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Neuropathological Changes in Dementia With Lewy Bodies and the Cingulate Island Sign

Lookup NU author(s): Lina Patterson, Dr Michael Firbank, Dr Sean Colloby, Professor Johannes Attems, Professor Alan Thomas, Dr Christopher Morris

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

The cingulate island sign (CIS) refers to the relative sparing of metabolism in the posterior cingulate cortex (PCC) and represents an important biomarker in distinguishing dementia with Lewy bodies (DLB) from Alzheimer disease (AD). The underlying basis of the CIS is unknown; therefore, our aim was to investigate which neurodegenerative changes underpin the formation of CIS. Using quantitative neuropathology, α-synuclein, phosphorylated Tau, and amyloid-β pathology was assessed in 12 DLB, 9 AD and 6 age-matched control patients in the anterior cingulate (ACC), midcingulate, PCC, precuneus/cuneus and parahippocampal gyrus. All participants had undergone 99mTc-hexamethylpropyleneamine oxime (HMPAO) single-photon emission computed tomography imaging during life to define the presence or absence of CIS. In the DLB group, no significant correlations were observed between CIS ratios and neurodegenerative pathology in PCC. In DLB, however, the ACC showed lower HMPAO uptake, as well as significantly higher α-synuclein and amyloid-β burden compared with PCC, possibly underlying the relative preservation of perfusion in PCC when compared with ACC. Our findings suggest that neurodegenerative pathology does not directly correlate with the CIS in DLB, and other metabolic or pathological changes are therefore more likely to be relevant for the development of the CIS.


Publication metadata

Author(s): Patterson L, Firbank MJ, Colloby SJ, Attems J, Thomas AJ, Morris CM

Publication type: Article

Publication status: Published

Journal: Journal of Neuropathology and Experimental Neurology

Year: 2019

Volume: 78

Issue: 8

Pages: 717–724

Print publication date: 01/08/2019

Online publication date: 24/05/2019

Acceptance date: 17/05/2019

Date deposited: 02/08/2019

ISSN (print): 0022-3069

ISSN (electronic): 1554-6578

Publisher: Oxford University Press

URL: https://doi.org/10.1093/jnen/nlz047

DOI: 10.1093/jnen/nlz047


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