Resolution of macropinosomes, phagosomes and autolysosomes: Osmotically driven shrinkage enables tubulation and vesiculation

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Spencer A Freeman, Sergio Grinstein

Abstract

Macropinosomes, phagosomes and autolysosomes are comparatively large, quasi-spherical organelles that play essential functions in immunity and homeostasis. These vacuolar organelles are relatively short-lived, promptly fragmenting into smaller structures. Vacuolar resolution is mediated by tubulation and vesiculation, processes orchestrated by protein complexes that are recruited to highly curved membranes. Importantly, the surface-to-volume ratios of the tubules and vesicles generated during the resolution process are considerably larger than that of the parental vacuole. Because membranes under high hydrostatic tension resist deformation, an active, concomitant loss of volume is required to sustain the resolution process and may even initiate tubulation and vesiculation. Despite its fundamental role in membrane remodeling, the mechanisms that account for organellar volume loss are poorly understood, but are likely to involve the export of solutes followed by osmotically obliged water. In this review, we describe the principles and possible mechanisms underlying the resolution of organelles, with particular attention paid to the osmolytes they contain and the pathways mediating their exit.

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Feb 13, 2020·Current Pharmaceutical Design·Andrea E TothMorten S Nielsen
Aug 7, 2020·The FEBS Journal·Roni Levin-Konigsberg, Adriana R Mantegazza
Nov 13, 2020·Science Advances·Cheng-Chang ChenChristian Grimm
Dec 8, 2020·Frontiers in Immunology·Whijin Kwon, Spencer A Freeman
Jan 26, 2021·Frontiers in Cell and Developmental Biology·Amra Saric, Spencer A Freeman
Mar 13, 2021·Frontiers in Cell and Developmental Biology·Shroddha BoseTobias Stauber
Mar 16, 2021·Frontiers in Oncology·Maria Paz Hernández-CáceresCristina Bertocchi
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Dec 7, 2020·Biochimica Et Biophysica Acta. Molecular Cell Research·Cheng-Chang ChenChristian Grimm
Jul 4, 2021·Science Advances·Stine Lauritzen SønderJesper Nylandsted

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