Vitamin d, adiposity, and calcified atherosclerotic plaque in african-americans.

Freedman BI, Wagenknecht LE, Hairston KG, Bowden DW, Carr JJ, Hightower RC, Gordon EJ, Xu J, Langefeld CD, Divers J
J Clin Endocrinol Metab. 2010 95 (3): 1076-83

PMID: 20061416 · PMCID: PMC2841532 · DOI:10.1210/jc.2009-1797

CONTEXT - Inverse associations are reported between circulating 25-hydroxyvitamin D and visceral adiposity. The effects of vitamin D levels on atherosclerosis are unknown.

OBJECTIVE - The objective of this study was to test for relationships between vitamin D, adiposity, bone density, and atherosclerosis in African-Americans.

DESIGN - Circulating 25-hydroxyvitamin D, 1,25 dihydroxyvitamin D, intact PTH, C-reactive protein and computed tomography-derived calcified atherosclerotic plaque (CP), bone density, and fat volumes were measured.

SETTING - Examinations were performed at a single outpatient general clinical research center visit.

SUBJECTS - Three hundred forty African-Americans with type 2 diabetes were evaluated. Mean +/- SD age was 55.6 +/- 9.6 yr, diabetes duration 10.6 +/- 8.3 yr, glomerular filtration rate 1.6 +/- 0.5 ml/sec, body mass index 35.6 +/- 8.7 kg/m(2), and 25-hydroxyvitamin D concentration 50.4 +/- 30.5 nmol/liter.

MAIN OUTCOME MEASURE - Biomarkers were tested for association with pericardial, visceral, im, and sc adipose tissues; thoracic and lumbar vertebral bone density; and aorta, coronary, and carotid artery CP.

RESULTS - Adjusting for age, gender, body mass index, glycosylated hemoglobin, and glomerular filtration rate, 25-hydroxyvitamin D was negatively associated with visceral adiposity (P = 0.009) and positively associated with carotid artery CP and aorta CP (P = 0.013 and 0.014, respectively) but not with coronary artery CP or bone density.

CONCLUSIONS - We confirmed an inverse association between vitamin D and visceral adiposity in African-Americans with diabetes. In addition, positive associations exist between 25-hydroxyvitamin D and aorta and carotid artery CP in African-Americans. The effects of supplementing vitamin D to raise the serum 25-hydroxyvitamin D level on atherosclerosis in African-Americans are unknown. Prospective trials are needed to determine the cardiovascular effects of supplemental vitamin D in this ethnic group.

MeSH Terms (13)

Adiposity Adult African Americans Aged Atherosclerosis Bone Density Diabetes Mellitus, Type 2 Female Humans Male Middle Aged Vitamin D Vitamin D Deficiency

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