Lck tyrosine kinase mediates β1-integrin signalling to regulate Schwann cell migration and myelination
Open Access
- 28 May 2013
- journal article
- Published by Springer Science and Business Media LLC in Nature Communications
- Vol. 4 (1), 1912-14
- https://doi.org/10.1038/ncomms2928
Abstract
Schwan cells ensheath and insulate axons, enabling efficient transmission of action potentials. Ness and colleagues study the role of the kinase Lck in Schwan cells, and find that Lck signalling regulates cell migration, axonal sorting and myelin thickness. The interaction between laminin and β1-integrin on the surface of Schwann cells regulates Schwann cell proliferation, maturation and differentiation. However, the signalling mediators that fine-tune these outcomes are not fully elucidated. Here we show that lymphoid cell kinase is the crucial effector of β1-integrin signalling in Schwann cells. Lymphoid cell kinase is activated after laminin treatment of Schwann cells, while downregulation of β1-integrin with short interfering RNAs inhibits lymphoid cell kinase phosphorylation. Treatment of Schwann cells with a selective lymphoid cell kinase inhibitor reveals a pathway that involves paxillin and CrkII, which ultimately elevates Rac-GTP levels to induce radial lamellipodia formation. Inhibition of lymphoid cell kinase in Schwann cell-dorsal root ganglion cocultures and dorsal root ganglions from Lck^−/− mice show a reduction of Schwann cell longitudinal migration, reduced myelin formation and internode length. Finally, Lck^−/− mice exhibit delays in myelination, thinner myelin with abnormal g-ratios and aberrant myelin outfoldings. Our data implicate lymphoid cell kinase as a major regulator of cytoskeletal dynamics, migration and myelination in the peripheral nervous system.This publication has 50 references indexed in Scilit:
- Genetic disruption of Pten in a novel mouse model of tomaculous neuropathyEMBO Molecular Medicine, 2012
- Basement Membranes: Cell Scaffoldings and Signaling PlatformsCold Spring Harbor Perspectives in Biology, 2010
- Visualization of molecular interactions using bimolecular fluorescence complementation analysis: Characteristics of protein fragment complementationChemical Society Reviews, 2009
- Crk and CrkL adaptor proteins: networks for physiological and pathological signalingCell Communication and Signaling, 2009
- Disruption of laminin in the peripheral nervous system impedes nonmyelinating Schwann cell development and impairs nociceptive sensory functionGlia, 2008
- The function of RhoGTPases in axon ensheathment and myelinationGlia, 2008
- Paxillin comes of ageJournal of Cell Science, 2008
- Essential and distinct roles for cdc42 and rac1 in the regulation of Schwann cell biology during peripheral nervous system developmentThe Journal of cell biology, 2007
- β1 integrin activates Rac1 in Schwann cells to generate radial lamellae during axonal sorting and myelinationThe Journal of cell biology, 2007
- Myelination: all about Rac ‘n’ rollThe Journal of cell biology, 2007