摘要
目的 :将pcDNA3 -hCEA转染小鼠骨髓树突状细胞 (DCs) ,观察其诱导BALB/c小鼠对CT2 6(hCEA+ )的抗肿瘤免疫效应。方法 :采用rmGM -CSF和rmIL - 4体外诱导培养小鼠骨髓DCs;构建真核表达质粒pcDNA3 -hCEA ;并用lipofectamine将其转染DCs,制备DCs(pCDNA3 -hCEA)疫苗 ;同时制备CT2 6(hCEA+ ) ;采用RT -PCR检测DCs(pCDNA3 -hCEA)中CEAmRNA的表达 ,采用放射免疫法检测DCs(pCDNA3 -hCEA)培养上清中CEA的含量 ;使用DCs(pCDNA3 -hCEA)疫苗体外诱导小鼠同种异体T淋巴细胞靶向性杀伤。采用DCs(pcDNA3 -hCEA)疫苗预防免疫BALB/c小鼠 ,观察其对于荷临界致瘤量CT2 6(hCEA+ )小鼠的抗肿瘤效应。结果 :经G41 8筛选 ,DCs(pCDNA3 -hCEA)有 1 4 %的获得率 ;RT -PCR检测表明DCs(pCDNA3 -hCEA)内CEAmRNA呈阳性表达 ;放射免疫法检测表明DCs(pCDNA3 -hCEA)能微量表达人CEA ;DCs(pCDNA3 -hCEA)能够有效诱导CEA靶向免疫杀伤。DCs(pcDNA3 -hCEA)疫苗延长荷CT2 6(hCEA+ )瘤小鼠生存期 1周至 4周。结论 :编码肿瘤抗原基因的真核表达质粒转染的树突状细胞 。
AIM: To prepare the vaccine of DCs(pcDNA3-hCEA) and observ the immunity effect of the DCs(pcDNA3-hCEA) inoculating on CT26(hCEA +) loaded in BALB/c mice. METHODS: DCs were generated from bone marrow in the presence of rmGM-CSF and rmIL-4. A new recombinant plasmid, pcDNA3-hCEA, reformed with inserting a 2.4 kb human CEA cDNA into pcDNA3. DC vaccine was prepared by transfection with pcDNA3-hCEA using lipofectamine. CEA mRNA expressed in DCs(pcDNA3-hCEA) was confirmed by RT-PCR, CEA expression level was detected with RIA method, and CEA specific CTL was induced in vitro . After vaccination of DCs(pcDNA3-hCEA), the survival time of the BALB/c mice challenged with critical loading CT26(hCEA +) was observed. RESULTS: G418 test showed that about 14% DCs were transfected with pcDNA3-hCEA. And CEA mRNA and protein could be detected respectively by RT-PCR and RIA in the genetically modified DCs. Furthermore, the DCs coud be targeted by specific CTL, the survival time of the mice challenged with CT26(hCEA +) was prolonged 1-4 weeks. CONCLUSION: These results demonstrate that specific antitumor immune responses could be induced efficiently by vaccination of DCs(pcDNA3-hCEA), which is transfected eukaryotic expression vector encoding tumor antigen gene.
出处
《中国病理生理杂志》
CAS
CSCD
北大核心
2002年第11期1317-1323,共7页
Chinese Journal of Pathophysiology
基金
河南省医学科技创新人才工程项目
河南省重点科技攻关项目 (No.0 0 1 1 70 2 0 9)
