The Effect of Vitamin A Supplementation on Cytokine Profile in Obesity

July 28, 2011 updated by: Tehran University of Medical Sciences

The Effect of Vitamin A Supplementation on CD4+ T-cell Secretion in Obese Individuals

In this double blind placebo controlled trial,cytokine secretion of CD4+ T-cells after 4 month supplementation of vitamin A will be compared with placebo intaking group.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Unknown

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

Obesity is a chronic disease consisting of the increase in body fat stores. Obesity is an important health concern because of its well known relationships with metabolic and endocrine disorders such as cardiovascular disease, type 2 diabetes, hypertension and immune dysfunction. Low-grade systemic inflammation, confirmed by the increase of inflammatory markers such as C-reactive protein and interleukin-6 has been observed in obesity. CD4+ T-helpers are the most important regulators of immune system. Epidemiological evidence has linked obesity to several (but not all) autoimmune disorders, including inflammatory bowel disease (IBD) and psoriasis .Some sublineages of T- helpers plays core roles in immune dysfunction, and recent evidence demonstrates that an imbalance of T-cell subgroups including Th1, Th2, Th17 and Treg has occurred in obesity. This imbalance is the redirection of the immune response from most often Th2 and Treg like responses to Th1 and Th17 like responses respectively, however the opposite is desired. Vitamin A (VA) or VA-like analogs known as retinoids, are potent hormonal modifiers of type 1 or type 2 responses but a definitive description of their mechanism(s) of action is lacking. High level dietary vitamin A enhances Th2 cytokine production and IgA responses, and is likely to decrease Th1 cytokine production. Retinoic acid inhibits IL-12 production in activated macrophages, and RA pretreatment of macrophages reduces IFNγ and TNF α production and increases IL4 production in antigen primed CD4 T cells. Supplemental treatment with vitamin A or retinoic acid (RA) decreases IFNγ and increases IL5, IL10, and IL4 production.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
84

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 4

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

20 years to 52 years (Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

waist to hip ratio >0.8 and BMI>30 kg/m2 for obese individuals waist to hip ratio <0.8 and BMI 18.5 - 24.9 kg/m2 for Non obese individuals

Exclusion Criteria:

  • subjects who have diseases which affect on Th1/Th2 balance such as asthma, active viral infections, and autoimmune diseases, OR
  • subjects with pregnancy, lactation, menopause, diabetes
  • subjects who have allergy to vitamin A compounds, OR
  • subjects who have used vitamin supplements or in last 3 months, OR
  • subjects with morbid obesity(BMI >40 kg/m2),OR
  • overweight subjects (25 <BMI<29.9 kg/m2)

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Quadruple

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Active Comparator: Non obese/ vitamin A
Non obese individuals with body mass index 18.5-24.9 kg/m2 who receive 25000 IU/day vitamin A for 4 months .
Dietary supplement: Vitamin A

25000 IU/day vitamin A 4 months

1 Cap/Day

1 cap placebo/day for 4 month
Placebo Comparator: obese/ placebo
obese individuals with body mass index greator than 30 kg/m2 who receive 1 cap placebo per day for 4 months .
Dietary supplement: Vitamin A

25000 IU/day vitamin A 4 months

1 Cap/Day

1 cap placebo/day for 4 month
Active Comparator: Obese/ vitamin A
obese individuals with body mass index greater than 30 kg/m2 who receive 25000 IU/day vitamin A for 4 months
Dietary supplement: Vitamin A

25000 IU/day vitamin A 4 months

1 Cap/Day

1 cap placebo/day for 4 month

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Time Frame
Complete Blood Count-diff
Time Frame: Change from baseline at 4 months
Change from baseline at 4 months
Serum HDL concentrations
Time Frame: Change from baseline at 4 months
Change from baseline at 4 months
Serum LDL concentrations
Time Frame: Change from baseline at 4 months
Change from baseline at 4 months
Serum total cholesterol concentrations
Time Frame: Change from baseline at 4 months
Change from baseline at 4 months
Serum Triglycerides concentrations
Time Frame: Change from baseline at 4 months
Change from baseline at 4 months
Serum SGOT concentrations
Time Frame: Change from baseline at 4 months
Change from baseline at 4 months
Serum SGPT concentrations
Time Frame: Change from baseline at 4 months
Change from baseline at 4 months
Serum T3 concentrations
Time Frame: Change from baseline at 4 months
Change from baseline at 4 months
Serum T4 concentrations
Time Frame: Change from baseline at 4 months
Change from baseline at 4 months
Serum TSH concentrations
Time Frame: Change from baseline at 4 months
Change from baseline at 4 months
Serum FBS concentrations
Time Frame: Change from baseline at 4 months
Change from baseline at 4 months
Serum CRP concentrations
Time Frame: Change from baseline at 4 months
Change from baseline at 4 months
Serum RF concentrations
Time Frame: Change from baseline at 4 months
Change from baseline at 4 months

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Time Frame
Serum IL-2 concentrations
Time Frame: Change from baseline at 4 months
Change from baseline at 4 months
Serum IL-6 concentrations
Time Frame: Change from baseline at 4 months
Change from baseline at 4 months
Serum IL-10 concentrations
Time Frame: Change from baseline at 4 months
Change from baseline at 4 months
Serum IL-12 concentrations
Time Frame: Change from baseline at 4 months
Change from baseline at 4 months
Serum IL-13 concentrations
Time Frame: Change from baseline at 4 months
Change from baseline at 4 months
Serum IL-17 concentrations
Time Frame: Change from baseline at 4 months
Change from baseline at 4 months
Seum IL-1β concentrations
Time Frame: Change from baseline at 4 months
Change from baseline at 4 months
Serum TGF β concentrations
Time Frame: Change from baseline at 4 months
Change from baseline at 4 months
serum IFN γ concentrations
Time Frame: Change from baseline at 4 months
Change from baseline at 4 months
serum Angiotensin П concentrations
Time Frame: Change from baseline at 4 months
Change from baseline at 4 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Tehran University of Medical Sciences

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
February 1, 2010

Primary Completion (Anticipated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
February 1, 2013

Study Completion (Anticipated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
August 1, 2013

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
February 14, 2011

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
July 28, 2011

First Posted (Estimate)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
July 29, 2011

Study Record Updates

Last Update Posted (Estimate)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
July 29, 2011

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
July 28, 2011

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
July 1, 2011

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 89-04-27-11869

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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