Impaired dopamine release and synaptic plasticity in the striatum of Parkin−/− mice
Article first published online: 5 MAY 2009
© 2009 The Authors. Journal Compilation © 2009 International Society for Neurochemistry
Journal of Neurochemistry
Volume 110, Issue 2, pages 613–621, July 2009
How to Cite
Kitada, T., Pisani, A., Karouani, M., Haburcak, M., Martella, G., Tscherter, A., Platania, P., Wu, B., Pothos, E. N. and Shen, J. (2009), Impaired dopamine release and synaptic plasticity in the striatum of Parkin−/− mice. Journal of Neurochemistry, 110: 613–621. doi: 10.1111/j.1471-4159.2009.06152.x
- Issue published online: 25 JUN 2009
- Article first published online: 5 MAY 2009
- Received March 24, 2009; revised manuscript received April 25, 2009; accepted April 30, 2009.
- dopamine transporter;
Parkin is the most common causative gene of juvenile and early-onset familial Parkinson’s diseases and is thought to function as an E3 ubiquitin ligase in the ubiquitin-proteasome system. However, it remains unclear how loss of Parkin protein causes dopaminergic dysfunction and nigral neurodegeneration. To investigate the pathogenic mechanism underlying these mutations, we used parkin−/− mice to study its physiological function in the nigrostriatal circuit. Amperometric recordings showed decreases in evoked dopamine release in acute striatal slices of parkin−/− mice and reductions in the total catecholamine release and quantal size in dissociated chromaffin cells derived from parkin−/− mice. Intracellular recordings of striatal medium spiny neurons revealed impairments of long-term depression and long-term potentiation in parkin−/− mice, whereas long-term potentiation was normal in the Schaeffer collateral pathway of the hippocampus. Levels of dopamine receptors and dopamine transporters were normal in the parkin−/− striatum. These results indicate that Parkin is involved in the regulation of evoked dopamine release and striatal synaptic plasticity in the nigrostriatal pathway, and suggest that impairment in evoked dopamine release may represent a common pathophysiological change in recessive parkinsonism.