的微改性HIV-1感染:当前模型的发展,实用性和局限性
Manish Sharma1, Mukta Nag1, Gregory Q Del Prete1
1AIDS and Cancer Virus Program, Frederick National Laboratory for Cancer Research, Frederick, MD 21702, USA.
Viruses
|October 26, 2024
概括
在中开发最小修饰的HIV-1 (mmHIV-1) 为HIV-1研究提供了比SIV更好的模型. 一种新的mmHIV-1克隆,stHIV-A19,在猪尾中显示出有前途的结果,导致与CD8α+细胞枯竭的艾滋病类似的结果.
科学领域:
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
- 灵长类动物模型
背景情况:
- 猿类免疫缺陷病毒 (SIV) 模型对于研究人类免疫缺陷病毒 (HIV-1) 是有价值的,但由于显著的生物学差异而存在局限性.
- 现有的SIV模型并不适合所有HIV-1研究,包括基本生物学研究和干预措施的临床前测试.
研究的目的:
- 开发一种微小修饰的HIV-1 (mmHIV-1),可以在中确立致病性感染,密切模仿人类的HIV-1感染.
- 为了设计HIV-1以克服特定物种的限制因素,结合CCR5-热带包裹,并纠正基因表达缺陷以有效感染.
主要方法:
- 开发mmHIV-1变种,重点是克服特异性的细胞限制 (例如TRIM5α) 并通过CD4受体优化病毒进入.
- 一个CCR5-热带mmHIV-1克隆 (stHIV-A19) 的衍生,具有94%的HIV-1序列,在猪尾 (PTM) 中进行了测试.
- 在PTM中评估stHIV-A19复制和致病的评估,在感染期间有或没有CD8α+细胞枯竭.
主要成果:
- 在PTM中,stHIV-A19克隆复制到高标位.
- 在CD8α+细胞枯竭的PTM中,stHIV-A19诱导的慢性病毒病,渐进的CD4+T细胞损失和艾滋病定义的临床终点.
- 在非枯竭的PTM中,目前的mmHIV-1模型中没有显示出高慢性病毒症或类似艾滋病的病原体.
结论:
- 最少修改的HIV-1 (mmHIV-1) 模型,特别是猪尾,代表了对HIV-1研究SIV模型的重大进步.
- stHIV-A19克隆显示出研究HIV-1病原和评估干预措施的潜力,特别是当与免疫调节 (如CD8α+细胞枯竭) 相结合时.
- 需要进一步改进mmHIV-1模型,以在非贫乏的中实现一致的慢性病毒病和类似艾滋病的疾病,从而提高它们对临床前研究的有用性.
相关概念视频
Retrovirus Life Cycles
Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the retrovirus to...
Viral Mutations
A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material for adaptive...
Inhibitors of Virion Maturation and Assembly
As part of their replication cycle, certain viruses synthesize long precursor proteins called polyproteins within infected host cells. In human immunodeficiency virus (HIV), two major polyproteins are produced: Gag and Gag-Pol. The Gag polyprotein supplies the structural components of the virus, while Gag-Pol includes essential viral enzymes such as reverse transcriptase, integrase, and protease. After synthesis, these polyproteins move to the host cell membrane, where they assemble into an...


