Effect of Fasting and Refeeding on T-cell Fate

Sponsor
National Heart, Lung, and Blood Institute (NHLBI) (NIH)
Overall Status
Completed
CT.gov ID
NCT02719899
Collaborator
(none)
28
Enrollment
1
Location
10.3
Actual Duration (Months)
2.7
Patients Per Site Per Month

Study Details

Study Description

Brief Summary

Background:

Researchers want to better understand the body s immune response to calorie restriction. To do this, they are asking healthy volunteers to fast for 24 hours. Researchers will test immune response before and after fasting.

Objectives:

To explore the benefits of calorie restriction on immune health.

Eligibility:

Healthy volunteers ages 21 to 37 with a body mass index between 22 and 29.

Design:

Participants will be screened with medical history, physical exam, and blood tests.

Participants will visit NIH after an overnight fast. Their baseline immune response will be taken. They will give blood and urine samples. Then they will be given breakfast. This visit will take about 2 hours.

Participants will fast (not eat or drink anything except water) for the next 24 hours. They will return to NIH the next morning. Their immune response will be taken. They will give blood and urine samples. Then they will be given breakfast. Their immune response will be taken 3 hours later. They will give a blood sample. This visit will take about 4 hours.

Condition or DiseaseIntervention/TreatmentPhase

    Detailed Description

    Intermittent caloric restricted or fasting has numerous health effects including the reduction in numerous cardiovascular and pulmonary disease risk factors. The cellular programs activated by caloric restriction are similarly regulated in preclinical and clinical studies in response to a 24-hour fast. We have found that a beneficial effect of a 24-hour fasting blunts the activation of a component of the innate immune system, termed the NLRP3 inflammasome. This inflammasome, as a mediator of sterile inflammation, is associated with the development of diabetes, asthma and atherosclerosis. At the same time, we found that refeeding after the 24-hour fast significantly increased NLRP3 protein levels. As NLRP3 is increased in obesity, the nutrient intervention (24 hour fast and then refeeding) we studied may be useful to evaluate nutrient-overload effects on the immune system. Pertaining to this it has recently been found in a preclinical study that NLRP3 can also orchestrate differentiation of na(SqrRoot) ve T cells into T(H)2 cells. Interestingly both the NLRP3 inflammasome and T(H)2 cell activation contribute to asthma. In this context we hypothesize that the assessment of the effect on refeeding on T(H)2 cell differentiation (polarity) may allow us to dissect out the mechanisms underpinning nutrient overload induced T(H)2 cell activation. To evaluate this blood samples to test T-cell biology will be collected in subjects, at baseline, after a fixed caloric meal and in response to a 24-hour fast (water intake will not be restricted). The objective of this pilot study is to identify if nutrient-load regulates T-Cell differentiation capacity and to test whether this pathway could be investigated as a therapeutic target to blunt/negate the inflammation associated with nutrient-excess associated diseases including asthma.

    Study Design

    Study Type:
    Observational
    Actual Enrollment :
    28 participants
    Observational Model:
    Cohort
    Time Perspective:
    Prospective
    Official Title:
    Pilot Study to Evaluate the Effect of Fasting and Refeeding on T-Cell Fate
    Actual Study Start Date :
    Apr 18, 2016
    Actual Primary Completion Date :
    Feb 24, 2017
    Actual Study Completion Date :
    Feb 24, 2017

    Arms and Interventions

    ArmIntervention/Treatment
    1

    Healthy Volunteers

    Outcome Measures

    Primary Outcome Measures

    1. The primary outcome will be the change in TH2 cell cytokine (IL-4, IL-5 and/or IL-13) secretion in response to T-cell differentiation comparing the fasted to the refeeding response. [24 hours]

      The comparisons will be performed using paired two-tailed Student t-tests. Significance will be tested at the 0.05 alpha level in this pilot study

    Secondary Outcome Measures

    1. To identify if nutrient-load regulates T-Cell differentiation capacity and to test whether this pathway could be investigated as atherapeutic target to blunt/negate the inflammation associated with nutrient-excess associated diseases includin... [Visit 3, 3hrs post-meal]

      Blood samples to test T-cell biology will be collected in subjects, at baseline, after a fixed caloric meal and in response to a 24-hour fast (water intake will not be restricted). Analysis of T-cell interleukin expression and regulation and mitochondrial functioning in primary T-cells. Analysis of mitochondrial biology in these immune-modulatory effects.

    2. Evaluate whether these effects are associated with activation of the Sirt3 and its canonical mitochondrial adaptive programs. [Visit 3, 3hrs post-meal]

      Analysis of difference in additional T-cell polarity signatures. Analysis ofcytokine and other protein levels in serum comparing the fed versus fasted states. Analysis of serum metabolites that may be modulating T-cell polarity.

    Eligibility Criteria

    Criteria

    Ages Eligible for Study:
    21 Years to 37 Years
    Sexes Eligible for Study:
    All
    Accepts Healthy Volunteers:
    No
    • INCLUSION CRITERIA:

    As this is a pilot study, the age-range and BMI range of subjects will be restricted to potentially reduce metabolic variables associated with a wide age- and BMI-range.

    • Males and females between the ages of 21 and 37

    • BMI greater than or equal to 22 and less than 30

    EXCLUSION CRITERIA:
    • Subjects with an acute or chronic illness as per history, on laboratory analysis or due to use of medications

    • Subjects taking vitamins or supplements or any medications, except oral contraceptives, within 4 weeks of participation into this study

    • BMI less than 22 or greater than or equal to 30

    • Female subjects who are pregnant or lactating

    • Subjects who have donated blood or participated in another clinical trial involving blood draws in the last 8 weeks

    • Subjects who use nicotine products

    Contacts and Locations

    Locations

    SiteCityStateCountryPostal Code
    1National Institutes of Health Clinical CenterBethesdaMarylandUnited States20892

    Sponsors and Collaborators

    • National Heart, Lung, and Blood Institute (NHLBI)

    Investigators

    • Principal Investigator: Michael N Sack, M.D., National Heart, Lung, and Blood Institute (NHLBI)

    Study Documents (Full-Text)

    None provided.

    More Information

    Additional Information:

    Publications

    Responsible Party:
    National Heart, Lung, and Blood Institute (NHLBI)
    ClinicalTrials.gov Identifier:
    NCT02719899
    Other Study ID Numbers:
    • 160085
    • 16-H-0085
    First Posted:
    Mar 25, 2016
    Last Update Posted:
    Oct 4, 2021
    Last Verified:
    Jan 21, 2021
    Keywords provided by National Heart, Lung, and Blood Institute (NHLBI)
    Additional relevant MeSH terms:

    Study Results

    No Results Posted as of Oct 4, 2021