Wang Li-Jie, Huang Hsin-Yi, Huang Meng-Pin, Liou Willisa, Chang Ya-Ting, Wu Chih-Ching, Ojcius David M, Chang Yu-Sun
From the Molecular Medicine Research Center.
the Graduate Institutse of Biomedical Sciences, College of Medicine.
J Biol Chem. 2014 Oct 17;289(42):29322-33. doi: 10.1074/jbc.M114.559153. Epub 2014 Aug 27.
Inflammasomes are multi-protein complexes that regulate chronic inflammation-associated diseases by inducing interleukin-1 β (IL-1β) secretion. Numerous components involved in inflammasome activation have been identified, but the mechanisms of inflammasome-mediated IL-1β secretion have not yet been fully explored. Here, we demonstrate that end-binding protein 1 (EB1), which is required for activation of AIM2 inflammasome complex, links the AIM2 inflammasome to autophagy-dependent secretion. Imaging studies revealed that AIM2 inflammasomes colocalize with microtubule organizing centers and autophagosomes. Biochemical analyses showed that poly(dA-dT)-activated AIM2 inflammasomes induce autophagy and IL-1β secretion in an LC3-dependent fashion. Furthermore, depletion of EB1 decreases autophagic shedding and intracellular trafficking. Finally, we found that the 5'-AMP activated protein kinase may regulate this EB1-mediated autophagy-based inflammasome-induced secretion of IL-1β. These findings reveal a novel EB1-mediated pathway for the secretion of IL-1β.
炎性小体是多蛋白复合物,通过诱导白细胞介素-1β(IL-1β)分泌来调节慢性炎症相关疾病。已经鉴定出许多参与炎性小体激活的成分,但炎性小体介导的IL-1β分泌机制尚未得到充分探索。在此,我们证明激活AIM2炎性小体复合物所需的末端结合蛋白1(EB1)将AIM2炎性小体与自噬依赖性分泌联系起来。成像研究显示,AIM2炎性小体与微管组织中心和自噬体共定位。生化分析表明,聚(dA-dT)激活的AIM2炎性小体以LC3依赖性方式诱导自噬和IL-1β分泌。此外,EB1的缺失会减少自噬脱落和细胞内运输。最后,我们发现5'-AMP激活的蛋白激酶可能调节这种由EB1介导的基于自噬的炎性小体诱导的IL-1β分泌。这些发现揭示了一种新的EB1介导的IL-1β分泌途径。
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