APCmin/+小鼠缺失维生素D受体对肠道肿瘤生长的影响

目的 探讨维生素D受体(VDR)失活对APCmin/+小鼠肠道肿瘤生长的影响及机制.方法 通过构建APCmin/+VDR-/-小鼠模型(n=8),与APCmin/+小鼠比较(n=8),4月龄时观察肠道肿瘤大小及数目情况,肿瘤作HE染色以判断病理类型,免疫组化检测肿瘤相关基因BCL-2、vimentin-1、Stat-1和MSH-2蛋白的表达.结果 4月龄时2组鼠比较,APCmin/+VDR-/-小鼠>3 mm肿瘤明显增多(P<0.01).HE染色显示肠道肿瘤为管状腺瘤.APCmin/+肿瘤的Stat-1表达较强,而MSH-2和vi-mentin-1表达在APCmin/+VDR-/-肿瘤中均更强.结论 维生素D受体缺失促使APCmin/+小鼠肠道肿瘤的发展.

Effects of inactivation of vitamin D receptor in intestinal tumor growth of APCmin/+ mice

Objective To explore effects and mechanism of inactivation of vitamin D receptor (VDR) in intestinal tumor growth of APCmin/+ mice. Methods To generate APCmin/+VDR -/- mice through breeding, the number and size of small intestinal and colonic tumors were assessed and compared between APCmin/+ and APCmin/+ VDR -/- mice. The intestinal tumors were diagnosed with HE stain. The expressions of BCL-2,vimentin-1,Stat-1 and MSH-2 proteins of tumors were determined by immanohistocbemistry and compared be-tween APCmin/+ and APCmin/+VDR -/- mice. Results A comparison between APCmin/+ and APCmin/+ VDR -/- mice revealed that the number of the tumors, which were larger than 3mm, was significantly increased in APCmin/+ VDR -/- mice at 4 months of age (P< 0.01). HE staining indicated fistulous adenomas from small intestine and colon of two groups, Immunostaining showed Stat - 1 level in APC-min/+ tumors were increased and MSH-2 and vimentin-1 levels in APCmin/+ VDR-/- mice were increased, compared to APCmin/+tumors. Conclusion These observations suggested that inactivation of VDR promoted the intestinal tumor growth of APCmin/+ mice.