确定V3环作为HIV-1 CD4中和敏感性的主要决定因素
S S Hwang1, T J Boyle, H K Lyerly
1Department of Microbiology and Immunology, Duke University Medical Center, Durham, NC 27710.
概括
主要人体免疫缺陷病毒1型 (HIV-1) 隔离物表现出对可溶性CD4 (sCD4) 中和的抗性,与实验室菌株不同. 艾滋病毒-1包膜蛋白的V3循环决定了组织热带性和sCD4耐药性.
科学领域:
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
背景情况:
- 人类免疫缺陷病毒1型 (HIV-1) 的实验室菌株,如HTLV-IIIB,通常是T细胞热带的,容易被可溶性CD4 (sCD4) 中和.
- 许多初级HIV-1分离体表现出巨细胞的热带性和对sCD4中和的抗性,这对抗病毒疗法构成了挑战.
研究的目的:
- 调查HIV-1包裹V3循环在确定组织热带性和sCD4中和敏感性的作用.
- 了解原发性HIV-1分离体中sCD4耐药性背后的机制.
主要方法:
- 对HIV-1封面V3循环序列的基因操纵.
- 从初级分离物引入V3循环序列到实验室适应的HIV-1菌株.
- 改性HIV-1株的组织热带性和sCD4中和敏感性的评估.
主要成果:
- 从初级分离物中获取的HIV-1包膜V3循环序列给实验室适应的HTLV-IIIB菌株赋予了巨细胞热带性和sCD4耐药性.
- 在V3循环中单个氨基酸的替换显著增强了sCD4的抗性,高达十倍.
- 组织热带性和sCD4中和敏感性似乎由HIV-1 V3循环中的类似机制调节.
结论:
- 艾滋病毒-1包膜蛋白的V3循环是病毒组织热带性和敏感性对可溶性CD4中和的关键决定因素.
- 了解V3循环变异对于开发有效的HIV-1疗法和预测治疗结果至关重要.
- 针对V3循环或利用其在热带作用中的作用可以为HIV-1干预提供新的策略.
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