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Assessment of Sensorimotor Function in Mouse Models of Parkinson's Disease
Published on: June 17, 2013
Thalamic cholinergic innervation and postural sensory integration function in Parkinson's disease
Martijn L T M Müller1, Roger L Albin, Vikas Kotagal
11 Department of Radiology, University of Michigan, Ann Arbor, MI, USA.
Brain : a Journal of Neurology
|September 24, 2013
Summary
Postural instability in Parkinson's disease is linked to reduced thalamic cholinergic innervation, not cortical or dopaminergic deficits. This highlights the role of the pedunculopontine nucleus-thalamic pathway in sensory integration for patients with Parkinson's disease.
Area of Science:
- Neuroscience
- Neurology
- Movement Disorders
Background:
- Postural instability is a key symptom in Parkinson's disease (PD), but its underlying pathophysiology is not fully understood.
- Normal balance relies on integrating visual, proprioceptive, and vestibular sensory inputs.
- Degeneration of cholinergic neurons in the brainstem pedunculopontine nucleus (PPN) and their thalamic projections is suspected in PD-related postural deficits.
Purpose of the Study:
- To investigate the association between cholinergic terminal loss in the thalamus and cortex, and dopaminergic denervation in the nigrostriatal pathway, with postural sensory integration deficits in PD.
- To determine the specific contribution of PPN-thalamic cholinergic pathways to postural control in PD patients.
Main Methods:
- Studied 124 PD patients and 25 controls using positron emission tomography (PET) to measure vesicular monoaminergic transporter type 2 (VMAT2) and acetylcholinesterase (AChE) binding.
- Assessed postural control using the sensory organization test (SOT) on a balance platform, measuring center of pressure (COP) sway.
- Employed principal component analysis and regression analysis to correlate neurochemical measures with postural sway factors.
Main Results:
- Factor analysis identified two main postural sway factors explaining 52.2% of the variance.
- Decreased thalamic cholinergic innervation (AChE hydrolysis rate) was significantly associated with increased COP sway speed in PD patients (adjusted R² = 0.123, P = 0.002).
- No significant associations were found between cortical cholinergic deficits, striatal dopaminergic deficits, and postural sway in PD patients.
Conclusions:
- Postural sensory integration in Parkinson's disease is modulated by PPN-thalamic cholinergic pathways, not cortical cholinergic or nigrostriatal dopaminergic pathways.
- Impaired integrity of PPN cholinergic neurons and their thalamic efferents contributes to postural control deficits in PD.
- These findings suggest a specific role for the PPN-thalamic cholinergic system in integrating multimodal sensory information for balance in PD.
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