人癌胚抗原与新城疫病毒HN基因共表达载体的构建及表达

注射肿瘤疫苗 ,诱发机体产生特异性抗肿瘤免疫 ,是肿瘤生物治疗及手术后预防肿瘤复发、转移的重要手段之一。肿瘤核酸疫苗较重组蛋白或多肽疫苗来说 ,具有无可比拟的优点 ,它可同时诱导体液免疫和细胞免疫 ,后者在肿瘤免疫中起关键作用。传统的肿瘤疫苗是经各种方法灭活后的自体瘤苗 ,它虽可以诱导细胞免疫 ,但仍存在着灭活不彻底 ,导致人为瘤细胞种植的潜在危险 ,况且从操作性方面也较为繁琐、复杂。肿瘤抗原往往抗原性较弱 ,尤其是相关抗原 ,在某些正常组织中也有微量的表达 ,这容易使机体免疫系统对它产生免疫耐受 ,因此在激发肿瘤特异性…

Construction and Expression of Coexpression Plasmid of Carcinoembryonic Antigen and Newcastle Disease virus HN Gene

The eukaryotic expression plasmid (pcDNA3-CEA)containing with the gene coding for the Carcinoembryonic antigen(CEA) had been gotten with RT-PCR and gene recombination techniques. Using enzymolysis, ligation and other techniques, an eukaryotic coexpression plasmid(pcDNA3-CEA/HN)containing two expression unites of CEA and Newcastle disease virus HN gene that may have the function of immunoenhancement had been constructed. The plasmid will lay a foundation for further researching CEA nucleiotide vaccine, adjuvant and their effect of special antitumor immune.