Diverse injurious stimuli reduce protein tyrosine phosphatase-μ expression and enhance epidermal growth factor receptor signaling in human airway epithelia

Hyun, S. W., Anglin, I. E., Liu, A., Yang, S., Sorkin, J. D., Lillehoj, E., Tonks, N. K., Passaniti, A., Goldblum, S. E. (2011) Diverse injurious stimuli reduce protein tyrosine phosphatase-μ expression and enhance epidermal growth factor receptor signaling in human airway epithelia. Experimental Lung Research, 37 (6). pp. 327-343. ISSN 01902148 (ISSN)

URL: https://www.ncbi.nlm.nih.gov/pubmed/21649524
DOI: 10.3109/01902148.2011.566673

Abstract

In response to injury, airway epithelia utilize an epidermal growth factor (EGF) receptor (EGFR) signaling program to institute repair and restitution. Protein tyrosine phosphatases (PTPs) counterregulate EGFR autophosphorylation and downstream signaling. PTPμ is highly expressed in lung epithelia and can be localized to intercellular junctions where its ectodomain homophilically interacts with PTPμ ectodomain expressed on neighboring cells. We asked whether PTPμ expression might be altered in response to epithelial injury and whether altered PTPμ expression might influence EGFR signaling. In A549 cells, diverse injurious stimuli dramatically reduced PTPμ protein expression. Under basal conditions, small interfering RNA (siRNA)-induced silencing of PTPμ increased EGFR Y992 and Y1068 phosphorylation. In the presence of EGF, PTPμ knockdown increased EGFR Y845, Y992, Y1045, Y1068, Y1086, and Y1173 but not Y1148 phosphorylation. Reduced PTPμ expression increased EGF-stimulated phosphorylation of Y992, a docking site for phospholipase C (PLC)γ1, activation of PLCγ1 itself, and increased cell migration in both wounding and chemotaxis assays. In contrast, overexpression of PTPμ decreased EGF-stimulated EGFR Y992 and Y1068 phosphorylation. Therefore, airway epithelial injury profoundly reduces PTPμ expression, and PTPμ depletion selectively increases phosphorylation of specific EGFR tyrosine residues, PLCγ1 activation, and cell migration, providing a novel mechanism through which epithelial integrity may be restored. © 2011 Informa Healthcare USA, Inc.

Item Type: Paper
Uncontrolled Keywords: Epidermal growth factor receptor Epithelial cell migration Epithelial cell repair Phospholipase Cγ Protein tyrosine phosphatase-μ Protein tyrosine phosphorylation
Subjects: bioinformatics > genomics and proteomics > genetics & nucleic acid processing > protein structure, function, modification > protein types > epidermal growth factor
organism description > animal > mammal > primates > hominids > human
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > siRNA
CSHL Authors:
Communities: CSHL Cancer Center Program > Signal Transduction
CSHL labs > Tonks lab
Depositing User: CSHL Librarian
Date: 2011
Date Deposited: 26 Oct 2011 20:09
Last Modified: 21 Feb 2017 19:56
PMCID: PMC3560916
Related URLs:
URI: http://repository.cshl.edu/id/eprint/15651

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