prolongation of the synaptic input on the time scale of minutes, in part by an activity-induced inactivation of calcineurin, greatly extends the period over which phospho-CREB levels are elevated, thus affecting induction of downstream genes.

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