title: Epidermal growth factor receptor-mediated membrane type 1 matrix metalloproteinase endocytosis regulates the transition between invasive versus expansive growth of ovarian carcinoma cells in three-dimensional collagen.
abstract: The epidermal growth factor receptor (EGFR) is overexpressed in ovarian carcinomas and promotes cellular responses that contribute to ovarian cancer pathobiology. In addition to modulation of mitogenic and motogenic behavior, emerging data identify EGFR activation as a novel mechanism for rapid modification of the cell surface proteome. The transmembrane collagenase membrane type 1 matrix metalloproteinase (MT1-MMP, MMP-14) is a major contributor to pericelluar proteolysis in the ovarian carcinoma microenvironment and is subjected to extensive posttranslational regulation. In the present study, the contribution of EGFR activation to control of MT1-MMP cell surface dynamics was investigated. Unstimulated ovarian cancer cells display caveolar colocalization of EGFR and MT1-MMP, whereas EGFR activation prompts internalization via distinct endocytic pathways. EGF treatment results in phosphorylation of the MT1-MMP cytoplasmic tail, and cells expressing a tyrosine mutated form of MT1-MMP (MT1-MMP-Y(573)F) exhibit defective MT1-MMP internalization. As a result of sustained cell surface MT1-MMP activity, a phenotypic epithelial-mesenchymal transition is observed, characterized by enhanced migration and collagen invasion, whereas growth within three-dimensional collagen gels is inhibited. These data support an EGFR-dependent mechanism for regulation of the transition between invasive and expansive growth of ovarian carcinoma cells via modulation of MT1-MMP cell surface dynamics.
authors.affiliation: Departments of Cell Biology, Northwestern University, Chicago, Illinois, USA.
authors.forename: Natalie M
authors.initials: NM
authors.lastname: Moss
authors.forename: Yueying
authors.initials: Y
authors.lastname: Liu
authors.forename: Jeff J
authors.initials: JJ
authors.lastname: Johnson
authors.forename: Philip
authors.initials: P
authors.lastname: Debiase
authors.forename: Jonathan
authors.initials: J
authors.lastname: Jones
authors.forename: Laurie G
authors.initials: LG
authors.lastname: Hudson
authors.forename: Hidayatullah G
authors.initials: HG
authors.lastname: Munshi
authors.forename: M Sharon
authors.initials: MS
authors.lastname: Stack
mesh_terms: D045744:Cell Line, Tumor; D049109:Cell Proliferation; D003094:Collagen / Q000378:metabolism; D004705:Endocytosis / Q000502:physiology*; D004815:Epidermal Growth Factor / Q000378:metabolism*; D066246:ErbB Receptors / Q000378:metabolism*; D005260:Female; D005434:Flow Cytometry; D006801:Humans; D053511:Matrix Metalloproteinase 14 / Q000235:genetics / Q000378:metabolism*; D008856:Microscopy, Fluorescence; D009154:Mutation; D009361:Neoplasm Invasiveness; D009362:Neoplasm Metastasis; D010051:Ovarian Neoplasms / Q000378:metabolism* / Q000473:pathology; D021381:Protein Transport; D054457:Tissue Scaffolds
chemical_list: D004815:Epidermal Growth Factor; D003094:Collagen; D066246:ErbB Receptors; D053511:Matrix Metalloproteinase 14