Association between vitamin D status and asymmetric dimethylarginine (ADMA) concentration in the Korean elderly population

Abstract

ObjectivesVitamin D deficiency has been reported to be associated with the risk of cardiovascular disease. We investigated the relationship between vitamin D status and asymmetric dimethylarginine (ADMA) concentration, a marker of endothelial dysfunction, in the Korean elderly population. Study designA cross-sectional study was conducted on 269 men and 382 women (mean age, 71.6 years) enrolled in the Korean Social Life, Health, and Aging Project (KSHAP), a population-based longitudinal study of health determinants in elderly Koreans. We stratified patients by vitamin D status into three groups according to serum 25-hydroxyvitamin D [25(OH)D] level: sufficient (≥30ng/mL, n=25), insufficient (10-<30ng/mL, n=516), and deficient (<10ng/mL, n=110). To measure endothelial dysfunction, ADMA concentration was assayed by high-performance liquid chromatography. The association between 25(OH)D status and ADMA concentration was analyzed by multiple linear regression models. ResultsThe mean ADMA concentration was significantly higher in the insufficient 25(OH)D group (0.665μmol/L, p=0.001) and the deficient 25(OH)D group (0.734μmol/L, p<0.001) compared with the sufficient 25(OH)D group (0.589μmol/L). Even after adjusting for sex, age, body mass index, blood pressure, diabetes mellitus, total and HDL cholesterol, estimated glomerular filtration rate (eGFR), smoking status, and drinking status, ADMA concentrations were higher in the insufficient group (β=0.0742μmol/L, p=0.001) and the deficient group (β=0.1417μmol/L, p<0.001) compared than in the sufficient group. In a sex-stratified analysis, 25(OH)D deficiency was associated with higher ADMA levels in both women (p<0.001) and men (p=0.007), while 25(OH)D deficiency was associated with higher ADMA levels in women (p<0.001) but not in men (p=0.631). ConclusionOur findings suggest that low serum 25(OH)D level may be associated with endothelial dysfunction in elderly Korean people.