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SCI TRANS MED:病毒性HIV疫苗可持久保护免受致死病毒的伤害

2019-07-29 海北 MedSci原创

许多猿猴和猿人类免疫缺陷病毒(分别为SIV和SHIV)已被用于评估HIV-1疫苗策略的功效。其中,SIVmac239被认为是最严格的,因为与SHIV模型不同,它的全基因组在其猕猴宿主中共同进化,其3级包膜糖蛋白(Env)特别难以中和。

许多猿猴和猿人类免疫缺陷病毒(分别为SIVSHIV)已被用于评估HIV-1疫苗策略的功效。其中,SIVmac239被认为是最严格的,因为与SHIV模型不同,它的全基因组在其猕猴宿主中共同进化,其3级包膜糖蛋白(Env)特别难以中和。

在这里,研究人员探究了eCD4-Ig的能力,eCD4-Ig是一种仿效HIV-1SIV受体和辅助受体的抗体样进入抑制剂,可预防SIVmac239感染

研究人员发现,由重组腺相关病毒(AAV)载体表达的rh-eCD4-IgI39N可以使得四只恒河猴完全保护,免受高剂量SIVmac239攻击。

然而,表达rh-eCD4-IgI39N的猕猴最终死于连续升高的病毒剂量,其是感染对照动物的感染剂量的2, 8, 1632倍。

尽管接受更大的攻击剂量,这些猕猴的峰值和后峰值病毒载量显着低于对照组。从四只猕猴中的三只中分离的病毒显示出来自rh-eCD4-IgI39N的强免疫压力的证据,其中突变位于CD4结合位点,这是利用rh-eCD4-IgI39N与恒河猴CD4之间的点突变差异。

其他逃避途径与病毒的明显健康成本相关。以上数据显示了该方式可以有效保护SIVmac239对恒河猴的感染。


原始出处:

Matthew R. Gardner et al. AAV-delivered eCD4-Ig protects rhesus macaques from high-dose SIVmac239 challengesScience Translational Medicine, 2019; 11 (502): eaau5409 DOI: 10.1126/scitranslmed.aau5409


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    2019-10-07 bsmagic9140
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    2020-01-28 howi
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    2019-07-29 329523732

    不错

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