A novel HIV-1 restriction factor that is biologically distinct from APOBEC3 cytidine deaminases in a human T cell line CEM.NKR.

A novel HIV-1 restriction factor that is biologically distinct from APOBEC3 cytidine deaminases in a human T cell line CEM.NKR.
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DOI:
10.1186/1742-4690-6-31
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发表时间:
2009-04-03
期刊:
影响因子:
3.3
通讯作者:
Zheng YH
Zheng YH
中科院分区:
医学2区
文献类型:
--
作者:
Zhou T;Han Y;Dang Y;Wang X;Zheng YH

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新型逆转录病毒限制因子的分离将为抗艾滋病毒/艾滋病治疗开辟新途径。尽管 HIV-1 复制受到 APOBEC3G/APOBEC3F、TRIM5α 和 CD317 的限制,但在自然条件下没有一种病毒可以防御 HIV-1 感染。此前,我们证明了来自人类 T 细胞系 CEM.NKR 的宿主因子可以有效限制野生型 HIV-1 的复制。有趣的是,这种限制类似于 APOBEC3G/APOBEC3F 模式,因为病毒复制从进入后步骤的第二轮复制周期开始受到抑制。在这里,我们进一步表征了该因子,发现它与已知的抗 HIV APOBEC3 蛋白不同。尽管 CEM.NKR 细胞同时表达 APOBEC3G 和 APOBEC3F,但它们的水平比 H9 细胞中的水平至少低 10 或 4 倍,而且重要的是,Vif 有效中和了它们的活性。从 CEM.NKR 细胞中分离出的 8 个亚克隆中,1 个相对允许 HIV-1 复制,4 个为半允许复制,3 个完全不允许 HIV-1 复制。当测定APOBEC3表达水平时,所有这些克隆都保留相似的低水平的APOBEC3DE、APOBEC3F、APOBEC3G和APOBEC3H表达,并且没有检测到APOBEC3B表达。由于 SIVmac 的 vif 可以有效中和 APOBEC3B 和 APOBEC3H,因此创建了表达该 SIV 基因的重组 HIV-1。然而,这些病毒仍然无法在CEM.NKR细胞中复制。我们还证实 CEM.NKR 中的 HIV-1 限制并不是由于钙联蛋白表达的丧失。总而言之,这些结果不仅证明所有上述抗 HIV APOBEC3 蛋白不会导致这种 HIV-1 限制,而且还揭示了 CEM.NKR 细胞中一种新型且有效的 HIV-1 抑制剂。
Isolation of novel retroviral restriction factors will open new avenues for anti-HIV/AIDS treatment. Although HIV-1 replication is restricted by APOBEC3G/APOBEC3F, TRIM5α, and CD317, none defend HIV-1 infection under natural conditions. Previously, we demonstrated a host factor from the human T cell line CEM.NKR that potently restricted wild-type HIV-1 replication. Interestingly, this restriction resembled the APOBEC3G/APOBEC3F pattern in that viral replication was inhibited from the second round of replication cycle at a post-entry step. Here, we further characterized this factor and found it distinguishable from the known anti-HIV APOBEC3 proteins. Although CEM.NKR cells expressed both APOBEC3G and APOBEC3F, their levels were at least 10 or 4-fold lower than those in H9 cells, and importantly, Vif effectively neutralized their activity. Among eight subclones isolated from CEM.NKR cells, one was relatively permissive, four were semi-permissive, and three were completely non-permissive for HIV-1 replication. When the levels of APOBEC3 expression were determined, all these clones retained similar low levels of APOBEC3DE, APOBEC3F, APOBEC3G and APOBEC3H expression, and no APOBEC3B expression was detected. Since the vif from SIVmac can effectively neutralize APOBEC3B and APOBEC3H, recombinant HIV-1 expressing this SIV gene were created. However, these viruses still failed to replicate in CEM.NKR cells. We also confirmed that HIV-1 restriction in CEM.NKR was not due to a loss of calnexin expression. Taken together, these results not only demonstrate that all these aforementioned anti-HIV APOBEC3 proteins do not contribute to this HIV-1 restriction, but also shed light on a novel and potent HIV-1 inhibitor in CEM.NKR cells.
DOI: 10.1128/jvi.77.21.11398-11407.2003
发表时间: 2003-11-01
影响因子: 5.4
作者:
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通讯作者: Strebel, M
DOI: 10.1074/jbc.m707586200
发表时间: 2008-04-25
影响因子: 4.8
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DOI: 10.1038/nature00939
发表时间: 2002-08-08
期刊: NATURE
影响因子: 64.8
作者:
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通讯作者: Malim, MH
DOI: 10.1371/journal.ppat.1000095
发表时间: 2008-07-01
期刊: PLOS PATHOGENS
影响因子: 6.7
作者:
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DOI: 10.1186/1742-4690-1-27
发表时间: 2004-09-17
期刊: Retrovirology
影响因子: 3.3
作者:
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通讯作者: Strebel, Klaus