Inhibition of ameloblastoma invasion in vitro and in vivo by inhibitor of metalloproteinase-2 activity.
BACKGROUND
Ameloblastoma is an odontogenic benign tumor characterized by local invasiveness and most of its local recurrences clinically result from local invasion. This study used matrix metalloproteinase-2 (MMP-2) inhibitor I (MMP-2I) to investigate the role played by MMP-2 activity in the local invasiveness of ameloblastoma.


METHODS
The cells and xenografts of ameloblastoma were treated with MMP-2I and treatment group were compared with the control group. In vitro, the invasive activity of tumor cells was assayed in transwell cell culture chamber. Gelatinolytic activity of gelatinases and MMP-2/tissue inhibitor of matrix metalloproteinase (TIMP-2) protein expression was detected using gelatin zymography and flow cytometry. The cell viability and adhesion were evaluated using methyl thiazol tetrazolium. In vivo, bilateral subrenal capsule xenograft transplantation of ameloblastoma was performed in 10 nude mice and the invasion of ameloblastoma into the renal parenchyma was observed.


RESULTS
Active-MMP-2 of conditioned media was significantly lower in treatment group than in the control group. Accordingly, potential of in vitro cell invasion, adhesion and in vivo tumor invasion were also significantly lower in the treatment group than in the control group.


CONCLUSIONS
Inhibitor of MMP-2 activity suppressed the local invasive capability of ameloblastoma by decreasing MMP-2 activity. MMP-2 activity is in relation with invasive capacity of ameloblastoma.
Zhang
Bin
B
Department of Oral and Maxillofacial Surgery, The Second Affiliated Hospital, Sun Yat-Sen University, Guangzhou, China.
Zhang
Jin
J
Huang
Hong-Zhang
HZ
Chen
Wei-Liang
WL
Tao
Qian
Q
Zeng
Dong-Lin
DL
Zhang
Lei-Tao
LT
Xu
Jian-Hui
JH
D000564:Ameloblastoma / Q000188:drug therapy / Q000201:enzymology*; D000818:Animals; D006801:Humans; D007573:Jaw Neoplasms / Q000188:drug therapy / Q000201:enzymology*; D020778:Matrix Metalloproteinase 2 / Q000502:physiology; D061965:Matrix Metalloproteinase Inhibitors; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D009361:Neoplasm Invasiveness; D009368:Neoplasm Transplantation; D019716:Tissue Inhibitor of Metalloproteinase-2 / Q000494:pharmacology* / Q000627:therapeutic use; D014407:Tumor Cells, Cultured
D061965:Matrix Metalloproteinase Inhibitors; D019716:Tissue Inhibitor of Metalloproteinase-2; D020778:Matrix Metalloproteinase 2