Related Experiment Video
Updated: Aug 9, 2026
08:36
Functional Neuroimaging Using Ultrasonic Blood-brain Barrier Disruption and Manganese-enhanced MRI
Published on: July 12, 2012
The biodisposition of MPP+ in mouse brain
I Irwin1, L E DeLanney, D Di Monte
1Institute for Medical Research, San Jose, CA 95128.
Neuroscience Letters
|June 5, 1989
Summary
This study found that 1-methyl-4-phenylpyridinium (MPP+) is not biotransformed in the mouse central nervous system (CNS). Rapid elimination suggests an active transport system may be involved in MPP+ removal from the brain.
Area of Science:
- Neuroscience
- Pharmacology
- Toxicology
Background:
- 1-methyl-4-phenylpyridinium (MPP+) is a metabolite of MPTP, known for its neurotoxic effects.
- Understanding MPP+ elimination from the central nervous system (CNS) is crucial for neuroprotection strategies.
Purpose of the Study:
- To investigate the role of biotransformation in the elimination of MPP+ from the mouse CNS.
- To elucidate the mechanisms underlying MPP+ clearance from the brain.
Main Methods:
- Mice received MPP+ intracerebroventricularly (i.c.v.) or MPTP intraperitoneally.
- MPP+ elimination kinetics were analyzed over 10 hours.
- Radiolabeled MPP+ ([14C/3H]MPP+) was used for detection.
- Analyses included liquid scintillation counting, HPLC, and GC/MS.
- MPP+ was incubated with brain homogenates.
Main Results:
- MPP+ elimination from the brain followed similar exponential kinetics regardless of administration route (i.c.v. MPP+ or i.p. MPTP).
- No compounds other than MPP+ were detected in brain tissue 2-10 hours post-administration.
- MPP+ remained unchanged after incubation with brain homogenates, indicating no biotransformation.
Conclusions:
- MPP+ is not eliminated from the CNS via biotransformation.
- The rapid clearance and positive charge of MPP+ suggest the involvement of an active transport system for its removal from the brain.
