Rotation of stress fibers as a single wheel in migrating fish keratocytes

Scientific Reports
Chika OkimuraYoshiaki Iwadate

Abstract

Crawling migration plays an essential role in a variety of biological phenomena, including development, wound healing, and immune system function. Keratocytes are wound-healing cells in fish skin. Expansion of the leading edge of keratocytes and retraction of the rear are respectively induced by actin polymerization and contraction of stress fibers in the same way as for other cell types. Interestingly, stress fibers in keratocytes align almost perpendicular to the migration-direction. It seems that in order to efficiently retract the rear, it is better that the stress fibers align parallel to it. From the unique alignment of stress fibers in keratocytes, we speculated that the stress fibers may play a role for migration other than the retraction. Here, we reveal that the stress fibers are stereoscopically arranged so as to surround the cytoplasm in the cell body; we directly show, in sequential three-dimensional recordings, their rolling motion during migration. Removal of the stress fibers decreased migration velocity and induced the collapse of the left-right balance of crawling migration. The rotation of these stress fibers plays the role of a "wheel" in crawling migration of keratocytes.

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Citations

Nov 14, 2019·Seminars in Cell & Developmental Biology·Alex MogilnerKinneret Keren
Apr 14, 2021·Nature Communications·Liliana BarbieriMarco Fritzsche
Aug 13, 2021·PLoS Computational Biology·Daisuke ImotoSatoshi Sawai

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BETA
confocal microscopy

Software Mentioned

FluoRender

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