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Article Dans Une Revue Developmental Cell Année : 2022

Physical properties of the cytoplasm modulate the rates of microtubule polymerization and depolymerization

Résumé

The cytoplasm is a crowded, visco-elastic environment whose physical properties change according to physiological or developmental states. How the physical properties of the cytoplasm impact cellular functions in vivo remains poorly understood. Here, we probe the effects of cytoplasmic concentration on microtubules by applying osmotic shifts to fission yeast, moss, and mammalian cells. We show that the rates of both microtubule polymerization and depolymerization scale linearly and inversely with cytoplasmic concentration; an increase in cytoplasmic concentration decreases the rates of microtubule polymerization and depolymerization proportionally, whereas a decrease in cytoplasmic concentration leads to the opposite. Numerous lines of evidence indicate that these effects are due to changes in cytoplasmic viscosity rather than cellular stress responses or macromolecular crowding per se. We reconstituted these effects on microtubules in vitro by tuning viscosity. Our findings indicate that, even in normal conditions, the viscosity of the cytoplasm modulates the reactions that underlie microtubule dynamic behaviors.
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Dates et versions

hal-03632660 , version 1 (06-04-2022)

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Arthur Molines, Joël Lemière, Morgan Gazzola, Ida Emilie Steinmark, Claire Edrington, et al.. Physical properties of the cytoplasm modulate the rates of microtubule polymerization and depolymerization. Developmental Cell, 2022, 57 (4), pp.466-479.e6. ⟨10.1016/j.devcel.2022.02.001⟩. ⟨hal-03632660⟩
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