Effects of a Tocotrienol-Enriched Fraction of Palm Oil on Serum Lipids in Hypercholesterolemic Subjects
试验速览
- 阶段
- 3 期
- 状态
- 终止
- 入组人数
- 13
- 试验地点
- 1
- 主要终点
- Change in LDL Cholesterol Over Time Between the 3 Groups
研究概览
简要总结
Elevated blood cholesterol, and particularly LDL cholesterol, is a risk factor for heart disease. Tocotrienols are naturally-occurring compounds in foods that may have beneficial effects on blood cholesterol. Tocotrienols are members of the vitamin E family, and are found in barley, oats, rye, coconut oil and rice bran oil, but the richest source of tocotrienols is palm oil. Certain of these tocotrienols have been shown to be effective in lowering LDL (or 'bad') cholesterol, with no adverse effects on the HDL (or 'good') cholesterol. The purpose of this study is to determine the effects of a palm-oil derived tocotrienol supplement on blood cholesterol, and particularly LDL cholesterol, in individuals who are taking statins, and have either elevated or normal cholesterol levels. Study subjects will consume a palm-oil derived supplement of tocotrienol for 3 months to determine its effects on LDL cholesterol.
详细描述
Both tocotrienols and tocopherols, whose derivatives are in eight different isoforms, are closely related structurally. Tocopherols are generally present in common vegetable oils (i.e. soy, canola). However, tocotrienols are concentrated in cereal grains (ie. oat, barley, and rye, rice bran), with the highest level found in crude palm oil. The development of new cholesterol-lowering agents has been given more and more attention by pharmaceutical companies due to the strong relationship between cholesterol and atherosclerosis. Tocotrienols, especially δ- and γ-tocotrienols, were shown to be effective nutritional agents to treat high cholesterol in recent research programs. In particular, γ-tocotrienol appears to inhibit 3-hydroxy-3-methylglutaryl-coenzyme A reductase at a posttranscriptional level and there is some evidence that tocopherols antagonize this effect. Therefore, the current study is designed to demonstrate that treatment with a tocotrienol-enriched fraction of palm oil for a three month period will lead to a significant reduction in LDL cholesterol with no effect on HDL cholesterol in patients whose cholesterol level is not adequately controlled in spite of statins. This objective will be achieved utilizing a simple three arm randomized placebo-controlled trial in a total of 99 subjects After acclimation to a step I AHA diet and no supplemental vitamin E in the diet, subjects will be given either a placebo capsule or a tocotrienol (120mg or 240mg) capsule in addition to their statin medications
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Single Group
- 主要目的
- Prevention
- 盲法
- Double (Participant, Investigator)
入排标准
- 年龄范围
- 35 Years 至 70 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Able to read, speak, and understand English
- •Male or female, 35-70 years old (inclusive)
- •Total Fasting Plasma Cholesterol of >180 mg/dl
- •Currently taking statin medications.
- •Willing to maintain AHA Step 1 diet for the duration of the study.
排除标准
- •Any subject who is taking vitamin E supplements or taking any antibiotics or other medication or dietary supplement which could interfere with the action of tocotrienols.
- •Any subject who is taking cholesterol lowering medications other than statins.
- •Any subject who has lost >5% of their body weight during the past 3 months.
- •Any subjects with a history of gastrointestinal surgery, diabetes mellitus, or other serious medical condition, such as chronic hepatitis or renal disease, bleeding disorder, congestive heart disease, chronic diarrhea disorders, myocardial infarction, coronary artery bypass graft, angioplasty within 6 months prior to screening, current diagnosis of uncontrolled hypertension (defined as BP >160mmHg, diastolic BP>95mmHg), active or chronic gastrointestinal disorders, bulimia, anorexia, laxative abuse, or endocrine diseases (except thyroid disease requiring medication) as indicated by medical history or routine physical examination.
- •Major surgery within 12 weeks prior to subject randomization and/or screening, especially cardiac surgery
- •Is currently a smoker who has a therapeutic plan to quit smoking anytime during the study period; or if not a current smoker, has quit smoking within the past 3 months.
- •Known HIV positive or known immunocompromised condition (e.g. MV, organ transplantation, treatment with immunosuppressant medications).
- •Clinical evidence of current malignancy with the exception of basal cell or squamous cell carcinoma of the skin and cervical intraepithelial neoplasia.
- •Currently receiving systemic chemotherapy and/or radiotherapy.
- •Active bleeding.
- •Subject has any disorder (excluding illiteracy or visual impairment) that compromises the ability of the subject to give written informed consent and/or to comply with study procedures.
- •In the opinion of the study investigator has a risk of non-compliance with study procedures, or cannot read, understand or complete study related materials.
研究组 & 干预措施
Gamma Delta Tocotrienols - Low Dose
33 subjects with cholesterol level (>180 mg/dl), ages 35-70, currently taking statins who meet all of the eligibility criteria in the screening phase of the study will be assigned to the TRF (63mg) arm of the study to evaluate the cholesterol suppressive actions of TRF. Subjects will be asked to take 2 tablets per day and to maintain the American Heart Association (AHA) diet for 12 weeks.
干预措施: Gamma Delta Tocotrienols - Low Dose (Drug)
Gamma Delta Tocotrienols - High Dose
33 subjects with cholesterol level (>180 mg/dl), ages 35-70, currently taking statins who meet all of the eligibility criteria in the screening phase of the study will be assigned to the TRF (127mg) arm of the study to evaluate the cholesterol suppressive actions of TRF. Subjects will be asked to take 2 tablets per day and to maintain the American Heart Association (AHA) diet for 12 weeks.
干预措施: Gamma Delta Tocotrienols - High Dose (Drug)
Sugar Pill
33 subjects with cholesterol level (>180 mg/dl), ages 35-70, currently taking statins who meet all of the eligibility criteria in the screening phase of the study will be assigned to the Placebo arm of the study to evaluate the cholesterol suppressive actions of Placebo. Subjects will be asked to take 2 tablets per day and to maintain the American Heart Association (AHA) diet for 12 weeks.
干预措施: Sugar Pill (Drug)
结局指标
主要结局
Change in LDL Cholesterol Over Time Between the 3 Groups
时间窗: Baseline and 12 weeks
Mixed-effects regression models will be used to evaluate the change in LDL cholesterol over time between the 3 groups
次要结局
未报告次要终点
研究者
Zhaoping Li
Professor of Medicine
University of California, Los Angeles