N-methyl-D-aspartate induces cortical hyperemia through cortical spreading depression-dependent and -independent mechanisms in rats

Laura Lenti, Ferenc Domoki, Tamás Gáspár, James A. Snipes, Ferenc Bari, David W. Busija

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Objective: N-methyl-d-aspartate (NMDA) is a powerful cerebrovascular dilator in vivo. Cortical spreading depression (CSD) has recently been shown to contribute to the pial arteriolar dilation in mice. Our main aim was to examine the participation of CSD in the overall cerebrovascular response to NMDA in the rat. Methods: Anesthetized Wistar rats (eight weeks old) were equipped with a closed cranial window to allow topical application of NMDA (10 ?5-10?3 M) to the parietal cortex. Cortical blood flow (CoBF) under and outside the cranial window was simultaneously monitored by using a two-channel laser-Doppler flowmeter. CSDs were detected by recording the changes in the cortical DC potential. Results: Concentrations of 10 ?4 and 10?3 M of NMDA evoked single CSDs associated with rapid, transient hyperemia, followed by a sustained, but reduced, increase in CoBF. The latency and magnitude of the CoBF responses were dose dependent. The higher dose resulted in shorter latency (100±5* vs. 146±11 seconds, *P<0.05; mean±standard error of the mean) and larger overall flow response (77±12* vs. 28±3% from baseline) under, but not outside, the cranial window. Conclusions: NMDA elicits dose-dependent increases in CoBF that are composed of CSD-dependent and -independent components in rats.

Original languageEnglish
Pages (from-to)929-639
Number of pages291
JournalMicrocirculation
Volume16
Issue number7
DOIs
Publication statusPublished - 2009

Keywords

  • AMPA
  • cerebral blood flow
  • glutamate
  • kainate
  • laser-Doppler flowmetry
  • piglet

ASJC Scopus subject areas

  • Physiology
  • Molecular Biology
  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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