View clinical trials related to Horton's Disease.
Filter by:Giant cell arteritis (GCA) is the most frequent vascularitis after 50 years of age The investigators recently showed that GCA was accompanied by an elevation in Th1 and Th17 response [1]. Even though a quantitative deficit in regulatory TL (Treg) was shown, there are to date no data concerning their precise phenotypic and functional characteristics and notably their ability to inhibit Th1 and Th17 polarisation. The hypothesis of the investigator is that, in GCA, there is quantitative and above all functional deficit of Treg. Recently, progress has been made in the identification of Treg with new markers (CD39), which will make it possible to better identify and to study their specific functions. In this study the phenotypic and functional characteristics of Treg in GCA will be analysed. Better understanding of the role des Treg in GCA should lead to better-targeted treatments for patients with GCA, notably via the blockage of cytokines that inhibit the differentiation and/or function of Treg. The study is classified interventional because a lot of blood samples are taken.
The research hypothesis is that T lymphocytes CD8 play a role in the physiopathology of Horton's disease. At the inclusion visit, patients will have, as is the case in the usual strategy: - A complete clinical examination carried out by the doctor in charge of the patient - ESR, and CRP and fibrinogen assay - A full blood count for leukocytes and lymphocytes - A biopsy of the temporal artery (TAB) to screen for signs of vascularitis, suggesting Horton's disease. The clinician in charge of the patient will decide if a second biopsy is necessary. The biopsy will be sent to and analysed at Anatomy and Pathological cytology service. Immunohistochemical analyses will be done if the TAB is positive. In addition to the standard clinical examination and complementary examinations relative to the patients' pathology, the following will be done: - Lymphocyte immunophenotyping for the quantity of T CD4 (cluster of differentiation 4) and CD8 lymphocytes, B lymphocytes and natural killer lymphocytes. This will make it possible to calculate the absolute value for different T lymphocyte populations. - A blood sample drawn into a dry 5 mL tube (large yellow) to isolate the serum, which will be stored at -80°C for future assays for cytokines and other biomarkers of interest for Horton's disease. - 16 blood samples drawn into 6 mL heparinized tubes (large green). These will be used immediately for cytometric and functional analyses.
The aim of this open, controlled, multicentre biomedical research study is to identify new markers specifically associated with Horton's disease. This would make it possible to improve the diagnosis and management of this disease. Participation consists in taking one or several blood samples depending on the group patients/controls.