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Protection of Neuroblastoma Neuro2A Cells from Hypoxia-Induced Apoptosis by Cyclic Phosphatidic Acid (cPA)

Authors
Journal
PLoS ONE
1932-6203
Publisher
Public Library of Science
Publication Date
Volume
7
Issue
12
Identifiers
DOI: 10.1371/journal.pone.0051093
Keywords
  • Research Article
  • Biology
  • Biochemistry
  • Lipids
  • Lipid Mediators
  • Neurochemistry
  • Neurochemicals
  • Molecular Cell Biology
  • Signal Transduction
  • Signaling Cascades
  • Apoptotic Signaling Cascade
  • Signaling In Cellular Processes
  • Apoptotic Signaling
  • Cell Death
  • Cellular Stress Responses
  • Neuroscience
  • Molecular Neuroscience
  • Signaling Pathways
Disciplines
  • Biology

Abstract

Cyclic phosphatidic acid (cPA) is a naturally occurring phospholipid mediator with a unique cyclic phosphate ring at the sn-2 and sn-3 positions of its glycerol backbone. We have previously shown that cPA significantly suppresses ischemia-induced delayed neuronal death and the accumulation of glial fibrillary acidic protein in the CA1 region of the rat hippocampus. These results indicated that the systemic administration of cPA can protect hippocampal neurons against ischemia-induced delayed neuronal cell death. In the current study, we investigated the effects of cPA on neuronal cell death caused by hypoxia in vitro and the molecular mechanisms underlying these effects. We used cobalt chloride (CoCl2) to expose cells to hypoxic conditions in vitro. Treating mouse neuroblastoma (Neuro2A) cells with CoCl2 induced nuclear DNA condensation and phosphatidylserine exposure. However, adding cPA led to the suppression of CoCl2-induced apoptosis in a cPA dose-dependent manner and attenuated the increase in the Bax/Bcl-2 ratio caused by CoCl2. Quantitative PCR analysis showed that Neuro2A cells strongly express the LPA1, LPA2, and LPA6, which are G-protein coupled receptors that can be activated by cPA. To date, LPA1 and LPA2 have been reported to exhibit antiapoptotic activity. Therefore, to assess the roles of LPA1 and LPA2 on cPA-induced neuroprotective functions, Ki16425, a selective LPA1 and LPA3 antagonist, was adopted to know the LPA1 function and siRNA was used to knockdown the expression of LPA2. On the basis of our results, we propose that cPA-induced protection of Neuro2A cells from CoCl2-induced hypoxia damage is mediated via LPA2.

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