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Cholinergic brain network deficits associated with vestibular sensory conflict deficits in Parkinson’s disease: correlation with postural and gait deficits

  • Neurology and Preclinical Neurological Studies - Original Article
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Abstract

To examine regional cerebral vesicular acetylcholine transporter (VAChT) ligand [18F]fluoroethoxybenzovesamicol ([18F]-FEOBV) PET binding in Parkinson’ disease (PD) patients with and without vestibular sensory conflict deficits (VSCD). To examine associations between VSCD-associated cholinergic brain deficits and postural instability and gait difficulties (PIGD). PD persons (M70/F22; mean age 67.6 ± 7.4 years) completed clinical assessments for imbalance, falls, freezing of gait (FoG), modified Romberg sensory conflict testing, and underwent VAChT PET. Volumes of interest (VOI)-based analyses included detailed thalamic and cerebellar parcellations. VSCD-associated VAChT VOI selection used stepwise logistic regression analysis. Vesicular monoamine transporter type 2 (VMAT2) [11C]dihydrotetrabenazine (DTBZ) PET imaging was available in 54 patients. Analyses of covariance were performed to compare VSCD-associated cholinergic deficits between patients with and without PIGD motor features while accounting for confounders. PET sampling passed acceptance criteria in 73 patients. This data-driven analysis identified cholinergic deficits in five brain VOIs associating with the presence of VSCD: medial geniculate nucleus (MGN) (P < 0.0001), para-hippocampal gyrus (P = 0.0043), inferior nucleus of the pulvinar (P = 0.047), fusiform gyrus (P = 0.035) and the amygdala (P = 0.019). Composite VSCD-associated [18F]FEOBV-binding deficits in these 5 regions were significantly lower in patients with imbalance (− 8.3%, F = 6.5, P = 0.015; total model: F = 5.1, P = 0.0008), falls (− 6.9%, F = 4.9, P = 0.03; total model F = 4.7, P = 0.0015), and FoG (− 14.2%, F = 9.0, P = 0.0043; total model F = 5.8, P = 0.0003), independent of age, duration of disease, gender and nigrostriatal dopaminergic losses. Post hoc analysis using MGN VAChT binding as the single cholinergic VOI demonstrated similar significant associations with imbalance, falls and FoG. VSCD-associated cholinergic network changes localize to distinct structures involved in multi-sensory, in particular vestibular, and multimodal cognitive and motor integration brain regions. Relative clinical effects of VSCD-associated cholinergic network deficits were largest for FoG followed by postural imbalance and falls. The MGN was the most significant region identified.

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Acknowledgements

The authors thank Christine Minderovic, Cyrus Sarosh, the PET technologists, cyclotron operators, and chemists, for their assistance. We are indebted to the subjects who participated in this study.

Funding

This study was funded by National Institutes of Health (R01 AG073100, P01 NS015655, RO1 NS070856, P50 NS091856, P50 NS123067), Department of Veterans Affairs grant (I01 RX001631), the Michael J. Fox Foundation, and the Parkinson’s Foundation. None of the funding agencies had a role in the design and conduct of the study, in the collection, management, analysis and interpretation of the data, in the preparation, review or approval of the manuscript, nor in the decision to submit the manuscript for publication.

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Correspondence to Nicolaas I. Bohnen.

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The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

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Bohnen, N.I., Kanel, P., Roytman, S. et al. Cholinergic brain network deficits associated with vestibular sensory conflict deficits in Parkinson’s disease: correlation with postural and gait deficits. J Neural Transm 129, 1001–1009 (2022). https://doi.org/10.1007/s00702-022-02523-3

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  • DOI: https://doi.org/10.1007/s00702-022-02523-3

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