Involvement and prognosis value of CD8(+) T cells in giant cell arteritis.
Fiche publication
Date publication
août 2016
Journal
Journal of autoimmunity
Auteurs
Membres identifiés du Cancéropôle Est :
Pr BONNOTTE Bernard, Dr FERRAND Christophe, Pr MARTIN Laurent, Dr QUIPOURT Valérie, Dr DEVILLIERS Hervé, Pr ORNETTI Paul
Tous les auteurs :
Samson M, Ly KH, Tournier B, Janikashvili N, Trad M, Ciudad M, Gautheron A, Devilliers H, Quipourt V, Maurier F, Meaux-Ruault N, Magy-Bertrand N, Manckoundia P, Ornetti P, Maillefert JF, Besancenot JF, Ferrand C, Mesturoux L, Labrousse F, Fauchais AL, Saas P, Martin L, Audia S, Bonnotte B
Lien Pubmed
Résumé
CD8(+) T cells participate in the pathogenesis of some vasculitides. However, little is known about their role in Giant Cell Arteritis (GCA). This study was conducted to investigate CD8(+) T cell involvement in the pathogenesis of GCA. Analyses were performed at diagnosis and after 3 months of glucocorticoid treatment in 34 GCA patients and 26 age-matched healthy volunteers. Percentages of CD8(+) T-cell subsets, spectratype analysis of the TCR Vβ families of CD8(+) T cells, levels of cytokines and chemokines and immunohistochemistry of temporal artery biopsies (TAB) were assessed. Among total CD8(+) T cells, percentages of circulating cytotoxic CD8 T lymphocytes (CTL, CD3(+)CD8(+)perforin(+)granzymeB(+)), Tc17 (CD3(+)CD8(+)IL-17(+)), CD63(+)CD8(+) T cells and levels of soluble granzymes A and B were higher in patients than in controls, whereas the percentage of Tc1 cells (CD3(+)CD8(+)IFN-γ(+)) was similar. Moreover, CD8(+) T cells displayed a restricted TCR repertoire in GCA patients. Percentages of circulating CTL, Tc17 and soluble levels of granzymes A and B decreased after treatment. CXCR3 expression on CD8(+) T cells and its serum ligands (CXCL9, -10, -11) were higher in patients. Analyses of TAB revealed high expression of CXCL9 and -10 associated with infiltration by CXCR3(+)CD8(+) T cells expressing granzyme B and TiA1. The intensity of the CD8 T-cell infiltrate in TAB was predictive of the severity of the disease. This study demonstrates the implication and the prognostic value of CD8(+) T-cells in GCA and suggests that CD8(+) T-cells are recruited within the vascular wall through an interaction between CXCR3 and its ligands.
Référence
J. Autoimmun.. 2016 Aug;72:73-83