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A single methamphetamine administration rapidly decreases vesicular dopamine uptake
Jeffrey M Brown1, Evan L Riddle, Verónica Sandoval
1Department of Pharmacology and Toxicology, University of Utah, 30 South 2000 East, Salt Lake City, UT 84112, USA.
Summary
Methamphetamine (METH) rapidly decreases dopamine (DA) uptake into synaptic vesicles, unlike cocaine or quinpirole. This effect is modulated by D(2) dopamine receptors, highlighting complex psychostimulant actions.
Area of Science:
- Neuroscience
- Pharmacology
- Dopamine Neurotransmission
Background:
- Previous research indicates psychostimulants like cocaine and quinpirole rapidly alter vesicular dopamine (DA) uptake in rat striata.
- Cocaine's effect on DA uptake is mediated by D(2) dopamine receptors, suggesting receptor involvement in psychostimulant-induced changes.
Purpose of the Study:
- To investigate the impact of methamphetamine (METH), a different psychostimulant, on vesicular DA uptake.
- To elucidate the role of D(1) and D(2) dopamine receptors in mediating METH's effects on vesicular DA transport.
Main Methods:
- Administration of METH to rats and subsequent purification of striatal synaptic vesicles.
- Measurement of vesicular DA uptake following METH treatment, with and without D(1) (SCH23390) or D(2) (eticlopride) receptor antagonist pretreatment.
- Assessment of core body temperature to rule out its influence on METH's effects.
Main Results:
- METH administration rapidly and reversibly decreased vesicular DA uptake.
- The METH-induced decrease in DA uptake was attenuated by the D(2) antagonist eticlopride but not the D(1) antagonist SCH23390.
- Concurrent METH treatment blocked the DA uptake-increasing effects of quinpirole and cocaine, and core body temperature did not affect METH's impact.
Conclusions:
- Psychostimulants can rapidly and differentially modulate vesicular DA uptake.
- D(2) dopamine receptors play a complex role in regulating vesicular DA transport in response to psychostimulants like METH.