Influence of FOXC1 downregulating on biological behavior of nasopharyngeal carcinoma (NPC) 5-8F cell lines / 实用医学杂志

Objective To investigate the Influence of FOXC1 downregulating on biological behavior of nasopharyngeal carcinoma (NPC) 5-8F cell lines. Methods Western blotting was used to detect the protein levels of FOXC1 in human immortalized nasopharyngeal cell lines NP69, nasopharyngeal carcinoma cell lines 6-10B with lower metastasis potential and nasopharyngeal carcinoma cell lines 5-8F with higher metastasis potential. siRNA was used to downregulate the expression of FOXC1 in 5-8F cell lines, and then ability of migration and invasion were observed. Results FOXC1 protein expression level in NP69 cell lines, 6-10B cell lines and 5-8F cell lines were (0.27 ± 0.04), (0.7 ± 20.06), (1.08 ± 0.05) respectively, and the difference was statistically significant (P < 0.05). Also ability of cell migration and invasion significantly weakened after FOXC1 depletion in 5-8F cell lines (P < 0.05). Conclusion FOXC1 might regulate invasion and metastasis of nasopharyngeal carcinoma through changing expression of Fibronectin and Vimentin, and FOXC1 may be an available target for molecular target therapy of nasopharyngeal carcinoma.

Signifinace of cyclin D1 expression in CNE2 cells processed by EGCG / 临床耳鼻咽喉头颈外科杂志

OBJECTIVE@#To study the expression of Cyclin D1 in nasopharyngeal carcinoma cells processed by epigallocatechin gallate(EGCG) and it's significance, and revealed the anti-tumor mechanism of EGCG against nasopharyngeal carcinoma.@*METHOD@#CNE-2 cells were treated by EGCG at different concentrations, the morphological changes of CNE-2 cells were observed by inverted microscope; the inhibition ratio of cell proliferation was detected by MTT colorimetric method, flow cytometry was used to analyze the changes of cell cycle. The expression of Cyclin D1 mRNA was detected by RT-PCR.@*RESULT@#After treated by EGCG, the CNE2 cells decreased in amount and density, some of which became roll and small; Floating and dead cells can be seen in the inverted microscopy; cell proliferation was significantly inhibited in a time and dose dependent (P < 0.05). CNE-2 cells were arrested at G1/G0 phase. The expression of Cyclin D1 mRNA was down-regulated by EGCG with concentration and action time dependent (P < 0.05).@*CONCLUSION@#EGCG resisted nasopharyngeal carcinoma by inhibiting the cell proliferation, The down regulation of Cyclin D1 mRNA expression in a time and dose dependent may be the possible mechanisms.

Expression of FOXC1 and its relationship with E-cadherin in nasopharyngeal carcinoma tissues / 临床耳鼻咽喉头颈外科杂志

OBJECTIVE@#To investigate the significance and relationship between the expression of FOXC1 and clinicopathological features, and to explore its correlation with E-cadherin.@*METHOD@#Immunohistochemical SP method was used to detected the expression of FOXC1 in nasopharyngeal carcinoma tissues and nasopharyngitis tissues.@*RESULT@#(1) Immunoreaction to FOXC1 was mainly located in nucleus of nasopharyngeal carcinoma cells. The positive expression rate of FOXC1 in nasopharyngeal carcinoma tissues was 85.3% (81/95), which was significantly higher than that in nasopharyngitis tissues (59.4%) (P 0.05). (3) There was a correlation between the expression of FOXC1 and down-regulated expression of E-cadherin in nasopharyngeal carcinoma tissues (P < 0.05).@*CONCLUSION@#FOXC1 may play an important role in generation and progression of nasopharyngeal carcinoma, there may be a correlation between the expression of FOXC1 and down-regulated expression of E-cadherin, also FOXC1 may play an important role in the process of EMT in nasopharyngeal carcinoma by regulating E-cadherin.

Effects of EGCG on the nasopharyngeal carcinoma cell line CNE-2 and the expression of related gene / 临床耳鼻咽喉头颈外科杂志

OBJECTIVE@#To study the effects of epigallocatechin-3-gallate (EGCG) on proliferation and apoptosis of nasopharyngeal carcinoma CNE-2 cell line and analyze the expression of Bcl-2, Bax and Caspase-3 in the cell line which treated with EGCG.@*METHOD@#MTT assay and flow cytometry were used to analyze cell proliferation and cell cycle. Hoechst33258 fluorescence staining was adopted to study cell apoptosis. RT-PCR was used to detect the expression of Bcl-2, Bax, Caspase-3.@*RESULT@#EGCG could significantly inhibit proliferation of CNE-2 cell line and induce its apoptosis with dose-independent relationship. EGCG could suppress the expression of Bcl-2 and induce expression of Bax, Caspase-3.@*CONCLUSION@#EGCG in vitro has efficacy of anti-nasopharyngeal carcinoma cells, which may be through regulating the expression of cell proliferation and apoptosis genes involved.