SRRF-Stream Imaging of Optogenetically Controlled Furrow Formation Shows Localized and Coordinated Endocytosis and Exocytosis Mediating Membrane Remodeling
mediaposted on 14.03.2020, 15:13 authored by Jean A. Castillo-Badillo, Anoop C. Bandi, Suyash Harlalka, N. Gautam
Cleavage furrow formation during cytokinesis involves extensive membrane remodeling. In the absence of methods to exert dynamic control over these processes, it has been a challenge to examine the basis of this remodeling. Here we used a subcellular optogenetic approach to induce this at will and found that furrow formation is mediated by actomyosin contractility, retrograde plasma membrane flow, localized decrease in membrane tension, and endocytosis. FRAP, 4-D imaging, and inhibition or upregulation of endocytosis or exocytosis show that ARF6 and Exo70 dependent localized exocytosis supports a potential model for intercellular bridge elongation. TIRF and Super Resolution Radial Fluctuation (SRRF) stream microscopy show localized VAMP2-mediated exocytosis and incorporation of membrane lipids from vesicles into the plasma membrane at the front edge of the nascent daughter cell. Thus, spatially separated but coordinated plasma membrane depletion and addition are likely contributors to membrane remodeling during cytokinetic processes.
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exocytosis showExo 70VAMP 2-mediated exocytosisactomyosin contractilitymembrane tensionFRAPSRRF-Stream Imagingmembrane lipidsplasma membrane depletionfront edgeplasma membraneTIRFARF 6plasma membrane flowsubcellular optogenetic approachdaughter cellfurrow formationintercellular bridge elongationstream microscopy show4- D imagingExocytosis Mediating Membrane Remodeling Cleavage furrow formationOptogenetically Controlled Furrow Formation Shows LocalizedSuper Resolution Radial Fluctuationcytokinetic processes