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Dose concentration and spatial memory and brain mitochondrial function association after
G Taghizadeh1, H Mehdizadeh2, H Lavasani3
1Rehabilitation Research Center, Department of Occupational Therapy, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran.
Archives of Toxicology
|February 19, 2020
Summary
MDMA impairs spatial memory and brain mitochondrial function in rats. These impairments correlate with MDMA and its metabolite MDA levels in the brain and bodily fluids.
Area of Science:
- Neuroscience
- Pharmacology
- Toxicology
Background:
- MDMA (3,4-methylenedioxymethamphetamine) use is linked to memory deficits.
- The relationship between MDMA, its metabolite MDA, spatial memory, and brain mitochondrial function remains understudied in animal models.
Purpose of the Study:
- To investigate the dose-dependent effects of MDMA on spatial memory and brain mitochondrial function in rats.
- To determine the correlation between MDMA and MDA concentrations in plasma, CSF, and brain with observed impairments.
Main Methods:
- Rats received varying intraperitoneal doses of MDMA (0.5-15 mg/kg).
- Spatial memory was assessed using the Morris water maze (MWM) test.
- Brain mitochondrial function was evaluated through measures of reactive oxygen species, membrane potential, swelling, outer membrane damage, cytochrome c release, and ADP/ATP ratio.
Main Results:
- MDMA exhibited nonlinear kinetics and dose-dependent accumulation in brain tissue.
- Spatial memory and mitochondrial function were impaired in a manner correlated with MDMA and MDA concentrations.
- No significant correlation was found between MDMA doses and the MDA/MDMA ratio.
Conclusions:
- MDMA administration leads to dose-dependent spatial memory deficits and compromised brain mitochondrial function in rats.
- Both MDMA and its metabolite MDA contribute to these neurotoxic effects.
- Findings suggest a direct link between MDMA/MDA levels and cognitive/mitochondrial dysfunction.
