[Effects of Ezrin gene on the proliferation and invasion activity of human salivary gland adenoid cystic carcinoma].
OBJECTIVE
To examine the expression of Ezrin in human salivary gland adenoid cystic carcinoma and investigate the effects of Ezrin gene silence on cell proliferation, apoptosis and invasion of adenoid cystic carcinoma (ACC)-M.


METHODS
The expression of Ezrin was detected by immunohistochemistry in normal salivary gland tissue (n=15), pleomorphic adenoma (n=40) and salivary gland adenoid cystic carcinoma (n=43). The Ezrin Stealth RNAi Duplex, containing Stealth RNAi Negative Control Duplex were constructed and transfected into ACC-M cells by Lipofectamine 2000. The expression levels of Ezrin were detected by RT-PCR and immunohistochemistry. The cell cycle and apoptosis rate were analyzed by flow cytometry (FCM). The cell proliferation was detected by methyl thiazolyl tetrazolium (MTT) and cell invasion by Transwell test.


RESULTS
The positive rate of Ezrin expression in ACC was significantly higher than that in normal salivary gland tissue and pleomorphic adenoma (P<0.05). After transfection of Ezrin Stealth RNAi Duplex, the mRNA and protein expression of Ezrin were down-regulated, the cell proliferation activity was inhibited, the G0-G1 Phase cells were increased, and the apoptosis rate of Ezrin Stealth RNAi Duplex group was higher than that in control groups and cell invasion ability was decreased.


CONCLUSIONS
Over expression of Ezrin in human salivary gland adenoid cystic carcinoma may promote genesis, development and metastasis of tumors. Ezrin Stealth RNAi Duplex could efficiently down-regulate the expression of Ezrin gene, and partly inhibited proliferation of ACC-M cells, induce apoptosis and decrease invasion ability of these cells in vitro.
Wang
You-yuan
YY
Department of Oral and Maxillofacial Surgery, The Second Affiliated Hospital, Sun Yat-sen University, Guangzhou 510120, China.
Chen
Wei-liang
WL
Yang
Zhao-hui
ZH
Huang
Zhi-quan
ZQ
Li
Jin-song
JS
Pan
Chao-bin
CB
D017209:Apoptosis; D003528:Carcinoma, Adenoid Cystic / Q000235:genetics* / Q000473:pathology*; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D003598:Cytoskeletal Proteins / Q000235:genetics*; D015870:Gene Expression; D006801:Humans; D009361:Neoplasm Invasiveness; D009362:Neoplasm Metastasis; D012468:Salivary Gland Neoplasms / Q000235:genetics* / Q000473:pathology*; D000099149:Ezrin
D003598:Cytoskeletal Proteins; D000099149:Ezrin