HIV‐1 replication in CD4+ T cell lines: the effects of adaptation on co‐receptor use, tropism, and accessory gene function

HIV‐1 replication in CD4+ T cell lines: the effects of adaptation on co‐receptor use, tropism, and accessory gene function
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CD4+ T 细胞系中的 HIV-1 复制:适应对共受体使用、趋向性和辅助基因功能的影响

DOI:
10.1189/jlb.68.3.331
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发表时间:
2000
影响因子:
5.5
通讯作者:
N. Dejucq
N. Dejucq
中科院分区:
医学3区
文献类型:
--
作者:
N. Dejucq

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我们研究了HIV-1嗜巨噬细胞CCR 5-使用菌株(R5)在CD 4 + T细胞系中的复制,以更好地了解疾病进展期间此类菌株的辅助受体使用的转换,并评估细胞嗜性的变化。我们发现,大多数R5菌株不能在CD 4 + T细胞系中复制,而不通过连续传代进行适应。然而,一小部分原代R5分离株能够感染两种T细胞系Molt 4和SupT 1。这种扩大的向性是由于使用了不可检测水平的CCR 5而不是CXCR 4或替代受体。相反,HIV-1 SF 162在C8166 T细胞系中复制的适应性是由于出现了可以使用CXCR 4的变异株。在两种变体中,一种是双嗜性的,一种是T嗜性的,尽管两者都可以使用CCR 5和CXCR 4。辅助基因vpu的起始密码子中的单个突变解释了第二种变体的T嗜性表型,表明非功能性vpu损害巨噬细胞嗜性。因此,在体外并且在不存在免疫应答的情况下,R5菌株天然地适应感染CXCR 4 + T细胞系。这种适应类似于体内发生的罕见的R5到X4的转换。辅助基因的突变(例如,在快速分裂的细胞系中复制不需要的VPU)也可以在体外发生,消除了在原代细胞类型如巨噬细胞中的复制。然而,这种突变通常是针对体内选择的。
We studied the replication of HIV‐1 macrophage‐tropic CCR5‐using strains (R5) in CD4+ T cell lines to better understand the switch in co‐receptor use of such strains during disease progression and to assess resulting changes in cell tropism. We found that the majority of R5 strains cannot replicate in CD4+ T cell lines without adaptation by serial passage. A small minority of primary R5 isolates, however, were able to infect two T cell lines, Molt4 and SupT1. This expanded tropism was due to the use of undetectable levels of CCR5 rather than CXCR4 or alternative receptors. In contrast, HIV‐1SF162 adaptation for replication in the C8166 T cell line was due to the emergence of variant strains that could use CXCR4. Of two variants, one was dual‐tropic and one T‐tropic, although both could use CCR5 as well as CXCR4. A single mutation in the start codon of the accessory gene vpu accounted for the T‐tropic phenotype of the second variant, indicating that a non‐functional vpu impairs macrophage tropism. Thus, in vitro and in the absence of an immune response, R5 strains naturally adapt to infect CXCR4+ T cell lines. Such adaptation resembles the rare R5 to X4 switch that occurs in vivo. Mutations in accessory genes (e.g., vpu) not required for replication in rapidly dividing cell lines may also occur in vitro, abrogating replication in primary cell types such as macrophages. Such mutations, however, are normally selected against in vivo.
DOI: 10.1073/pnas.94.5.1925
发表时间: 1997-03-04
影响因子: 11.1
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影响因子: 3.8
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