Role of the P2Y12 receptor in the modulation of murine dendritic cell function by ADP.
The effects of ADP on the biology of dendritic cells have been studied much less than those of ATP or adenosine. In this study, we showed that adenosine-5'-O-(2-thiodiphosphate) (ADPβS) induced intracellular Ca(2+) transients in murine dendritic cells (DCs). This effect was abolished by AR-C69931MX, a dual P2Y(12) and P2Y(13) receptor antagonist. RT-PCR experiments revealed the expression of both P2Y(12) and P2Y(13) mRNA in DCs. The Ca(2+) response to ADPβS was maintained in P2Y(13)-deficient DCs, whereas it was abolished completely in P2Y(12)(-/-) DCs. ADPβS stimulated FITC-dextran and OVA capture in murine DCs through macropinocytosis, and this effect was abolished in P2Y(12)(-/-) DCs. ADPβS had a similar effect on FITC-dextran uptake by human monocyte-derived DCs. OVA loading in the presence of ADPβS increased the capacity of DCs to stimulate OVA-specific T cells, whereas ADPβS had no effect on the ability of DCs to stimulate allogeneic T cells. Moreover, after immunization against OVA, the serum level of anti-OVA IgG1 was significantly lower in P2Y(12)(-/-) mice than that in wild-type controls. In conclusion, we have shown that the P2Y(12) receptor is expressed in murine DCs and that its activation increased Ag endocytosis by DCs with subsequent enhancement of specific T cell activation.
Ben Addi
Abduelhakem
A
Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire, Université Libre de Bruxelles, Gosselies, Belgium.
Cammarata
Dorothée
D
Conley
Pamela B
PB
Boeynaems
Jean-Marie
JM
Robaye
Bernard
B
D000244:Adenosine Diphosphate / Q000031:analogs & derivatives* / Q000276:immunology / Q000378:metabolism; D000818:Animals; D017951:Antigen Presentation / Q000276:immunology; D003713:Dendritic Cells / Q000276:immunology* / Q000378:metabolism; D004705:Endocytosis / Q000276:immunology; D006801:Humans; D008213:Lymphocyte Activation / Q000276:immunology; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D058925:Receptors, Purinergic P2Y12 / Q000276:immunology* / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013601:T-Lymphocytes / Q000276:immunology; D013873:Thionucleotides / Q000276:immunology* / Q000378:metabolism
C548577:P2ry12 protein, mouse; D058925:Receptors, Purinergic P2Y12; D013873:Thionucleotides; C030812:adenosine 5'-O-(2-thiodiphosphate); D000244:Adenosine Diphosphate