In vivo tau is associated with change in memory and processing speed,

Publication Type	Academic Article
Authors	Simon S, Varangis E, Lee S, Gu Y, Gazes Y, Razlighi Q, Habeck C, Stern Y
Journal	Neurobiol Aging
Volume	133
Pagination	28-38
Date Published	10/06/2023
ISSN	1558-1497
Keywords	Processing Speed, Alzheimer Disease
Abstract	The relationship between tau deposition and cognitive decline in cognitively healthy older adults is still unclear. The tau PET tracer ¹⁸F-MK-6240 has shown favorable imaging characteristics to identify early tau deposition in aging. We evaluated the relationship between in vivo tau levels (¹⁸F-MK-6240) and retrospective cognitive change over 5 years in episodic memory, processing speed, and reasoning. For tau quantification, a set of regions of interest (ROIs) was selected a priori based on previous literature: (1) total-ROI comprising selected areas, (2) medial temporal lobe-ROI, and (3) lateral temporal lobe-ROI and cingulate/parietal lobe-ROI. Higher tau burden in most ROIs was associated with a steeper decline in memory and speed. There were no associations between tau and reasoning change. The novelty of this finding is that tau burden may affect not only episodic memory, a well-established finding but also processing speed. Our finding reinforces the notion that early tau deposition in areas related to Alzheimer's disease is associated with cognitive decline in cognitively unimpaired individuals, even in a sample with low amyloid-β pathology.
DOI	10.1016/j.neurobiolaging.2023.10.001
PubMed ID	38376885
PubMed Central ID	PMC10879688