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European Journal of Epidemiology

, Volume 34, Issue 1, pp 57–66 | Cite as

Potential causal associations of serum 25-hydroxyvitamin D with lipids: a Mendelian randomization approach of the HUNT study

  • Xiao-Mei Mai
  • Vibeke Videm
  • Nuala A. Sheehan
  • Yue Chen
  • Arnulf Langhammer
  • Yi-Qian Sun
CARDIOVASCULAR DISEASE

Abstract

Observational studies have shown consistent associations between higher circulating 25-hydroxyvitamin D [25(OH)D] levels and favorable serum lipids. We sought to investigate if such associations were causal. A Mendelian randomization (MR) study was conducted on a population-based cohort comprising 56,435 adults in Norway. A weighted 25(OH)D allele score was generated based on vitamin D-increasing alleles of rs2282679, rs12785878 and rs10741657. Linear regression analyses of serum lipid levels on the allele score were performed to assess the presence of causal associations of serum 25(OH)D with the lipids. To quantify the causal effects, the inverse-variance weighted method was used for calculating MR estimates based on summarized data of individual single-nucleotide polymorphisms. The MR estimate with 95% confidence interval (CI) represents percentage difference in the lipid level per genetically determined 25 nmol/L increase in 25(OH)D. The 25(OH)D allele score demonstrated a clear association with high-density lipoprotein (HDL) cholesterol (p = 0.007) but no association with total or non-HDL cholesterol or triglycerides (p ≥ 0.27). The MR estimate showed 2.52% (95% CI 0.79–4.25%) increase in HDL cholesterol per genetically determined 25 nmol/L increase in 25(OH)D, which was stronger than the corresponding estimate of 1.83% (95% CI 0.85–2.81%) from the observational analysis. The MR estimates for total cholesterol (0.60%, 95% CI − 0.73 to 1.94%), non-HDL cholesterol (0.04%, 95% CI − 1.79 to 1.88%) and triglycerides (− 2.74%, 95% CI − 6.16 to 0.67%) showed no associations. MR analysis of data from a population-based cohort suggested a causal and positive association between serum 25(OH)D and HDL cholesterol.

Keywords

Cholesterol High-density lipoprotein (HDL) Lipid Low-density lipoprotein (LDL) Mendelian randomization Serum 25-hydroxyvitamin D [25(OH)D] Single-nucleotide polymorphisms Triglycerides Vitamin D 

Notes

Acknowledgements

The Nord-Trøndelag Health Study (HUNT) is a collaboration between the HUNT Research Centre (Faculty of Medicine and Health Sciences, NTNU—Norwegian University of Science and Technology), the Nord-Trøndelag County Council, and the Norwegian Institute of Public Health. The authors especially thank the HUNT Research Centre laboratory personnel for the measurement of serum 25(OH)D and the K. G. Jebsen Center for Genetic Epidemiology for the genotyping data.

Authors’ contributions

XMM and YQS contributed to the study design. YQS conducted statistical analyses. XMM wrote the initial draft of the manuscript. XMM, VV, NAS, YC, AL and YQS contributed to interpretation of results and writing the final draft of the manuscript. All authors approved the final version of the manuscript.

Funding

This work was supported by “Nasjonalforeningen for folkehelsen”, by The Norwegian Cancer Society (Project ID 5769155-2015) and The Research Council of Norway “Gaveforsterkning”.

Compliance with ethical standards

Conflict of interest

XMM reports grant from “Nasjonalforeningen for folkehelsen” and YQS reports grant from The Norwegian Cancer Society during the conduct of the study. All other authors declare that they have no conflict of interest.

Disclaimer

The interpretation and reporting of data are sole responsibility of the authors, and no endorsement by the grant supporters is intended nor should be inferred.

Ethics approval and consent to participate

The study was approved by the Regional Committee for Medical and Health Research Ethics. All participants gave their informed consent for participation in HUNT.

Supplementary material

10654_2018_465_MOESM1_ESM.docx (491 kb)
Supplementary material 1 (DOCX 492 kb)

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Department of Public Health and NursingNTNU - Norwegian University of Science and TechnologyTrondheimNorway
  2. 2.Department of Clinical and Molecular Medicine (IKOM)NTNU - Norwegian University of Science and TechnologyTrondheimNorway
  3. 3.Department of Immunology and Transfusion Medicine, St. Olavs HospitalTrondheim University HospitalTrondheimNorway
  4. 4.Department of Health Sciences, College of Life SciencesUniversity of LeicesterLeicesterUK
  5. 5.School of Epidemiology and Public Health, Faculty of MedicineUniversity of OttawaOttawaCanada

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