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Upregulation of cAMP Response Element-Mediated Gene Expression during Experience-Dependent Plasticity in Adult Neocortex

Alison L. Barth¹, Mervyn McKenna¹, Stanislaw Glazewski¹, Penelope Hill¹, Soren Impey², Daniel Storm², and Kevin Fox¹

¹ Cardiff School of Biosciences, Cardiff University, Cardiff, CF10 3US Wales, United Kingdom, and ² Department of Pharmacology, University of Washington, Seattle, Washington 98195

Gene transcription is thought to be essential for memory consolidation and long-lasting changes in synaptic function. In particular, the signal transduction pathways that activate the transcription factor cAMP response element binding protein (CREB) have been implicated in the process of synaptic potentiation. To study the involvement of this pathway in neocortical plasticity within the barrel cortex, we have used a strain of mice carrying a LacZ reporter gene with six cAMP response elements (CREs) upstream of a minimal promoter. Removal of all but one facial whisker results in the expansion of the spared whisker's functional representation within somatosensory cortex. Under the same conditions of whisker deprivation, we observed a strong (eightfold compared with baseline) and highly place-specific upregulation of CRE-mediated gene transcription in layer IV of the spared whisker barrel. Reporter gene upregulation occurred rapidly after deprivation (16 hr) and was only observed under experimental conditions capable of inducing whisker response potentiation. LacZ expression in layer IV was accompanied by an increase in responsiveness of a subpopulation of layers II/III cells to spared whisker stimulation as determined by in vivo single-unit recording. Given that CREB is involved in the expression of plasticity in superficial layers (Glazewski et al., 1999), and yet CRE-mediated gene expression occurs in layer IV, it is likely that the molecular events initiating plasticity occur presynaptically to the cells that exhibit changes in their receptive field properties.

Key words: barrel cortex; somatosensory; experience-dependent plasticity; gene regulation; gene expression; CREB

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Copyright © 2000 Society for Neuroscience  0270-6474/00/20114206-11$05.00/0

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