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Lipids and cardiovascular/metabolic health

Plasma levels of marine n-3 fatty acids and cardiovascular risk markers in renal transplant recipients

Abstract

Background/Objectives:

Cardiovascular (CV) disease is the leading cause of death after renal transplantation. Marine n-3 polyunsaturated fatty acids (PUFAs) exert potential cardio-protective metabolic effects and might reduce CV morbidity and mortality in renal transplant recipients (RTRs).

Subjects/Methods:

In this cross-sectional study of 1990 Norwegian RTRs, transplanted between 1999 and 2011, associations between plasma phospholipid marine n-3 PUFA levels and various CV risk markers at 10 weeks after transplant were evaluated.

Results:

Higher plasma marine n-3 PUFA levels were associated with lower resting heart rate (rHR), lower fasting plasma glucose (fPG) levels, lower plasma triglyceride levels and higher plasma high-density lipoprotein (HDL) cholesterol levels. Plasma levels of eicosapentaenoic acid, but not docosahexaenoic acid, showed a positive association with plasma HDL cholesterol levels. Plasma marine n-3 PUFA levels were not associated with plasma low-density lipoprotein cholesterol levels, pulse wave velocity or systolic and diastolic blood pressure. A negative association between plasma marine n-3 PUFA levels and CV mortality was weakened by additional adjustment for plasma triglyceride levels and rHR. The ratio of n-6 to n-3 PUFAs showed similar associations with CV risk markers as absolute plasma marine n-3 PUFA levels.

Conclusions:

This is the first study in RTRs showing that marine n-3 PUFAs are negatively associated with rHR and fPG in addition to beneficial effects on plasma HDL cholesterol and triglyceride levels. Especially, effects on autonomic nervous function and triglyceride metabolism might contribute to explain the lower CV mortality risk with higher plasma marine n-3 PUFA levels previously shown in this cohort.

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Acknowledgements

We thank coworkers Rikke Bülow Eschen, Annette Andreassen, Birthe H Thomsen and Inge Aardestrup at The Lipid Research Laboratory, Aalborg University Hospital, Denmark, for analyzing plasma phospholipid fatty acids and Dr Stein Bergan at Oslo University Hospital, Rikshospitalet, Norway, for laboratory analyzes. We thank Dr Torbjørn Leivestad at The Norwegian Renal Registry, Oslo University Hospital, Rikshospitalet, for provision of data. Finally, we also thank the study participants and the funding sources South-Eastern Norway Regional Health Authority, Gidske and Peter Jacob Sørensen Research Fund, The Norwegian National Association for Kidney Patients and Transplant Recipients Research Fund, Nathalia and Knut Juul Christensen Research Fund, Signe and Albert Bergsmarken Research Fund, The Raagholt Foundation, The Freia Corporation Medical Fund and Gertrude and Jack Nelsons Research Fund for their support. IAE and DOD received research funding from South-Eastern Norway Regional Health Authority. IAE received additional funding from Gidske and Peter Jacob Sørensen Research Fund, The Norwegian National Association for Kidney Patients and Transplant Recipients Research Fund, Nathalia and Knut Juul Christensen Research Fund, Signe and Albert Bergsmarken Research Fund, The Raagholt Foundation, The Freia Corporation Medical Fund and Gertrude and Jack Nelsons Research Fund. The funding organizations had no role in the design of the study, data collection, data analysis, interpretation, manuscript preparation or the decision to submit.

Author contributions

Concept and design: MS, TJ, AH, JHC and IAE. Provision of study patients: TJ, AÅ and AH. Collection and assembly of data: MEL, KL, DOD, AH, TJ, AÅ and IAE. Fatty acid analysis: EBS. Data analysis and interpretation: DOD and IAE. Administrative, technical and logistic support: MS, TJ, AÅ, AH and EBS. Drafting of article: IAE. Critical revision of the article: DOD, MS, KSB, JHC, EBS, AÅ, KL, MEL, AH and TJ. Final approval of manuscript: IAE, DOD, KSB, MS, JHC, EBS, AÅ, MEL, KL, AH and TJ.

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Correspondence to I A Eide.

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Supplementary Information accompanies this paper on European Journal of Clinical Nutrition website

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Eide, I., Dahle, D., Svensson, M. et al. Plasma levels of marine n-3 fatty acids and cardiovascular risk markers in renal transplant recipients. Eur J Clin Nutr 70, 824–830 (2016). https://doi.org/10.1038/ejcn.2016.14

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