Impact of Anti-Tumor Necrosis Factor (TNF) Antibodies on the T-lymphocyte and Macrophage Cooperation in Crohn Disease

Centre Hospitalier Universitaire de Nice

Status: Terminated

Conditions: Crohn Disease

Treatments: Procedure: rectosigmoïdal biopsies

Study type: Interventional

Funder types: Other

Identifiers

NCT00561548

06 - PP - 2006

2006-006877-26

Details and patient eligibility

About

The aim of this research is to study Crohn disease patients before and after anti-TNF, the cooperation between lamina propria T-lymphocytes and macrophages, through the expression of co-signalisation molecules and their ligands, the production of cytokines participating in this cooperation, and the potential role of regulatory T lymphocytes.

Full description

Crohn disease is an inflammatory disease and its frequency has been increasing over the last 25 years. The physiopathology involves a failure in the negative regulatory mechanisms of the inflammatory responses in the intestines, along with an excessive production of TNF-α by T-lymphocytes and macrophages of the lamina propria.

Anti-TNF-α antibodies usually give good therapeutic results, in particular in patients who are resistent or dependant on steroids. Nevertheless, in Crohn disease, the destructive T-lymphocytes - macrophage interactions, their inhibition by anti-TNFα, and the impact of these antibodies on cellular signaling remain largely unknown.

Two groups of 10 patients with active Crohn disease, with or without azathioprine, and requiring the start of anti-TNF treatment are included in this study. Rectosigmoïdal biopsies and blood tests will be done before starting the treatment and after 10 weeks of treatment. Surface antigens, cytokines and cellular molecules and the number of apoptotic cells will be analyzed by FACS, and the quantification of RNA will be analyzed by RT-PCR.

This will therefore enable us to study, before and after anti-TNF-α, in patients treated or not with azathioprine, on intestinal and blood lymphocytes, the production of cytokines involved in the lymphocyte-macrophage interaction, and the potential role of regulatory T cells.

Enrollment: 20 estimated patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• patient older than 18
• social security
• active Crohn disease defined by a CDAI > 250
• sigmoïdal and/or rectal lesions
• requiring treatment by infliximab
• having never received any anti-TNF treatment
• a negative pregnancy test for women
• prescription of efficient contraception for women, having started at least a month before beginning the study, and throughout the duration of the study
• acceptance to participate in this research and having signed the consent form
• not participating in any other study

Exclusion criteria

• consent withdrawal
• the halt of infliximab treatment

Trial design

Primary purpose: Basic Science

Allocation: Non-Randomized

Interventional model: Single Group Assignment

Masking: None (Open label)

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20 participants in 2 patient groups

A

Other group

Description:

Patients with active Crohn disease and with azathioprine treatment

Treatment:

Procedure: rectosigmoïdal biopsies

B

Other group

Description:

Patient with active crohn disease and without azathioprine disease

Treatment:

Procedure: rectosigmoïdal biopsies