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Published on: January 7, 2014
Enhanced Hyperthermia Induced by MDMA in Parkin Knockout Mice
Y Takamatsu1, H Shiotsuki, S Kasai
1Division of Psychobiology, Tokyo Institute of Psychiatry, 2-1-8 Kamikitazawa, Setagaya-ku, Tokyo 156-8585, Japan.
Abstract:
MDMA (3,4-methylenedioxymethamphetamine) is reportedly severely toxic to both dopamine (DA) and serotonin neurons. MDMA significantly reduces the number of DA neurons in the substantia nigra, but not in the nucleus accumbens, indicating that MDMA causes selective destruction of DA neurons in the nigrostriatal pathway, sparing the mesolimbic pathway. Parkinson's disease (PD) is a neurodegenerative disorder of multifactorial origin. The pathological hallmark of PD is the degeneration of DA neurons in the nigrostriatal pathway. Mutations in the parkin gene are frequently observed in autosomal recessive parkinsonism in humans. Parkin is hypothesized to protect against neurotoxic insult, and we attempted to clarify the role of parkin in MDMA-induced hyperthermia, one of the causal factors of neuronal damage, using parkin knockout mice. Body temperature was measured rectally before and 15, 30, 45, and 60 min after intraperitoneal injection of MDMA (30 mg/kg) at an ambient temperature of 22 ± 2°C. Significantly enhanced hyper-thermia after MDMA injection was observed in heterozygous and homozygous parkin knockout mice compared with wildtype mice, suggesting that parkin plays a protective role in MDMA neurotoxicity.
Insights
Parkin protein protects against MDMA neurotoxicity. Parkin knockout mice showed increased hyperthermia after MDMA exposure, indicating parkin’s protective role in dopamine neuron damage.
Area of Science:
- Neuroscience
- Toxicology
- Genetics
Background:
- 3,4-methylenedioxymethamphetamine (MDMA) causes severe toxicity to dopamine (DA) and serotonin neurons.
- MDMA selectively destroys DA neurons in the nigrostriatal pathway, a hallmark of Parkinson's disease (PD).
- Parkin gene mutations are linked to autosomal recessive parkinsonism, and parkin is thought to protect against neurotoxic insults.
Purpose of the Study:
- To investigate the role of parkin in MDMA-induced hyperthermia, a factor contributing to neuronal damage.
- To clarify parkin's protective function against MDMA neurotoxicity using parkin knockout mice.
Main Methods:
- Parkin knockout mice (heterozygous and homozygous) and wildtype mice were used.
- Mice were injected intraperitoneally with MDMA (30 mg/kg) at a controlled ambient temperature (22 ± 2°C).
- Rectal body temperature was measured at baseline and at 15, 30, 45, and 60 minutes post-injection.
Main Results:
- Parkin knockout mice exhibited significantly enhanced hyperthermia following MDMA administration compared to wildtype mice.
- This suggests that the absence of functional parkin exacerbates MDMA-induced temperature elevation.
- The findings indicate a correlation between parkin deficiency and increased susceptibility to MDMA's hyperthermic effects.
Conclusions:
- Parkin plays a significant protective role in mitigating MDMA-induced hyperthermia.
- The study supports the hypothesis that parkin confers neuroprotection against MDMA toxicity.
- These findings have implications for understanding the genetic factors influencing susceptibility to neurotoxic drug effects and potentially Parkinson's disease pathogenesis.
