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Simultaneous monitoring of tissue PO2 and NADH fluorescence during synaptic stimulation and spreading depression reveals a transient dissociation between oxygen utilization and mitochondrial redox state in rat hippocampal slices.

Publication ,  Journal Article
Galeffi, F; Somjen, GG; Foster, KA; Turner, DA
Published in: J Cereb Blood Flow Metab
February 2011

Nicotinamide adenine dinucleotide (NADH) imaging can be used to monitor neuronal activation and ascertain mitochondrial dysfunction, for example during hypoxia. During neuronal stimulation in vitro, NADH normally becomes more oxidized, indicating enhanced oxygen utilization. A subsequent NADH overshoot during activation or on recovery remains controversial and reflects either increased metabolic activity or limited oxygen availability. Tissue P(2) measurements, obtained simultaneously with NADH imaging in area CA1 in hippocampal slices, reveal that during prolonged train stimulation (ST) in 95% O(2), a persistent NADH oxidation is coupled with increased metabolic demand and oxygen utilization, for the duration of the stimulation. However, under conditions of either decreased oxygen supply (ST-50% O(2)) or enhanced metabolic demand (K(+)-induced spreading depression (K(+)-SD) 95% O(2)) the NADH oxidation is brief and the redox balance shifts early toward reduction, leading to a prolonged NADH overshoot. Yet, oxygen utilization remains elevated and is correlated with metabolic demand. Under these conditions, it appears that the rate of NAD(+) reduction may transiently exceed oxidation, to maintain an adequate oxygen flux and ATP production. In contrast, during SD in 50% O(2), the oxygen levels dropped to a point at which oxidative metabolism in the electron transport chain is limited and the rate of utilization declined.

Duke Scholars

Published In

J Cereb Blood Flow Metab

DOI

EISSN

1559-7016

Publication Date

February 2011

Volume

31

Issue

2

Start / End Page

626 / 639

Location

United States

Related Subject Headings

  • Synapses
  • Stimulation, Chemical
  • Rats, Inbred F344
  • Rats
  • Potassium Chloride
  • Oxygen Consumption
  • Oxidation-Reduction
  • Neurology & Neurosurgery
  • NAD
  • Mitochondria
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Galeffi, Francesca, George G. Somjen, Kelley A. Foster, and Dennis A. Turner. “Simultaneous monitoring of tissue PO2 and NADH fluorescence during synaptic stimulation and spreading depression reveals a transient dissociation between oxygen utilization and mitochondrial redox state in rat hippocampal slices.J Cereb Blood Flow Metab 31, no. 2 (February 2011): 626–39. https://doi.org/10.1038/jcbfm.2010.136.
Journal cover image

Published In

J Cereb Blood Flow Metab

DOI

EISSN

1559-7016

Publication Date

February 2011

Volume

31

Issue

2

Start / End Page

626 / 639

Location

United States

Related Subject Headings

  • Synapses
  • Stimulation, Chemical
  • Rats, Inbred F344
  • Rats
  • Potassium Chloride
  • Oxygen Consumption
  • Oxidation-Reduction
  • Neurology & Neurosurgery
  • NAD
  • Mitochondria