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槐耳清膏對結腸癌SW480細胞增殖能力影響及其機制探討

摘要:目的:探索槐耳清膏對體結腸癌SW480細胞增殖能力影響及其機制。方法:采用噻唑藍(MTT)比色法檢測槐耳清膏對SW480細胞增殖能力的作用,并探求最佳作用濃度;將體外培養細胞隨機分為常氧組(NC組)、低氧組(HC組)和低氧槐耳組(HH組),逆轉錄聚合酶鏈反應（RTPCR）檢測各組血管內皮生長因子(VEGF) mRNA表達水平,Western blot檢測蛋白表達水平。結果:槐耳清膏對SW480細胞抑制率隨藥物濃度增加而上升,1 mg/mL時抑制率最大(66.7%),與氟尿嘧啶組(濃度為10 μg/mL)相比無統計學意義。HH組和HC組VEGF mRNA表達均顯著高于NC組,分別為4.71±0.07,4.54±0.02和1.19±0.03(P＜0.05),但HH組與HC組比較差異無統計學意義。HC組VEGF蛋白表達顯著高于NC組,分別為0.66±0.03和0.38±0.02(P＜0.05),HH組較HC組VEGF蛋白表達均顯著下降,分別為0.37±0.03和0.66±0.03(P＜0.05)。結論:槐耳清膏可抑制SW480細胞增殖,1 mg/mL時抑制率最大。其機制為槐耳清膏下調細胞內VEGF蛋白表達,從而抑制腫瘤生長。Abstract: Objective: To investigate the effect of Huaier cream on proliferation of colon cancer cells SW480 and its mechanism. Methods: The proliferation was analyzed by MTT. SW480 cells were randomly divided into normoxic group (NC group), hypoxia group (HC group) and hypoxia group treated by Huaier (HH group). Levels of mRNA and protein expression of VEGF were detected by RTPCR and Western blot, respectively． Results: Huaier cream induced a dosedependent inhibition of SW480 cells. The maximum percentage of growth inhibition was 66.7% at a concentration of 1.0 mg/mL, but no significant difference was found compared to the positive control (5FU 10 μg/mL). VEGF mRNA levels were significantly higher in HC group and HH group than in NC group (4.71±0.07, 4.54±0.02 vs 1.19±0.03, all Plt;0.05), but not significantly different between HC group and HH group. VEGF protein expression was higher in HC group than NC group (0.66±0.03 vs 0.38±0.02, Plt;0.05). In HH group, VEGF protein was inhibited remarkably compared with HC group (0.37±0.03 vs 0.66±0.03, Plt;0.05). Conclusion: Huaier cream can significantly inhibit SW480 cells and the top inhibition concentration is 1.0 mg/mL. Huaier cream plays a role in inhibiting tumor through downregulating protein expression of VEGF.