Abstract
To determine whether the attenuation of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-induced neurotoxicity by tobacco smoke exposure is caused by inhibition of the neuronal uptake of 4-phenylpyridinium ion (MPP +), various tobacco components and a smoke extract were tested for inhibitory activity in striatal synaptosomes. A dimethylsulfoxide extract of tobacco smoke filtrate was found to inhibit the uptake of MPP + and dopamine. These results suggest that inhibition of the neuronal dopamine uptake mechanism may account for the protective effects of smoke exposure on MPTP-induced neurotoxicity.
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