ジャーナル: Cell Rep / 年: 2023 タイトル: The architecture of Cidec-mediated interfaces between lipid droplets. 著者: Iva Ganeva / Koini Lim / Jerome Boulanger / Patrick C Hoffmann / Olivia Muriel / Alicia C Borgeaud / Wim J H Hagen / David B Savage / Wanda Kukulski / 要旨: Lipid droplets (LDs) are intracellular organelles responsible for storing surplus energy as neutral lipids. Their size and number vary enormously. In white adipocytes, LDs can reach 100 μm in ...Lipid droplets (LDs) are intracellular organelles responsible for storing surplus energy as neutral lipids. Their size and number vary enormously. In white adipocytes, LDs can reach 100 μm in diameter, occupying >90% of the cell. Cidec, which is strictly required for the formation of large LDs, is concentrated at interfaces between adjacent LDs and facilitates directional flux of neutral lipids from the smaller to the larger LD. The mechanism of lipid transfer is unclear, in part because the architecture of interfaces between LDs remains elusive. Here we visualize interfaces between LDs by electron cryo-tomography and analyze the kinetics of lipid transfer by quantitative live fluorescence microscopy. We show that transfer occurs through closely apposed monolayers, is slowed down by increasing the distance between the monolayers, and follows exponential kinetics. Our data corroborate the notion that Cidec facilitates pressure-driven transfer of neutral lipids through two "leaky" monolayers between LDs.
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 kV / 集束イオンビーム - 電流: 1 nA / 集束イオンビーム - 時間: 2000 sec. / 集束イオンビーム - 温度: 100 K / 集束イオンビーム - Initial thickness: 1000 nm / 集束イオンビーム - 最終 厚さ: 100 nm 集束イオンビーム - 詳細: Rough milling: 30 kV, 1-0.1 nA. Fine milling: 16kV, 23 pA.. The value given for _em_focused_ion_beam.instrument is FEI Scios. This is not in a list of allowed ...集束イオンビーム - 詳細: Rough milling: 30 kV, 1-0.1 nA. Fine milling: 16kV, 23 pA.. The value given for _em_focused_ion_beam.instrument is FEI Scios. This is not in a list of allowed values {'OTHER', 'DB235'} so OTHER is written into the XML file.