纳米氧化铁双歧杆菌脂磷壁酸对人胃癌荷瘤鼠体内细胞因子水平的影响

目的 探讨纳米氧化铁(Fe3 O4)双歧杆菌脂磷壁酸(Bigidobacterium lipoteichoic acid,BLTA)对人胃癌荷瘤鼠体内细胞因子水平的影响,研究以纳米Fe3 O4为载体的BLTA(Fe3 O4-BLTA)对BGC-823胃癌移植瘤的抑制机制. 方法 用人低分化BGC-823胃癌细胞株移植到40只雄性BALB/c裸鼠建立胃癌荷瘤鼠模型.将随机分组的荷瘤鼠,进行不同浓度的纳米Fe3 O4-BLTA复合物灌胃12 d后处死.取移植瘤观察其肿瘤抑制率,应用免疫组化技术,检测瘤体内CD31微血管密度值(microvessel density,MVD)及血管内皮生长因子(VEGF)的阳性率.提取腹腔巨噬细胞,用ELISA法检测细胞因子含量. 结果 纳米Fe3O4-BLTA低剂量组(10μ/d)对肿瘤的抑制率达到49%;纳米Fe3 O4-BLTA低剂量组的CD31-MVD(57.000±6.790)与VEGF的表达(O.0224士0.0763)均比其他剂量组低(P

Effect of nano-sized-Fe3O4-lipoteichoic acid from Bifidobacterium on cytokine expression in human gastric cancer in nude mice

Objective To investigate the effect of lipoteichoic acid from Bifidobacterium loaded with magnetic particle nano-sized-Fe3O4(nano-sized-Fe3O4-BLTA)on several cytokines in vivo expression in beterologous graft model for human gastric cancer in nude mice.and to analyze the inhibition mechanism of nano-sized-Fe3 O4-BLTA on BGC-823 human gastric carcinoma transplanted tumor.Methods Forty male nude mice(BALB/e.nu/nu)were used for in vivo transplant tumor model.the experimental animals were randomly divided into five groups to administrated by several dosages of Hano-sized-Fe3 O4-BLTA,and were executed after 12 d.The tumors were collected and photographed.and the tumor tissues were used for differ-ent assays for measuring tumor inhibition.The peritoneal fluid was extracted to isolate the macrophages for cytokines assays.Using irmnunohistochemical staining for vascular endothelial growth factor(VEGF)and CD3 l in tumor to investigate the tumor inhibition rate.Double antibody sandwich ELISA was used to detect the level of cytokine change.Results The mice treated with low dosage(10 μg/d)of nano-sized-Fe3O4-BLTA.the growth inhibifion rate of tumor was 49%,and the levels of VEGF(0.0224±0.0763)and CD31 (57.000 4±6.790)were lower than other treated groups(P<0.01).The high dosage(100μg/d)and me-dium dosage(50μg/d)of nano-sized-Fe3 O4-BLTA groups were significant difference(P<0.01)on the content of cytokines excreted by macrophages.The level of TNF-α(39.4040 ±-1.5590)induced by the low dosage group was higher relatively(P<0.01).Conclusion Nano-sized-Fe3O4-BLTA exerts an inhibiting effect on the growth of human gastric cancer in nude mice.Using nano-sited-Fe3 O4-BLTA,LTA can get more permeability and improve the therapy effect.which will be a new drug on the stomach cancer targeted therapy.