Ca2+ influx through P2X receptors induces actin cytoskeleton reorganization by the formation of cofilin rods in neurites

Kohei Homma, Yusuke Niino, Kohji Hotta, Kotaro Oka

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

In physiological and pathological events, extracellular ATP plays an important role by controlling several types of purinergic receptors and changing cytoskeleton dynamics. To know the process of ATP-dependent cytoskeleton remodeling, we focused on cofilin, a key regulator of actin cytoskeleton, and investigated the dynamics of cofilin in PC12 cells through fluorescent protein-labeled cofilin and actin, Ca2+ imaging, and fluorescence resonance energy transfer (FRET) techniques. As a result, ATP induced intracellular Ca2+ increase, following cofilin rods' formation. ATP-induced cofilin rods' formation was not observed in cells expressing unphosphorylatable variant of cofilin. A P2X receptor agonist, but not P2Y, induced the formation of cofilin rods, whereas calmodulin and calcineurin inhibitors suppressed it. These results indicate that Ca2+ influx through P2X receptors induces the formation of cofilin rods via calcineurin-dependent dephosphorylation of cofilin. This pathway might be one candidate to explain the effects of ATP on neuronal development and injury.

Original languageEnglish
Pages (from-to)261-270
Number of pages10
JournalMolecular and Cellular Neuroscience
Volume37
Issue number2
DOIs
Publication statusPublished - 2008 Feb 1

Keywords

  • Actin
  • Calcium
  • Cofilin
  • FRET
  • PC12
  • Purinergic receptor

ASJC Scopus subject areas

  • Molecular Biology
  • Cellular and Molecular Neuroscience
  • Cell Biology

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