人类免疫缺陷病毒Ⅰ型载体研究进展

Advance in Reseach on Human Immunodeficiency Virus Type Ⅰ Vector

人类免疫缺陷病毒Ⅰ型 (humanimmunodeficiencyvirustypeⅠ ,HIV Ⅰ )为慢病毒家族成员之一 ,除 gag ,pol与env等结构基因外 ,其结构中还含有编码 2个调节蛋白及 4个附属蛋白的基因。目前已构建了多种类型的复制缺陷性HIV Ⅰ载体 ,产生的病毒滴度最高可达 10 7TU /ml;对包装细胞系的研究发现 ,将 4个附属基因全部去除对载体的转导能力并无显著影响。基因组分离式包装系统降低了产生具有复制能力的病毒的可能性。HIV Ⅰ载体具有两大特点 :可有效转导人CD34+造血干 /祖细胞、重复注射不引起排斥反应。改建后的HIV Ⅰ载体具有广泛的宿主范围。

Human immunodeficiency virus type-Ⅰ (HIV-Ⅰ), one kind of lentiviruses, was characterized by a complex genome that encodes two regulatory proteins and four accessory proteins in addition to the common gag, pol and env gene products. So far, a few of different types of replication-defective vectors were constructed, the highest viral titer from one of which was above 10 7TU/ml. Several studies on packaging cell line found that eliminating the four accessory genes would have few effect on transduction ability of vector and split-genome package system could reduce the possibility of producing replication-competent virus. There are two kinds of characters on HIV-Ⅰ vectors. Firstly, it was highly efficient in transducing CD34 + human hematopoietic stem/progenitor cells; secondly, repeated injections of the HIV-Ⅰ vector into animal did not elicit the rejection response. HIV-Ⅰ vector had an extensive host range.