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- W2067020104 abstract "Several amphetamine analogues are reported to increase striatal glutamate efflux in vivo, whereas other data indicate that glutamate is capable of stimulating the efflux of dopamine (DA) in the striatum via a glutamate receptor-dependent mechanism. Based on these findings, it has been proposed that the ability of glutamate receptor-blocking drugs to antagonize the effects of amphetamine may be explained by their capacity to inhibit DA release induced by glutamate. To examine this possibility further, we investigated in vivo the ability of glutamate antagonists to inhibit DA release induced by either methamphetamine (METH) or 3,4-methylenedioxymethamphetamine (MDMA). Both METH and MDMA increased DA efflux in the rat striatum and, in animals killed 1 week later, induced persistent depletions of DA and serotonin in tissue. Pretreatment with MK-801 or CGS 19755 blocked the neurotoxic effects of METH and MDMA but did not significantly alter striatal DA efflux induced by either stimulant. Infusion of 6-cyano-7-nitro-quinoxaline-2,3-dione into the striatum likewise did not alter METH-induced DA overflow, and none of the glutamatergic antagonists affected the basal release of DA when given alone. The findings suggest that the neuroprotective effects of NMDA antagonists do not involve an inhibition of DA release, nor do the data support the proposal that glutamate tonically stimulates striatal DA efflux in vivo. Whether phasic increases in glutamate content might stimulate DA release, however, remains to be determined." @default.
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- W2067020104 date "2002-11-23" @default.
- W2067020104 modified "2023-10-17" @default.
- W2067020104 title "Effects of Glutamate Antagonists on Methamphetamine and 3,4-Methylenedioxymethamphetamine-Induced Striatal Dopamine Release In Vivo" @default.
- W2067020104 doi "https://doi.org/10.1046/j.1471-4159.1996.66051949.x" @default.
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