The circadian regulator BMAL1 programmes responses to parasitic worm infection via a dendritic cell clock.

The circadian regulator BMAL1 programmes responses to parasitic worm infection via a dendritic cell clock.
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DOI:
10.1038/s41598-018-22021-5
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发表时间:
2018-02-28
期刊:
影响因子:
4.6
通讯作者:
Else KJ
Else KJ
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Hopwood TW;Hall S;Begley N;Forman R;Brown S;Vonslow R;Saer B;Little MC;Murphy EA;Hurst RJ;Ray DW;MacDonald AS;Brass A;Bechtold DA;Gibbs JE;Loudon AS;Else KJ

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对肠道寄生虫Trichuris Muris的抵抗需要T-helper 2(TH2)细胞和相关的IgG1反应,在小鼠身上通常需要长达4周的排泄。在这里,我们表明,初始感染的时间影响驱虫效率,在早晨感染的小鼠中具有强烈的TH2偏向和早期排虫。相反,在夜间开始感染的小鼠表现出对感染的延迟抵抗力,这与摄食驱动的新陈代谢信号有关,因此正常夜间摄食的小鼠白天的摄食限制扰乱了寄生虫的排出动力学。我们在体内删除了抗原提呈树突状细胞(DC)中的昼夜节律调节基因BMAL1,发现蠕虫排出失去了对时间的依赖性。RNAseq分析表明,昼夜同步的DC对蠕虫抗原的IL-12反应依赖于BMAL1。因此,我们发现DC中的昼夜节律机制有助于TH1/TH2平衡,并且DC时钟的环境或遗传扰动导致寄生虫排出动力学的改变。
Resistance to the intestinal parasitic helminth Trichuris muris requires T-helper 2 (TH2) cellular and associated IgG1 responses, with expulsion typically taking up to 4 weeks in mice. Here, we show that the time-of-day of the initial infection affects efficiency of worm expulsion, with strong TH2 bias and early expulsion in morning-infected mice. Conversely, mice infected at the start of the night show delayed resistance to infection, and this is associated with feeding-driven metabolic cues, such that feeding restriction to the day-time in normally nocturnal-feeding mice disrupts parasitic expulsion kinetics. We deleted the circadian regulator BMAL1 in antigen-presenting dendritic cells (DCs) in vivo and found a loss of time-of-day dependency of helminth expulsion. RNAseq analyses revealed that IL-12 responses to worm antigen by circadian-synchronised DCs were dependent on BMAL1. Therefore, we find that circadian machinery in DCs contributes to the TH1/TH2 balance, and that environmental, or genetic perturbation of the DC clock results in altered parasite expulsion kinetics.
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