Innate Immunity in HIV Infection: Enhanced Susceptibility to CD95-Mediated Natural Killer Cell Death and Turnover Induced by HIV Viremia

Innate Immunity in HIV Infection: Enhanced Susceptibility to CD95-Mediated Natural Killer Cell Death and Turnover Induced by HIV Viremia
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HIV 感染中的先天免疫:对 CD95 介导的自然杀伤细胞死亡和 HIV 病毒血症诱导的更新的易感性增强

DOI:
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发表时间:
2007
期刊:
Journal of Acquired Immune Deficiency Syndromes
影响因子:
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通讯作者:
A. Fauci
A. Fauci
中科院分区:
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文献类型:
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作者:
S. Kottilil;Julia O. Jackson;K. N. Reitano;M. A. O'Shea;G. Roby;Margaret Lloyd;Jun Yang;C. Hallahan;C. Rehm;J. Arthos;R. Lempicki;A. Fauci

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在本研究中,我们进行了DNA微阵列分析和表型和功能分析,努力阐明正在进行的HIV复制影响自然杀伤(NK)细胞的生理功能的机制。功能检测证实,HIV感染病毒血症个体的NK细胞发生Fas介导的凋亡的倾向增加,但不发生CD 16或NKG 2D介导的凋亡。HIV感染病毒血症者血清sFasL水平和NK细胞Ki 67表达水平明显高于HIV感染病毒血症者和HIV血清阴性者。我们的数据表明,正在进行的HIV复制的结果在深刻的NK细胞异常,这可能是由于病毒诱导的免疫激活的影响。值得注意的是对由CD 95-sFasL相互作用介导的细胞死亡的易感性增加。此外,这些NK细胞,特别是CD 56 dim CD 16 bright亚群,在体内经历增强的细胞周转,如细胞内Ki 67表达所证明的。
In the present study, we performed DNA microarray analyses and phenotypic and functional analyses in an effort to elucidate the mechanisms by which ongoing HIV replication affects the physiologic function of natural killer (NK) cells. Functional assays confirmed an increased propensity of NK cells from HIV-infected viremic individuals to undergo Fas-mediated apoptosis but not CD16- or NKG2D-mediated apoptosis. Serum levels of sFasL and expression of Ki67 on NK cells were markedly elevated in HIV-infected viremic individuals when compared with those of HIV-infected aviremic and HIV-seronegative individuals. Our data demonstrate that ongoing HIV replication results in profound NK-cell abnormalities that are likely to be attributable to the effects of virus-induced immune activation. Of note is an increased susceptibility to cell death mediated by CD95-sFasL interactions. In addition, these NK cells, particularly the CD56dim CD16bright subset, undergo enhanced cell turnover in vivo, as demonstrated by intracellular Ki67 expression.
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