イシヅカ　ユウタ   Yuta Ishizuka   石塚　佑太    所属   川崎医科大学  医学部 基礎医学　病態代謝学    職種   講師
論文種別	原著
言語種別	英語
査読の有無	査読あり
表題	Myosin II ATPase activity mediates the long-term potentiation-induced exodus of stable F-actin bound by drebrin A from dendritic spines.
掲載誌名	正式名：PloS one 略　 称：PLoS One ISSNコード：19326203/19326203
掲載区分	国外
出版社	PLOS
巻・号・頁	9(1),pp.e85367
著者・共著者	Toshiyuki Mizui, Yuko Sekino, Hiroyuki Yamazaki, Yuta Ishizuka, Hideto Takahashi, Nobuhiko Kojima, Masami Kojima , Tomoaki Shirao*
発行年月	2014/01
概要	The neuronal actin-binding protein drebrin A forms a stable structure with F-actin in dendritic spines. NMDA receptor activation causes an exodus of F-actin bound by drebrin A (DA-actin) from dendritic spines, suggesting a pivotal role for DA-actin exodus in synaptic plasticity. We quantitatively assessed the extent of DA-actin localization to spines using the spine-dendrite ratio of drebrin A in cultured hippocampal neurons, and found that (1) chemical long-term potentiation (LTP) stimulation induces rapid DA-actin exodus and subsequent DA-actin re-entry in dendritic spines, (2) Ca(2+) influx through NMDA receptors regulates the exodus and the basal accumulation of DA-actin, and (3) the DA-actin exodus is blocked by myosin II ATPase inhibitor, but is not blocked by myosin light chain kinase (MLCK) or Rho-associated kinase (ROCK) inhibitors. These results indicate that myosin II mediates the interaction between NMDA receptor activation and DA-actin exodus in LTP induction. Furthermore, myosin II seems to be activated by a rapid actin-linked mechanism rather than slow MLC phosphorylation. Thus the myosin-II mediated DA-actin exodus might be an initial event in LTP induction, triggering actin polymerization and spine enlargement.
DOI	10.1371/journal.pone.0085367
PMID	24465547