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First published online 2 October 2008
doi: 10.1242/dev.023416

Development 135, 3521-3530 (2008)
Published by The Company of Biologists 2008
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PDGF signalling controls the migration of mesoderm cells during chick gastrulation by regulating N-cadherin expression

Xuesong Yang*, Holly Chrisman and Cornelis J. Weijer{dagger}

Division of Cell and Developmental Biology, Wellcome Trust Biocentre, College of Life Sciences, University of Dundee, Dundee DD1 5EH, UK.

{dagger} Author for correspondence (e-mail: c.j.weijer{at}dundee.ac.uk)

Accepted 9 September 2008

In the early chick embryo, Pdgfa is expressed in the epiblast, outlining the migration route that mesoderm cells expressing the receptor, Pdgfr{alpha}, follow to form somites. Both expression of a dominant-negative PDGFR{alpha} and depletion of endogenous PDGFR{alpha} ligands through injection of PDGFR{alpha}-Fc fragments, inhibit the migration of mesoderm cells after their ingression through the primitive streak. siRNA-mediated downregulation of Pdgfa expression in the epiblast on one side of the streak strongly blocks the migration of mesoderm cells into that side. Beads soaked in PDGFA elicit a directional attractive movement response in mesoderm cells, showing that PDGFA can provide directional information. Surprisingly, however, PDGF signalling is also required for directional movement towards other attractants, such as FGF4. PDGF signalling controls N-cadherin expression on mesoderm cells, which is required for efficient migration. PDGF signalling activates the PI3 kinase signalling pathway in vivo and activation of this pathway is required for proper N-cadherin expression.

Key words: Gastrulation, Cell movement, N-cadherin, PDGF signalling, PI3 kinase signalling


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