Control of neuronal growth cone navigation by asymmetric inositol 1,4,5-trisphosphate signals

Hiroki Akiyama, Toru Matsu-Ura, Katsuhiko Mikoshiba, Hiroyuki Kamiguchi

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Inositol 1,4,5-trisphosphate (IP3) is generally viewed as a global messenger that increases cytosolic calcium ion (Ca2+) concentration. However, the spatiotemporal dynamics of IP3 and the functional significance of localized IP3 production in cell polarity remain largely unknown. Here, we demonstrate the critical role of spatially restricted IP3 signals in axon guidance. We found that IP3 and ensuing Ca2+ signals were produced asymmetrically across growth cones exposed to an extracellular gradient of nerve growth factor (NGF) and mediated growth cone turning responses to NGF. Moreover, photolysisinduced production of IP3 on one side of a growth cone was sufficient to initiate growth cone turning toward the side with the higher concentration of IP3. Thus, locally produced IP3 encodes spatial information that polarizes the growth cone for guided migration.

Original languageEnglish
JournalScience Signaling
Volume2
Issue number79
DOIs
Publication statusPublished - 2009 Jul 14
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Molecular Biology
  • Medicine(all)

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