Phosphorylation of tau by glycogen synthase kinase 3beta in intact mammalian cells influences the stability of microtubules.

Abstract

Tau is a neuronal microtubule-associated protein found predominantly in axons. Hyperphosphorylation of tau reduces the stability of microtubules, which may be a pathogenic mechanism in Alzheimer's disease. To understand the different effects between tau and glycogen synthase kinase 3beta (GSK-3beta) phosphorylated tau on the organization and stability of microtubules, we performed transfection studies on 3T3 cells using EGFP-tau (Enhanced Green Fluorescence Protein-tau) and GSK-3beta to quantify the stability of microtubules. Laser confocal microscope observation revealed that thick and thin microtubule bundles could be induced by tau and GSK-3beta phosphorylated tau. The bundles appeared either to be relatively straight or to form a ring around the circumference of the cell. Both the thick and thin microtubule bundles were resistant to colchicine-induced dissociation, with thick bundles more resistant than thin bundles. The bundles induced by GSK-3beta phosphorylated tau were sensitive to colchicine, and could be reversed by the addition of LiCl, an inhibitor of GSK-3beta.

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@article{Sang2001PhosphorylationOT, title={Phosphorylation of tau by glycogen synthase kinase 3beta in intact mammalian cells influences the stability of microtubules.}, author={Helen M . Sang and Ze Lu and Y-Q Li and Bing-gen Ru and Wei Wang and J Chen}, journal={Neuroscience letters}, year={2001}, volume={312 3}, pages={141-4} }