The subthalamic nucleus plays a critical role in controlling the output of the basal gang!ia. An increased activity of subthalarnic neurons is a key feature of the dopamine-depleted state, and inactivation of these neurons following surgical intervention is effective in alleviating akinesia in Parkinson's disease patients. It is therefore important to understand l) the factors regulating the activity of these neurons under normal conditions, 2) how modification of these mechanisms induced by loss of dopamine cells in the substantia nigra produces an increase in their activity, and 3) if these changes are reversed by established and experimental treatments for Parkinson's disease. In this way it should be possible to develop new pharmacological approaches to therapy which target these neurons. We hypothesize that dopamine depletion induces long-term changes in the response of subthalarnic neurons to glutamatergic, GABAergic and dopaninergic receptor activation. Subthalamic neurons themselves utilize glutamate as a transmitter. Two major targets of these neurons are the substantia nigra zona reticulata and the external pallidum. We will use glutamate release in these structures, measured by microdialysis in conscious animals, as a functional measure of the activity of subthalamic neurons in control and dopamine-depleted states, and in dopamine-depleted animals undergoing one of three treatments: l) chronic L-DOPA administration 2) deep brain stimulation of the subthalamic nucleus 3) chronic implantation of GABA-producing cells in the subthalamic nucleus. The substantia nigra and globus pallidus glutamate release response to activation of glutamate, GABA and dopamine receptors in the subthalamic nucleus will be compared in these different groups of animals. Behavioral analyses will be carried out concomitant with these neurochemical measurements, focusing on measures of orofacial dyskinesia. These in vivo studies will therefore directly interface with the molecular studies of Project l and with the in vitro electrophysiological approach of project 2.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Specialized Center (P50)
Project #
1P50NS038367-01A1
Application #
6254648
Study Section
Special Emphasis Panel (ZNS1-SRB-K (01))
Project Start
1999-09-30
Project End
2004-07-31
Budget Start
Budget End
Support Year
1
Fiscal Year
1999
Total Cost
Indirect Cost
Name
University of California Los Angeles
Department
Type
DUNS #
119132785
City
Los Angeles
State
CA
Country
United States
Zip Code
90095
Kusters, Cynthia D J; Paul, Kimberly C; Guella, Ilaria et al. (2018) Dopamine receptors and BDNF-haplotypes predict dyskinesia in Parkinson's disease. Parkinsonism Relat Disord 47:39-44
Chen, Honglei; Ritz, Beate (2018) The Search for Environmental Causes of Parkinson's Disease: Moving Forward. J Parkinsons Dis 8:S9-S17
Richter, Franziska; Subramaniam, Sudhakar R; Magen, Iddo et al. (2017) A Molecular Tweezer Ameliorates Motor Deficits in Mice Overexpressing ?-Synuclein. Neurotherapeutics 14:1107-1119
Mata, Ignacio F; Johnson, Catherine O; Leverenz, James B et al. (2017) Large-scale exploratory genetic analysis of cognitive impairment in Parkinson's disease. Neurobiol Aging 56:211.e1-211.e7
Paul, Kimberly C; Sinsheimer, Janet S; Cockburn, Myles et al. (2017) Organophosphate pesticides and PON1 L55M in Parkinson's disease progression. Environ Int 107:75-81
Mata, Ignacio F; Leverenz, James B; Weintraub, Daniel et al. (2016) GBA Variants are associated with a distinct pattern of cognitive deficits in Parkinson's disease. Mov Disord 31:95-102
Paul, Kimberly C; Rausch, Rebecca; Creek, Michelle M et al. (2016) APOE, MAPT, and COMT and Parkinson's Disease Susceptibility and Cognitive Symptom Progression. J Parkinsons Dis 6:349-59
Paul, Kimberly C; Sinsheimer, Janet S; Rhodes, Shannon L et al. (2016) Organophosphate Pesticide Exposures, Nitric Oxide Synthase Gene Variants, and Gene-Pesticide Interactions in a Case-Control Study of Parkinson's Disease, California (USA). Environ Health Perspect 124:570-7
Kannarkat, G T; Cook, D A; Lee, J-K et al. (2015) Common Genetic Variant Association with Altered HLA Expression, Synergy with Pyrethroid Exposure, and Risk for Parkinson's Disease: An Observational and Case-Control Study. NPJ Parkinsons Dis 1:
Lee, P C; Bordelon, Y; Bronstein, J et al. (2015) Head injury, ?-synuclein genetic variability and Parkinson's disease. Eur J Neurol 22:874-8

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