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Involvement of Glutamate Neurotransmission in the Development of Excessive Wheel Running in Lewis Rats

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Abstract

Physical activities such as long-distance running can form a habit and might be related to drug-induced addictive behaviors. We investigated possible modulations of N-methyl-d-aspartate (NMDA) receptor subunits during voluntary wheel running in brain regions implicated in reward and addiction. It was observed that Lewis rats progressively increased their amount of daily running, reaching maximum levels of 4–6 km/day. After 3 weeks of running, mRNA levels coding for NR2A and NR2B subunits were increased in the ventral tegmental area, while only NR2A mRNA levels were found to be elevated in the frontal cortex. Long-term wheel running was also associated with increased binding of specific NMDA receptor antagonist [3H]CGP39653 in the frontal cortex. Moreover, pharmacological inhibition of glutamate release by repeated administration of phenytoin (20 mg/kg IP for 21 days) significantly suppressed daily running. These results suggest that glutamatergic neurotransmission might be related to neurobiological mechanisms underlying the compulsive character of voluntary wheel running.

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Schwendt, M., Duncko, R., Makatsori, A. et al. Involvement of Glutamate Neurotransmission in the Development of Excessive Wheel Running in Lewis Rats. Neurochem Res 28, 653–657 (2003). https://doi.org/10.1023/A:1022854213991

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  • DOI: https://doi.org/10.1023/A:1022854213991

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