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[A preliminary study on the mechanism of neurotoxicity of MDMA--oxidative stress harm]
Su-Xia Li1, Ai-Min Sun, Xue Wang
1Center of Psychology Health, West China Hospital, Sichuan University, Chengdu 610041, China.
Objective:
Establishing a long-term neurotoxic model to explore the mechanism of neurotoxicity of 3,4-methylenedioxymethamphetamine (MDMA) and the putative protection conferred by Vit C against oxidative stress harm.
Methods:
Male Wistar rats were randomly assigned to control group (A) and MDMA treatment groups(B, C, D, E). Rats of group B were given MDMA 20 mg/kg; groups C, D, E were given Vit C 250 mg/kg 30 min before administration of MDMA (Vit C 30 min group) and 3 h (Vit C 3 h group) and 5 h (VitC 5 h group) after administration of MDMA, respectively. Rats of control group were treated with the same volume of saline. Concentrations of ATP and ADP in brain cortex and 5-HT in hippocampus and occipital cortex were measured by high perfor-mance liquid chromatography; the expression of SERT mRNA was detected by in situ hybridization; and the expression of protein GFAP was detected by immunohisto-chemistry.
Results:
hours after MDMA treatment, the concentration of ATP in brain cortex was lessened, compared with control (P <0.05). On the 7th day after MDMA treatment, the concentration of 5-HT in rat hippocampus and occipital cortex was decreased, compared with control (P<0.05). The expression of SERT mRNA in hippocampus was decreased, whereas the expression of GFAP in brain tissue was increased (P<0.05). The adminstration of Vit C 30 min before MDMA treatment and 3 h after MDMA treatment did not curb the decrease of ATP, 5-HT and the expression of SERT mRNA, but Vit C administrated 5 h after MDMA treatment could curb the decrease of ATP and the functional markers of 5-HT. And Vit C given at three time points did downregulate the GFAP expression.
Conclusion:
MDMA could deplete the direct energetic substance ATP. MDMA could exert neurotoxic effect on 5-HT system. Vit C given 5 h after MDMA administration could provide neuroprotection for ATP and 5-HT system.
Insights
3,4-methylenedioxymethamphetamine (MDMA) neurotoxicity depletes ATP and 5-HT systems. Vitamin C administered 5 hours after MDMA shows neuroprotective effects on these systems.
Area of Science:
- Neuroscience
- Pharmacology
- Toxicology
Context:
- 3,4-methylenedioxymethamphetamine (MDMA) is known for its psychoactive effects, but its long-term neurotoxic mechanisms and potential protective agents require further investigation.
- Oxidative stress is implicated in MDMA-induced neurotoxicity, making antioxidants like Vitamin C potential therapeutic candidates.
- Establishing reliable animal models is crucial for understanding complex neurotoxic pathways and evaluating interventions.
Purpose:
- To establish a long-term neurotoxic model in rats using MDMA.
- To investigate the neurotoxic mechanisms of MDMA, focusing on ATP, 5-HT system, SERT mRNA, and GFAP expression.
- To evaluate the neuroprotective potential of Vitamin C against MDMA-induced neurotoxicity at different administration timings.
Summary:
- MDMA administration significantly decreased ATP and 5-HT concentrations, reduced SERT mRNA expression, and increased GFAP expression in rat brains.
- Vitamin C administration 5 hours after MDMA exposure partially mitigated the decrease in ATP and 5-HT levels and downregulated GFAP expression.
- Early administration of Vitamin C (30 minutes before or 3 hours after MDMA) did not prevent MDMA-induced neurochemical deficits.
Impact:
- This study elucidates MDMA's neurotoxic effects on energy metabolism and serotonergic systems.
- The findings suggest a critical time window for Vitamin C intervention to offer neuroprotection against MDMA toxicity.
- Provides a foundation for further research into therapeutic strategies for MDMA-induced neurotoxicity.