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Plasma Lipids-Dependent Vitamin E Metabolism During Dynamic Hyperlipidemia

2026年9月17日 更新者：National Heart, Lung, and Blood Institute (NHLBI)

Plasma Lipids-dependent Vitamin E Metabolism During Dynamic Hyperlipidemia

Background:

Obesity is known to lead to diseases such as diabetes and high cholesterol (or fats) in the blood (hyperlipidemia). But no one knows why. Researchers think that high levels of fat in the blood may block important nutrients, such as vitamin E, from reaching places they are needed in the body.

Objective:

To learn how high-fat meals affect levels of vitamin E in the blood.

Eligibility:

People aged 18 to 65 with high blood fat levels. Healthy volunteers are also needed.

Design:

Participants will have 3 or 4 clinic visits in 3 months. The last visit will require them to stay in the clinic for 2 nights.

Participants will be screened. They will have a physical exam and blood tests.

After this visit, all participants must stop taking any dietary supplements.

Those who use them must also stop taking any drugs to lower their blood sugar and blood fats. These participants will have an extra visit for blood tests after 60 days.

The next visit will include 2 imaging scans:

Magnetic resonance imaging (MRI) of the abdomen. This scan will check for fat in the liver.

Dual-energy X-ray absorptiometry (DEXA). This scan measures the levels of body fat.

On day 1 of the clinic stay, participants will have 2 set meals, with nothing but water after 10 pm.

On day 2, they will drink high-fat shakes at 8 am, noon, and 4 pm. They will have blood draws every hour for 17 hours, and then every 2 hours until 7 am. The blood will be taken from a tube inserted into a vein and left in place for the day.

On day 3, they will go home.

研究概览

地位

尚未招聘

条件

干预/治疗

详细说明

Study Description:

A controlled interventional study of effects of postprandial hypertriglyceridemia from three consecutive high-fat vitamin E-stripped meals on the dynamics of plasma vitamin E concentrations in subjects with baseline normo- and hyperlipidemia, to explore the concept of vitamin E sequestration by fats in plasma.

Objectives:

Primary Objective: Compare effects of postprandial hypertriglyceridemia (PHTG) on plasma/lipoprotein vitamin E dynamics in subjects between baseline normo- and hyperlipidemia.

Secondary Objectives: Compare effects of postprandial hypertriglyceridemia (PHTG) on other fat-soluble vitamins (gamma-tocopherol, phylloquinone [K1]; menaquinone [K2]; 25-OH vitamin D; retinol [A]) and related vitamers (beta-carotene, lycopene lutein/zeaxanthin) between subjects with baseline normo- and hyperlipidemia.

Tertiary/Exploratory Objectives:

  1. Compare effects of individual high-fat meals on the dynamics of vitamin E, gamma-tocopherol, phylloquinone [K1], menaquinone [K2], 25-OH vitamin D, retinol [A], and other carotenoids between subjects with baseline normo- and hyperlipidemia.
  2. Compare effects of postprandial hypertriglyceridemia (PHTG) and resultant vitamin E dynamics on: red blood cell (RBC) membrane deformability, fluidity, and oxygen exchange capacity (p50); RBC vitamin E, plasma vitamin C, plasma dehydroascorbic acid; fasting glucose and insulin; oxidized LDL, coenzyme Q10, and plasma adipokine profile between subjects with baseline normo- and hyperlipidemia;
  3. Explore effects of postprandial hypertriglyceridemia on small RNAs including microRNAs, tRNAs, and PIWI-interacting RNAs.
  4. Explore the influence of genetic variance on the metabolism of vitamin E and other fat-soluble vitamins and related vitamers in subjects with baseline normo- and hyperlipidemia.

Endpoints:

Primary Endpoint: AUC (Area Under the Curve) of vitamin E plasma from hour 1 to hour 23, by cohort.

Secondary Endpoints: AUC of gamma-tocopherol, phylloquinone [K1], menaquinone [K2], 25-OH vitamin D and retinol [A] from hour 1 to hour 23, by cohort.

Tertiary/Exploratory Endpoints:

  1. Between the timepoints that reflect consuming 3 high-fat meals, AUC of vitamin E, gamma-tocopherol, phylloquinone [K1], menaquinone [K2], 25-OH vitamin D, retinol [A], and other carotenoids will be separately calculated for each participant.
  2. Over the course of inpatient visit, RBC membrane deformability/fluidity, p50, RBC vitamin E, plasma vitamin C, plasma dehydroascorbic acid, blood glucose, insulin, c-peptide, oxidized LDL, coenzyme Q10 and serum adipokine profiles in each subject.
  3. Over the course of inpatient visit, small RNAs including microRNAs, tRNAs, and PIWI-interacting RNAs.
  4. Genetic variance (single nucleotide polymorphisms, SNPs)- dependent change in lipid-soluble vitamin dynamics over the course of inpatient visit in each subject.

研究类型

介入性

注册 (估计的)

48

阶段

  • 不适用

联系人和位置

本节提供了进行研究的人员的详细联系信息，以及有关进行该研究的地点的信息。

学习联系方式

  • 姓名：Robert D Shamburek, M.D.
  • 电话号码：(301) 496-3460
  • 邮箱：bobs@mail.nih.gov

研究联系人备份

学习地点

  • 美国
    • Maryland
      • Bethesda、Maryland、美国、20892
        • National Institutes of Health Clinical Center
        • 接触：
          • NIH Clinical Center Office of Patient Recruitment (OPR)
          • 电话号码：TTY dial 711 (800) 411-1222
          • 邮箱：ccopr@nih.gov
        • 接触：

参与标准

研究人员寻找符合特定描述的人，称为资格标准。这些标准的一些例子是一个人的一般健康状况或先前的治疗。

资格标准

适合学习的年龄

  • 成人
  • 年长者

接受健康志愿者

不

描述

  • INCLUSION CRITERIA

Cohort 1

  1. Males and females between the ages of 18 to 65
  2. BMI 18.5 - 26.9 kg/m^2
  3. Subject understands the protocol and provides written, informed consent in addition to a willingness to comply with specified follow-up instructions and evaluations
  4. Normotensive, not on medications for hypertension
  5. Not on glucose-lowering or lipid-lowing medications
  6. Screening labs with baseline HbA1c <5.7%, baseline fasting triglyceride < 150 mg/dL and LDL <100 mg/dL
  7. Liver fat <2%

Cohort 2

  1. Males and females between the ages of 18 to 65
  2. BMI >26 kg/m^2 and <36 kg/m^2
  3. Subject understands the protocol and provides written, informed consent in addition to a willingness to comply with specified follow-up instructions and evaluations.
  4. Screening labs with baseline HbA1c <= 7.5%, agree to be off or stop oral glucose-lowering medications (metformin), baseline fasting triglyceride < 500 mg/dL and LDL <190 mg/dL, agree to be off or stop oral lipid-lowing medications for 4-10 weeks prior to the inpatient visit.
  5. Liver fat <2%

EXCLUSION CRITERIA

  1. For women: pregnancy or currently breastfeeding
  2. Subjects <18-year-old. This age group has a broad spectrum of hormonal profiles, due to development and puberty, which significantly increases the heterogenicity of the study subjects.
  3. Subjects >65-year-old. This age group has significantly increased risk of cardiovascular diseases. To minimize the risk from temporarily suspending lipid- and glucose-lowering medications and stress from serial blood draws, we exclude these individuals.
  4. Heavy alcohol user (males with >2 drinks per day or >14 drinks per week; female with >1 drinks per day or >7 drinks per week)
  5. Current smoker, or former smoker who quit smoking <15 years ago
  6. Subjects with weight changes greater than 20% baseline body weight over the past 3 months
  7. Subjects with lactose intolerance unwilling to take lactase
  8. Subjects with type 1 diabetes
  9. Subjects with hemoglobin <11 g/dL or hematocrit <33%
  10. Subjects with abnormal liver function test results
  11. Subjects with liver fat >= 2% on abdominal MRI
  12. Subjects with a history of pancreatitis, diabetes ketoacidosis, hyperosmolar hyperglycemic state, advanced atherosclerosis, cardiovascular diseases, kidney diseases, or liver diseases
  13. Subjects with fat malabsorption including: history of gastrointestinal surgery, pancreatic insufficiency, inflammatory bowel disease, celiac disease, moderate-to-severe irritable bowel syndrome, and pathologic mutations impacting lipoprotein metabolism
  14. Subjects on glucocorticoids >1 week (not including topical glucocorticoids)
  15. Subjects with HIV
  16. Subjects with uncontrolled psychiatric and/or behavioral disorders
  17. Subjects taking diabetes medications other than metformin
  18. Anticipated surgery during the study period
  19. Subjects with severe medication-resistant claustrophobia
  20. Subjects who are unwilling to stop medications, vitamins and/or dietary supplements that investigators have requested to be held
  21. Subjects participating in any other clinical study without informing investigators
  22. Any other reason or clinical condition that the investigators judge would interfere with study participation and/or be unsafe for a participant or staff member

学习计划

本节提供研究计划的详细信息，包括研究的设计方式和研究的衡量标准。

研究是如何设计的？

设计细节

  • 主要用途：基础科学
  • 分配：非随机化
  • 介入模型：并行分配
  • 屏蔽：无（打开标签）

武器和干预

参与者组/臂
干预/治疗
有源比较器：Healthy subjects
Three consecutive high-fat vitamin E-stripped meals
膳食补充剂：High fat liquid shake
Three consecutive high-fat vitamin E-stripped meals
实验性的：Subjects with hyperlipidemia
Three consecutive high-fat vitamin E-stripped meals
膳食补充剂：High fat liquid shake
Three consecutive high-fat vitamin E-stripped meals

研究衡量的是什么？

主要结果指标

结果测量
措施说明
大体时间
AUC (Area Under the Curve) of vitamin E plasma from hour 1 to hour 23 by cohort.
大体时间：From hour 1 to hour 23
Compare the effects of postprandial hypertriglyceridemia on plasma vitamin E dynamics in subjects between baseline normo- and hyperlipidemia.
From hour 1 to hour 23

次要结果测量

结果测量
措施说明
大体时间
AUC of gamma-tocopherol, phylloquinone [K1]; menaquinone [K2]; 25-OH vitamin D; retinol [A] from hour 1 to hour 23 by cohort.
大体时间：From hour 1 to hour 23
Compare the effects of postprandial hypertriglyceridemia on other fat-soluble vitamins (gamma-tocopherol, phylloquinone [K1]; menaquinone [K2]; 25-OH vitamin D; retinol [A]) and related vitamers (beta-carotene, lycopene lutein/zeaxanthin) in subjects between baseline normo- and hyperlipidemia.
From hour 1 to hour 23

合作者和调查者

在这里您可以找到参与这项研究的人员和组织。

赞助

National Heart, Lung, and Blood Institute (NHLBI)

调查人员

  • 首席研究员：Robert D Shamburek, M.D.、National Heart, Lung, and Blood Institute (NHLBI)

出版物和有用的链接

负责输入研究信息的人员自愿提供这些出版物。这些可能与研究有关。

一般刊物

有用的网址

研究记录日期

这些日期跟踪向 ClinicalTrials.gov 提交研究记录和摘要结果的进度。研究记录和报告的结果由国家医学图书馆 (NLM) 审查，以确保它们在发布到公共网站之前符合特定的质量控制标准。

研究主要日期

学习开始 (估计的)

2026年9月23日

初级完成 (估计的)

2028年11月30日

研究完成 (估计的)

2029年3月31日

研究注册日期

首次提交

2026年7月18日

首先提交符合 QC 标准的

2026年7月18日

首次发布 (实际的)

2026年7月21日

研究记录更新

最后更新发布 (实际的)

2026年9月18日

上次提交的符合 QC 标准的更新

2026年9月17日

最后验证

2026年7月21日

更多信息

与本研究相关的术语

关键字

其他相关的 MeSH 术语

其他研究编号

  • 10002623
  • 002623-H

计划个人参与者数据 (IPD)

计划共享个人参与者数据 (IPD)？

是的

IPD 计划说明

De-identified individual participant data underlying results reported in publications may be shared. Depending on the sensitivity of the dataset and risk of re-identification, data may be made available through either an open-access repository or a controlled-access repository, consistent with informed consent, institutional review, and applicable policies.@@@@@@

IPD 共享时间框架

Beginning following de-identification and publication of the primary results, or other prespecified time point, and continuing for as long as the repository or access mechanism remains available.

IPD 共享访问标准

Access to de-identified individual participant data will be determined based on the sensitivity of the data and disclosure risk. Data appropriate for broad sharing may be deposited in an open-access repository. Data requiring additional protections may be made available through a controlled-access mechanism subject to review and any applicable agreements.

IPD 共享支持信息类型

  • 研究方案
  • 国际碳纤维联合会

药物和器械信息、研究文件

研究美国 FDA 监管的药品

不

研究美国 FDA 监管的设备产品

不

此信息直接从 clinicaltrials.gov 网站检索，没有任何更改。如果您有任何更改、删除或更新研究详细信息的请求，请联系 register@clinicaltrials.gov. clinicaltrials.gov 上实施更改，我们的网站上也会自动更新.

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