Nutr Res Pract.  2019 Dec;13(6):498-508. 10.4162/nrp.2019.13.6.498.

Association of circulating 25-hydroxyvitamin D levels with hypertension and blood pressure values in Korean adults: A Mendelian randomization study on a subset of the Korea National Health and Nutrition Survey 2011–2012 population

• Kwak SY
• Cho Y
• Oh H
• Shin MJ

• KMID: 2464129
• DOI: http://doi.org/10.4162/nrp.2019.13.6.498

Abstract

BACKGROUND/OBJECTIVES
Lower circulating 25-hydroxyvitamin D [25(OH)D] levels are associated with a higher risk of hypertension (HTN); however, it remains unclear whether the relationship is causal. We aimed to evaluate the causal effects of circulating 25(OH)D levels on the prevalence of HTN in the Korean population using the Mendelian randomization (MR) approach.
SUBJECTS/METHODS
Epidemiological data, serum 25(OH)D data, and genomic DNA biospecimens were obtained from 2,591 participants, a subset of the study population in the Korea National Health and Nutrition Survey 2011-2012. Five 25(OH)D-related single nucleotide polymorphisms (SNPs; DHCR7 rs12785878, CYP2R1 rs10741657, CYP2R1 rs12794714, CYP24A1 rs6013897, and GC rs2282679), identified a priori from genome-wide association studies, were used as instrument variables (IVs) for serum 25(OH)D levels. In the MR analysis, we performed IV analyses using the two-stage least squares method.
RESULTS
In the observational analysis, circulating 25(OH)D levels were found to be inversely associated with the HTN prevalence in ordinary least squares models (odds ratio: 0.97, 95% confidence interval: 0.96, 0.99) after adjusting for the potential confounders. There were differences in the circulating 25(OH)D levels across genotypes of individual SNPs. In the MR analysis, using individual SNPs as IVs, 25(OH)D levels were not associated with the HTN prevalence.
CONCLUSIONS
We found no association between genetically determined circulating 25(OH)D levels and HTN in Korean adults. Our results are listed owing to the relatively small sample size and possible weak instrument bias; therefore, further studies are needed to confirm these results.

Keyword

Vitamin D; hypertension; blood pressure; causality

MeSH Terms

Adult*
Bias (Epidemiology)
Blood Pressure*
DNA
Genome-Wide Association Study
Genotype
Humans
Hypertension*
Korea*
Least-Squares Analysis
Methods
Nutrition Surveys*
Polymorphism, Single Nucleotide
Prevalence
Random Allocation*
Sample Size
Vitamin D
Vitamin D3 24-Hydroxylase
DNA
Vitamin D
Vitamin D3 24-Hydroxylase

Figure

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  Fig. 1 Flow chart of the study participant selection

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