title: [Relationship of the disturbed balance between matrix metalloproteinases and their tissue inhibitors and the invasion of malignant salivary gland tumours].
abstract: OBJECTIVE
  To detect protein expression of MMPs and TIMPs in various salivary gland neoplasms and to investigate their roles in invasion and metastasis of the malignant salivary gland tumors.
  
  
  METHODS
  Immunohistochemistry and Gelatin zymography analyses for MMP-2, MMP-9, MT1-MMP, TIMP-1 and TIMP-2 were performed in 26 malignant and 28 benign salivary gland tumors.
  
  
  RESULTS
  The expression of MMP-2 and MMP-9 was significantly higher in carcinomas than in adenomas (P < 0.05). The MMP-2/TIMP-1 and MMP-2/TIMP-2 was also significantly higher in carcinomas than in adenomas (P < 0.05). There was a cooperated effect among MMP-2, MT1-MMP and TIMP-2. The expression of active MMP-2, proMMP-9 and active MMP-9 was significantly higher in malignant tumors than in benign tumors (P < 0.05).
  
  
  CONCLUSIONS
  MMP-2 and MMP-9 may play important roles in invasion of malignant salivary gland tumors. A disturbed balance between MMP-2, MMP-9, TIMP-1 and TIMP-2 in malignant salivary gland tumors was detected. It was the absolute increase of MMP-2 and MMP-9 to induce the unbalance.
authors.affiliation: Dept. of Oral Pathology, West China College of Stomatology, Sichuan University, Chengdu 610041, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Tian
authors.forename: Yu
authors.initials: Y
authors.lastname: Chen
authors.forename: Ning
authors.initials: N
authors.lastname: Geng
authors.forename: Ming-Zhong
authors.initials: MZ
authors.lastname: Yang
authors.forename: Wei-Ping
authors.initials: WP
authors.lastname: Zhang
mesh_terms: D004792:Enzyme Precursors; D006801:Humans; D007150:Immunohistochemistry; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9; D020782:Matrix Metalloproteinases; D012468:Salivary Gland Neoplasms; D012469:Salivary Glands; D019715:Tissue Inhibitor of Metalloproteinase-1; D019716:Tissue Inhibitor of Metalloproteinase-2
chemical_list: D004792:Enzyme Precursors; C560822:TIMP1 protein, human; C560823:TIMP2 protein, human; D019715:Tissue Inhibitor of Metalloproteinase-1; D019716:Tissue Inhibitor of Metalloproteinase-2; D020782:Matrix Metalloproteinases; C120487:pro-matrix metalloproteinase 9; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9