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This study investigated the response of the antioxidant defense system in brain subcellular fractions after oral graded doses of ethanol to rat. Four groups of male Fischer-344 rats were orally administered saline, ethanol 2 g, 4 g, and 6 g/kg, respectively, and sacrificed 1 hour post treatment. Brain cytosol, synaptosomes, microsomes and mitochondria were separated by density gradient differential centrifugation and assayed for antioxidant system. A significant and dose-dependent-decrease in superoxide dismutase (SOD) activity was observed in all brain subcellular fractions. Catalase (CAT) activity was significantly decreased in brain mitochondria (67% and 80% of control) at higher doses of ethanol; whereas, CAT activity was significantly increased in cytosol, synaptosomes and microsomes. Glutathione peroxidase (GSH-Px) activity was significantly increased in all brain subcellular fractions except in cytosol at higher dose of ethanol. Malondialdehyde (MDA) content was significantly increased in all brain subcellular fractions showing dose response of ethanol-induced oxidative stress. The increase in MDA levels in the brain synaptosomes and microsomes were higher at 6 g dose of ethanol (155% and 163% of control) when compared to mitochondria and cytosol. Glutathione (GSH) levels were significantly increased in brain cytosol and microsomes at higher dose of ethanol (164% and 159% of control); whereas, the GSH concentration was significantly decreased in brain synaptosomes and mitochondria. The antioxidant enzyme (AOE) activity ratios (GSH-Px/SOD and GSH-Px + CAT/SOD) were dose dependently increased in all brain subcellular fractions, particularly in synaptosomes. The GSH/GSSG ratio was dose dependently increased in brain microsomes. The perturbations in the antioxidant defense system and enhanced lipid peroxidation following graded doses of ethanol ingestion indicate a dose-dependent-oxidative 2133stress response in brain subcellular compartments of rats.
S K Reddy, and
K Husain, and
E C Schlorff, and
R B Scott, and
S M Somani
January 1997,
Journal of applied toxicology : JAT,
S K Reddy, and
K Husain, and
E C Schlorff, and
R B Scott, and
S M Somani
March 1987,
Neuroscience letters,
S K Reddy, and
K Husain, and
E C Schlorff, and
R B Scott, and
S M Somani
January 2005,
Journal of biochemical and molecular toxicology,
S K Reddy, and
K Husain, and
E C Schlorff, and
R B Scott, and
S M Somani
January 1998,
Journal of applied toxicology : JAT,
S K Reddy, and
K Husain, and
E C Schlorff, and
R B Scott, and
S M Somani
July 1999,
Pharmacology & toxicology,
S K Reddy, and
K Husain, and
E C Schlorff, and
R B Scott, and
S M Somani
January 1972,
Zhurnal evoliutsionnoi biokhimii i fiziologii,
S K Reddy, and
K Husain, and
E C Schlorff, and
R B Scott, and
S M Somani
May 1987,
Neurochemical research,
S K Reddy, and
K Husain, and
E C Schlorff, and
R B Scott, and
S M Somani
August 1973,
FEBS letters,
S K Reddy, and
K Husain, and
E C Schlorff, and
R B Scott, and
S M Somani
June 1982,
Medical biology,
S K Reddy, and
K Husain, and
E C Schlorff, and
R B Scott, and
S M Somani
January 1999,
Alcohol (Fayetteville, N.Y.),
