Regulation of t cells by lag-3 (cd223)

C - Chemistry – Metallurgy – 07 – K

Patent

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C07K 19/00 (2006.01) A01N 43/04 (2006.01) A61K 31/70 (2006.01) A61K 31/7088 (2006.01) A61K 35/12 (2006.01) A61K 38/17 (2006.01) A61K 39/00 (2006.01) A61K 39/395 (2006.01) A61K 48/00 (2006.01) A61P 35/00 (2006.01) A61P 37/02 (2006.01) C07K 14/705 (2006.01) C07K 16/28 (2006.01) C12P 21/06 (2006.01) C12Q 1/00 (2006.01) G01N 33/53 (2006.01) G01N 33/566 (2006.01)

Patent

CA 2517287

Regulatory T cells (Treg) limit autoimmunity but can also attenuate the magnitude of anti-pathogen and anti-tumor immunity. Understanding the mechanism of Treg function and therapeutic manipulation of Treg in vivo requires identification of Treg selective receptors. A comparative analysis of gene expression arrays from antigen specific CD4+ T cells differentiating to either an effector/memory or a regulatory phenotype revealed Treg selective expression of LAG-3 (CD223), a CD4-related molecule that binds MHC class II. LAG-3 expression on CD4+ T cells correlates with the cells' in vitro suppressor activity, and ectopic expression of LAG-3 on CD4 T cells confers suppressor activity on the T cells. Antibodies to LAG-3 inhibit suppression both in vitro and in vivo. LAG-3 marks regulatory T cell populations and contributes to their suppressor activity.

Les lymphocytes T régulateurs (Treg) limitent l'autoimmunité mais peuvent aussi atténuer l'étendue de l'immunité antipathogène et antitumeur. Pour comprendre le mécanisme de la fonction des Treg et la manipulation thérapeutique des Treg in vivo, il faut identifier des récepteurs sélectifs de Treg. Une analyse comparative des séries d'expression génique résultant de lymphocytes T CD4+ spécifiques se différenciant soit en effecteur/mémoire soit en phénotype régulateur a révélé pour les Treg une expression sélective de LAG-3 (CD223), qui est une molécule apparentée à CD4 se liant avec le CMH de classe II. L'expression de LAG-3 sur les lymphocytes T CD4+ est corrélée avec le rôle suppresseur in vitro des cellules, et l'expression ectopique de LAG-3 sur les lymphocytes T CD4 confère un rôle suppresseur aux lymphocytes T. Les anticorps vis-à-vis de la LAG-3 inhibent la suppression à la fois in vitro et in vivo. La LAG-3 marque les populations de lymphocytes T régulateurs et contribue à leur rôle suppresseur.

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