Brain energetics and tolerance to anoxia in deep hypothermia

Radoslav K. Andjus, Željko Džakula, John L. Markley, Slobodan Macura

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

The remarkable time-resolution enhancement by deep lethargic hypothermia (15°C rectal temperature, "cold narcosis," "anesthesia by internal cold") of metabolic events in the rat brain after oxygen deprivation has been exploited to monitor metabolic changes by in vivo 31P-NMR. A correlation was established between the bioenergetic status of the brain and physiological descriptors of tolerance (survival and revival times) determined in parallel experiments with large series of animals. Spectral peak integrals were transformed into absolute concentrations by comparison to biochemically determined time series of data obtained in freeze-trapping experiments conducted under identical conditions. Serial spectra were used to reconstruct the time-course kinetics of intracellular brain pH and of concentration changes of inorganic phosphate, phosphocreatine, ATP, and ADP. Both the biochemical and NMR time series of data were simultaneously fitted by a set of exponential kinetic equations accounting for relationships imposed by the Lohmann and adenylate kinase reactions. Depletion profiles were then computed for a number of descriptors of brain energy status (energy charge, phosphorylation potential, total adenylate, and primary energy stores expressed as the sum of high-energy phosphate-bond equivalents). The results contribute to the understanding of the role of brain energetics in tolerance to oxygen deprivation.

Original languageEnglish (US)
Pages (from-to)10-35
Number of pages26
JournalAnnals of the New York Academy of Sciences
Volume1048
DOIs
StatePublished - Jan 1 2005

Keywords

  • Anoxia
  • Bioenergetics
  • Brain energetics
  • Hypothermia
  • In vivo NMR

ASJC Scopus subject areas

  • Neuroscience(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • History and Philosophy of Science

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