Decay Accelerating Factor (CD55) Protects Neuronal Cells from Chemical Hypoxia-induced Injury

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Decay Accelerating Factor (CD55) Protects Neuronal Cells from Chemical Hypoxia-induced Injury

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dc.contributor.author Li, Yansong
dc.contributor.author Dalle Lucca, Shawn L
dc.contributor.author Simovic, Milomir
dc.contributor.author Dalle Lucca, Jurandir J
dc.contributor.author Tsokos, George C.
dc.contributor.author Wang, Ying
dc.date.accessioned 2011-11-09T16:41:55Z
dc.date.issued 2010
dc.identifier.citation Wang, Ying, Yansong Li, Shawn L. Dalle Lucca, Milomir Simovic, George C. Tsokos, and Jurandir J. Dalle Lucca. 2010. Decay accelerating factor (CD55) protects neuronal cells from chemical hypoxia-induced injury. Journal of Neuroinflammation 7: 24. en_US
dc.identifier.issn 1742-2094 en_US
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:5343415
dc.description.abstract Background: Activated complement system is known to mediate neuroinflammation and neurodegeneration following exposure to hypoxic-ischemic insults. Therefore, inhibition of the complement activation cascade may represent a potential therapeutic strategy for the management of ischemic brain injury. Decay-accelerating factor (DAF, also known as CD55) inhibits complement activation by suppressing the function of C3/C5 convertases, thereby limiting local generation or deposition of C3a/C5a and membrane attack complex (MAC or C5b-9) production. The present study investigates the ability of DAF to protect primary cultured neuronal cells subjected to sodium cyanide (NaCN)-induced hypoxia from degeneration and apoptosis. Methods: Cultured primary cortical neurons from embryonic Sprague-Dawley rats were assigned one of four groups: control, DAF treatment alone, hypoxic, or hypoxic treated with DAF. Hypoxic cultures were exposed to NaCN for 1 hour, rinsed, followed by 24 hour exposure to 200 ng/ml of recombinant human DAF in normal medium. Human DAF was used in the present study and it has been shown to effectively regulate complement activation in rats. Neuronal cell function, morphology and viability were investigated by measuring plateau depolarization potential, counting the number dendritic spines, and observing TUNEL and MTT assays. Complement C3, C3a, C3a receptor (R) production, C3a-C3aR interaction and MAC formation were assessed along with the generation of activated caspase-9, activated caspase-3, and activated Src. Results: When compared to controls, hypoxic cells had fewer dendritic spines, reduced plateau depolarization accompanied by increased apoptotic activity and accumulation of MAC, as well as up-regulation of C3, C3a and C3aR, enhancement of C3a-C3aR engagement, and elevated caspase and Src activity. Treatment of hypoxic cells with 200 ng/ml of recombinant human DAF resulted in attenuation of neuronal apoptosis and exerted significant protection against neuronal dendritic spine loss and plateau depolarization reduction. Furthermore, treatment with DAF resulted in decreased accumulation of C3a, MAC, C3a-C3aR interaction, caspase-9, activated caspase-3, and pTyr416-Src (activated Src) tyrosine kinase. Conclusion: DAF was found to reduce neuronal cell death and apoptosis in NaCN induced hypoxia. This effect is attributed to the ability of DAF to limit complement activation and inhibit the activity of Src and caspases 9 and 3. This study supports the inhibiting of complement as a neuroprotective strategy against CNS ischemia/reperfusion injury. en_US
dc.language.iso en_US en_US
dc.publisher BioMed Central en_US
dc.relation.isversionof doi://10.1186/1742-2094-7-24 en_US
dc.relation.hasversion http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2867804/pdf/ en_US
dash.license LAA
dc.title Decay Accelerating Factor (CD55) Protects Neuronal Cells from Chemical Hypoxia-induced Injury en_US
dc.type Journal Article en_US
dc.description.version Version of Record en_US
dc.relation.journal Journal of Neuroinflammation en_US
dash.depositing.author Tsokos, George C.
dc.date.available 2011-11-09T16:41:55Z
dash.affiliation.other HMS^Medicine- Beth Israel-Deaconess en_US

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