Ca2+-independent phospholipase A2-dependent sustained Rho-kinase activation exhibits all-or-none response

Akio Maeda, Yu Ichi Ozaki, Sudhir Sivakumaran, Tetsuro Akiyama, Hidetoshi Urakubo, Ayako Usami, Miharu Sato, Kozo Kaibuchi, Shinya Kuroda

研究成果: Article査読

25 被引用数 (Scopus)


Sustained contraction of cells depends on sustained Rho-associated kinase (Rho-kinase) activation. We developed a computational model of the Rho-kinase pathway to understand the systems characteristics. Thrombin-dependent in vivo transient responses of Rho activation and Ca2+ increase could be reproduced in silico. Low and high thrombin stimulation induced transient and sustained phosphorylation, respectively, of myosin light chain (MLC) and myosin phosphatase targeting subunit 1 (MYPT1) in vivo. The transient phosphorylation of MLC and MYPT1 could be reproduced in silico, but their sustained phosphorylation could not. This discrepancy between in vivo and in silico in the sustained responses downstream of Rho-kinase indicates that a missing pathway(s) may be responsible for the sustained Rho-kinase activation. We found, experimentally, that the sustained phosphorylation of MLC and MYPT1 exhibit all-or-none responses. Bromoenol lactone, a specific inhibitor of Ca2+-independent phospholipase A2 (iPLA2), inhibited sustained phosphorylation of MLC and MYPT1, which indicates that sustained Rho-kinase activation requires iPLA2 activity. Thus, the systems analysis of the Rho-kinase pathway identified a novel iPLA2-dependent mechanism of the sustained Rho-kinase activation, which exhibits an all-or-none response.

ジャーナルGenes to Cells
出版ステータスPublished - 09-2006

All Science Journal Classification (ASJC) codes

  • 遺伝学
  • 細胞生物学


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