title: Inhibition of TGF-β and EGF pathway gene expression and migration of oral carcinoma cells by mucosa-associated lymphoid tissue 1.
abstract: BACKGROUND
  Expression of mucosa-associated lymphoid tissue 1 (MALT1) is inactivated in oral carcinoma patients with worse prognosis. However, the role in carcinoma progression is unknown. Unveiling genes under the control of MALT1 is necessary to understand the pathology of carcinomas.
  
  
  METHODS
  Gene data set differentially transcribed in MALT1-stably expressing and -marginally expressing oral carcinoma cells was profiled by the microarray analysis and subjected to the pathway analysis. Migratory abilities of cells in response to MALT1 were determined by wound-healing assay and time-lapse analysis.
  
  
  RESULTS
  Totally, 2933 genes upregulated or downregulated in MALT1-expressing cells were identified. The subsequent pathway analysis implicated the inhibition of epidermal growth factor and transforming growth factor-β signalling gene expression, and highlighted the involvement in the cellular movement. Wound closure was suppressed by wild-type MALT1 (66.4%) and accelerated by dominant-negative MALT1 (218.6%), and the velocities of cell migration were increased 0.2-fold and 3.0-fold by wild-type and dominant-negative MALT1, respectively.
  
  
  CONCLUSIONS
  These observations demonstrate that MALT1 represses genes activating the aggressive phenotype of carcinoma cells, and suggest that MALT1 acts as a tumour suppressor and that the loss of expression stimulates oral carcinoma progression.
authors.affiliation: Department of Oral and Maxillofacial Surgery 2, Meikai University, 1-1 Keyakidai, Sakado, Saitama 350-0283, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Ohyama
authors.forename: Y
authors.initials: Y
authors.lastname: Kawamoto
authors.forename: T
authors.initials: T
authors.lastname: Chiba
authors.forename: G
authors.initials: G
authors.lastname: Maeda
authors.forename: H
authors.initials: H
authors.lastname: Sakashita
authors.forename: K
authors.initials: K
authors.lastname: Imai
mesh_terms: D020169:Caspases / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism*; D045744:Cell Line, Tumor; D002465:Cell Movement; D018450:Disease Progression; D004789:Enzyme Activation; D004815:Epidermal Growth Factor / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008221:Lymphoid Tissue / Q000378:metabolism; D009062:Mouth Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000473:pathology*; D000074884:Mucosa-Associated Lymphoid Tissue Lymphoma Translocation 1 Protein; D016328:NF-kappa B / Q000378:metabolism; D009363:Neoplasm Proteins / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism*; D034622:RNA Interference; D034741:RNA, Small Interfering; D015398:Signal Transduction; D016212:Transforming Growth Factor beta / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*
chemical_list: D016328:NF-kappa B; D009363:Neoplasm Proteins; D034741:RNA, Small Interfering; D016212:Transforming Growth Factor beta; D004815:Epidermal Growth Factor; D020169:Caspases; C400109:MALT1 protein, human; D000074884:Mucosa-Associated Lymphoid Tissue Lymphoma Translocation 1 Protein