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Monkeys each got 1000 IU daily - but vitamin D in blood varied with HDL – May 2011

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

Menopause. 2011 May 17.
Schnatz PF, Nudy M, O'Sullivan DM, Ethun K, Appt SE, Clarkson TB.

From the Departments of 1 ObGyn and 2 Internal Medicine, The Reading Hospital and Medical Center, Reading, PA;
Departments of 3 ObGyn and 4 Internal Medicine, Jefferson Medical College of Thomas Jefferson University, Philadelphia, PA; and
5 Department of Pathology/Comparative Medicine, Wake Forest University, Winston-Salem, NC.

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

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.

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.

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.

PMID: 21593696
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