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Published in: Nutrition Journal 1/2020

Open Access 01-12-2020 | Stroke | Research

Roles for circulating polyunsaturated fatty acids in ischemic stroke and modifiable factors: a Mendelian randomization study

Authors: Tonghui Yuan, Shucheng Si, Yunxia Li, Wenchao Li, Xiaolu Chen, Congcong Liu, Jiqing Li, Bojie Wang, Lei Hou, Yanxun Liu, Fuzhong Xue

Published in: Nutrition Journal | Issue 1/2020

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Abstract

Background

Available data about the effects of circulating polyunsaturated fatty acids (PUFAs) on ischemic stroke (IS) and its main risk factors remains limited and conflicting. Therefore, we conducted Mendelian randomization (MR) to assess whether genetically predicted PUFA affected IS, lipids and blood pressure (BP).

Methods

Genetic instruments associated with IS were derived from ISGC Consortium (n = 29,633), with lipids were derived from GLGC(n = 188,577), with BP were derived from Neale Lab(n = 337,000). The inverse-variance weighted method was the main analysis to estimate the effect of exposure on outcome. Sensitivity analyses included principal components analysis, MR-Egger, weighted median, and weighted mode.

Results

Per SD increases in serum α-linolenic acid (ALA) were associated with lower IS risk, with odd ratio (OR) of 0.867(0.782,0.961), arachidonic acid (AA) were associated with higher IS risk (OR: 1.053(1.014,1.094)). Likewise, Per SD increases in ALA were associated with the lower-level low-density lipoprotein cholesterol(LDL-C), high-density lipoprotein cholesterol (HDL-C), total cholesterol (TC) (β:-0.122(− 0.144, − 0.101), − 0.159(− 0.182, − 0.135), − 0.148(− 0.171, − 0.126), respectively), AA were associated with the higher-level of LDL-C, HDL-C and TC (β:0.045(0.034,0.056), 0.059(0.050,0.067), 0.055(0.046,0.063), respectively). Linoleic acid (LA), eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA) and docosapentaenoic acid (DPA) had little or no association with IS, lipids or BP at Bonferroni-corrected significance. Different analytic methods supported these findings. The intercept test of MR-Egger implied no pleiotropy.

Conclusions

High-level plasma ALA was protective for IS but AA was the opposite. LA, EPA, DHA, and DPA had no effects on IS.
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Metadata
Title
Roles for circulating polyunsaturated fatty acids in ischemic stroke and modifiable factors: a Mendelian randomization study
Authors
Tonghui Yuan
Shucheng Si
Yunxia Li
Wenchao Li
Xiaolu Chen
Congcong Liu
Jiqing Li
Bojie Wang
Lei Hou
Yanxun Liu
Fuzhong Xue
Publication date
01-12-2020
Publisher
BioMed Central
Keyword
Stroke
Published in
Nutrition Journal / Issue 1/2020
Electronic ISSN: 1475-2891
DOI
https://doi.org/10.1186/s12937-020-00582-4

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