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Title
  • en Different contributions of nonmuscle myosin IIA and IIB to the organization of stress fiber subtypes in fibroblasts
Creator
    • en Kuragano, Masahiro
    • en Uyeda, Taro Q. P.
    • en Kamijo, Keiju
Accessrights open access
Rights
Subject
  • NDC 460
Description
  • Abstract en Stress fibers (SFs) are contractile, force-generating bundled structures that can be classified into three subtypes, namely ventral SFs (vSFs), transverse arcs (TAs), and dorsal SFs. Nonmuscle myosin II (NMII) is the main component of SFs. This study examined the roles of the NMII isoforms NMIIA and NMIIB in the organization of each SF subtype in immortalized fibroblasts. Knockdown (KD) of NMIIA (a major isoform) resulted in loss of TAs from the lamella and caused the lamella to lose its flattened shape. Exogenous expression of NMIIB rescued this defect in TA formation. However, the TAs that formed on exogenous NMIIB expression in NMIIA-KD cells and the remaining TAs in NMIIB-KD cells, which mainly consisted of NMIIB and NMIIA, respectively, failed to rescue the defect in lamellar flattening. These results indicate that both isoforms are required for the proper function of TAs in lamellar flattening. KD of NMIIB resulted in loss of vSFs from the central region of the cell body, and this defect was not rescued by exogenous expression of NMIIA, indicating that NMIIA cannot replace the function of NMIIB in vSF formation. Moreover, we raised the possibility that actin filaments in vSFs are in a stretched conformation.
Publisher en American Society for Cell Biology
Date
    Issued2018-04-15
Language
  • eng
Resource Type journal article
Version Type VoR
Identifier HDL http://hdl.handle.net/2115/71475
Relation
  • isIdenticalTo DOI https://doi.org/10.1091/mbc.E17-04-0215
Journal
    • PISSN 1059-1524
      • en Molecular biology of the cell
      • Volume Number29 Issue Number8 Page Start911 Page End922
File
Oaidate 2023-07-26