title: c-Src-dependent cross-talk between CEACAM6 and alphavbeta3 integrin enhances pancreatic adenocarcinoma cell adhesion to extracellular matrix components.
abstract: Carcinoembryonic antigen-related cell adhesion molecule 6 (CEACAM6) is an immunoglobulin superfamily member with a diversity of extracellular ligands that is implicated in the initiation and progression of a variety of malignancies. We sought to characterize the effects of CEACAM6 crosslinking on pancreatic adenocarcinoma cellular interaction with the extracellular matrix (ECM) components fibronectin and vitronectin. Antibody-mediated CEACAM6 crosslinking was performed and the ability of BxPC3 cells, which inherently overexpress CEACAM6, to adhere to fibronectin and vitronectin was quantified. The roles of the archetypal fibronectin (alpha5beta1 integrin) and vitronectin (alphavbeta3 integrin) receptors were determined. The effects of c-Src inhibition were investigated using the Src family kinase inhibitor 4-amino-5-(4-chlorophenyl)-7-(t-butyl)pyrazolo[3,4-d]pyrimidine (PP2) and c-Src specific RNA interference. CEACAM6 crosslinking initiates c-Src-dependent cross-talk between CEACAM6 and alphavbeta3 integrin, leading to increased ECM component adhesion. CEACAM6-mediated signaling events may contribute to the invasive and metastatic potential of pancreatic adenocarcinoma cells by promoting their interaction with ECM components.
authors.affiliation: Department of Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.
authors.forename: Mark S
authors.initials: MS
authors.lastname: Duxbury
authors.forename: Hiromichi
authors.initials: H
authors.lastname: Ito
authors.forename: Stanley W
authors.initials: SW
authors.lastname: Ashley
authors.forename: Edward E
authors.initials: EE
authors.lastname: Whang
mesh_terms: D000230:Adenocarcinoma / Q000378:metabolism / Q000473:pathology*; D000911:Antibodies, Monoclonal / Q000494:pharmacology; D015703:Antigens, CD; D000951:Antigens, Neoplasm / Q000737:chemistry / Q000378:metabolism*; D002448:Cell Adhesion / Q000502:physiology; D015815:Cell Adhesion Molecules / Q000737:chemistry / Q000378:metabolism*; D003432:Cross-Linking Reagents / Q000494:pharmacology; D005109:Extracellular Matrix / Q000378:metabolism* / Q000473:pathology; D005353:Fibronectins / Q000378:metabolism; D005434:Flow Cytometry; D058851:GPI-Linked Proteins; D006801:Humans; D039302:Integrin alphaVbeta3 / Q000378:metabolism*; D010190:Pancreatic Neoplasms / Q000378:metabolism / Q000473:pathology*; D034741:RNA, Small Interfering / Q000235:genetics; D014162:Transfection; D014407:Tumor Cells, Cultured; D019096:Vitronectin / Q000378:metabolism; D019061:src-Family Kinases / Q000235:genetics / Q000378:metabolism*
chemical_list: D000911:Antibodies, Monoclonal; D015703:Antigens, CD; D000951:Antigens, Neoplasm; C504117:CEACAM6 protein, human; D015815:Cell Adhesion Molecules; D003432:Cross-Linking Reagents; D005353:Fibronectins; D058851:GPI-Linked Proteins; D039302:Integrin alphaVbeta3; D034741:RNA, Small Interfering; D019096:Vitronectin; D019061:src-Family Kinases