Abstract
We examined associations between lipidomic profiles and incident ischemic stroke in the REasons for Geographic and Racial Differences in Stroke (REGARDS) cohort. Plasma lipids (n = 195) were measured from baseline blood samples, and lipids were consolidated into underlying factors using exploratory factor analysis. Cox proportional hazards models were used to test associations between lipid factors and incident stroke, linear regressions to determine associations between dietary intake and lipid factors, and the inverse odds ratio weighting (IORW) approach to test mediation. The study followed participants over a median (IQR) of 7 (3.4–11) years, and the case-cohort substudy included 1075 incident ischemic stroke and 968 non-stroke participants. One lipid factor, enriched for docosahexaenoic acid (DHA, an omega-3 fatty acid), was inversely associated with stroke risk in a base model (HR = 0.84; 95%CI 0.79–0.90; P = 8.33 × 10−8) and fully adjusted model (HR = 0.88; 95%CI 0.83–0.94; P = 2.79 × 10−4). This factor was associated with a healthy diet pattern (β = 0.21; 95%CI 0.12–0.30; P = 2.06 × 10−6), specifically with fish intake (β = 1.96; 95%CI 0.95–2.96; P = 1.36 × 10−4). DHA was a mediator between fish intake and incident ischemic stroke (30% P = 5.78 × 10−3). Taken together, DHA-containing plasma lipids were inversely associated with incident ischemic stroke and mediated the relationship between fish intake and stroke risk.
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Acknowledgements
The authors thank the other investigators, the staff, and the participants of the REGARDS study for their valuable contributions. A full list of participating REGARDS investigators and institutions can be found at: https://www.uab.edu/soph/regardsstudy/.
Funding
This work was supported by the National Institutes of Health (NIH) R01 NS099209 (WTK) and American Heart Association (AHA) 17CSA33550004 (WTK). REGARDS is supported by cooperative agreement U01 NS041588 co-funded by the National Institute of Neurological Disorders and Stroke (NINDS) and the National Institute on Aging (NIA), NIH, Department of Health and Human Service.
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Data acquisition and analysis: ZA and WTK. Statistical analysis: ZA, AP, VMB, MRI, SEJ, and LL. Manuscript draft: ZA and WTK. Critical revision and important intellectual content: RJS, PMR, VMB, NK, ACJ, CC, SJR, SEJ, MC, DLL, and MRI. All authors revised, edited, and approved the final version of the manuscript. MRI and WTK had full access to all the data in the study and took responsibility for the integrity of the data and the accuracy of the data analysis. All authors approved the version to be published.
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DLL received investigator-initiated research support from Amgen, Inc. for work unrelated to this manuscript. All other authors declare that they have no conflicts of interest.
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Ament, Z., Patki, A., Bhave, V.M. et al. Omega-3 Fatty Acids and Risk of Ischemic Stroke in REGARDS. Transl. Stroke Res. (2024). https://doi.org/10.1007/s12975-024-01256-7
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DOI: https://doi.org/10.1007/s12975-024-01256-7