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Dev Biol 2004 Jan 15;2652:416-32. doi: 10.1016/j.ydbio.2003.09.038.
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A PTP-PEST-like protein affects alpha5beta1-integrin-dependent matrix assembly, cell adhesion, and migration in Xenopus gastrula.

During amphibian gastrulation, mesodermal cell movements depend on both cell-cell and cell-matrix interactions. Ectodermal cells from the blastocoel roof use alpha5beta1 integrins to assemble a fibronectin-rich extracellular matrix on which mesodermal cells migrate using the same alpha5beta1 integrin. In this report, we show that the tyrosine phosphatase xPTP-PESTr can prevent fibronectin fibril formation when overexpressed in ectodermal cells resulting in delayed gastrulation. In addition, isolated ectodermal cells overexpressing xPTP-PESTr are able to spread on fibronectin using the alpha5beta1 integrin in the absence of activin-A induction and before the onset of gastrulation. We further show that while the inhibition of fibrillogenesis depends on the phosphatase activity of xPTP-PESTr, induction of cell spreading does not. Finally, while cell spreading is usually associated with cell migration, xPTP-PESTr promotes ectodermal cell spreading on fibronectin but also reduces cell migration in response to activin-A, suggesting an adverse effect on cell translocation. We propose that xPTP-PESTr overexpression adversely affect cell migration by preventing de-adhesion of cells from the substrate.

PubMed ID: 14732402
Article link: Dev Biol
Grant support: [+]

Species referenced: Xenopus laevis
Genes referenced: adm ag1 bcar1 bcr chrd fn1 myc odc1 pacsin2 ptpn12 ptpru pxn sox2 tbxt
Antibodies: Bcar1 Ab1 Fn1 Ab3 Itgb1 Ab3 Pacsin2 Ab1

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