Objective To evaluate the inhibitive effect of tea polyphenol on the growth of human nasopharyngeal carcinoma HONE1 cell xenograft in nude mice ,and to explore the underlying mechanisms .Methods Tumor model was established by subcu‐taneous inoculation of nasopharyngeal carcinoma cell HONE1 into nude mice ,was used to evaluate the antitumor effect of tea poly‐phenol in vivo .The expression levels of VEGF were detected by real‐time PCR and western blot .Results The growth of xenograft in nude mice was significantly suppressed after application of tea polyphenol at a dose‐dependent manner .To compare with control group ,the inhibition rates were 18 .82% (P<0 .05) and 47 .66% (P<0 .05)when treated at low and high dose respectively ,With in‐creased concentration of TP ,the inhibition rates increased .Real‐time fluorescence quantitative‐PCR and western blot results showed that the expression of VEGF decreased at a dose‐dependent manner .The change of high dose group was obviously ,the difference was statistically significant(P<0 .05) .Conclusion Tea polyphenol could significantly inhibit the growth of human nasopharyngeal carcinoma HONE1 cell xenograft in nude mice ,probably by down regulating the VEGF protein level to inhibit tumor angiogenesis effects .

OBJECTIVE: To investigate the effect and mechanism of tea polyphenol (TP) on the proliferation, apoptosis, migration and invasion of nasopharyngeal carcinoma(NPC) cell line HONEl. METHOD: After treated with different concentration of tea polyphenol, CCK-8 assay, fluorescent staining, cell scratching assay and transwell assay were applied to detect the effect of tea polyphenol on the HONE1 cells. Furthermore, the expression of protein VEGF was investigated by flow cytometry assay. RESULT: It was found that tea polyphenol could inhibit NPC cell proliferation significantly in a dose-dependent manner, however, little impact was observed in normal nasopharyngeal epithelial cell line NP69. Furthermore, it was demonstrated by fluorescent staining assay that tea polyphenol could induce NPC cell apoptosis, and cell scratching assay and transwell assay showed that tea polyphenol could inhibit cell migration and invasion. CONCLUSION Tea polyphenol can significantly inhibit cell proliferation, induce cell apoptosis and decreased the migration and invasion ability of NPC cells in vitro. Tea polyphenol might be a tumor suppressor of NPC cells.
Apoptosis ; drug effects ; Carcinoma ; Cell Line, Tumor ; drug effects ; Cell Movement ; drug effects ; Cell Proliferation ; drug effects ; Humans ; Nasopharyngeal Carcinoma ; Nasopharyngeal Neoplasms ; pathology ; Polyphenols ; pharmacology ; Tea ; chemistry