Assessing THK523 selectivity for tau deposits in Alzheimer's disease and non-Alzheimer's disease tauopathies

Michelle T. Fodero-Tavoletti, Shozo Furumoto, Leanne Taylor, Catriona A. McLean, Rachel S. Mulligan, Ian Birchall, Ryuichi Harada, Colin L. Masters, Kazuhiko Yanai, Yukitsuka Kudo, Christopher C. Rowe, Nobuyuki Okamura, Victor L. Villemagne

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57 Citations (Scopus)

Abstract

Introduction: The introduction of tau imaging agents such as 18F-THK523 offers new hope for the in vivo assessment of tau deposition in tauopathies such as Alzheimer's disease (AD), where preliminary 18F-THK523-PET studies have demonstrated significantly higher cortical retention of 18F-THK523 in AD compared to age-matched healthy individuals. In addition to AD, tau imaging with PET may also be of value in assessing non-AD tauopathies, such as corticobasal degeneration (CBD), progressive supranuclear palsy (PSP) and Pick's disease (PiD). Methods: To further investigate the ability of THK523 to recognize tau lesions, we undertook immunohistochemical and fluorescence studies in serial brain sections taken from individuals with AD (n = 3), CBD (n = 2), PSP (n = 1), PiD (n = 2) and Parkinson's disease (PD; n = 2). In addition to the neuropathological analysis, one PSP patient had undergone a 18F-THK523 PET scan 5 months before death. Results: Although THK523 labelled tau-containing lesions such as neurofibrillary tangles and neuropil threads in the hippocampus and frontal regions of AD brains, it failed to label tau-containing lesions in non-AD tauopathies. Furthermore, though THK523 faintly labelled dense-cored amyloid-β plaques in the AD frontal cortex, it failed to label α-synuclein-containing Lewy bodies in PD brain sections. Conclusion: The results of this study suggest that 18F-THK523 selectively binds to paired helical filament tau in AD brains but does not bind to tau lesions in non-AD tauopathies, or to α-synuclein in PD brains.

Original languageEnglish
Article number11
JournalAlzheimer's Research and Therapy
Volume6
Issue number1
DOIs
Publication statusPublished - 2014 Jan 1

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology
  • Cognitive Neuroscience

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    Fodero-Tavoletti, M. T., Furumoto, S., Taylor, L., McLean, C. A., Mulligan, R. S., Birchall, I., Harada, R., Masters, C. L., Yanai, K., Kudo, Y., Rowe, C. C., Okamura, N., & Villemagne, V. L. (2014). Assessing THK523 selectivity for tau deposits in Alzheimer's disease and non-Alzheimer's disease tauopathies. Alzheimer's Research and Therapy, 6(1), [11]. https://doi.org/10.1186/alzrt240