Toll-like receptor-independent gene induction program activated by mammalian DNA escaped from apoptotic DNA degradation.

Toll-like receptor-independent gene induction program activated by mammalian DNA escaped from apoptotic DNA degradation.
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DOI:
10.1084/jem.20051654
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发表时间:
2005-11-21
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Nagata S
Nagata S
中科院分区:
其他
文献类型:
--
作者:
Okabe Y;Kawane K;Akira S;Taniguchi T;Nagata S

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巨噬细胞中的脱氧核糖核酸酶(DNase) II可切割吞噬的凋亡细胞和从红系前体细胞排出的细胞核的DNA。DNA酶ii缺陷小鼠胚胎在巨噬细胞中积累未消化的DNA,并因干扰素β (IFN β)基因的激活而死亡。在这里,我们发现DNase II−/−胎儿肝脏中的f4 /80阳性巨噬细胞特异性地产生一系列细胞因子,如IFNβ、TNFα和CXCL10。而ifn诱导基因(2 ' 5 ' -oligo(A)合成酶、IRF7和ISG15)不仅在巨噬细胞中表达,也在其他f4 /80阴性细胞中表达。当DNase II−/−巨噬细胞或胚胎成纤维细胞吞噬凋亡细胞时,它们表达IFN β和CXCL10基因。toll样受体(TLR) 3和9及其接头分子(MyD88和TRIF)的消融对DNase II−/−小鼠的致死率没有影响。这些结果表明,存在一种不依赖tlr的感知机制来激活内源性DNA逃避溶酶体降解的先天免疫。
Deoxyribonuclease (DNase) II in macrophages cleaves the DNA of engulfed apoptotic cells and of nuclei expelled from erythroid precursor cells. DNase II–deficient mouse embryos accumulate undigested DNA in macrophages, and die in feto because of the activation of the interferon β (IFN β) gene. Here, we found that the F4/80-positive macrophages in DNase II −/− fetal liver specifically produce a set of cytokines such as IFNβ, TNFα, and CXCL10. Whereas, IFN-inducible genes (2′5′-oligo(A) synthetase, IRF7, and ISG15) were expressed not only in macrophages but also in other F4/80-negative cells. When DNase II −/− macrophages or embryonal fibroblasts engulfed apoptotic cells, they expressed the IFN β and CXCL10 genes. The ablation of Toll-like receptor (TLR) 3 and 9, or their adaptor molecules (MyD88 and TRIF), had no effect on the lethality of the DNase II −/− mice. These results indicate that there is a TLR-independent sensing mechanism to activate the innate immunity for the endogenous DNA escaping lysosomal degradation.
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影响因子: 56.9
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