title: Tissue transglutaminase mediates the pro-malignant effects of oncostatin M receptor over-expression in cervical squamous cell carcinoma.
abstract: Oncostatin M receptor (OSMR) is commonly over-expressed in advanced cervical squamous cell carcinoma (SCC), producing a significantly worse clinical outcome. Cervical SCC cells that over-express OSMR show enhanced responsiveness to the major ligand OSM, which induces multiple pro-malignant effects, including increased cell migration and invasiveness. Here, we show that tissue transglutaminase (TGM2) is an important mediator of the ligand-dependent phenotypic effects of OSMR over-expression in SCC cells. TGM2 expression correlated with disease progression and with OSMR levels in clinical samples of cervical and oral SCC. TGM2 depletion in cervical SCC cells abrogated OSM-induced migration on fibronectin-coated surfaces and invasiveness through extracellular matrix, while ectopic expression of TGM2 increased cell motility and invasiveness. Confocal microscopy and co-immunoprecipitation assays showed that TGM2 interacted with integrin-α5β1 in the presence of fibronectin in cervical SCC cells, with OSM treatment strengthening the interaction. Importantly, integrin-α5β1 and fibronectin were also over-expressed in cervical and oral SCC, where levels correlated with those of OSMR and TGM2. This combined tissue and in vitro study demonstrates for the first time that stimulation of over-expressed OSMR in cervical SCC cells activates TGM2/integrin-α5β1 interactions and induces pro-malignant changes. We conclude that an OSMR/TGM2/integrin-α5β1/fibronectin pathway is of biological significance in cervical SCC and a candidate for therapeutic targeting.
authors.affiliation: Department of Pathology, University of Cambridge, UK.
authors.forename: Maria M
authors.initials: MM
authors.lastname: Caffarel
authors.forename: Anasuya
authors.initials: A
authors.lastname: Chattopadhyay
authors.forename: Angela M
authors.initials: AM
authors.lastname: Araujo
authors.forename: Julien
authors.initials: J
authors.lastname: Bauer
authors.forename: Cinzia G
authors.initials: CG
authors.lastname: Scarpini
authors.forename: Nicholas
authors.initials: N
authors.lastname: Coleman
mesh_terms: D015153:Blotting, Western; D002294:Carcinoma, Squamous Cell / Q000378:metabolism* / Q000473:pathology; D005260:Female; D005353:Fibronectins / Q000378:metabolism; D005455:Fluorescent Antibody Technique; D019204:GTP-Binding Proteins / Q000378:metabolism*; D006801:Humans; D007150:Immunohistochemistry; D047468:Immunoprecipitation; D039081:Integrin alpha5beta1 / Q000378:metabolism; D018613:Microscopy, Confocal; D009361:Neoplasm Invasiveness / Q000473:pathology; D020411:Oligonucleotide Array Sequence Analysis; D000091345:Protein Glutamine gamma Glutamyltransferase 2; D060888:Real-Time Polymerase Chain Reaction; D053677:Receptors, Oncostatin M / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology*; D046888:Tissue Array Analysis; D011503:Transglutaminases / Q000378:metabolism*; D015854:Up-Regulation; D002583:Uterine Cervical Neoplasms / Q000378:metabolism* / Q000473:pathology
chemical_list: D005353:Fibronectins; D039081:Integrin alpha5beta1; D053677:Receptors, Oncostatin M; C000717608:TGM2 protein, human; D000091345:Protein Glutamine gamma Glutamyltransferase 2; D011503:Transglutaminases; D019204:GTP-Binding Proteins
keywords: cell migration; fibronectin; integrin-α5β1; invasion; oncostatin M receptor; squamous cell carcinoma; tissue transglutaminase