The Role of the Thymus in Type I Diabetes. (TregDiab)

March 30, 2020 updated by: University Hospital, Toulouse

Thymic Generation of Regulatory T Lymphocytes in Type I Diabetes Patients.

Regulatory T lymphocytes play a major role in the protection from autoimmune pathology. Defects in immunosuppression mediated by these cells is therefore suspected to contribute to these diseases. This issue has very little been studied in humans.Regulatory T cells emigrated from the thymus will be isolated from the blood of patients and healthy controls. The repertoire of antigen-receptors will be analysed by high throughput sequencing and its diversity estimated using appropriate statistical models borrowed from ecology.

Study Overview

Status

Withdrawn

Conditions

Intervention / Treatment

Detailed Description

In the thymus of an animal model of type I diabetes, the population of regulatory T cells expresses a repertoire of antigen receptors that is approximately ten-fold less diverse than that found in mice resistant to autoimmune pathology. Genetic models later showed that this reduced diversity was involved in the susceptibility to diabetes. Researchers study the diversity of the TCR expressed by regulatory T cells from paediatric type I diabetes patients and controls. Regulatory T cells emigrated from the thymus will be isolated from the blood of patients and healthy controls. The repertoire of antigen-receptors will be analysed by high throughput sequencing and its diversity estimated using appropriate statistical models borrowed from ecology.

Study Type

Interventional

Phase

  • Not Applicable

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

  • France
    • Midi-Pyrénées
      • Toulouse, Midi-Pyrénées, France, 31059
        • Chu de Toulouse

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

Ages Eligible for Study

6 years to 12 years (Child)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • type I diabetes patient
  • having at least one age-matched sibling (healthy control)

Exclusion Criteria:

  • other immunopathology
  • treatment with any anti-inflammatory or immunosuppressive drugs
  • puberty
  • legal protection

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: Basic Science
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Patients with diabetes
T1D patients with blood collection
Procedure: Blood collection
Ten cc of peripheral blood will be taken from patients and healthy controls as soon as possible after T1D diagnosis of the former.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Variability of the diversity of antigen-receptors' repertoires, expressed by regulatory T cells from type I diabetes patients and healthy controls.
Time Frame: Day 1
Treg from the pediatric patients and the control subjects' blood will be isolated by cytometry, the messenger ribonucleic acid (mRNA) of these cells will be isolated, and the analysis of the alpha and beta chains of the TCRs will be carried out by high-throughput sequencing.
Day 1

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Ratio between TCR diversities expressed by Treg cells vs. conventional T cells.
Time Frame: Day 1
Treg from the pediatric patients and the control subjects' blood will be isolated by cytometry, the mRNA of these cells will be isolated, and the analysis of the alpha and beta chains of the TCRs will be carried out by high-throughput sequencing.
Day 1

Collaborators and Investigators

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

Sponsor

University Hospital, Toulouse

Collaborators

Institut National de la Santé Et de la Recherche Médicale, France
Centre National de la Recherche Scientifique, France

Investigators

  • Principal Investigator: Claire Le Tallec, MD, CHU Toulouse

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

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 (Anticipated)

March 1, 2018

Primary Completion (Anticipated)

March 1, 2019

Study Completion (Anticipated)

March 1, 2019

Study Registration Dates

First Submitted

July 28, 2017

First Submitted That Met QC Criteria

July 28, 2017

First Posted (Actual)

August 2, 2017

Study Record Updates

Last Update Posted (Actual)

April 1, 2020

Last Update Submitted That Met QC Criteria

March 30, 2020

Last Verified

March 1, 2020

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • RC31/16/8254

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

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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