Influence of paraquat on dopaminergic transporter in the rat brain.
Journal Title: Pharmacological Reports - Year 2005, Vol 57, Issue 3
Abstract
Selective toxicity of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP),a parkinsonism inducing compound, is well known to be related to an uptake of its active metabolite MPP(+)into dopaminergic neurons by dopamine transporter (DAT). The aim of the present study was to examinewhether paraquat, a commonly used herbicide, which is an 1-methyl-4-phenyl-pyridinium ion (MPP(+)) analogue,affects DAT in vivo in rats. Paraquat administered at a dose of 10 mg/kg ip decreased the binding of[(3)H]GBR 12,935 to DAT measured by quantitative autoradiography in the dorsal and ventral caudate-putamen,but not in the substantia nigra pars compacta. Moreover, this compound increased the level of 3-methoxytyramine(3-MT) and 3-MT/dopamine ratio in the anterior and posterior caudate-putamen measured by HPLC with electrochemicaldetection. No other alterations in the levels of dopamine and its metabolites were found in the caudate-putamenand substantia nigra. The present study seems to suggest that systemic paraquat administration affectsstriatal DAT and dopamine metabolism in the nigrostriatal neurons in rats which may be crucial for itsneurotoxic effects on dopaminergic neurons.
Authors and Affiliations
Krystyna Ossowska, Jadwiga Wardas, Katarzyna Kuter, Przemysław Nowak, Joanna Dąbrowska, Aleksandra Bortel, Łukasz Labus, Aleksander Kwieciński, Anna Krygowska-Wajs, Stanisław Wolfarth
Keywords
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