Spines and Neurite Branches Function As Geometric Attractors That Enhance Protein Kinase C Action

Overview

Journal J Cell Biol

Specialty Cell Biology

Date 2005 Sep 28

PMID 16186260

Citations 19

Authors

Madeleine L Craske

Marc Fivaz

Nizar N Batada

Tobias Meyer

Affiliations

Soon will be listed here.

Abstract

Ca2+ and diacylglycerol-regulated protein kinase Cs (PKCs; conventional PKC isoforms, such as PKCgamma) are multifunctional signaling molecules that undergo reversible plasma membrane translocation as part of their mechanism of activation. In this article, we investigate PKCgamma translocation in hippocampal neurons and show that electrical or glutamate stimulation leads to a striking enrichment of PKCgamma in synaptic spines and dendritic branches. Translocation into spines and branches was delayed when compared with the soma plasma membrane, and PKCgamma remained in these structures for a prolonged period after the response in the soma ceased. We have developed a quantitative model for the translocation process by measuring the rate at which PKCgamma crossed the neck of spines, as well as cytosolic and membrane diffusion coefficients of PKCgamma. Our study suggests that neurons make use of a high surface-to-volume ratio of spines and branches to create a geometric attraction process for PKC that imposes a delayed enhancement of PKC action at synapses and in peripheral processes.

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