Psychiatry - Research Publications

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Author: Ames, David × Author: Ellis, Kathryn × Author: Villemagne, Victor × Author: Rowe, Christopher × Start date: 2020 × End date: 2021 ×

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    Fifteen Years of the Australian Imaging, Biomarkers and Lifestyle (AIBL) Study: Progress and Observations from 2,359 Older Adults Spanning the Spectrum from Cognitive Normality to Alzheimer's Disease
    Fowler, C ; Rainey-Smith, SR ; Bird, S ; Bomke, J ; Bourgeat, P ; Brown, BM ; Burnham, SC ; Bush, A ; Chadunow, C ; Collins, S ; Doecke, J ; Dore, V ; Ellis, KA ; Evered, L ; Fazlollahi, A ; Fripp, J ; Gardener, SL ; Gibson, S ; Grenfell, R ; Harrison, E ; Head, R ; Jin, L ; Kamer, A ; Lamb, F ; Lautenschlager, NT ; Laws, SM ; Li, Q-X ; Lim, L ; Lim, YY ; Louey, A ; Macaulay, SL ; Mackintosh, L ; Martins, RN ; Maruff, P ; Masters, CL ; McBride, S ; Milicic, L ; Peretti, M ; Pertile, K ; Porter, T ; Radler, M ; Rembach, A ; Robertson, J ; Rodrigues, M ; Rowe, CC ; Rumble, R ; Salvado, O ; Savage, G ; Silbert, B ; Soh, M ; Sohrabi, HR ; Taddei, K ; Taddei, T ; Thai, C ; Trounson, B ; Tyrrell, R ; Vacher, M ; Varghese, S ; Villemagne, VL ; Weinborn, M ; Woodward, M ; Xia, Y ; Ames, D (IOS PRESS, 2021)
    BACKGROUND: The Australian Imaging, Biomarkers and Lifestyle (AIBL) Study commenced in 2006 as a prospective study of 1,112 individuals (768 cognitively normal (CN), 133 with mild cognitive impairment (MCI), and 211 with Alzheimer's disease dementia (AD)) as an 'Inception cohort' who underwent detailed ssessments every 18 months. Over the past decade, an additional 1247 subjects have been added as an 'Enrichment cohort' (as of 10 April 2019). OBJECTIVE: Here we provide an overview of these Inception and Enrichment cohorts of more than 8,500 person-years of investigation. METHODS: Participants underwent reassessment every 18 months including comprehensive cognitive testing, neuroimaging (magnetic resonance imaging, MRI; positron emission tomography, PET), biofluid biomarkers and lifestyle evaluations. RESULTS: AIBL has made major contributions to the understanding of the natural history of AD, with cognitive and biological definitions of its three major stages: preclinical, prodromal and clinical. Early deployment of Aβ-amyloid and tau molecular PET imaging and the development of more sensitive and specific blood tests have facilitated the assessment of genetic and environmental factors which affect age at onset and rates of progression. CONCLUSION: This fifteen-year study provides a large database of highly characterized individuals with longitudinal cognitive, imaging and lifestyle data and biofluid collections, to aid in the development of interventions to delay onset, prevent or treat AD. Harmonization with similar large longitudinal cohort studies is underway to further these aims.
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    Baseline White Matter Is Associated With Physical Fitness Change in Preclinical Alzheimer's Disease
    Venkatraman, VK ; Steward, CE ; Cox, KL ; Ellis, KA ; Phal, PM ; Sharman, MJ ; Villemagne, VL ; Lai, MMY ; Cyarto, E ; Ames, D ; Szoeke, C ; Rowe, CC ; Masters, CL ; Lautenschlager, NT ; Desmond, PM (FRONTIERS MEDIA SA, 2020-04-29)
    White matter (WM) microstructure is a sensitive marker to distinguish individuals at risk of Alzheimer's disease. The association of objective physical fitness (PF) measures and WM microstructure has not been explored and mixed results reported with physical activity (PA). Longitudinal studies of WM with PA and PF measures have had limited investigation. This study explored the relationship between objective PF measures over 24-months with "normal-appearing" WM microstructure. Data acquired on magnetic resonance imaging was used to measure "normal-appearing" WM microstructure at baseline and 24-months. Clinical variables such as cognitive and blood-based measures were collected longitudinally. Also, as part of the randomized controlled trial of a PA, extensive measures of PA and fitness were obtained over the 24 months. Bilateral corticospinal tracts (CST) and the corpus callosum showed a significant association between PF performance over 24-months and baseline WM microstructural measures. There was no significant longitudinal effect of the intervention or PF performance over 24-months. Baseline WM microstructural measures were significantly associated with PF performance over 24-months in this cohort of participants with vascular risk factors and at risk of Alzheimer's disease with distinctive patterns for each PF test.