Phosphoinositide 3-kinase enhancer regulates neuronal dendritogenesis and survival in neocortex

Chi Bun Chan, Xia Liu, Sompol Pradoldej, Chunhai Hao, Jie An, Manuel Yepes, Hongbo R. Luo, Keqiang Ye

Research output: Contribution to journalArticle

45 Scopus citations

Abstract

Phosphoinositide 3-kinase enhancer (PIKE) binds and enhances phosphatidylinositol 3-kinase (PI3K)/Akt activities. However, its physiological functions in brain have never been explored. Here we show that PIKE is important in regulating the neuronal survival and development of neocortex. During development, enhanced apoptosis is observed in the ventricular zone of PIKE knock-out (PIKE-/-) cortex. Moreover, PIKE-/-neurons show reduced dendritic complexity, dendritic branch length, and soma size. These defects are due to the reduced PI3K/Akt activities in PIKE-/- neurons, as the impaired dendritic arborization can be rescued when PI3K/Akt cascade is augmented in vitro or in PIKE-/-PTEN-/- double-knock-out mice. Interestingly, PIKE-/- mice display behavioral abnormality in locomotion and spatial navigation. Because of the diminished PI3K/Akt activities, PIKE-/- neurons are more vulnerable to glutamateor stroke-induced neuronal cell death. Together, our data established the critical role of PIKE in regulating neuronal survival and development by substantiating the PI3K/Akt pathway.

Original languageEnglish (US)
Pages (from-to)8083-8092
Number of pages10
JournalJournal of Neuroscience
Volume31
Issue number22
DOIs
StatePublished - Jun 1 2011
Externally publishedYes

ASJC Scopus subject areas

  • Neuroscience(all)

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