Superresolution Microscopy Reveals Actomyosin Dynamics in Medioapical Arrays

Overview

Journal Mol Biol Cell

Specialties Cell Biology
Molecular Biology

Date 2022 May 11

PMID 35544300

Authors

Regan P Moore

Stephanie M Fogerson

U Serdar Tulu

Jason W Yu

Amanda H Cox

Melissa A Sican

Dong Li

Wesley R Legant

Aubrey V Weigel

Janice M Crawford

Eric Betzig

Daniel P Kiehart

Affiliations

Soon will be listed here.

Abstract

Arrays of actin filaments (F-actin) near the apical surface of epithelial cells (medioapical arrays) contribute to apical constriction and morphogenesis throughout phylogeny. Here, superresolution approaches (grazing incidence structured illumination, GI-SIM, and lattice light sheet, LLSM) microscopy resolve individual, fluorescently labeled F-actin and bipolar myosin filaments that drive amnioserosa cell shape changes during dorsal closure in . In expanded cells, F-actin and myosin form loose, apically domed meshworks at the plasma membrane. The arrays condense as cells contract, drawing the domes into the plane of the junctional belts. As condensation continues, individual filaments are no longer uniformly apparent. As cells expand, arrays of actomyosin are again resolved-some F-actin turnover likely occurs, but a large fraction of existing filaments rearrange. In morphologically isotropic cells, actin filaments are randomly oriented and during contraction are drawn together but remain essentially randomly oriented. In anisotropic cells, largely parallel actin filaments are drawn closer to one another. Our images offer unparalleled resolution of F-actin in embryonic tissue, show that medioapical arrays are tightly apposed to the plasma membrane and are continuous with meshworks of lamellar F-actin. Medioapical arrays thereby constitute modified cell cortex. In concert with other tagged array components, superresolution imaging of live specimens will offer new understanding of cortical architecture and function.

Citing Articles

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