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DOI | 10.1126/science.aas8995 |
HDAC6 mediates an aggresome-like mechanism for NLRP3 and pyrin inflammasome activation | |
Venkat Giri Magupalli; Roberto Negro; Yuzi Tian; Arthur V. Hauenstein; Giuseppe Di Caprio; Wesley Skillern; Qiufang Deng; Pontus Orning; Hasan B. Alam; Zoltan Maliga; Humayun Sharif; Jun Jacob Hu; Charles L. Evavold; Jonathan C. Kagan; Florian I. Schmidt; Katherine A. Fitzgerald; Tom Kirchhausen; Yongqing Li; Hao Wu | |
2020-09-18 | |
发表期刊 | Science |
出版年 | 2020 |
英文摘要 | Inflammasome complexes are formed in response to pathogen-associated molecules. They initiate both the maturation of inflammatory cytokines and pyroptosis, a type of programmed cell death. One notable feature for inflammasome activation is the formation of a single supramolecular punctum (or “speck”) in each affected cell. However, the location and mechanism of speck formation is poorly understood. Magupalli et al. report that for NLRP3- and pyrin-mediated inflammasomes, their assembly and downstream functions occur at the microtubule-organizing center (MTOC). This process requires the dynein adaptor HDAC6, which is also a central player in aggresome formation and autophagosomal degradation at the MTOC. This work links several important cellular processes and provides clues for how inflammasomes are efficiently regulated.
Science , this issue p. [eaas8995][1]
### INTRODUCTION
Canonical inflammasomes are multicomponent protein complexes that play key roles in immune surveillance of infections and danger by activating caspase-1, which cleaves interleukin 1β (IL-1β) and the pore-forming protein gasdermin D, leading to cytokine maturation and pyroptosis. The nucleotide-binding domain, leucine-rich repeat, and pyrin domain–containing protein 3 (NLRP3) can be activated by the bacterial toxin nigericin, extracellular ATP, and various particulates such as monosodium urate (MSU) crystals, alum, silica, and amyloids, whereas the pyrin inflammasome can be stimulated by the Rho-glucosylation activity of Clostridium difficile toxin B. One important hallmark for inflammasome activation is the formation of a single supramolecular punctum (also known as a speck) per cell. However, the location and trafficking of such puncta remain unknown.
### RATIONALE
To decode the site and the molecular machinery in inflammasome assembly and activation in macrophages, we aimed to visualize inflammasome assembly by cellular imaging complemented by pharmacological inhibition and targeted deletion in cells and in mice.
### RESULTS
We found that NLRP3 and pyrin inflammasomes are assembled at the centrosome, also known as the microtubule-organizing center (MTOC), of each cell, which serves as the major site for caspase-1 activation and IL-1β conversion. Pharmacological inhibitors of microtubule polymerization, dynein ATPase and the dynein adaptor histone deacetylase 6 (HDAC6), and targeted deletion or knockdown of Hdac6 compromised the assembly and activation of these inflammasomes. Reconstitution of Hdac6 −/− macrophages showed that the ubiquitin-binding ability of HDAC6, but not its deacetylase activity, is required for NLRP3 and pyrin inflammasome activation. In mice, Hdac6 deficiency reduced lipopolysaccharide- and MSU-induced inflammation to a similar extent as direct NLRP3 inhibition, which demonstrates the requirement of HDAC6 and the microtubule retrograde transport machinery for NLRP3 activation. By contrast, AIM2 and NLRC4 inflammasome puncta do not localize at the MTOC, and these inflammasomes do not require microtubule retrograde transport for their activation. Thus, our studies revealed a specific mechanism of inflammasome activation for NLRP3 and pyrin.
For the NLRP3 inflammasome, MTOC localization may facilitate association with the centrosome-localized kinase NEK7 to enhance inflammasome assembly. We found that in Hdac6 −/− macrophages, NLRP3 is trapped as small speckles at the trans-Golgi network (TGN), a previously recognized common site for NLRP3 association upon induction by multiple NLRP3 stimulators. These data suggested that HDAC6-mediated microtubule transport delivers NLRP3 from TGN to the MTOC. The NLRP3 inflammasome formed at the MTOC colocalizes with LC3b, an autophagy marker, and an autophagy inhibitor enhances NLRP3-induced IL-1β secretion.
### CONCLUSION
Our study reveals an unexpected parallel between HDAC6-dependent assembly of NLRP3 and pyrin inflammasomes and the formation of aggresomes at the MTOC for autophagic degradation of ubiquitinated pathological aggregates. The dual activating and inhibiting roles played by the MTOC localization of NLRP3 and pyrin inflammasomes may be critical for achieving balanced inflammasome regulation.
![Figure][2]
HDAC6- and microtubule-dependent assembly and activation of NLRP3 and pyrin inflammasomes.
Multiple stimuli for NLRP3 (MSU, silica, nigericin, and ATP) and pyrin (Rho GTPase modification) are shown on the top part of the cell. NLRP3 and pyrin inflammasome components are represented in pink and light blue, respectively. NLRP3 inflammasome assembly may involve two steps: initial oligomerization at the TGN and further assembly into a single punctum with the centrosomal kinase NEK7, the adaptor ASC, and caspase-1 at the MTOC. The latter is achieved after being retrograde transported on the microtubule by the HDAC6-dynein machinery. Pyrin inflammasome activation also requires HDAC6, dynein, and microtubules. Assembled inflammasomes at the MTOC are subject to degradation by autophagy in a manner similar to aggresomes that degrade pathological aggregates. [Figure was created with BioRender ( |
领域 | 气候变化 ; 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/295420 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Venkat Giri Magupalli,Roberto Negro,Yuzi Tian,et al. HDAC6 mediates an aggresome-like mechanism for NLRP3 and pyrin inflammasome activation[J]. Science,2020. |
APA | Venkat Giri Magupalli.,Roberto Negro.,Yuzi Tian.,Arthur V. Hauenstein.,Giuseppe Di Caprio.,...&Hao Wu.(2020).HDAC6 mediates an aggresome-like mechanism for NLRP3 and pyrin inflammasome activation.Science. |
MLA | Venkat Giri Magupalli,et al."HDAC6 mediates an aggresome-like mechanism for NLRP3 and pyrin inflammasome activation".Science (2020). |
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