The effects of RNase H inhibitors and nevirapine on the susceptibility of HIV-1 to AZT and 3TC.

The effects of RNase H inhibitors and nevirapine on the susceptibility of HIV-1 to AZT and 3TC.
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RNase H 抑制剂和奈韦拉平对 HIV-1 对 AZT 和 3TC 敏感性的影响。

DOI:
10.1016/j.virol.2011.08.010
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发表时间:
2011
期刊:
影响因子:
3.7
通讯作者:
Hughes,StephenH
Hughes,StephenH
中科院分区:
医学3区
文献类型:
--
作者:
Davis,CarolineA;Parniak,MichaelA;Hughes,StephenH

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最近有人提出,降低RNase H活性的HIV RT突变通过延迟RNA模板的降解来增加齐多夫定(AZT)的耐药性,从而使AZTMP从病毒DNA的3‘端有更多的时间被切除。这预示着次适浓度的RNase H抑制剂(RNHI)会降低RNAseH的活性,也会降低AZT的敏感性。相反,低于最佳浓度的非核苷类逆转录酶抑制剂(NNRTI)会降低聚合酶活性并增加AZT的敏感性。我们通过使用WT或AZT耐药RT S复制的载体,确定了几种RNHI和一种NNRTI(奈韦拉平)对AZT和拉米夫定(3TC)敏感性的影响。对不易切除的3TC的敏感性没有显著变化。奈韦拉平和大多数RNHI测试,对艾滋病毒载体对AZT和3TC的敏感性只有很小的影响。一个RNHI,F0444-0019,使AZT对任何一个载体的IC50增加了~5倍,这可能是一个令人担忧的问题。
It was recently proposed that HIV RT mutations that decrease RNase H activity increase zidovudine (AZT) resistance by delaying the degradation of the RNA template, allowing more time for AZTMP excision from the 3′ end of the viral DNA. This predicts that suboptimal concentrations of an RNase H Inhibitor (RNHI), which would decrease RNaseH activity, would decrease AZT susceptibility. Conversely, a suboptimal concentration of a nonnucleoside RT inhibitor (NNRTI) would decrease polymerase activity and increase AZT susceptibility. We determined the effect of several RNHIs and an NNRTI (nevirapine) on AZT and lamivudine (3TC) susceptibility with vectors that replicate using WT or AZT resistant RTs. Susceptibility to 3TC, which is not readily excised, did not change significantly. Nevirapine, and most RNHIs tested, had only small effects on the susceptibility of either HIV vector to AZT and 3TC. One RNHI, F0444-0019, increased the IC50for AZT for either vector by ~5-fold, which may be a concern.
接受齐多夫定或司他夫定三联疗法的未接受过抗逆转录病毒治疗的 HIV-1 患者中胸苷类似物突变。
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