Effect of Magnesium Treatment on Vitamin D Resistance
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 180
- 试验地点
- 2
- 主要终点
- Comparisons of the Changes of Blood 25-Hydroxyvitamin D2 (25(OH)D2) Between Magnesium Treatment and Placebo Arm, Stratified by the Baseline 25-hydroxyvitamin D (25(OH)D) Levels
研究概览
简要总结
One striking observation is that a large portion of the inter-person variation in serum 25-hydroxyvitamin D (25(OH)D) levels is unexplained. In vitro and in vivo studies indicate vitamin D synthesizing and metabolizing enzymes are Mg-dependent. Magnesium (Mg) supplementation substantially reversed the resistance to vitamin D treatment in patients with magnesium-dependent vitamin-D-resistant rickets. The investigators reported in 2013 from observational studies conducted in the general US population that Mg intake significantly interacted with vitamin D intake in affecting vitamin D status as well as interacted with serum 25(OH)D in risk of cardiovascular disease mortality and, maybe, colorectal cancer mortality. The potential interaction between Mg and vitamin D was supported by two subsequent studies, including a Finnish cohort study and a mouse study.
In the parent study (Personalized Prevention of Colorectal Cancer Trial, NCT01105169), the investigators proposed to measure blood concentration of total 25(OH)D as a secondary aim using Elisa approach. However, following the novel finding of Mg-vitamin D interaction published by the investigators in 2013, they submitted a separate grant application to NCI which was funded in 2014. In the new study, the investigators proposed to use a LC-MS approach, which is more accurate and specific than an Elisa method, to measure 5 vitamin D metabolites. This new ancillary study allows the investigators to evaluate whether Mg supplementation differentially affects vitamin D synthesis and metabolism dependent on baseline serum 25(OH)D levels using existing biospecimens collected in our double-blind placebo-controlled randomized chemoprevention trial.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Prevention
- 盲法
- Triple (Participant, Investigator, Outcomes Assessor)
入排标准
- 年龄范围
- 40 Years 至 85 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Participants from our parent study (Personalized Prevention of Colorectal Cancer Trial, NCT#01105169, IRB#100106);
- •Participants who had completed the above study before the time of the sample selection (October 2015);
- •Participants consent to store/share samples for future research in colorectal tumors.
排除标准
- •Participants cannot provide their blood samples in the parent study.
结局指标
主要结局
Comparisons of the Changes of Blood 25-Hydroxyvitamin D2 (25(OH)D2) Between Magnesium Treatment and Placebo Arm, Stratified by the Baseline 25-hydroxyvitamin D (25(OH)D) Levels
时间窗: 12 weeks
25(OH)D2 was extracted from plasma by liquid extraction and measured by using a novel liquid chromatography-mass spectrometry (LC-MS) method. The baseline 25(OH)D were measured by: the baseline value of 25(OH)D2 + the baseline value of 25(OH)D3. The changes of 25(OH)D2 were measured as: the post-treatment value of 25(OH)D2 (at Week 12) - the pre-treatment value of 25(OH)D2 (at baseline).
Comparisons of the Changes of Blood 25-Hydroxyvitamin D3 (25(OH)D3) Between Magnesium Treatment and Placebo Arm, Stratified by the Baseline 25-hydroxyvitamin D (25(OH)D) Levels
时间窗: 12 weeks
25(OH)D3 was extracted from plasma by liquid extraction and measured by using a novel liquid chromatography-mass spectrometry (LC-MS) method. The baseline 25(OH)D were measured by: the baseline value of 25(OH)D2 + the baseline value of 25(OH)D3. The changes of 25(OH)D3 were measured as: the post-treatment value of 25(OH)D3 (at Week 12) - the pre-treatment value of 25(OH)D3 (at baseline).
Comparisons of the Changes of Blood 24,25-dihydroxyvitamin D3 (24,25(OH)2D3) Between Magnesium Treatment and Placebo Arm, Stratified by the Baseline 25-hydroxyvitamin D (25(OH)D) Levels
时间窗: 12 weeks
24,25(OH)2D3 was extracted from plasma by liquid extraction and detected by using a novel liquid chromatography-mass spectrometry (LC-MS) method. The baseline 25(OH)D were measured by: the baseline value of 25(OH)D2 + the baseline value of 25(OH)D3. The changes of 24,25(OH)2D3 were measured as: the post-treatment value of 24,25(OH)2D3 (at Week 12) - the pre-treatment value of 24,25(OH)2D3 (at baseline).
次要结局
未报告次要终点
研究者
Martha Shrubsole
Research rofessor
Vanderbilt University Medical Center