Biochemical quantification of total brain glycogen concentration in rats under different glycemic states

Florence D. Morgenthaler, Dee M. Koski, Rudolf Kraftsik, Pierre Gilles Henry, Rolf Gruetter

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

All 13C NMR studies of brain glycogen to date relied on observing the incorporation of 13C label into glycogen, and thus interpretation was potentially affected by changes in 13C label turnover rates. The goal of this study was to quantify total brain glycogen concentration under conditions of hypoglycemia or normoglycemia using biochemical methods. Rats were sacrificed using a focused microwave fixation device. The results showed that metabolism of brain glycogen was Glc- and insulin-sensitive and that insulin-induced hypoglycemia promoted a gradual glycogenolysis. Moreover, we show that there are very mild effects of isoflurane and α-chloralose anesthesia on brain glycogen concentration. Altogether these results show that total brain glycogen serves as a substantial source of glucosyl units during insulin-induced moderate hypoglycemia and therefore may be neuroprotective. Finally we also conclude that previous interpretation of 13C NMR spectroscopy data accurately reflected the changes in total brain glycogen content.

Original languageEnglish (US)
Pages (from-to)616-622
Number of pages7
JournalNeurochemistry International
Volume48
Issue number6-7
DOIs
StatePublished - May 2006

Bibliographical note

Funding Information:
We wish to thank Tianwen K. Yue for his help with the animal preparation. This work was supported by NIH R01NS42005 and JDRF 1-2002-722.

Keywords

  • Astrocytes
  • Glucose
  • Glycogen metabolism
  • Hypoglycemia unawareness
  • Magnetic resonance

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