Impaired verbal episodic memory in healthy older adults is marked by increased F<inf>2</inf>-Isoprostanes
Prostaglandins Leukotrienes and Essential Fatty Acids
© 2018 Elsevier Ltd. All rights reserved.
Reason for embargo
Under embargo until 4 February 2019 in compliance with publisher policy.
Age-associated cognitive decline amongst otherwise healthy older individuals is a multifaceted characteristic of ageing. The role of oxidative stress biomarkers has been increasingly examined in the context of pathological aging conditions that affect cognition. Plasma F 2 -Isoprostane levels are a reliable index of systemic oxidative stress (specifically lipid peroxidation) and are elevated in dementia patients. Less is known about their role in healthy cognitive ageing. This study evaluated the relationship between F 2 -Isoprostanes and cognitive functioning in a cohort of 211 healthy elderly adults (60–75 years: Male; 88, Female; 123). Cognitive assessment included the Cognitive Drug Research (CDR) computerised assessment battery, which produces five validated factor scores (corresponding to ‘Quality of Episodic Memory’, ‘Speed of Memory’, Quality of Working Memory’, Power of Attention’ and ‘Continuity of Attention’). Participants with higher F 2 -Isoprostane levels had significantly lower Quality of Episodic Memory scores (suggesting inferior abilities in retaining and retrieving verbal information in episodic memory). This is, to our knowledge, the first report of compromised verbal episodic memory in healthy ageing humans being linked to increased levels of F 2 -Isoprostanes. These results have relevance for interventions aimed at improving cognitive performance in the healthy elderly.
The study is funded by an Australian Research Council Discovery grant to Stough, Scholey and Croft, with additional funding from Horphag, Soho Flordis International-Research and Blackmores. The study was also supported by philanthropic grants from Doug Mitchell and Roderic O`Connor. Downey is supported by an NHMRC Career Development Fellowship (APP1122577). Simpson and Nolidin are recipients of an Australian Government Postgraduate research Scholarship.
This is the author accepted manuscript. The final version is available from Elsevier via the DOI in this record.
Vol. 129, pp. 32 - 37