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Propagation of CaMKII translocation waves in heterogeneous spiny dendrites

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Abstract

CaMKII (Ca2+-calmodulin-dependent protein kinase II) is a key regulator of glutamatergic synapses and plays an essential role in many forms of synaptic plasticity. It has recently been observed experimentally that stimulating a local region of dendrite not only induces the local translocation of CaMKII from the dendritic shaft to synaptic targets within spines, but also initiates a wave of CaMKII translocation that spreads distally through the dendrite with an average speed of order 1μm/s. We have previously developed a simple reaction–diffusion model of CaMKII translocation waves that can account for the observed wavespeed and predicts wave propagation failure if the density of spines is too high. A major simplification of our previous model was to treat the distribution of spines as spatially uniform. However, there are at least two sources of heterogeneity in the spine distribution that occur on two different spatial scales. First, spines are discrete entities that are joined to a dendritic branch via a thin spine neck of submicron radius, resulting in spatial variations in spine density at the micron level. The second source of heterogeneity occurs on a much longer length scale and reflects the experimental observation that there is a slow proximal to distal variation in the density of spines. In this paper, we analyze how both sources of heterogeneity modulate the speed of CaMKII translocation waves along a spiny dendrite. We adapt methods from the study of the spread of biological invasions in heterogeneous environments, including homogenization theory of pulsating fronts and Hamilton–Jacobi dynamics of sharp interfaces.

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  1. Department of Mathematics, University of Utah, Salt Lake City, UT, 84112, USA

    Paul C. Bressloff

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Bressloff, P.C. Propagation of CaMKII translocation waves in heterogeneous spiny dendrites. J. Math. Biol. 66, 1499–1525 (2013). https://doi.org/10.1007/s00285-012-0542-9

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  • DOI: https://doi.org/10.1007/s00285-012-0542-9

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