title: Role of beta1 integrins in adhesion of canine mastocytoma cells to extracellular matrix proteins.
abstract: The interactions of tumor cells with the extracellular matrix (ECM) are a crucial step in invasion and metastasis. Integrins are adhesive molecules forming heterodimers with alpha and beta subunits that play a definitive role in these interactions. In this study, mastocytoma (mast cell tumor: MCT) cell-ECM interaction was investigated using 3 canine MCT cell lines: CM-MC (originating from cutaneous MCT), VI-MC (originating from intestinal MCT), and CoMS (originating from oral MCT). Flow cytometric analysis showed that all cells highly expressed the integrin beta1 and alpha1 through alpha5 subunits and that they moderately expressed the alpha6 subunit. In adhesion studies, CoMS weakly but spontaneously adhered to fibronectin (FN), which was enhanced by phorbol ester (TPA), while CM-MC and VI-MC required cell activation by TPA to adhere to FN. Anti-beta1 and alpha5 integrin antibodies strongly inhibited cell adhesion to FN in CM-MC and CoMS and moderately inhibited cell adhesion in VI-MC. Only VI-MC adhered to laminin (LN) under activation by TPA. Anti-beta1 integrin antibodies strongly inhibited cell adhesion to LN, but all anti-alpha integrin antibodies failed to inhibit cell adhesion to LN. No cells adhered to collagen types I and IV. Canine MCT cells from different origins expressed similar integrin patterns; however, there were some differences in adhesive behavior in response to various ECM proteins and activating stimuli.
authors.affiliation: Laboratory of Comprehensive Veterinary Clinical Studies, Department of Veterinary Medicine, College of Bioresource Sciences, Nihon University, Kameino, Fujisawa, Kanagawa, Japan.
authors.forename: Tomoko
authors.initials: T
authors.lastname: Takahashi
authors.forename: Emi
authors.initials: E
authors.lastname: Ohashi
authors.forename: Takayuki
authors.initials: T
authors.lastname: Nakagawa
authors.forename: Manabu
authors.initials: M
authors.lastname: Mochizuki
authors.forename: Ryohei
authors.initials: R
authors.lastname: Nishimura
authors.forename: Nobuo
authors.initials: N
authors.lastname: Sasaki
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D000911:Antibodies, Monoclonal / Q000494:pharmacology; D002448:Cell Adhesion / Q000187:drug effects / Q000502:physiology*; D045744:Cell Line, Tumor; D004283:Dog Diseases / Q000378:metabolism*; D004285:Dogs; D016326:Extracellular Matrix Proteins / Q000378:metabolism*; D005434:Flow Cytometry / Q000662:veterinary; D039641:Integrin beta Chains / Q000276:immunology / Q000378:metabolism*; D034801:Mastocytoma / Q000378:metabolism / Q000662:veterinary*
chemical_list: D000911:Antibodies, Monoclonal; D016326:Extracellular Matrix Proteins; D039641:Integrin beta Chains