Host factor transcriptional regulation contributes to preferential expression of HIV type 1 in IL-4-producing CD4 T cells.

Host factor transcriptional regulation contributes to preferential expression of HIV type 1 in IL-4-producing CD4 T cells.
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DOI:
10.4049/jimmunol.1103129
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发表时间:
2012-09-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Cron RQ
Cron RQ
中科院分区:
其他
文献类型:
--
作者:
Zhang M;Clausell A;Robinson T;Yin J;Chen E;Johnson L;Weiss G;Sabbaj S;Lowe RM;Wagner FH;Goepfert PA;Kutsch O;Cron RQ

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HIV-1优先在产生IL-4的CD 4 T细胞中复制,原因尚不清楚。我们发现,HIV-1表达的增加与病毒对趋化因子受体的嗜性无关,但在产生IL-4的CD 4 T细胞中,HIV-1长末端重复序列(LTR)的转录增加。在来自HIV-1感染个体的产生IL-4的CD 4 T细胞中也证实了HIV-1信息的表达增加。在探索转录机制时,我们在HIV-1 LTR近端的NFκB/NFAT双结合位点的上游发现了一个新的c-maf(IL-4表达所必需的)转录因子结合位点。我们证明c-maf在体内结合该位点,并协同增强HIV-1转录与NFAT 2和NFκB p65,但不NFAT 1或NFκB p50。相反,c-maf的siRNA抑制降低了产生IL-4的T细胞中的HIV-1转录。因此,c-maf通过结合近端HIV-1 LTR并与NFAT 2和NFκB p65特异性地协同增强HIV-1转录,从而增加产生IL-4的CD 4 T细胞中的HIV-1表达。这对HIV-1感染期间选择性靶向转录因子具有重要意义,因为在HIV-1进展/AIDS过程中,产生IL-4的T细胞经常占主导地位并实质上促成疾病病理。
HIV-1 replicates preferentially in IL-4 producing CD4 T cells for unclear reasons. We show increased HIV-1 expression is irrespective of viral tropism for chemokine receptors as previously suggested, but rather transcription of the HIV-1 long terminal repeat (LTR) is increased in IL-4 producing CD4 T cells. Increased expression of HIV-1 message is also confirmed in IL-4 producing CD4 T cells from HIV-1 infected individuals ex vivo. In exploring a transcriptional mechanism, we identify a novel c-maf (required for IL-4 expression) transcription factor binding site just upstream of the dual NFκB/NFAT binding sites in the proximal HIV-1 LTR. We demonstrate c-maf binds this site in vivo and synergistically augments HIV-1 transcription in cooperation with NFAT2 and NFκB p65, but not NFAT1 nor NFκB p50. Conversely, siRNA inhibition of c-maf reduces HIV-1 transcription in IL-4 producing T cells. Thus, c-maf increases HIV-1 expression in IL-4 producing CD4 T cells by binding the proximal HIV-1 LTR and augmenting HIV-1 transcription in partnership with NFAT2 and NFκB p65, specifically. This has important implications for selective targeting of transcription factors during HIV-1 infection since, over the course of HIV-1 progression/AIDS, IL-4 producing T cells frequently predominate and substantially contribute to disease pathology.
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