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Grape Impact on Human Gut Microbiome

2026年8月27日 更新者：Gang Fang、Icahn School of Medicine at Mount Sinai

High-Resolution Assessment of California Table Grape Consumption on the Human Gut Microbiome-Immune Axis

This is a bio-specimen analysis and dietary intervention study that will examine whether the daily consumption of California table grape powder significantly modulates the gut microbiome and systemic immune profiles in healthy adults. The primary objective is to characterize longitudinal changes in microbial strains, metabolites, and immune markers following a 4-week grape intervention compared to a placebo. Methods include a screening of up to 300 individuals to evaluate pre-specified microbiome eligibility criteria, followed by a randomized, double-blind, placebo-controlled, parallel-group design where up to 40 participants will provide fecal and blood samples for high-resolution metagenomic sequencing and LC-MS/MS metabolomics at baseline, mid-study, and post-washout. Participants who meet the microbiome screening and other study eligibility criteria may be invited to participate in the intervention phase; participation in the screening phase does not guarantee enrollment in the intervention phase.

研究概览

地位

尚未招聘

条件

干预/治疗

详细说明

The human gut microbiome consists of trillions of microorganisms that are essential to host metabolism, immune system regulation, and the maintenance of disease resistance. Recent findings indicate that dietary changes can rapidly and significantly alter the composition of these microbial communities, leading to substantial effects on the host's overall physiology. Foods rich in polyphenols are highly effective at modulating this environment because they possess selective antimicrobial properties and exert beneficial prebiotic effects on the resident microbiota.

Polyphenol-rich foods beneficially modulate the human gut microbiome with downstream metabolic and immune effects. California table grapes contain a complex mixture of phenolics, resveratrol, flavans, flavonols, and anthocyanins, making them ideal candidates for investigating gastrointestinal and immune health. However, previous grape-microbiome studies have been limited by small sample sizes (n=21-29), short durations (2 weeks), low-resolution microbiome technologies (16S profiling), and failure to measure corresponding inflammatory or immune biomarkers.

This project will first conduct a microbiome screening phase in up to 300 healthy adults to identify individuals who meet pre-specified microbiome and other study eligibility criteria. Eligible individuals may then be invited to participate in a rigorous, multi-omic pilot study using standardized freeze-dried grape powder to determine how daily grape consumption modulates the gut microbiome-immune axis in up to 40 healthy adults. The study team will employ state-of-the-art metagenomic sequencing to achieve high-resolution microbiome profiling; metabolomic analysis; and immune biomarker profiling to assess gastrointestinal inflammation.

Specific Aims

Overarching Goal: To build on our unique expertise in high-resolution microbiome analyses to conduct a rigorous, multi-omic pilot study determining how daily consumption of California table grape powder modulates the human gut microbiome-immune axis in healthy adults.

Hypothesis: Compared to a placebo, daily consumption of California table grape powder will beneficially modulate the gut microbiome by: (1) altering microbial composition; (2) shifting the fecal metabolome to increase grape-derived and microbial-derived anti-inflammatory compounds; and (3) reducing baseline biomarkers of gastrointestinal inflammation.

研究类型

介入性

注册 (估计的)

40

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

研究联系人备份

学习地点

  • 美国
    • New York
      • New York、New York、美国、10029
        • Icahn School of Medicine at Mount Sinai
        • 接触：
        • 接触：
        • 首席研究员：
          • Gang Fang, PhD

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

是的

描述

Inclusion Criteria

  • Healthy adults between the ages of 45 and 65 years old
  • Body Mass Index (BMI) within the range of 18.5 to 25.9 kg/m²
  • Willing and able to provide informed consent
  • Agreement to maintain usual dietary patterns throughout the study, except for the provided study powder
  • Agreement to avoid exclusion criteria (below) during the study period
  • Able and willing to collect and mail a stool sample during the microbiome screening phase and, if enrolled in the intervention phase, and at the three defined study timepoints
  • For enrollment into the intervention phase, meeting pre-specified microbiome eligibility criteria based on the screening stool sample, as defined in the study protocol.

Exclusion Criteria

  • Antibiotic use within 6 months prior to enrollment, or any planned antibiotic use during the study
  • Recent initiation of or dose change in any medication or supplement within 3 months prior to enrollment, or planned initiation or dose change during the study
  • Initiation or change of probiotic, prebiotic, or synbiotic supplements during the study. Existing long-term stable probiotic use is permitted
  • Current or recent (within 3 months) systemic corticosteroid, biologic, DMARD, chemotherapy, or other immunosuppressive therapy; regular NSAID use (more than 2 doses per week); or planned initiation of any of the above during the study
  • Active inflammatory bowel disease, irritable bowel syndrome with current symptoms, celiac disease, microscopic colitis, active diverticulitis, or acute gastrointestinal infection within 3 months; any history of C. difficile infection; or prior bariatric surgery or bowel resection
  • Uncontrolled or unstable chronic disease, including but not limited to uncontrolled diabetes (HbA1c >8%), chronic hepatitis B or C, cirrhosis, moderate-to-severe chronic kidney disease (eGFR <60), active or recent (within 5 years) malignancy, solid organ or bone marrow transplant, or uncontrolled cardiovascular or psychiatric illness
  • Planned major change in diet, physical activity, or lifestyle during the study period; recent significant weight change (>5% in 3 months); or current adherence to an extreme dietary pattern (strict vegan, ketogenic, carnivore, or very-low-carb) maintained for more than 3 months
  • Habitual high polyphenol intake, including daily consumption of more than 2 servings of berries, more than 500 mL of red wine, more than 4 cups of tea, or regular consumption of pomegranate, grape juice, or dark chocolate more than 3 times per week, as assessed by screening food-frequency questionnaire
  • Heavy alcohol use (more than 14 drinks per week), current tobacco use, or daily cannabis use
  • Known grape allergy or sensitivity; pregnancy, planned pregnancy, or breastfeeding during the study; current participation in other interventional clinical trials; or any condition that, in the investigator's judgment, would compromise study participation, compliance, or data interpretation

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：随机化
  • 介入模型：并行分配
  • 屏蔽：三倍

武器和干预

参与者组/臂
干预/治疗
实验性的：Grape Powder
Receive grape powder for consumption during intervention stage.
膳食补充剂：Grape Powder
72 g of grape powder for daily consumption for 28 days.
安慰剂比较：Control
Receive placebo control powder for consumption during intervention stage.
其他：Placebo Powder
72 g of matching placebo for daily consumption for 28 days.

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
Long read sequencing
大体时间：3 collections at T0 (after 3 weeks of dietary control), at week 4 (after grape or placebo powder daily), and at week 8 (after 4 weeks of returning back to normal diet)
Sequencing DNA from fecal samples to identify bacteria. This will assess whether the grape powder induces a change in the abundance of beneficial species/decrease in harmful species, following treatment, compared to control. This will be quantitatively assessed via sequencing.
3 collections at T0 (after 3 weeks of dietary control), at week 4 (after grape or placebo powder daily), and at week 8 (after 4 weeks of returning back to normal diet)

次要结果测量

结果测量
措施说明
大体时间
Fecal metabolites profile from LC-MS/MS
大体时间：3 collections at T0 (after 3 weeks of dietary control), at week 4 (after grape or placebo powder daily), and at week 8 (after 4 weeks of returning back to normal diet)
Fecal metabolites as measured by liquid chromatography-tandem mass spectrometry (LC-MS/MS)
3 collections at T0 (after 3 weeks of dietary control), at week 4 (after grape or placebo powder daily), and at week 8 (after 4 weeks of returning back to normal diet)
Fecal calprotectin level measured by ELISA
大体时间：3 collections at T0 (after 3 weeks of dietary control), at week 4 (after grape or placebo powder daily), and at week 8 (after 4 weeks of returning back to normal diet)
Fecal calprotectin as measured by ELISA. Elevated levels of calprotectin are a sensitive indicator of mucosal irritation.
3 collections at T0 (after 3 weeks of dietary control), at week 4 (after grape or placebo powder daily), and at week 8 (after 4 weeks of returning back to normal diet)
Fecal albumin level measured by ELISA
大体时间：3 collections at T0 (after 3 weeks of dietary control), at week 4 (after grape or placebo powder daily), and at week 8 (after 4 weeks of returning back to normal diet)
Fecal albumin as measured by ELISA. Fecal albumin serves as a proxy for intestinal permeability, as its presence in the gut lumen suggests a leak across the epithelial barrier.
3 collections at T0 (after 3 weeks of dietary control), at week 4 (after grape or placebo powder daily), and at week 8 (after 4 weeks of returning back to normal diet)
Fecal Lipocalin-2 measured by ELISA
大体时间：3 collections at T0 (after 3 weeks of dietary control), at week 4 (after grape or placebo powder daily), and at week 8 (after 4 weeks of returning back to normal diet)
Fecal Lipocalin-2 as measured by ELISA. Fecal Lipocalin-2 is produced by both epithelial and immune cells in response to bacterial stressors.
3 collections at T0 (after 3 weeks of dietary control), at week 4 (after grape or placebo powder daily), and at week 8 (after 4 weeks of returning back to normal diet)

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

Icahn School of Medicine at Mount Sinai

调查人员

  • 首席研究员：Gang Fang, PhD、Icahn School of Medicine at Mount Sinai

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1日

初级完成 (估计的)

2027年2月1日

研究完成 (估计的)

2027年2月1日

研究注册日期

首次提交

2026年8月27日

首先提交符合 QC 标准的

2026年8月27日

首次发布 (实际的)

2026年9月1日

研究记录更新

最后更新发布 (实际的)

2026年9月1日

上次提交的符合 QC 标准的更新

2026年8月27日

最后验证

2026年8月1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

  • STUDY-26-00544
  • IN300001209 (其他赠款/资助编号：California Table Grape Commission)

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

All of the individual participant data collected during the trial, after deidentification.

IPD 共享时间框架

Beginning 3 months and ending 5 years following article publication.

IPD 共享访问标准

Investigators whose proposed use of the data has been approved by an independent review committee ('learned intermediary') identified for this purpose. To achieve aims in the approved proposal.

IPD 共享支持信息类型

  • 研究方案
  • 树液
  • 国际碳纤维联合会
  • 分析代码

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

在美国制造并从美国出口的产品

不

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