Glucose modulation of spreading depression susceptibility.

Published

Journal Article

Spreading depression of Leão is an intense spreading depolarization (SD) wave associated with massive transmembrane ionic, water, and neurotransmitter shifts. Spreading depolarization underlies migraine aura, and occurs in brain injury, making it a potential therapeutic target. While susceptibility to SD can be modulated pharmacologically, much less is known about modulation by systemic physiological factors, such as the glycemic state. In this study, we systematically examined modulation of SD susceptibility by blood glucose in anesthetized rats under full physiological monitoring. Hyperglycemia and hypoglycemia were induced by insulin or dextrose infusion (blood glucose ∼40 and 400 mg/dL, respectively). Spreading depolarizations were evoked by direct cortical electrical stimulation to determine the intensity threshold, or by continuous topical KCl application to determine SD frequency. Hyperglycemia elevated the electrical SD threshold and reduced the frequency of KCl-induced SDs, without significantly affecting other SD properties. In contrast, hypoglycemia significantly prolonged individual and cumulative SD durations, but did not alter the electrical SD threshold, or SD frequency, amplitude or propagation speed. These data show that increased cerebral glucose availability makes the tissue resistant to SD.

Full Text

Duke Authors

Cited Authors

  • Hoffmann, U; Sukhotinsky, I; Eikermann-Haerter, K; Ayata, C

Published Date

  • February 2013

Published In

Volume / Issue

  • 33 / 2

Start / End Page

  • 191 - 195

PubMed ID

  • 22968322

Pubmed Central ID

  • 22968322

Electronic International Standard Serial Number (EISSN)

  • 1559-7016

Digital Object Identifier (DOI)

  • 10.1038/jcbfm.2012.132

Language

  • eng

Conference Location

  • United States