Abstract
Calcium/calmodulin kinase type II (CaMKII) is a major postsynaptic density protein. CaMKII is postulated to act as a ‘molecular switch’, which, when triggered by a transient rise in calcium influx, becomes active for prolonged periods because of its ability to autophosphorylate. We studied experience-dependent plasticity in the barrel cortex of mice carrying a point mutation of the α-CaMKII gene (T286A), which abolishes this enzyme's ability to autophosphorylate. Plasticity was prevented in adult and adolescent mice homozygous for the mutation, but was normal in heterozygotes and wild-type littermates. These results provide evidence that the molecular switch hypothesis is valid for neocortical experience-dependent plasticity.
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Acknowledgements
We thank Paul Chapman and Frank Sengpiel for critical reading of the text and Mervyn McKenna for histology. This work was supported by grants from NIH NS27759 and MRC(UK) to K.F. K.P.G. was supported by the German Research Council (DFG).
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Figure. Plasticity in adolescent T286A mutants
The effect of 18 days of deprivation on responses to D1 and principal vibrissae stimulation in adolescent T-286 homozygotes. Each point represents data from a single cell recorded in layers 2/3. The cell's response to the spared D1 vibrissa is plotted against its response to the deprived principal vibrissa. Equal responses from both vibrissae result in a point on the dashed line (45 degree line). Note that, in spite of deprivation, most cells are dominated by the deprived principal vibrissa. Additionally, domination of the remaining cells by the D1 vibrissa is due to depression of the deprived principal vibrissa response rather than potentiation of the D1 response. In contrast, in wild-type animals, plasticity is expressed mainly by potentiation of the D1 input (see Fig. 4 in ref. 40 for comparison). (GIF 168 kb)
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Glazewski, S., Giese, K., Silva, A. et al. The role of α-CaMKII autophosphorylation in neocortical experience-dependent plasticity. Nat Neurosci 3, 911–918 (2000). https://doi.org/10.1038/78820
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DOI: https://doi.org/10.1038/78820
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