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Volume 16, Number 22, Issue of November 15, 1996 pp. 7240-7252
Copyright ©1996 Society for Neuroscience

A Role in Migration for the alpha vbeta 1 Integrin Expressed on Oligodendrocyte Precursors

Received July 29, 1996; revised Aug. 29, 1996; accepted Sept. 4, 1996.

Richard Milner1, Gwynneth Edwards2, Charles Streuli2, and Charles ffrench-Constant1, 3

1 Wellcome/Cancer Research Campaign Institute of Developmental Biology and Cancer, Cambridge CB2 1QR, United Kingdom, and Department of Medical Genetics, University of Cambridge, Cambridge CB2 1QR, United Kingdom, 2 Department of Cell and Structural Biology, School of Biological Sciences, University of Manchester, Manchester M13 9PT, United Kingdom, and 3 Medical Research Council Cambridge Center for Brain Repair, University Forvie Site, Cambridge CB2 2QQ, United Kingdom

Myelination of the CNS requires the migration of oligodendrocyte precursors throughout the CNS from restricted regions within the ventricular and subventricular zones. In light of the significant effects of cell-extracellular matrix (ECM) interactions on cell migration in other developing systems, we have analyzed the role of integrins in oligodendrocyte precursor migration. We have shown previously that oligodendrocyte precursors in vitro express a limited repertoire of integrins, including alpha 6beta 1, alpha vbeta 1, and alpha vbeta 3, and that differentiation is associated with downregulation of alpha vbeta 1 and upregulation of alpha vbeta 5. Using a migration assay based on the movement of cells away from an agarose drop containing a high-density cell suspension, we find that RGD peptides (that block alpha v but not alpha 6 integrins) and anti-beta 1 antibodies block migration on an astrocyte-derived ECM, whereas anti-beta 3 antibodies have little effect. These re- sults suggest that alpha vbeta 1 but not alpha 6beta 1 plays a role in oligodendrocyte precursor migration, and this is confirmed by the use of blocking monoclonal antibodies that distinguish these two integrins. In keeping with the results of others, we find that differentiated oligodendrocytes lose migratory potential and that the timing of this loss correlates with downregulation of alpha vbeta 1. Taken together with the work of others showing that ECM ligands for alpha vbeta 1 are expressed within the CNS, we propose that this integrin plays a significant role in the migration of oligodendrocyte precursors in vivo and that its downregulation during differentiation could be an important factor regulating the migratory phenotype of these cells.

Key words: oligodendrocyte; integrin; extracellular matrix; platelet-derived growth factor; differentiation; migration; astroglial matrix; vitronectin




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