Docosahexaenoic acid: A positive modulator of Akt signaling in neuronal survival

Mohammed Akbar, Frances Calderon, Zhiming Wen, Hee Yong Kim

Research output: Contribution to journalArticlepeer-review

354 Scopus citations

Abstract

Phosphatidylinositol 3-kinase [PI (B)K]/Akt signaling is a critical pathway in cell survival. Here, we demonstrate a mechanism where membrane alteration by the n-3 fatty acid status affects Akt signaling, impacting neuronal survival. Docosahexaenoic acid (DHA), an n-3 polyunsaturated fatty acid highly enriched in neuronal membranes, promotes neuronal survival by facilitating membrane translocation activation of Akt through its capacity to increase phosphatidylserine (PS), the major acidic phospholipid in cell membranes. The activation of PI (3)K and phosphatidylsinositol triphosphate formation were not affected by DHA, indicating that membrane interaction of Akt is the event responsible for the DHA effect. Docosapentaenoic acid, which replaces DHA during n-3 fatty acid deficiency, was less effective in accumulating PS and translocating Akt and thus less effective in preventing apoptosis. Consistently, in vivo reduction of DHA by dietary depletion of n-3 fatty acids decreased hippocampal PS and increased neuronal susceptibility to apoptosis in cultures. This mechanism may contribute to neurological deficits associated with n-3 fatty acid deficiency and support protective effects of DHA in pathological models such as brain ischemia or Alzheimer's disease.

Original languageEnglish (US)
Pages (from-to)10858-10863
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume102
Issue number31
DOIs
StatePublished - Aug 2 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General

Keywords

  • Apoptosis
  • Docosapentaenoic acid
  • Hippocampus
  • Phosphatidylserine
  • n-3 fatty acid deficiency

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