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
复制标题
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
复制
发表时间:
2000
影响因子:
5.5
通讯作者:
N. Dejucq
中科院分区:
文献类型:
--
作者:
N. Dejucq
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.
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DOI:
10.1073/pnas.94.5.1925
发表时间:
1997-03-04
影响因子:
11.1
作者:
Bleul, CC;Wu, LJ;Mackay, CR
通讯作者:
Mackay, CR
DOI:
10.1073/pnas.95.13.7682
发表时间:
1998
影响因子:
11.1
作者:
Ross,TM;Cullen,BR
通讯作者:
Cullen,BR
影响因子:
3.8
作者:
E. Berger
通讯作者:
E. Berger
影响因子:
56.9
作者:
ZHU, TF;MO, HM;HO, DD
通讯作者:
HO, DD
影响因子:
3.7
作者:
Trujillo,JR;Wang,WK;Lee,TH;Essex,M
通讯作者:
Essex,M