Acute acidosis elevates malonaldehyde in rat brain in vivo.

Abstract:

:Oxidative stress in brain tissue was measured experimentally in situ using microdialysis to sample the extracellular environment for a lipid peroxidation breakdown product and antioxidants. The extracellular concentrations of the lipid peroxidation product malonaldehyde (MDA) and the antioxidants ascorbic acid (AA) and uric acid (UA) were measured in rat cortex and striatum in vivo using microdialysis coupled to HPLC with UV detection. Tissue acidosis following ischaemia and epileptic seizures may contribute to neuronal damage, which may be mediated by reactive oxygen species. Perfusion of microdialysis probes with acidic artificial cerebrospinal fluid (pH 6) led to a significant increase in the sampled concentration of MDA and the antioxidant ascorbic acid. Simultaneous perfusion of ascorbate (5 mM) with acidic ACSF (pH 6) completely attenuated the rise in lipid peroxidation. This study provides in vivo evidence for acidosis induced oxidative stress in brain tissue and an antioxidant action of ascorbate. The methodology described here can provide direct in vivo information in respect of oxidative stress in experimental situations. The method could equally be applied to the assessment of oxidative stress in a number of pathological models not necessarily confined to the CNS.

journal_name

Brain Res

journal_title

Brain research

authors

Waterfall AH,Singh G,Fry JR,Marsden CA

doi

10.1016/0006-8993(95)01540-x

subject

Has Abstract

pub_date

1996-03-11 00:00:00

pages

102-6

issue

1

eissn

0006-8993

issn

1872-6240

pii

0006-8993(95)01540-X

journal_volume

712

pub_type

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