Clinical Trial: Analysis of Osteoimmune Interactions Linking Inflammation and Bone Destruction in Aggressive Periodontitis

Study Status: Recruiting
Recruit Status: Recruiting
Study Type: Interventional

Official Title: Analysis of Osteoimmune Interactions Linking Inflammation and Bone Destruction in Aggressive Periodontitis

Brief Summary: Periodontitis are inflammatory diseases characterized by the destruction of the tooth-supporting bone due to increased bone resorption by osteoclasts (OCLs). Two forms are described: chronic periodontitis (CP) and aggressive periodontitis (AP) that differ by the severity and rapidity of bone loss, much more important for AP than CP. In both forms, the link with uncontrolled activation of the immune system is largely admitted. Despite the physiopathology of CP is fairly well studied, very few data are available regarding AP. The investigators aim is to understand the severity of AP by analyzing the proportion and action of immune and mesnchymal cells potentially involved in bone destruction, on biopsies of periodontal granulation tissue (surgical waste) and blood. Three groups of 20 patients will be included: affected with AP, CP or controls (necessitating an extraction of wisdom teeth).

Detailed Summary:

Context: Periodontitis are inflammatory diseases affecting the periodontium and characterized by the destruction of the tooth-supporting bone due to increased bone resorption by osteoclasts (OCLs). Two forms are described: chronic periodontitis (CP) and aggressive periodontitis (AP) that differ by the severity and rapidity of bone loss, much more important for AP than CP. In both forms, the link with uncontrolled activation of the immune system is largely admitted. But despite the physiopathology of CP is fairly well studied, very few data are available regarding AP. Based on the investigators previous studies, their hypothesis to explain this severity is the existence of a vicious circle involving immune cells, mesenchymal cells and OCLs, that would maintain and amplify inflammation and bone loss.

Study: this is a transversal, interventional and single-center study. It includes 3 groups of 20 patients: affected with AP, CP or controls (necessitating an extraction of wisdom teeth).

Aims: the investigators will compare the proportion of immune and mesenchymal cells in the 3 groups of patients to identify the populations potentially involved in bone destruction. The investigators will compare in vitro their capacity to induce OCL differentiation in order to determine their role in bone loss. The investigators will also compare the capacity of OCLs and mesenchymal cells to activate T cells, in order to determine their role in inflammation.

Methodology: patients will be recruited in the department of periodontology, CHU of Nice. After signing the informed consent, a biopsy of periodontal granulation tissue (surgical waste) will be collected during the usual treatment of these diseases, as well as a blood sample. Then, patients will leave the study. Cells from the biopsies will
Sponsor: Centre Hospitalier Universitaire de Nice

Current Primary Outcome: proportion of lymphocytes, myeloid and mesenchymal populations in the samples [ Time Frame: At the surgery time ]

determined by flow cytometry


Original Primary Outcome: Same as current

Current Secondary Outcome:

Original Secondary Outcome:

Information By: Centre Hospitalier Universitaire de Nice

Dates:
Date Received: November 15, 2013
Date Started: November 2013
Date Completion: November 2016
Last Updated: September 29, 2015
Last Verified: September 2015