摘要
目的采用血清生理学方法,观察添加维生素的盐亭食管癌高发区饮食喂饲大鼠血清对人食管癌细胞株Eca-109生长增殖的影响。方法将SD大鼠随机分为6组,每组10只。分别喂饲大鼠常规饲料、盐亭饮食、盐亭饮食添加两组维生素〔组合:维生素A、E、叶酸,组合:维生素A、E、叶酸、维生素B2(核黄素)、C;两组合均设高、低两个剂量〕。喂饲30d后取大鼠血清培养人食管癌细胞株Eca-109和人正常肝上皮细胞株HL7702。采用MTT、3H-TDR掺入实验及流式细胞术研究不同饮食喂饲大鼠血清对两株细胞生长增殖的影响。结果与小牛血清对照相比,大鼠常规饲料喂饲大鼠血清对两株细胞生长增殖作用相近(P>0.05);盐亭饮食喂饲大鼠血清可促进Eca-109细胞生长增殖,但抑制HL7702细胞生长增殖;添加维生素后,高剂量维生素组抑制Eca-109细胞增殖和促进HL7702细胞增殖的作用均强于低剂量组(P<0.05);高剂量组引起Eca-109细胞生长周期G1期阻滞,但可促进HL7702细胞进入S期及G2期(P<0.05)。结论盐亭饮食可促进人食管癌细胞Eca-109生长增殖,而添加维生素可逆转该作用,细胞生长周期G1期阻滞可能是维生素抑制癌细胞生长增殖的机制之一。
Objective The effects of sera of rats fed the Yanting diet （YT diet） on growth and proliferation of the human esophageal cancer cell line Eca-109 were observed by the means of sero-physiology. Methods The male SD rats, randomly divided into six groups with ten each, were fed a conventional diet and five experimental diets, i.e. YT diet, the YT diet with two vitamin mixtures （Mix. 1, vit. A, E and folic acid; Mix. 2 was Mix. 1 plus riboflavin and vit. C） at two doses. After rats fed different diets for 30 days, rats＇ sera were collected and added into medium for cell culture. The effects serum of rats fed different diets on two human cell lines （Eca-109 esophageal cancer cell and HL7702 normal liver epithelium cell） were investigated by means of cell growth curve,^3H-thymidine incorporation and flow cytometric assay. Results By comparison with the control, the sera of rats fed the YT diet significantly promoted Eca-109 cell proliferation but showed inhibitory effects on HL7702 cell. These changes, however, were reversed by supplementation with two vitamin mixtures at high dose, which had more significant effects on either inhibiting Eca-109 cell or promoting HL7702 cell proliferation than the corresponding lower dose. In addition, the high dose of two vitamin mixtures caused G1 arrest of Eca-109 cell, while speeding the HL7702 cell entering into S and G2 of cell cycle. No obvious difference was seen between both serum of rat fed with the conventional diet and calf serum as control to effect on the two cell line growths and proliferations. Conclusion It is indicated that the sera of rats fed with the YT diet could promote the proliferation of human esophageal cancer cell line Eca-109; the YT diet supplemented with vitamin mixtures may have inhibitory effects on Eca-109 cell. The cell cycle arrest of G1 may be one of the mechanisms that the YT diet supplemented with vitamin mixtures inhibited the proliferation of Eca-109 cell.
出处
《四川大学学报（医学版）》
CAS
CSCD
北大核心
2007年第4期624-628,共5页
Journal of Sichuan University(Medical Sciences)
基金
国家自然科学基金(批准号30571559)资助
关键词
食管癌
饮食
维生素
血清生理学
细胞增殖
Esophageal cancer Diet Vitamin Sero-physiology Cell proliferation
