膳食纤维与植酸对1,2-二甲肼诱导大鼠结直肠癌发生的作用  

EFFECT OF DIETARY FIBER AND PHYTIC ACID ON 1,2-DIMETHYLHYDRAZINE INDUCED COLORECTAL CARCINOGENESIS

作　　者：宋扬[1] 张海平[2] 张铮[1] 

机构地区：[1]青岛大学医学院医学营养研究所,青岛266021 [2]青岛大学医学院附属青岛市市立医院

出　　处：《营养学报》2005年第2期155-158,共4页Acta Nutrimenta Sinica

基　　金：山东省卫生厅青年科研基金(No.1999CA2CBA2)

摘　　要：目的:考察膳食纤维与植酸对动物模型结直肠癌发生的作用。方法:用86只4w龄雄性Wistar大鼠,按体重随机分为纤维素组、果胶组、植酸组、纤维素+植酸组、果胶+植酸组和对照组六组,用1,2-二甲肼(DMH)皮下注射诱发结直肠癌,观察大鼠结直结直肠肿瘤的发生率、肿瘤的数量及体积;测定大鼠结肠粘膜细胞的增殖活性。结果:各组大鼠结直肠肿瘤的发生率与对照组相比无显著性差异,但植酸组平均每只鼠的肿瘤个数和肿瘤体积显著低于对照组;果胶组、果胶+植酸组平均每只鼠的肿瘤个数显著高于对照组。植酸组大鼠结直肠粘膜细胞的增殖活性比对照组显著降低。果胶组大鼠结直肠粘膜细胞的增殖活性比对照组显著升高。结论:膳食中添加果胶能增加诱癌大鼠患结直肠肿瘤的危险,而饮水中添加2%的植酸可降低诱癌大鼠患结直肠肿瘤的危险。Objective: To evaluate the effect of dietary fiber and phytic acid inositol hexaphosphate (IP6 or Insp6) on 1,2-dimethylhydrazine(DMH) induced colorectal carcinogenesis in Wistar rats. Methods: 86 four-week-old male Wistar rats were divided randomly into 6 groups and fed with either basal fiber free diet or the basal diet supplemented with 10% pectin, 10% cellulose, 2% Na-InsP6 supplemented water, 10% pectin in combination with 2% Na-InsP6 supplemented water, 10% cellulose in combination with 2% Na-InsP6 supplemented water. After four weeks, the rats were given a weekly injection of DMH (20mg/kg bw) for 20 weeks. The rats were killed after 26 weeks. The number of total macroscopically visible neoplasms was counted and the volume of individual neoplasmas was calculated. Proliferation cell nuclear antigen (PCNA) was analyzed. Results: There was no significant difference between the treatment group and the control group in the incidence of tumors. InsP6 significantly reduced the number of tumors in rats and tumor volume. Pectin and Pectin+InsP6 significantly increased the number of tumors in rats. The expression of proliferation marker PCNA was significantly down-regulated by InsP6 and significantly increased by pectin. Conclusion: A treatment regimen of 2% Na-InsP6 in drinking water was effective in significantly reducing the risk of colorectal cancer in Wistar rats. Diet supplemented with pectin could increase the risk of colorectal cancer.

关 键 词：结直肠癌 植酸 膳食纤维 纤维素 果胶 

分 类 号：R735.37[医药卫生—肿瘤]