Spindle-F-actin Interactions in Mitotic Spindles in an Intact Vertebrate Epithelium

Overview

Journal Mol Biol Cell

Specialties Cell Biology
Molecular Biology

Date 2019 May 16

PMID 31091161

Citations 24

Authors

Angela M Kita

Zachary T Swider

Ivan Erofeev

Mary C Halloran

Andrew B Goryachev

William M Bement

Affiliations

Soon will be listed here.

Abstract

Mitotic spindles are well known to be assembled from and dependent on microtubules. In contrast, whether actin filaments (F-actin) are required for or are even present in mitotic spindles has long been controversial. Here we have developed improved methods for simultaneously preserving F-actin and microtubules in fixed samples and exploited them to demonstrate that F-actin is indeed associated with mitotic spindles in intact embryonic epithelia. We also find that there is an "F-actin cycle," in which the distribution and organization of spindle F-actin changes over the course of the cell cycle. Live imaging using a probe for F-actin reveals that at least two pools of F-actin are associated with mitotic spindles: a relatively stable internal network of cables that moves in concert with and appears to be linked to spindles, and F-actin "fingers" that rapidly extend from the cell cortex toward the spindle and make transient contact with the spindle poles. We conclude that there is a robust endoplasmic F-actin network in normal vertebrate epithelial cells and that this network is also a component of mitotic spindles. More broadly, we conclude that there is far more internal F-actin in epithelial cells than is commonly believed.

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