THE ROLE OF RECOMBINANT Rb GENE ADENOVIRUS VECTOR IN THE GROWTH OF LUNG ADENOCARCINOMA CELLS

Objective: To study the role of the most extensively studied tumor suppressor gene, retinoblastoma (Rb) gene, on the growth of lung adenocarcinoma cell line GLC 82 and explore a gene therapy approach for lung adenocarcinoma Methods: The recombinant Rb gene adenovirus vector was constructed, the control virus which carries LacZ gene was producted by the same method Infection effects were detected by biochemical staining of β gal and immunohistochemical analysis of Rb protein The Rb cDNA of infected cells were determined by PCR The cell growth rate and cell cycle were observed by cell counting and flow cytometry Results: The constructed recombinant adenovirus vector could infect effectively the cells with high level expression of Rb cDNA and Rb protein The transfection of wild type Rb gene could suppress GLC 82 cell proliferation and decrease the cellular DNA synthesis Conclusions: These results showed the possibility of using recombinant Rb gene adenovirus vector in the gene therapy of cancer to inhibit the growth of cancer

Inhibition of vascular smooth muscle cell proliferation by in troduction of retinoblastoma gene via a recombinant adenovirus vector

This study was supported in part by grant from National Natural Science Foundation of China (No. 39570775). Objective To investigate the vascular smooth muscle cell (SMC) growth suppression by recombinant adenovirus vector expressing a retinoblastoma (Rb) protein and to explore a gene therapy approach for vascular proliferative disorders including atherosclerosis and artery restenosis. Methods A replication deficient adenovirus vector encoding a wild type Rb and AdCMVRb, was constructed and transfected into cultured rabbit aortic SMC. The efficiency of gene transfection and expression was detected by immunochemical staining and polymerase chain reaction. The role of Rb in regulating vascular SMC proliferation was observed by cell counting, thymidine incorporation, and flow cytometry. Results Wild type Rb gene transfected effectively into the cultured SMC with AdCMVRb can suppress growth factor stimulated cell proliferation through regulation of DNA synthesis and cell cycle progression. Conclusion The results demonstrate the potential of adenovirus mediated Rb gene therapy for atherosclerosis and artery restenosis after balloon angioplasty.

ADENOVIRUS-MEDIATED WILD-TYPE P53 EXPRESSION SUPPRESSES GROWTH OF LUNG ADENOCARCINOMA CELLS

Objective: To study the growth suppression of lung adenocarcinoma cell by the introduction of wild type P53 gene and explore a gene therapy approach for lung adenocarcinoma. Methods: A replication deficient adeno virus vector encoding a wild type P53 was constructed and transfected into the cultured human lung adeno carcinoma cell line GLC 82. The efficiency of gene transfection and expression was detected by immuno chemical staining and polymerase chain reaction. The cell growth rate and cell cycle were analysed by cell counting and flow cytometry. Results: Wild type P53 gene could be quickly and effectively transfected into the cells by adenovirus vector. Wild type P53 expression could inhibit GLC 82 cell proliferation and induce apoptosis. Conclusion: The results indicated that recombinant adenovirus expressing wild type P53 might be useful vector for gene therapy of human lung adenocarcinoma.

腺病毒介导的野生型p53基因对肺腺癌细胞株生长的抑制作用

为研究野生型p53基因对肺腺癌细胞株GLC-82细胞生长的作用,确立腺病毒介导的野生型p53基因在肿瘤治疗中的意义,应用分子克隆技术首先构建了野生型p53复制缺陷型腺病毒重组体,应用生化染色方法确定了重组体的转染效率,以免疫组化法及PCR技术分别确定了腺病毒载体介导的p53基因转染GLC-82细胞后p53蛋白和p53 cDNA的表达情况;最后应用细胞生物学方法检测了p53对GLC-82细胞扩增及细胞周期的影响.结果表明所构建的重组体可以高效、快速转染GLC82细胞,抑制GLC-82细胞扩增,使细胞合成期和分裂后期的量减少。

Rb基因导入对膀胱癌细胞生长的抑制作用

为探讨腺病毒载体介导的外源性Rb基因导入对膀胱癌细胞生长的抑制作用,为膀胱癌的基因治疗提供实验依据,构建了Rb基因的复制缺陷型重组腺病毒载体.体外转染人膀胱癌细胞株EJ.应用免疫组化法、免疫印迹及聚合酶链反应技术检测外源性Rb基因腺病毒载体的转染效率及Rb基因表达效果;用流式细胞仪分析细胞周期;以细胞计数及同位素掺入技术观察外源性Rb基因对EJ细胞生长的抑制效果.结果显示腺病毒载体可有效地将外源基因导入EJ细胞.Rb基因重组腺病毒载体转染细胞后,胞内DNA合成减少,细胞生长受到抑制.流式细胞仪分析显示68%的EJ细胞生长停滞在GO/GI期.结果提示。

介导p53基因转移的重组体腺病毒对人肺癌细胞的抑制作用

p53基因突变是肿瘤发生中的多发事件 ,导入野生型p53基因能抑制肿瘤细胞的生长。通过腺病毒载体介导 ,将野生型p53基因转导到人肺腺癌细胞系 (GLC - 82 )中 ,证实对肺腺癌细胞生长具有明显的抑制作用 ,抑制率达 6 1%。对GLC - 82细胞系裸鼠皮下移植瘤进行治疗实验结果表明 ,p53能抑制肿瘤细胞体内的生长。流式细胞计数及DNA片段化分析显示 ,p53基因的转导能诱导肺腺癌细胞发生凋亡。研究结果提示 ,腺病毒能介导p53基因对肿瘤进行治疗 ,并可作为肿瘤外科手术、化疗、放疗外的又一治疗方法。

外源性Rb基因转染对头颈肿瘤的抑制作用

目的 探讨外源性 Rb基因对头颈肿瘤的抑制作用。方法 运用携带 Rb基因的复制缺陷型腺病毒转染口腔鳞癌细胞株 0 12 ,观察其体内和体外的抑癌效果。结果 腺病毒表达载体可有效地将外源性 Rb基因转染 0 12细胞并使其表达。体内、体外抑瘤实验表明 :导入 Ad- Rb基因的肿瘤细胞 ,其细胞生长曲线明显受抑制 ,Ad- Rb基因治疗组裸鼠肿瘤生长最为缓慢 ,与 DL312和 PBS对照组比较有显著性差异 (P<0 .0 5 )。结论 腺病毒介导的外源性 Rb基因可有效地转染入口腔鳞癌细胞株 ,并抑制其生长。