Decreased Dicer expression elicits DNA damage and up-regulation of MICA and MICB.

Decreased Dicer expression elicits DNA damage and up-regulation of MICA and MICB.
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Dicer 表达减少会引起 DNA 损伤以及 MICA 和 MICB 上调。

DOI:
10.1083/jcb.200801169
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发表时间:
2008-07-28
影响因子:
7.8
通讯作者:
He, Cai-Xia
He, Cai-Xia
中科院分区:
生物学1区
文献类型:
--
作者:
Tang, Kai-Fu;Ren, Hong;Cao, Jia;Zeng, Gui-Li;Xie, Jing;Chen, Min;Wang, Lu;He, Cai-Xia

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RNA 干扰 (RNAi) 会持续沉默先天免疫反应,而先天免疫基因在 Dicer 缺陷的秀丽隐杆线虫中受到错误调节。在这里,我们发现在人类细胞中通过 RNAi 抑制 Dicer 表达会上调主要组织相容性复合物 I 类相关分子 A 和 B(MICA 和 MICB)。 MICA 和 MICB 是自然杀伤细胞和活化的 CD8(+)T 细胞表达的 NKG2D 受体的先天免疫系统配体。我们发现 Dicer 的敲低会引起 DNA 损伤。通过对 DNA 损伤途径成分(包括共济失调毛细血管扩张突变 (ATM) 激酶、ATM 和 Rad3 相关激酶或检查点激酶 1)的药理或遗传抑制,可防止 Dicer 敲低对 MICA 和 MICB 的上调。因此,我们得出结论,MICA 和 MICB 的上调是 Dicer 敲低引起的 DNA 损伤反应激活的结果。我们的研究结果表明,RNAi 通过 DNA 损伤途径与人类先天免疫系统间接相关。
RNA interference (RNAi) acts constitutively to silence the innate immune response, and innate immunity genes are misregulated in Dicer-deficient Caenorhabditis elegans. Here, we show that inhibition of Dicer expression by RNAi in human cells up-regulates major histocompatibility complex class I–related molecules A and B (MICA and MICB). MICA and MICB are innate immune system ligands for the NKG2D receptor expressed by natural killer cells and activated CD8(+)T cells. We reveal that knockdown of Dicer elicits DNA damage. Up-regulation of MICA and MICB by Dicer knockdown is prevented by pharmacologic or genetic inhibition of DNA damage pathway components, including ataxia telangiectasia mutated (ATM) kinase, ATM- and Rad3-related kinase, or checkpoint kinase 1. Therefore we conclude that up-regulation of MICA and MICB is the result of DNA damage response activation caused by Dicer knockdown. Our results suggest that RNAi is indirectly linked to the human innate immune system via the DNA damage pathway.
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