Study of the Frequency and of the Regulatory Function of Positive T Lymphocytes Dual CD4CD8aa (DP8a) Specific to a Bacteria of the Intestinal Microbiota (Faecalibacterium Prausnitzii) in Atopic Dermatitis, Asthma and Allergic Rhinitis (Prévall-DP)

Nantes University Hospital (NUH)

Status: Completed

Conditions: Atopic Dermatitis; Allergic Rhinitis; Allergic Asthma

Treatments: Genetic: double positive T cells (CD4 + / CD8 +) to the specific peripheral blood of F prauznitzii analyse

Study type: Observational

Funder types: Other

Identifiers

NCT02908360

RC14_0372

Details and patient eligibility

About

The prevalence of allergic diseases (atopic dermatitis, asthma, rhinitis, conjunctivitis and food allergy) has increased dramatically in industrialized countries over the last 20-30 years.

Allergic diseases are present especially in children and young adults, but all age groups are affected, with variations across countries and age. To propose new therapies, the investigators must first understand the physiopathology.

Since their discovery the regulatory T cells have continued to be the subject of work to understand their role in maintaining immune homeostasis in the human body but also their involvement in autoimmune diseases, inflammatory diseases, transplants of solid organs or fluids and allergic diseases.

It was identified two broad classes of regulatory T cells:

• T cells = natural regulators acquisition of a phenotype and a regulatory function right out of the thymus ( CD25 + / CD127 + low / FoxP3 +).
• T cells induced regulators = acquisition of a phenotype and a regulatory function on the periphery depending on the cytokine micro-environment.

Phenotypic characterization of these is less obvious and even more so than during the last ten years several induced regulatory T cell populations have been described ( eg, Tr1 ).

A new subpopulation of T cells induced in patients with inflammatory bowel disease recently identified have a particular phenotype as bearing the CD4 and CD8 double marking with a regulatory phenotype.

These regulatory T cells are also induced a specific of a commensal intestinal bacterium (Faecalibacterium prausnitzii).

Regarding allergies, it has been widely demonstrated a relationship between changes of the intestinal microbiota and the occurrence of allergic diseases.

The investigators would therefore propose a cross-sectional study, single-center, controlled, single blinded to study the role of T cells called double positive induced regulators DP8 to compare the frequency and the regulatory function of specific DP8 of Faecalibacterium prausnitzii in atopic dermatitis, asthma and allergic rhinitis compared to control samples.

Full description

The primary endpoint will be the highlight of a quantitative reduction of double positive T cells (CD4 + / CD8 +) the specific F prausnitzii peripheral blood in patients with allergic asthma, allergic rhinitis and atopic dermatitis compared to samples from a control sample collection made available by the laboratory BIOFORTIS® located near Nantes University of Nantes.

Enrollment: 56 patients

Sex: All

Ages: 18 to 70 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• non smoker
• BMI <30kg/m²
• No contraindication to prick-test
• Inform consent signed for genetics
• belong to a social security scheme
• patients with allergic rhinitis or atopic dermatitis or with allergic asthma

Exclusion criteria

• major or major incapable protected
• antimicrobial treatment (antibiotic, antifungal or antiviral)
• in contact with an MDR bacteria
• has received or is receiving specific immunotherapy
• History of cancer of the hematopoietic system
• antecedent acquired immune deficiency with HIV
• congenital immunodeficiency
• inflammatory bowel disease
• autoimmune disease and / or inflammatory
• solid organ transplant or hematopoietic cells
• addict
• pregnant or of childbearing age without effective contraception
• failure of acute or chronic severe organ
• hardly speak French and / or difficult to understand French

Trial design

56 participants in 3 patient groups

Patients with allergic rhinitis

Description:

Patients with rhinitis and / or allergic conjunctivitis duly diagnosed according to the ARIA criteria

Treatment:

Genetic: double positive T cells (CD4 + / CD8 +) to the specific peripheral blood of F prauznitzii analyse

Patients with atopic dermatitis

Description:

The patient has moderate classified atopic dermatitis (SCORAD 25 to 50) or severe (SCORAD\> 50).

Treatment:

Genetic: double positive T cells (CD4 + / CD8 +) to the specific peripheral blood of F prauznitzii analyse

Patients with allergic asthma

Description:

The patient has allergic asthma diagnosed according to the criteria GINA21

Treatment:

Genetic: double positive T cells (CD4 + / CD8 +) to the specific peripheral blood of F prauznitzii analyse