Ascorbic acid antagonizes ethanol-induced locomotor activity in the open-field

Area of Science:

• Neuroscience
• Pharmacology
• Behavioral Science

Background:

• Ascorbic acid (AA) is known to antagonize dopamine (DA) effects, reducing activity from dopaminergic drugs and enhancing antidopaminergic agents.
• Ethanol, a widely used substance, triggers dopamine release in the mesolimbic pathway and can increase locomotor activity, indicating a potential dopamine-dependent mechanism.

Purpose of the Study:

• To investigate the effect of acute ascorbic acid administration on ethanol-induced locomotor behavior in mice.
• To determine if AA can attenuate the locomotor-stimulating effects of ethanol.

Main Methods:

• Mice were administered varying doses of ascorbic acid (AA) intraperitoneally at different time intervals before receiving intraperitoneal injections of ethanol.
• Locomotor activity was quantified using open-field chambers.
• The study also examined AA's effects on locomotor activity induced by d-amphetamine and methanol.

Main Results:

• Ascorbic acid (350 and 1400 mg/kg) significantly reduced ethanol-induced locomotor activity when administered 30 minutes prior to ethanol.
• This inhibitory effect was diminished when ethanol was given 90 minutes after AA.
• AA also demonstrated a reduction in locomotor activity induced by d-amphetamine and methanol.

Conclusions:

• The findings support the hypothesis that ethanol has pro-dopaminergic actions contributing to locomotor activity.
• Results suggest a common dopaminergic pathway underlying the locomotor-stimulating effects of ethanol and other drugs of abuse.
• Ascorbic acid may modulate the behavioral effects of substances acting through the dopamine system.