P2X7 receptor activation impairs exogenous MHC class I oligopeptides presentation in antigen presenting cells.
PLoS One
; 8(8): e70577, 2013.
Article
em En
| MEDLINE
| ID: mdl-23940597
ABSTRACT
Major histocompatibility complex class I (MHC I) on antigen presenting cells (APCs) is a potent molecule to activate CD8(+) T cells and initiate immunity. P2X7 receptors (P2X7Rs) are present on the plasma membrane of APCs to sense the extracellular danger signal adenosine-5'-triphosphate (ATP). P2X7R activates the inflammasome and the release of IL-1ß in macrophages and other immune cells to initiate the inflammatory response. Here we show that P2X7R stimulation by ATP in APCs decreased the amount of MHC I at the plasma membrane. Specific antagonism or genetic ablation of P2X7R inhibited the effects of ATP on levels of cellular MHC I. Furthermore, P2X7R stimulation was able to inhibit activation of CD8(+) T cells via specific MHC I-oligopeptide complexes. Our study suggests that P2X7R activation on APCs is a novel inhibitor of adaptive CD8(+) T cell immunity.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Oligopeptídeos
/
Genes MHC Classe I
/
Receptores Purinérgicos P2X7
/
Células Apresentadoras de Antígenos
Limite:
Animals
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article