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doi: 10.1097/gme.0b013e318212539d
Original Articles

Identification of a mechanism for increased cardiovascular risk among individuals with low vitamin D concentrations

Schnatz, Peter F. DO, FACOG, FACP, NCMP1,2,3,4; Nudy, Matthew1; O'Sullivan, David M. PhD1; Ethun, Kelly DVM5; Appt, Susan E. DVM5; Clarkson, Thomas B. DVM5

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Objective: The aim of this study was to investigate the plasma concentrations of vitamin D and its association with plasma lipid profiles.

Methods: Plasma vitamin D3 and lipid concentrations were measured in 119 female cynomolgus monkeys (premenopausal, n = 49; ovariectomized, n = 70) consuming approximately 1,000 IU per day of vitamin D3. In a subset of the ovariectomized monkeys (n = 23), vitamin D3 was remeasured after 6 months. The concentrations of vitamin D3 were analyzed as a continuous variable and were divided at the median into high (≥48 ng/mL) versus low (<48 ng/mL) groupings.

Results: Among the 119 monkeys, the range of vitamin D3 concentrations was 24.0 to 95.2 ng/mL (mean ± SD, 48.5 ± 12.7 ng/mL). Plasma vitamin D3 concentration was positively associated with high-density lipoprotein cholesterol (HDL-C; P = 0.003). Monkeys in the high vitamin D3 group had a significantly greater plasma HDL-C concentration (57.9 mg/dL) than did those in the low vitamin D3 group (47.1 mg/dL; P = 0.001). Although the difference was not significant (P = 0.120), the monkeys in the high vitamin D3 group had a decreased total plasma cholesterol-to-HDL-C ratio compared with those in the low vitamin D3 group (5.4 and 6.2, respectively), potentially putting them at lower risk of atherosclerosis development.

Conclusions: Given that the monkeys all consumed a diet replete in vitamin D3, it seems that individual differences in vitamin D absorption or metabolism may have determined whether the monkeys had high or low concentrations of vitamin D3. Lower vitamin D3 was associated with a more atherogenic lipid profile, a major risk factor for progressing to coronary artery atherosclerosis in monkeys and human beings.

©2011The North American Menopause Society


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