Iron Toxicity in the Retina Requires Alu RNA and the NLRP3 Inflammasome.

Iron Toxicity in the Retina Requires Alu RNA and the NLRP3 Inflammasome.
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视网膜中的铁毒性需要Alu RNA和NLRP3炎症体。

DOI:
10.1016/j.celrep.2015.05.023
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发表时间:
2015-06-23
期刊:
影响因子:
8.8
通讯作者:
Ambati J
Ambati J
中科院分区:
生物学1区
文献类型:
--
作者:
Gelfand BD;Wright CB;Kim Y;Yasuma T;Yasuma R;Li S;Fowler BJ;Bastos-Carvalho A;Kerur N;Uittenbogaard A;Han YS;Lou D;Kleinman ME;McDonald WH;Núñez G;Georgel P;Dunaief JL;Ambati J

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过量的铁会引起组织损伤,并与年龄相关性黄斑变性(AMD)有关。铁毒性被广泛认为是由芬顿反应形成羟基自由基引起的。我们报道,过量的铁,而不是其他Fenton催化金属,诱导NLRP3炎性小体的激活,这一途径也与AMD有关。此外,在缺乏炎性小体成分Caspase-1/11或Nlrp3或通过抑制Caspase-1,铁诱导的视网膜色素上皮(RPE)变性受到抑制。铁超载增加了短穿插核元件(sin)转录的rna的丰度:Alu rna和啮齿类等效的B1和B2 rna,它们是炎症小体激动剂。靶向Alu或B2 RNA可防止铁诱导的炎性体活化和RPE变性。铁诱导的SINE RNA积累是由于通过隔离辅助因子聚(C)结合蛋白2 (PCBP2)抑制DICER1。这些发现揭示了一个意想不到的铁毒性机制,与AMD和与铁过量相关的神经退行性疾病有关。
Excess iron induces tissue damage and is implicated in age-related macular degeneration (AMD). Iron toxicity is widely attributed to hydroxyl radical formation through Fenton's reaction. We report that excess iron, but not other Fenton catalytic metals, induces activation of the NLRP3 inflammasome, a pathway also implicated in AMD. Additionally, iron-induced degeneration of the retinal pigmented epithelium (RPE) is suppressed in mice lacking inflammasome components Caspase-1/11 or Nlrp3 or by inhibition of Caspase-1. Iron overload increases abundance of RNAs transcribed from short interspersed nuclear elements (SINEs): Alu RNAs and the rodent equivalent B1 and B2 RNAs, which are inflammasome agonists. Targeting Alu or B2 RNA prevents iron-induced inflammasome activation and RPE degeneration. Iron-induced SINE RNA accumulation is due to suppression of DICER1 via sequestration of the co-factor poly(C)-binding protein 2 (PCBP2). These findings reveal an unexpected mechanism of iron toxicity, with implications for AMD and neurodegenerative diseases associated with excess iron.
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