title: Depletion of striatal dopamine transporter does not affect psychostimulant-induced locomotor activity.
abstract: The effect of neurotoxin-induced depletion of striatal dopamine transporter (DAT) binding sites on animals' responses to psychostimulants was investigated. Multiple 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) or methamphetamine (METH) injections but not a single METH injection to Swiss Webster mice resulted in > 60% depletion of striatal DAT. MPTP-induced depletion of DAT did not affect METH- and cocaine-stimulated locomotor activity compared with the response of control mice. Pre-exposure to either the neurotoxic or the single non-neurotoxic dose of METH resulted in a marked locomotor sensitization in response to METH or cocaine challenge injections. The present results indicate that > 60% loss in striatal DAT binding sites has no effect on animals' responses to psychostimulants, and suggest that neural systems other than striatal DAT may contribute to the induction of locomotor sensitization to METH and cocaine.
authors.affiliation: Department of Biochemistry, University of Miami School of Medicine, FL 33101, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Itzhak
authors.forename: J L
authors.initials: JL
authors.lastname: Martin
authors.forename: S F
authors.initials: SF
authors.lastname: Ali
authors.forename: M D
authors.initials: MD
authors.lastname: Norenberg
mesh_terms: D015632:1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine / Q000494:pharmacology; D000818:Animals; D002352:Carrier Proteins / Q000502:physiology*; D000697:Central Nervous System Stimulants / Q000494:pharmacology*; D015259:Dopamine Agents / Q000494:pharmacology; D050483:Dopamine Plasma Membrane Transport Proteins; D018765:Dopamine Uptake Inhibitors / Q000378:metabolism; D007700:Kinetics; D008297:Male; D008454:Mazindol / Q000378:metabolism; D008562:Membrane Glycoproteins; D026901:Membrane Transport Proteins; D008694:Methamphetamine / Q000494:pharmacology*; D051379:Mice; D009043:Motor Activity / Q000187:drug effects* / Q000502:physiology*; D017072:Neostriatum / Q000378:metabolism / Q000502:physiology*; D009419:Nerve Tissue Proteins; D011485:Protein Binding
chemical_list: D002352:Carrier Proteins; D000697:Central Nervous System Stimulants; D015259:Dopamine Agents; D050483:Dopamine Plasma Membrane Transport Proteins; D018765:Dopamine Uptake Inhibitors; D008562:Membrane Glycoproteins; D026901:Membrane Transport Proteins; D009419:Nerve Tissue Proteins; C493215:Slc6a3 protein, mouse; D008694:Methamphetamine; D015632:1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine; D008454:Mazindol