The DHX33 RNA helicase senses cytosolic RNA and activates the NLRP3 inflammasome.

The DHX33 RNA helicase senses cytosolic RNA and activates the NLRP3 inflammasome.
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DOI:
10.1016/j.immuni.2013.07.001
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发表时间:
2013-07-25
期刊:
影响因子:
32.4
通讯作者:
Liu YJ
Liu YJ
中科院分区:
医学1区
文献类型:
--
作者:
Mitoma H;Hanabuchi S;Kim T;Bao M;Zhang Z;Sugimoto N;Liu YJ

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The NLRP3 inflammasome plays a major role in innate immune responses by activating caspase-1, resulting in secretion of interleukin (IL)-18 and IL-1β. Although cytosolic double-stranded RNA (dsRNA) and bacterial RNA are known to activate the NLRP3 inflammasome, the upstream sensor is unknown. We investigated the potential function of DExD/H-box RNA helicase family members (previously shown to sense cytosolic DNA and RNA to induce type 1 interferon responses) in RNA-induced NLRP3 inflammasome activation. Among the helicase family members tested, we found that targeting of DHX33 expression by short hairpin RNA efficiently blocked the activation of caspase-1 and secretion of IL-18/IL-1β in human macrophages that were activated by cytosolic poly I:C, reoviral RNA or bacterial RNA. DHX33 bound dsRNA via the helicase C domain. DHX33 interacted with NLRP3 and formed the inflammasome complex following stimulation with RNA. We, therefore, identified DHX33 as a cytosolic RNA sensor that activates the NLRP3 inflammasome.
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