title: Proteomic identification of desmoglein 2 and activated leukocyte cell adhesion molecule as substrates of ADAM17 and ADAM10 by difference gel electrophoresis.
abstract: In contrast with the early view of metalloproteases as simple extracellular matrix-degrading entities, recent findings show that they are highly specific modulators of different signaling pathways involved, positively or negatively, in tumor development. Thus, before considering a given metalloprotease a therapeutic target, it seems advisable to characterize its function by identifying its repertoire of substrates. Here, we present a proteomic approach to identify ADAM17 substrates by difference gel electrophoresis. We found that the shedding of the extracellular domain of the transferrin receptor and those of two cell-cell adhesion molecules, activated leukocyte cell adhesion molecule (ALCAM) and desmoglein 2 (Dsg-2), is increased in cells overexpressing ADAM17. Genetic evidence shows that while ADAM17 is responsible for the shedding of ALCAM, both ADAM17 and ADAM10 can act on Dsg-2. Activation of the epidermal growth factor receptor leads to the upregulation of the shedding of Dsg-2 and to the concomitant upregulation of ADAM17, but not ADAM10, supporting the ability of overexpressed ADAM17 to shed Dsg-2. These results unveil a role of ADAM10 and ADAM17 in the shedding of cell-cell adhesion molecules. Since loss of cell adhesion is an early event in tumor development, these results suggest that ADAM17 is a useful target in anticancer therapy.
authors.affiliation: Medical Oncology Research Program, Vall d'Hebron University Hospital Research Institute, 08035 Barcelona, Spain.
authors.forename: Joan J
authors.initials: JJ
authors.lastname: Bech-Serra
authors.forename: Belén
authors.initials: B
authors.lastname: Santiago-Josefat
authors.forename: Cary
authors.initials: C
authors.lastname: Esselens
authors.forename: Paul
authors.initials: P
authors.lastname: Saftig
authors.forename: José
authors.initials: J
authors.lastname: Baselga
authors.forename: Joaquín
authors.initials: J
authors.lastname: Arribas
authors.forename: Francesc
authors.initials: F
authors.lastname: Canals
mesh_terms: D051722:ADAM Proteins / Q000235:genetics / Q000378:metabolism*; D000072198:ADAM17 Protein; D020410:Activated-Leukocyte Cell Adhesion Molecule / Q000378:metabolism*; D053829:Amyloid Precursor Protein Secretases; D000818:Animals; D016282:Aspartic Acid Endopeptidases; D016466:CHO Cells; D045744:Cell Line, Tumor; D006224:Cricetinae; D003412:Cricetulus; D051301:Desmoglein 2 / Q000378:metabolism*; D015180:Electrophoresis, Gel, Two-Dimensional; D010450:Endopeptidases / Q000235:genetics / Q000378:metabolism*; D004815:Epidermal Growth Factor / Q000494:pharmacology; D006801:Humans; D051379:Mice; D009154:Mutation; D009369:Neoplasms / Q000201:enzymology / Q000378:metabolism*; D017434:Protein Structure, Tertiary / Q000235:genetics; D040901:Proteomics; D013379:Substrate Specificity; D015854:Up-Regulation
chemical_list: D020410:Activated-Leukocyte Cell Adhesion Molecule; D051301:Desmoglein 2; D004815:Epidermal Growth Factor; D053829:Amyloid Precursor Protein Secretases; D010450:Endopeptidases; D016282:Aspartic Acid Endopeptidases; C509280:BACE1 protein, human; C509282:Bace1 protein, mouse; D051722:ADAM Proteins; D000072198:ADAM17 Protein; C000606462:ADAM17 protein, human; C000606463:Adam17 protein, mouse