Abstract
Cellular growth, differentiation and migration is regulated by protein tyrosine phosphorylation. Receptor-like protein tyrosine phosphatases are thus likely to be key regulators of vital cellular processes. The regulation of these enzymes is in general poorly understood. Ligands have been identified only for a small subset of the receptor-like protein tyrosine phosphatases and in no case has upregulation of the specific activity by extracellular ligands been demonstrated. Prompted by earlier findings of ligands for receptor-like protein tyrosine phosphatases in extracellular matrix we investigated if MatrigelTM, a preparation of extracellular matrix proteins, contained modulators of the specific activity of the receptor-like protein tyrosine phosphatase DEP-1. MatrigelTM stimulation of cells increased the specific activity of immunoprecipitated DEP-1. Also, incubation of immunoprecipitated DEP-1 with MatrigelTM led to an increase in DEP-1 activity, which was blocked by soluble DEP-1 extracellular domain. Finally, immunoprecipitated ΔECD-DEP-1, a mutant form of DEP-1 lacking most of the extracellular domain, failed to respond to MatrigelTM stimulation. These experiments identify MatrigelTM as a source of DEP-1 agonist(s) and provide the first evidence for upregulation of the specific activity of receptor-like protein tyrosine phosphatases by extracellular ligands.
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Acknowledgements
We thank Antoni Gaya for kindly providing us with the 143.41 monoclonal antibody and Olli Leppänen for the recombinant PDGF β-receptor GST fusion protein. We would also like to thank Carl-Henrik Heldin, Lars Rönnstrand and members of the Growth Regulation group for critical reading of the manuscript.
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Sörby, M., Sandström, J. & Östman, A. An extracellular ligand increases the specific activity of the receptor-like protein tyrosine phosphatase DEP-1. Oncogene 20, 5219–5224 (2001). https://doi.org/10.1038/sj.onc.1204581
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DOI: https://doi.org/10.1038/sj.onc.1204581
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