High incidence of adverse cerebral blood flow responses to spreading depolarization in the aged ischemic rat brain

Ákos Menyhárt, Péter Makra, Borbála E. Szepes, Orsolya M. Tóth, Péter Hertelendy, Ferenc Bari, Eszter Farkas

Research output: Article

23 Citations (Scopus)

Abstract

Spreading depolarizations (SDs) occur spontaneously in the brain after stroke, exacerbate ischemic injury, and thus emerge as a potential target of intervention. Aging predicts worse outcome from stroke; yet, the impact of age on SD evolution is not clear. Cerebral ischemia was induced by bilateral common carotid artery occlusion in young (8-9 weeks old, n = 8) and old (2 year olds, n = 6) anesthetized rats. Sham-operated animals of both age groups served as control (n = 12). Electrocorticogram, direct current potential, and cerebral blood flow (CBF) variations were acquired via a small craniotomy above the parietal cortex. SDs were elicited by KCl through a second craniotomy distal to the recording site. Ischemia and age delayed the recovery from SD. CBF decreased progressively during ischemia in the old animals selectively, and inverse neurovascular coupling with SD evolved in the old but not in the young ischemic group. We propose that (mal)adaptation of cerebrovascular function with aging impairs the SD-related CBF response, which is implicated in the intensified expansion of ischemic damage in the old brain.

Original languageEnglish
Pages (from-to)3269-3277
Number of pages9
JournalNeurobiology of Aging
Volume36
Issue number12
DOIs
Publication statusPublished - dec. 2015

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ASJC Scopus subject areas

  • Neuroscience(all)
  • Ageing
  • Clinical Neurology
  • Developmental Biology
  • Geriatrics and Gerontology

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