A Divergent Canonical WNT-signaling Pathway Regulates Microtubule Dynamics: Dishevelled Signals Locally to Stabilize Microtubules

Overview

Journal J Cell Biol

Specialty Cell Biology

Date 2004 Jan 22

PMID 14734535

Citations 101

Authors

Lorenza Ciani

Olga Krylova

Matthew J Smalley

Trevor C Dale

Patricia C Salinas

Affiliations

Soon will be listed here.

Abstract

Dishevelled (DVL) is associated with axonal microtubules and regulates microtubule stability through the inhibition of the serine/threonine kinase, glycogen synthase kinase 3beta (GSK-3beta). In the canonical WNT pathway, the negative regulator Axin forms a complex with beta-catenin and GSK-3beta, resulting in beta-catenin degradation. Inhibition of GSK-3beta by DVL increases beta-catenin stability and TCF transcriptional activation. Here, we show that Axin associates with microtubules and unexpectedly stabilizes microtubules through DVL. In turn, DVL stabilizes microtubules by inhibiting GSK-3beta through a transcription- and beta-catenin-independent pathway. More importantly, axonal microtubules are stabilized after DVL localizes to axons. Increased microtubule stability is correlated with a decrease in GSK-3beta-mediated phosphorylation of MAP-1B. We propose a model in which Axin, through DVL, stabilizes microtubules by inhibiting a pool of GSK-3beta, resulting in local changes in the phosphorylation of cellular targets. Our data indicate a bifurcation in the so-called canonical WNT-signaling pathway to regulate microtubule stability.

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