反义人骨形态发生蛋白2基因逆转录病毒表达载体的构建及其对骨肉瘤细胞生物学行为的影响

Construction of human antisense BMP-2 retrovirus expression vectors and its biological effects on human osteosarcoma cells

目的 从分子水平探讨骨形态发生蛋白 2(BMP-2)基因对骨肉瘤生物学行为的影响，并为骨肉瘤的基因治疗提供理论依据。方法 将人 BMP-2基因约 1.0 kb的 cDNA片段反向插入逆转录病毒表达载体 PDOR,构建人 BMP-2基因的反义逆转录表达载体，然后用脂质体将重组的 PDOR-BMP-2质粒转染至人的骨肉瘤细胞 OS-9901，经 G 418筛选并获得阳性克隆。用免疫组织化学卵白素-生物素-过氧化酶 (ABC)方法检测肿瘤细胞中 BMP和增殖细胞核抗原 (PCNA)的表达。应用流式细胞仪分析肿瘤细胞增殖周期并对其进行电镜观察。结果 转染后， OS-9901肿瘤细胞的内源性 BMP表达明显下降 (t=24.01。

Objective To probe into the mechanisms of bone morphogenetic protein-2 (BMP-2) in osteosarcoma and to provide basis for gene therapy. Methods A 1.0 kb cDNA fragment of human BMP-2 gene was inserted reversely into PDOR and Human antisense BMP-2 retrovirus expression vector was constructed. The recombinant retroviral vector was transfected into human osteosarcoma cells OS-9901 with liposome AMINE that expressed abundant BMP. Positive cell clones were selected with G 418. The expression of BMP and proliferating cell nuclear antigen (PCNA) was determined by immunohistochemical ABC methods. The osteosarcoma cell cycle was analysed by flowcytometry, and the changes were observed by electronmicroscope. Results The expression of cellular BMP and PCNA in the transfected osteosarcoma cells decreased obviously (t=24.01， 26.09, respectively, P