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Modeling chronic brain exposure to amphetamines using primary rat neuronal cortical cultures
T B Nogueira1, S da Costa Araújo1, F Carvalho1
1REQUIMTE (Rede de Química e Tecnologia), Laboratório de Toxicologia, Departamento de Ciências Biológicas, Faculdade de Farmácia, Universidade do Porto, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal.
Neuroscience
|July 23, 2014
Summary
Chronic exposure to high concentrations of amphetamine-type psychostimulants (ATS) causes neuronal death and mitochondrial dysfunction. Lower concentrations did not show significant toxicity, suggesting a dose-dependent impact on neuronal health.
Area of Science:
- Neuroscience
- Toxicology
- Cell Biology
Background:
- Amphetamine-type psychostimulants (ATS) are widely used for psychiatric disorders but their chronic effects on neurons and brain aging remain unclear.
- Existing neuronal culture models primarily assess acute toxicity, failing to replicate long-term in vivo exposure scenarios.
Purpose of the Study:
- To establish and validate a novel long-term rat cortical culture model for chronic ATS exposure.
- To investigate the impact of chronic amphetamine (AMPH) and MDMA exposure on neuronal survival, mitochondrial function, and senescence.
Main Methods:
- Developed long-term rat cortical cultures (up to 28 days in vitro).
- Applied AMPH and MDMA at various concentrations (0-200 μM) across different culture durations.
- Assessed neuronal death, mitochondrial dysfunction, β-galactosidase activity, glutathione levels, and caspase 3 activity.
Main Results:
- Chronic exposure to ≥100 μM ATS induced significant mitochondrial dysfunction and neuronal death by 28 DIV.
- AMPH was more toxic than MDMA, causing earlier mitochondrial dysfunction and neuronal death in younger cultures (4-8 DIV).
- Low ATS concentrations (≤10 μM) did not induce significant neuronal death or oxidative stress.
Conclusions:
- The developed long-term culture model accurately reflects in vivo chronic ATS exposure.
- Chronic high-dose ATS exposure leads to significant neurotoxicity, primarily through mitochondrial dysfunction.
- The study highlights a critical dose threshold for ATS-induced neurotoxicity, with lower concentrations being relatively safe.
