title: Culture of human breast cancer cell line (MDA-MB-231) on fibronectin-coated surface induces pro-matrix metalloproteinase-9 expression and activity.
abstract: Interaction between cell surface integrin receptors with extracellular matrix (ECM) plays an important role in cell survival, proliferation, and migration including tumor development and invasion. Binding of ECM to integrins initiates intracellular signaling cascades, modulating expression and activity of different matrix metalloproteinases (MMPs) which is important in ECM degradation. The present study investigates fibronectin-integrin-mediated signaling and thereby modulation of MMPs expression and activity in human breast cancer cell line, MDA-MB-231. Culture of MDA-MB-231 cells on fibronectin (FN) induced expression and activity of pro-matrixmetalloproteinase-9 (MMP-9). Appreciable reduction of FN-induced pro-MMP-9 activity was observed in anti-α5 antibody treated cells. Inhibitor studies revealed that inhibitors of phosphatidyl inositiol-3-kinase (PI-3K), and nuclear factor kappa B (NF-κB) inhibited FN-induced pro-MMP-9 activity. FN increased tyrosine phosphorylation of focal adhesion kinase (FAK), integrin linked kinase (ILK), and PI-3K in MDA-MB-231 cells. FN-induced the transactivation of MMP-9 promoter by enhancing DNA binding activity of NF-κB and Sp1. Wound healing assay showed faster migration of MDA-MB-231cells grown on fibronectin-coated as surface as compared to control. Our findings indicated that culture of MDA-MB-231 on fibronectin perhaps send signals via fibronectin-integrin-mediated signaling pathways recruiting FAK, PI-3K, ILK, NF-κB, and modulate expression and activation of pro-MMP-9. These observations may enrich fundamental aspects of cancer biology especially role of α5β1 integrin in regulation of MMPs expression and activity.
authors.affiliation: Department of Receptor Biology and Tumor Metastasis, Chittaranjan National Cancer Institute, 37, S. P. Mukherjee Road, Kolkata 700026, West Bengal, India.
authors.forename: Gargi
authors.initials: G
authors.lastname: Maity
authors.forename: Paromita Roy
authors.initials: PR
authors.lastname: Choudhury
authors.forename: Triparna
authors.initials: T
authors.lastname: Sen
authors.forename: Kirat Kumar
authors.initials: KK
authors.lastname: Ganguly
authors.forename: Hrishikesh
authors.initials: H
authors.lastname: Sil
authors.forename: Amitava
authors.initials: A
authors.lastname: Chatterjee
mesh_terms: D015153:Blotting, Western; D001943:Breast Neoplasms / Q000188:drug therapy / Q000378:metabolism / Q000473:pathology*; D002448:Cell Adhesion / Q000187:drug effects*; D045744:Cell Line, Tumor; D002465:Cell Movement; D049109:Cell Proliferation; D024202:Electrophoretic Mobility Shift Assay; D004792:Enzyme Precursors / Q000235:genetics / Q000378:metabolism*; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005353:Fibronectins / Q000494:pharmacology*; D005434:Flow Cytometry; D051416:Focal Adhesion Protein-Tyrosine Kinases / Q000235:genetics / Q000378:metabolism; D006801:Humans; D039081:Integrin alpha5beta1 / Q000378:metabolism; D020780:Matrix Metalloproteinase 9 / Q000235:genetics / Q000378:metabolism*; D016328:NF-kappa B / Q000235:genetics / Q000378:metabolism; D058539:Phosphatidylinositol 3-Kinase / Q000378:metabolism; D010766:Phosphorylation; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction; D000099200:Scaffold Protein ILK
chemical_list: D004792:Enzyme Precursors; D005353:Fibronectins; D051416:Focal Adhesion Protein-Tyrosine Kinases; D039081:Integrin alpha5beta1; D020780:Matrix Metalloproteinase 9; D016328:NF-kappa B; D058539:Phosphatidylinositol 3-Kinase; D017346:Protein Serine-Threonine Kinases; D012333:RNA, Messenger; D000099200:Scaffold Protein ILK; C120487:pro-matrix metalloproteinase 9
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