ジャーナル: Nat Commun / 年: 2023 タイトル: Cryo-electron tomography of NLRP3-activated ASC complexes reveals organelle co-localization. 著者: Yangci Liu / Haoming Zhai / Helen Alemayehu / Jérôme Boulanger / Lee J Hopkins / Alicia C Borgeaud / Christina Heroven / Jonathan D Howe / Kendra E Leigh / Clare E Bryant / Yorgo Modis / 要旨: NLRP3 induces caspase-1-dependent pyroptotic cell death to drive inflammation. Aberrant activity of NLRP3 occurs in many human diseases. NLRP3 activation induces ASC polymerization into a single, ...NLRP3 induces caspase-1-dependent pyroptotic cell death to drive inflammation. Aberrant activity of NLRP3 occurs in many human diseases. NLRP3 activation induces ASC polymerization into a single, micron-scale perinuclear punctum. Higher resolution imaging of this signaling platform is needed to understand how it induces pyroptosis. Here, we apply correlative cryo-light microscopy and cryo-electron tomography to visualize ASC/caspase-1 in NLRP3-activated cells. The puncta are composed of branched ASC filaments, with a tubular core formed by the pyrin domain. Ribosomes and Golgi-like or endosomal vesicles permeate the filament network, consistent with roles for these organelles in NLRP3 activation. Mitochondria are not associated with ASC but have outer-membrane discontinuities the same size as gasdermin D pores, consistent with our data showing gasdermin D associates with mitochondria and contributes to mitochondrial depolarization.
凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 293 K / 装置: LEICA EM GP
切片作成
集束イオンビーム - 装置: OTHER / 集束イオンビーム - イオン: OTHER / 集束イオンビーム - 電圧: 30 / 集束イオンビーム - 電流: 1 / 集束イオンビーム - 時間: 1500 / 集束イオンビーム - 温度: 83 K / 集束イオンビーム - Initial thickness: 10000 / 集束イオンビーム - 最終 厚さ: 200 集束イオンビーム - 詳細: Lamella were made using a Scios DualBeam FIB/SEM (FEI) equipped with a Quorum cryo-stage (PP3010T). Rough milling was performed using 0.5 to 0.1 nA current. Fine ...集束イオンビーム - 詳細: Lamella were made using a Scios DualBeam FIB/SEM (FEI) equipped with a Quorum cryo-stage (PP3010T). Rough milling was performed using 0.5 to 0.1 nA current. Fine milling was done using 50 to 10 pA current..
-
電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
特殊光学系
エネルギーフィルター - 名称: GIF Quantum LS / エネルギーフィルター - スリット幅: 20 eV