Possible role of cortactin phosphorylation by protein kinase Cα in actin-bundle formation at growth cone

Hiroshi Yamada, Tatsuya Kikuchi, Toshio Masumoto, Fan Yan Wei, Tadashi Abe, Tetsuya Takeda, Teiichi Nishiki, Kazuhito Tomizawa, Masami Watanabe, Hideki Matsui, Kohji Takei

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Background Information: Cortactin contributes to growth cone morphogenesis by forming with dynamin, ring-shaped complexes that mechanically bundle and stabilise F-actin. However, the regulatory mechanism of cortactin action is poorly understood. Results: Immunofluorescence microscopy revealed that protein kinase C (PKC) α colocalises with cortactin at growth cone filopodia in SH-SY5Y neuroblastoma cells. PKC activation by phorbol 12-myristate 13-acetate causes cortactin phosphorylation, filopodial retraction and F-actin-bundle loss. Moreover, PKCα directly phosphorylates cortactin in vitro at S135/T145/S172, mitigating both cortactin's actin-binding and actin-crosslinking activity, whereas cellular expression of a phosphorylation-mimetic cortactin mutant hinders filopodial formation with a significant decrease of actin bundles. Conclusions: Our results indicate that PKC-mediated cortactin phosphorylation might be implicated in the maintenance of growth cone.

Original languageEnglish
Pages (from-to)319-330
Number of pages12
JournalBiology of the Cell
Volume107
Issue number9
DOIs
Publication statusPublished - Sep 1 2015

Keywords

  • Actin bundle
  • Cortactin
  • Growth cone
  • Protein kinase C

ASJC Scopus subject areas

  • Cell Biology

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