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J Cell Sci 2018 Jun 28;13112:. doi: 10.1242/jcs.212647.
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Septin-dependent remodeling of cortical microtubule drives cell reshaping during epithelial wound healing.

Shindo A , Audrey A , Takagishi M , Takahashi M , Wallingford JB , Kinoshita M .

Wounds in embryos heal rapidly through contraction of the wound edges. Despite well-recognized significance of the actomyosin purse string for wound closure, roles for other cytoskeletal components are largely unknown. Here, we report that the septin cytoskeleton cooperates with actomyosin and microtubules to coordinate circumferential contraction of the wound margin and concentric elongation of wound-proximal cells in Xenopus laevis embryos. Microtubules reoriented radially, forming bundles along lateral cell cortices in elongating wound-proximal cells. Depletion of septin 7 (Sept7) slowed wound closure by attenuating the wound edge contraction and cell elongation. ROCK/Rho-kinase inhibitor-mediated suppression of actomyosin contractility enhanced the Sept7 phenotype, whereas the Sept7 depletion did not affect the accumulation of actomyosin at the wound edge. The cortical microtubule bundles were reduced in wound-proximal cells in Sept7 knockdown (Sept7-KD) embryos, but forced bundling of microtubules mediated by the microtubule-stabilizing protein Map7 did not rescue the Sept7-KD phenotype. Nocodazole-mediated microtubule depolymerization enhanced the Sept7-KD phenotype, suggesting that Sept7 is required for microtubule reorganization during cell elongation. Our findings indicate that septins are required for the rapid wound closure by facilitating cortical microtubule reorganization and the concentric elongation of surrounding cells.

PubMed ID: 29777035
PMC ID: PMC6031381
Article link: J Cell Sci
Grant support: [+]

Species referenced: Xenopus laevis
Genes referenced: cfl1 map7 pxn septin2 septin6 septin7 septin9 tuba4b

References [+] :
Abreu-Blanco, Drosophila embryos close epithelial wounds using a combination of cellular protrusions and an actomyosin purse string. 2014, Pubmed