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中国生物工程杂志

CHINA BIOTECHNOLOGY
中国生物工程杂志  2012, Vol. 32 Issue (07): 20-25    
研究报告     
前肽缺失体vWF改善FVIII基因断裂转移 细胞的重链和活性分泌
朱甫祥, 刘泽隆, 缪静, 屈慧鸽, 迟晓艳
鲁东大学生命科学学院 烟台 264025
Propeptide-deleted von Willebrand Factor Improves Heavy Chain Secretion and Bioactivity by Split FVIII Gene Co-transfected Cells
ZHU Fu-xiang, LIU Ze-long, MIAO Jing, QU Hui-ge, CHI Xiao-yan
Life Science College of Ludong University, Yantai 264025, China
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摘要: 通过转von Willebrand因子(vWF)的前肽缺失突变体(vWF-ΔPro)基因,探讨了vWF-ΔPro对双载体转凝血VIII因子(FVIII)基因的影响。将vWF-ΔPro基因和B-区缺失型FVIII(BDD-FVIII)的重、轻链基因共转染HEK293细胞48 h后,ELISA检测重链的分泌量为(142±29)ng/ml,明显高于未转vWF-ΔPro基因细胞(87±15)ng/ml;未转vWF-ΔPro基因时单独转重链基因的重链分泌水平很低,vWF-ΔPro存在时重链分泌量明显提高,但不如共转基因时的重链分泌,提示轻链可反式促进重链分泌;单独转轻链或与重链共转基因时轻链分泌水平均较高,且不受vWF-ΔPro影响;Coatest法检测分泌的凝血活性显示,转vWF-ΔPro基因可使细胞分泌的凝血活性明显高于未转vWF-ΔPro基因细胞(0.80±0.15 IU/ml vs 0.41±0.08 IU/ml)。另外,转vWF-ΔPro基因条件下,合并培养转重链和转轻链基因细胞的培养上清中,也检测到FVIII凝血活性(0.23±0.09 IU/ml),提示vWF-ΔPro有助于分泌的重、轻链形成功能性异源二聚体。表明转vWF-ΔPro基因可促进双链转FVIII基因,为进一步动物体内实验奠定了基础。
关键词: 前肽缺失型vonWillebrand因子凝血VIII因子双载体转基因    
Abstract: Dual-vector based FVIII gene split delivery has been developped as an altenative strategy to overcome the packaging limitation of adeno-associated virus (AAV) vectors in hemophilia A gene therapy but the efficacy is undesired for the inefficient secretion of heavy chain. A propeptide-deleted mutant of von Willebrand factor(vWF-ΔPro), which functions as a carrier of FVIII was tested for its effect on dual-vector FVIII gene delivery. 48 hours post-transfection of HEK293 cell with vWF-ΔPro, heavy and light chain genes of a B-domain deleted FVIII (BDD-FVIII), a chain-specific ELISA showed high levels of heavy chain secretion of 142?29ng/ml in the culture supernatant, greater than that of cell without vWF-ΔPro co-transfection(87?15ng/ml). The heavy chain transfected cells showed a very low levels of heavy chain secretion in absence of vWF-ΔPro although improved in presence of vWF-ΔPro, but lower than that of heavy and light chain co-transfected cells indicating a pro-secretion effect of light chain on heavy chain in trans. The light chain showed higher efficient secretion in light chain gene transfection alone or co-transfection with heavy chain, which was not affected by vWF-ΔPro. The Coatest assay showed an obviously higher bioactivity (0.80?0.15IU/ml) in supernatant of vWF-ΔPro, heavy and light chain genes co-transfected cell, compared to vWF-ΔPro-free co-transfection cell (0.41?0.08IU/ml). The supernatant from combined cells separately transfected with heavy and light chain displayed FVIII bioactivity of 0.23?0.09IU/ml in presence of vWF-ΔPro, suggesting a function of vWF-ΔPro in assembly of secreted heavy and light chain into a functional hetero-dimer. The data demonstrated that vWF-ΔPro transfection could improve dual-vector mediated FVIII gene delivery forming a basis for ongoing in vivo study.
Key words: Propeptide-deleted von    Willebrand factor (vWF-ΔPro)    Factor VIII(FVIII)    Dual-vector gene delivery
收稿日期: 2011-12-05 出版日期: 2012-07-25
ZTFLH:  Q7  
基金资助: 山东省自然科学基金(ZR2010CM061);教育部留学回国人员科研启动基金(20071108)资助项目
通讯作者: 朱甫祥     E-mail: fuxiangmail@163.com
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引用本文:

朱甫祥, 刘泽隆, 缪静, 屈慧鸽, 迟晓艳. 前肽缺失体vWF改善FVIII基因断裂转移 细胞的重链和活性分泌[J]. 中国生物工程杂志, 2012, 32(07): 20-25.

ZHU Fu-xiang, LIU Ze-long, MIAO Jing, QU Hui-ge, CHI Xiao-yan. Propeptide-deleted von Willebrand Factor Improves Heavy Chain Secretion and Bioactivity by Split FVIII Gene Co-transfected Cells. China Biotechnology, 2012, 32(07): 20-25.

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https://manu60.magtech.com.cn/biotech/CN/        https://manu60.magtech.com.cn/biotech/CN/Y2012/V32/I07/20

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