Cofilin regulates actin network homeostasis and microvilli length in mouse oocytes.
J Cell Sci
; 134(24)2021 12 15.
Article
em En
| MEDLINE
| ID: mdl-34841429
ABSTRACT
How multiple actin networks coexist in a common cytoplasm while competing for a shared pool of monomers is still an ongoing question. This is exemplified by meiotic maturation in the mouse oocyte, which relies on the dynamic remodeling of distinct cortical and cytoplasmic F-actin networks. Here, we show that the conserved actin-depolymerizing factor cofilin is activated in a switch-like manner upon meiosis resumption from prophase arrest. Interfering with cofilin activation during maturation resulted in widespread elongation of microvilli, while cytoplasmic F-actin was depleted, leading to defects in spindle migration and polar body extrusion. In contrast, cofilin inactivation in metaphase II-arrested oocytes resulted in a shutdown of F-actin dynamics, along with a dramatic overgrowth of the polarized actin cap. However, inhibition of the Arp2/3 complex to promote actin cap disassembly elicited ectopic microvilli outgrowth in the polarized cortex. These data establish cofilin as a key player in actin network homeostasis in oocytes and reveal that microvilli can act as a sink for monomers upon disassembly of a competing network.
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Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Actinas
/
Fatores de Despolimerização de Actina
Limite:
Animals
Idioma:
En
Ano de publicação:
2021
Tipo de documento:
Article