title: Laminin induces matrix metalloproteinase-9 expression and activation in human cervical cancer cell line (SiHa).
abstract: OBJECTIVE
  Interaction between cell surface integrin receptors and extracellular matrix (ECM) components plays an important role in cell survival, proliferation and migration including tumor development and invasion. Matrix metalloproteinases (MMP) are a family of metalloproteinases capable of digesting ECM and facilitate cell migration. Binding of ECM to integrins initiates signaling cascades modulating expression and activity of different MMPs. The present study investigates whether laminin-mediated signaling modulates matrix metalloproteinases (MMP) expression and activity in human cervical cancer cell (SiHa).
  
  
  METHODS
  Western blot, immunocytochemistry, ELISA, zymography, RT-PCR, EMSA and wound-healing assay were used.
  
  
  RESULTS
  Culture of SiHa cells on laminin (LN)-coated surface induces MMP-9 expression and activation. Wound-healing assay showed that SiHa cells migrate much faster on laminin-coated surface than that of control. LN-induced MMP-9 expression and activation was appreciably reduced with treatment of extracellular signal-regulated kinase (ERK) inhibitor, phosphatidylinositol-3-kinase (PI-3K) inhibitor and anti-α2 antibody. Phosphorylation of focal adhesion kinase (FAK), ERK, and PI-3K was increased upon LN stimulation. LN induces nuclear translocation of PI-3K and nuclear factor kappa B (NF-κB). LN increases DNA-binding activity of NF-κB and activator protein-1 (AP-1) to MMP-9 promoter.
  
  
  CONCLUSIONS
  Our findings indicate laminin-induced MMP-9 expression and activation possibly via α2β1 integrin-mediated signaling involving FAK, PI-3K, ERK followed by transcriptional upregulation of MMP-9.
authors.affiliation: Department of Receptor Biology and Tumor Metastasis, Chittaranjan National Cancer Institute, 37, S. P. Mukherjee Road, Kolkata, West Bengal 700026, India.
authors.forename: Gargi
authors.initials: G
authors.lastname: Maity
authors.forename: Triparna
authors.initials: T
authors.lastname: Sen
authors.forename: Amitava
authors.initials: A
authors.lastname: Chatterjee
mesh_terms: D015153:Blotting, Western; D045744:Cell Line, Tumor; D002465:Cell Movement; D024202:Electrophoretic Mobility Shift Assay; D004789:Enzyme Activation; D004797:Enzyme-Linked Immunosorbent Assay; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism; D005260:Female; D051417:Focal Adhesion Kinase 1 / Q000378:metabolism; D015971:Gene Expression Regulation, Enzymologic; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D007150:Immunohistochemistry; D038982:Integrin alpha2beta1 / Q000378:metabolism; D007797:Laminin / Q000378:metabolism*; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism*; D016328:NF-kappa B / Q000378:metabolism; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction; D002583:Uterine Cervical Neoplasms / Q000201:enzymology / Q000378:metabolism*; D014945:Wound Healing
chemical_list: D038982:Integrin alpha2beta1; D007797:Laminin; D016328:NF-kappa B; D019869:Phosphatidylinositol 3-Kinases; D051417:Focal Adhesion Kinase 1; C496050:PTK2 protein, human; D048049:Extracellular Signal-Regulated MAP Kinases; D020780:Matrix Metalloproteinase 9