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    Beta amyloid deposition is not associated with cognitive impairment in Parkinson's disease (2019)

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    Beta Amyloid Deposition Is Not Associated With Cognitive Impairment in Parkinsons Disease.pdf (1.284Mb)
    Type of Content
    Journal Article
    UC Permalink
    https://hdl.handle.net/10092/102174
    
    Publisher's DOI/URI
    http://doi.org/10.3389/fneur.2019.00391
    
    Publisher
    Frontiers Media SA
    ISSN
    1664-2295
    Language
    eng
    Collections
    • Science: Journal Articles [1192]
    Authors
    Melzer TR
    Stark MR
    Keenan RJ
    Myall DJ
    MacAskill MR
    Pitcher TL
    Livingston L
    Grenfell S
    Horne KL
    Young BN
    Pascoe MJ
    Almuqbel MM
    Wang J
    Miller DH
    Anderson TJ
    Marsh, Steven cc
    Dalrymple-Alford, John cc
    show all
    Abstract

    The extent to which Alzheimer neuropathology, particularly the accumulation of misfolded beta-amyloid, contributes to cognitive decline and dementia in Parkinson's disease (PD) is unresolved. Here, we used Florbetaben PET imaging to test for any association between cerebral amyloid deposition and cognitive impairment in PD, in a sample enriched for cases with mild cognitive impairment. This cross-sectional study used Movement Disorders Society level II criteria to classify 115 participants with PD as having normal cognition (PDN, n = 23), mild cognitive impairment (PD-MCI, n = 76), or dementia (PDD, n = 16). We acquired 18F-Florbetaben (FBB) amyloid PET and structural MRI. Amyloid deposition was assessed between the three cognitive groups, and also across the whole sample using continuous measures of both global cognitive status and average performance in memory domain tests. Outcomes were cortical FBB uptake, expressed in centiloids and as standardized uptake value ratios (SUVR) using the Centiloid Project whole cerebellum region as a reference, and regional SUVR measurements. FBB binding was higher in PDD, but this difference did not survive adjustment for the older age of the PDD group. We established a suitable centiloid cut-off for amyloid positivity in Parkinson's disease (31.3), but there was no association of FBB binding with global cognitive or memory scores. The failure to find an association between PET amyloid deposition and cognitive impairment in a moderately large sample, particularly given that it was enriched with PD-MCI patients at risk of dementia, suggests that amyloid pathology is not the primary driver of cognitive impairment and dementia in most patients with PD.

    Citation
    Melzer TR, Stark MR, Keenan RJ, Myall DJ, MacAskill MR, Pitcher TL, Livingston L, Grenfell S, Horne KL, Young BN, Pascoe MJ, Almuqbel MM, Wang J, Marsh SH, Miller DH, Dalrymple-Alford JC, Anderson TJ (2019). Beta amyloid deposition is not associated with cognitive impairment in Parkinson's disease. Frontiers in Neurology. 10(APR). 391-.
    This citation is automatically generated and may be unreliable. Use as a guide only.
    Keywords
    Parkinson's disease; amyloid PET; Florbetaben; dementia; centiloid; mild cognitive impairment
    ANZSRC Fields of Research
    32 - Biomedical and clinical sciences::3209 - Neurosciences::320905 - Neurology and neuromuscular diseases
    32 - Biomedical and clinical sciences::3202 - Clinical sciences::320206 - Diagnostic radiography
    52 - Psychology::5202 - Biological psychology::520203 - Cognitive neuroscience
    52 - Psychology::5202 - Biological psychology::520206 - Psychophysiology
    Rights
    Copyright © 2019 Melzer, Stark, Keenan, Myall, MacAskill, Pitcher, Livingston, Grenfell, Horne, Young, Pascoe, Almuqbel, Wang, Marsh, Miller, Dalrymple- Alford and Anderson. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
    http://hdl.handle.net/10092/17651

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    • Beta Amyloid Deposition Is Not Associated With Cognitive Impairment in Parkinson's Disease 

      Melzer TR; Stark MR; Keenan RJ; Myall DJ; MacAskill MR; Pitcher TL; Livingston L; Grenfell S; Horne K-L; Young BN; Pascoe MJ; Almuqbel MM; Wang J; Marsh SH; Miller DH; Dalrymple-Alford JC; Anderson TJ (Frontiers Media SA, 2019)
      The extent to which Alzheimer neuropathology, particularly the accumulation of misfolded beta-amyloid, contributes to cognitive decline and dementia in Parkinson's disease (PD) is unresolved. Here, we used Florbetaben PET ...
    • Changes of plasma cGP/IGF-1 molar ratio with age is associated with cognitive status of Parkinson disease 

      Fan D; MacAskill M; Anderson T; Guan J; Dalrymple-Alford, John; Pitcher, Toni (Wiley, 2020)
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      Almuqbel, M.; Melzer, T.R.; Myall, D.J.; MacAskill, M.R.; Livingston, L.; Wood, K-L.; Pitcher, T.L.; Keenan, R.J.; Dalrymple-Alford, J.C.; Anderson, T.J. (University of Canterbury. Psychology, 2015)
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