Abstract
NAD(P)H autofluorescence was used to verify establishment of metabolic anoxia using primary cultures of cortical neurons and astrocytes. Cells on cover slips were placed in a chamber and O2 was displaced by continuous infusion of argon. Perfusion with medium at PO2 < 0.4 mm Hg caused an increase in NAD(P)H fluorescence, albeit to levels lower than that obtained with cyanide. Addition of the nitric oxide-generating agent DETA-NO to the hypoxic medium further increased fluorescence to the level with cyanide. Fluorescence under anoxia remained high in the presence of glucose, but declined in neurons and not in astrocytes when glucose was substituted with 2-deoxyglucose. Reoxygenation of neurons resulted in a decline in fluorescence and a loss in fluorescent gradient between fully reduced and fully oxidized (plus respiratory uncoupler). We conclude that (1) DETA-NO is useful for generating metabolic anoxia in the presence of argon (2) Exogenous glucose is necessary to maintain NAD(P)H in a reduced state during metabolic anoxia in neurons but not astrocytes (3) Neurons undergo a partially irreversible decline in NAD(P)H fluorescence during metabolic anoxia and reoxygenation that could contribute to prolonged metabolic failure.
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These studies were supported by NIH grants NS34152, NS07375 and HD16596.
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Special issue dedicated to John P. Blass.
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Kahraman, S., Fiskum, G. Anoxia-Induced Changes in Pyridine Nucleotide Redox State in Cortical Neurons and Astrocytes. Neurochem Res 32, 799–806 (2007). https://doi.org/10.1007/s11064-006-9206-8
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DOI: https://doi.org/10.1007/s11064-006-9206-8