Mechanically Distinct Microtubule Arrays Determine the Length and Force Response of the Meiotic Spindle.
Dev Cell
; 49(2): 267-278.e5, 2019 04 22.
Article
em En
| MEDLINE
| ID: mdl-30982663
ABSTRACT
The microtubule-based spindle is subjected to various mechanical forces during cell division. How the structure generates and responds to forces while maintaining overall integrity is unknown because we have a poor understanding of the relationship between filament architecture and mechanics. Here, to fill this gap, we combine microneedle-based quantitative micromanipulation with high-resolution imaging, simultaneously analyzing forces and local filament motility in the Xenopus meiotic spindle. We find that microtubules exhibit a compliant, fluid-like mechanical response at the middle of the spindle half, being distinct from those near the pole and the equator. A force altering spindle length induces filament sliding at this compliant array, where parallel microtubules predominate, without influencing equatorial antiparallel filament dynamics. Molecular perturbations suggest that kinesin-5 and dynein contribute to the spindle's local mechanical difference. Together, our data establish a link between spindle architecture and mechanics and uncover the mechanical design of this essential cytoskeletal assembly.
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MEDLINE
Assunto principal:
Microtúbulos
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Fuso Acromático
Limite:
Animals
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article