人精子细胞膜结合型透明质酸酶促进人乳腺癌细胞增殖的实验观察

目的　探讨人精子细胞膜结合型透明质酸酶 (PH2 0 )促进乳腺癌细胞增殖的机制。方法　将人PH2 0cDNA转染到人乳腺癌细胞株MDA2 31中 (MDA2 31 PH2 0 ) ,对照组用pcDNA3空载体替代PH2 0重组体。将MDA2 31 PH2 0和MDA2 31 pcDNA3分别以同样数量种植到鸡胚绒毛尿囊膜 (CAM)上 ,种植后第 4天切取肿瘤称重 ,并用免疫组织化学方法研究肿瘤组织中血管形成的变化。另外 ,用Trans well细胞培养法研究MDA2 31 PH2 0和MDA2 31 pcDNA3细胞对牛主动脉内皮细胞 (ABAE)生长的影响 ;用Western印迹法观察这两组细胞的成纤维细胞生长因子 2 (FGF 2 )表达水平 ,并用酶联免疫吸附试验测定两组细胞的FGF 2和透明质酸 (HA)分泌量。结果　MDA2 31 PH2 0组平均肿瘤重量为4 4 7mg± 10 2mg ,MDA2 31 pcDNA3组为 2 1 3mg± 2 8mg,两组比较差异有显著意义 (t=2 4 18,P =0 0 38)。MDA2 31 PH2 0肿瘤组织中新生血管明显增多。MDA2 31 PH2 0细胞FGF 2蛋白质表达水平增高 ,同时细胞FGF含量 (8 10pg/ml± 1 5 6pg/ml)和HA含量 (12 2 0ng/ml± 2 5 4ng/ml)也均高于对照组(分别为 3 94pg/ml± 0 82pg/ml和 4 6 2ng/ml± 96ng/ml,均P <0 0 1)。结论　PH2 0可能通过促进癌细胞释放FGF 2和分解HA成小片段 ,刺激新生血管生长并促进肿瘤

Promotion of growth of human breast cancer cells MDA231 by human sperm membrane-bound hyaluronidase: an experimental study

OBJECTIVE: To study the mechanism how human sperm membrane-bound hyaluronidase (PH20) promotes the gowth of human breast cancer. METHODS: Full-length cDNA of human PH20 was transfected into human breast cancer cell line MDA231. The transfectant MDA231-PH20 was then implanted into the chorio-allantoic membrane (CAM) of chicken embryo to form a tumor. Four days after implantation, the tumors were resected to be weighed. The angiogenesis in tumor tissue was examined by immunohistochemistry. Trans-well cell culture was used to study the effect of MDA231-PH20 on the growth of adult bovine aortic endothelial cells (ABAE). The expression of fibroblast growth factor-2 (FGF-2) in the tumor cells was investigated by Western blotting. ELISA was used to examine the secretion of FGF-2 and hyaluronic acid. The same amount of empty vector pcDNA3, instead of PH20, was transfected into human breast cancer cell line MDA231 as control group. RESULTS: The average weight of tumor four days after implantation was 44.7 mg +/- 10.2 mg in the MDA231-PH20 group, and was 21.3 mg +/- 2.8 mg in the control group (t = 2.418, P = 0.038). Neogenetic vessels increased remarkably in MDA231-PH20 tumor tissues. The expression of FGF-2 protein was much higher in MDA231-PH20 cells. The FGF content and HA secretion were higher in the MDA231-PH20 group than in the control group (8.10 pg/ml +/- 1.56 pg/ml vs. 3.94 pg/ml +/- 0.82 pg/ml, and 1 220 ng/ml +/- 254 ng/ml vs. 462 ng/ml +/- 96 ng/ml, all P < 0.01). The growth of ABAE cells was significantly accelerated after co-culture with MDA231-PH20 transfectant. CONCLUSION: PH20 may promote the growth of human breast cancer by accelerating the release of FGF-2 from tumor cells, decomposing HA into small fragments, and promoting angiogenesis.