The pathophysiological basis underlying the development of parkinsonian motor signs (PMS) and how deep brain stimulation (DBS) works to improve them is unclear. Synchronized oscillations in the beta band have been proposed to play a significant role, but how this activity leads to the development of the motor abnormalities in Parkinson's disease (PD), the potential role of oscillatory activity in other frequency bands and how this affects neuronal activity in the basal ganglia thalamo-cortical circuit (BGTC) are not well understood. In this proposal we will further explore the cortical-subcortical interactions that underlie the development of PMS, how DBS modifies this activity, and compare DBS to L-dopa alone or with DBS by examining the changes in synchronized oscillatory activity, coupling and connectivity changes that occur between cortical and subcortical structures under these different conditions. To better understand the relative effect of stimulation focused into motor versus nonmotor regions of the subthalamic nucleus and internal segment of the globus pallidus on BGTC circuitry and motor signs we will compare the effect of DBS directed into motor versus nonmotor regions using segmented lead technology, explore whether these interactions change with continued DBS and develop novel algorithms for closed loop DBS that include both beta and gamma frequency spectrums and incorporate a novel ?phasic stimulation? approach where stimulation is timed to a specific phase of the oscillation. The nonhuman primate MPTP model of PD will be used and animals will be assessed both at rest, as well as during passive movement and task related activity. This study will provide a greater understanding of the pathophysiological changes that occur in BGTC circuitry in PD, further delineate the mechanisms underlying the therapeutic effects of DBS and L-dopa, and characterize the effect of directional DBS on BGTC circuitry and motor signs, while identifying physiological biomarkers to be used for closed loop algorithms that improve motor signs both at rest and during task related activity where biomarker activity is dynamic and constantly changing.

Public Health Relevance

Millions of people in the U.S. and worldwide have been diagnosed with Parkinson's disease (PD), a progressively debilitating disorder characterized by abnormal movement. Many patients with PD who no longer respond adequately to medications can be treated successfully with an FDA approved therapy known as deep brain stimulation (DBS), however results vary widely among individual patients and much remains unknown about how it works. Results from this study will provide a better understanding of how DBS and medical therapy change brain function to improve movement in patients, and lead to the development of a new DBS strategy that may provide a more continuous and beneficial therapeutic effect than current approaches.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
5R01NS037019-21
Application #
10106676
Study Section
Clinical Neuroscience and Neurodegeneration Study Section (CNN)
Program Officer
Sieber, Beth-Anne
Project Start
1999-07-01
Project End
2024-01-31
Budget Start
2021-02-01
Budget End
2022-01-31
Support Year
21
Fiscal Year
2021
Total Cost
Indirect Cost
Name
University of Minnesota Twin Cities
Department
Neurology
Type
Schools of Medicine
DUNS #
555917996
City
Minneapolis
State
MN
Country
United States
Zip Code
55455
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Escobar Sanabria, David; Johnson, Luke A; Nebeck, Shane D et al. (2017) Parkinsonism and vigilance: alteration in neural oscillatory activity and phase-amplitude coupling in the basal ganglia and motor cortex. J Neurophysiol 118:2654-2669
Muralidharan, Abirami; Zhang, Jianyu; Ghosh, Debabrata et al. (2017) Modulation of Neuronal Activity in the Motor Thalamus during GPi-DBS in the MPTP Nonhuman Primate Model of Parkinson's Disease. Brain Stimul 10:126-138
Johnson, Luke A; Nebeck, Shane D; Muralidharan, Abirami et al. (2016) Closed-Loop Deep Brain Stimulation Effects on Parkinsonian Motor Symptoms in a Non-Human Primate - Is Beta Enough? Brain Stimul 9:892-896
Muralidharan, A; Jensen, A L; Connolly, A et al. (2016) Physiological changes in the pallidum in a progressive model of Parkinson's disease: Are oscillations enough? Exp Neurol 279:187-196
Johnson, Luke A; Xu, Weidong; Baker, Kenneth B et al. (2015) Modulation of motor cortex neuronal activity and motor behavior during subthalamic nucleus stimulation in the normal primate. J Neurophysiol 113:2549-54
Dorval, Alan D; Muralidharan, Abirami; Jensen, Alicia L et al. (2015) Information in pallidal neurons increases with parkinsonian severity. Parkinsonism Relat Disord 21:1355-61
Connolly, Allison T; Muralidharan, Abirami; Hendrix, Claudia et al. (2015) Local field potential recordings in a non-human primate model of Parkinsons disease using the Activa PC + S neurostimulator. J Neural Eng 12:066012
Agnesi, Filippo; Muralidharan, Abirami; Baker, Kenneth B et al. (2015) Fidelity of frequency and phase entrainment of circuit-level spike activity during DBS. J Neurophysiol 114:825-34

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