title: The FN13 peptide inhibits human tumor cells invasion through the modulation of alpha v beta 3 integrins organization and the inactivation of ILK pathway.
abstract: We report the effect of the stable expression of a 13 amino acid human fibronectin (FN) peptide (FN13) on the organization of the FN extracellular matrix (ECM) and of FN integrin receptors (FNRs), in relationship with the inhibition of cellular invasion, in three FN-ECM defective human tumor-derived cell lines: SK-Hep1C3, hepatoma, ACN, neuroblastoma, and SK-OV-3, ovary carcinoma. All these cell lines stably expressing the FN13 peptide, organized an FN-ECM, disorganized alpha v beta 1 integrins and inactivated the ILK pathway, with the loss of secretion of MMP-9. This was associated with the inhibition of cell invasion in Matrigel matrix only in SK-Hep1C3 and ACN, but not in SK-OV-3 cells. Analysis of the integrin receptors organization showed that the FN13 expressing cells SK-Hep1C3 and ACN organized alpha v beta 3 integrins, whereas SK-OV-3 organized alpha v beta 5 dimers. The functional block of alpha v beta 5 integrins, with an inactivating anti-alpha v beta 5 antibody, led to the induction of alpha v beta 3 integrins also in SK-OV-3 cells, and to the inhibition of cell invasion. These data show that in the human tumor cells studied FN13 inhibits the in vitro invasion through the dissociation of alpha v beta 1 dimers, leading to ILK pathway inactivation, only when the organization of alpha v beta 3 integrins is induced in the plasma membrane.
authors: Division of Biology and Genetics, Department of Biomedical Sciences and Biotechnology, University of Brescia, Viale Europa 11, 25123 Brescia, Italy.
authors: Nicoletta
authors: N
authors: Zoppi
authors: Marco
authors: M
authors: Ritelli
authors: Alessandro
authors: A
authors: Salvi
authors: Marina
authors: M
authors: Colombi
authors: Sergio
authors: S
authors: Barlati
mesh_terms: D045744:Cell Line, Tumor; D002462:Cell Membrane / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D019281:Dimerization; D005353:Fibronectins / Q000096:biosynthesis* / Q000235:genetics; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D039302:Integrin alphaVbeta3 / Q000378:metabolism*; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism; D009361:Neoplasm Invasiveness; D009363:Neoplasm Proteins / Q000235:genetics / Q000378:metabolism*; D009369:Neoplasms / Q000201:enzymology* / Q000235:genetics / Q000473:pathology; D010455:Peptides / Q000235:genetics / Q000378:metabolism*; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction; D000099200:Scaffold Protein ILK
chemical_list: D005353:Fibronectins; D039302:Integrin alphaVbeta3; D020780:Matrix Metalloproteinase 9; D009363:Neoplasm Proteins; D010455:Peptides; D017346:Protein Serine-Threonine Kinases; D000099200:Scaffold Protein ILK