Blimp-1, an intrinsic factor that represses HIV-1 proviral transcription in memory CD4+ T cells.

Blimp-1, an intrinsic factor that represses HIV-1 proviral transcription in memory CD4+ T cells.
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DOI:
10.4049/jimmunol.1402581
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发表时间:
2015-04-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Henderson AJ
Henderson AJ
中科院分区:
其他
文献类型:
--
作者:
Kaczmarek Michaels K;Natarajan M;Euler Z;Alter G;Viglianti G;Henderson AJ

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CD 4 + T细胞亚群差异支持HIV-1复制。例如,静止的CD 4+记忆T细胞易受HIV-1感染,但不支持稳健的HIV-1转录,并被认为是潜伏HIV-1的主要储存库。调节成熟的T细胞转录因子可能限制HIV-1转录并介导HIV-1潜伏期的建立和维持。我们报道了B淋巴细胞诱导的成熟蛋白-1(Blimp-1),一种B和T细胞分化的关键调节因子,在记忆性CD 4 + T细胞中比幼稚CD 4 + T细胞高表达,并抑制基础和Tat介导的HIV-1转录。Blimp-1结合HIV-1前病毒内的干扰素刺激反应元件(ISRE),并在T细胞活化后被置换。受感染的原代T细胞(包括CD 4+记忆T细胞)中Blimp-1的减少增加了RNA聚合酶II的持续合成能力、组蛋白乙酰化和基线HIV-1转录。因此,转录抑制因子Blimp-1是使CD 4+记忆T细胞易于潜伏HIV-1感染的内在因子。
CD4+ T cell subsets differentially support HIV-1 replication. For example, quiescent CD4+ memory T cells are susceptible to HIV-1 infection but do not support robust HIV-1 transcription and have been implicated as the primary reservoir of latent HIV-1. T cell transcription factors that regulate maturation potentially limit HIV-1 transcription and mediate the establishment and maintenance of HIV-1 latency. We report that B lymphocyte-induced maturation protein-1 (Blimp-1), a critical regulator of B and T cell differentiation, is highly expressed in memory CD4+ T cells compared to naïve CD4+ T cells and represses basal and Tat-mediated HIV-1 transcription. Blimp-1 binds an interferon-stimulated response element (ISRE) within HIV-1 provirus and it is displaced following T cell activation. Reduction of Blimp-1 in infected primary T cells including CD4+ memory T cells increases RNA polymerase II processivity, histone acetylation and baseline HIV-1 transcription. Therefore, the transcriptional repressor, Blimp-1, is an intrinsic factor that predisposes CD4+ memory T cells to latent HIV-1 infection.
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