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Adenosine and cAMP signalling skew human dendritic cell differentiation towards a tolerogenic phenotype with defective CD8 + T‐cell priming capacity
Author(s) -
Challier John,
Bruniquel Denis,
Sewell Andrew K.,
Laugel Bruno
Publication year - 2013
Publication title -
immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.297
H-Index - 133
eISSN - 1365-2567
pISSN - 0019-2805
DOI - 10.1111/imm.12053
Subject(s) - priming (agriculture) , biology , microbiology and biotechnology , dendritic cell , immune system , adenosine , peripheral tolerance , cd8 , cytotoxic t cell , t cell , acquired immune system , immune tolerance , immunology , in vitro , biochemistry , botany , germination
Summary Multiple endogenous mechanisms that regulate immune and inflammatory processes contribute to the maintenance of peripheral tolerance and prevent chronic inflammation in mammals. Yet pathogens and tumours are able to exploit these homeostatic pathways to foster immunosuppressive microenvironments and evade immune surveillance. The release of adenosine in the extracellular space contributes to these phenomena by exerting a broad range of immunomodulatory effects. Here we document the influence of adenosine receptor triggering on human dendritic cell differentiation and functions. We show that the expression of several immunomodulatory proteins and myeloid/monocytic lineage markers was affected by adenosine receptors and the cAMP pathway. These changes were reminiscent of the phenotype associated with tolerogenic dendritic cells and, functionally, translated into a defective capacity to prime CD 8 + T ‐cells with a common tumour antigen in vitro . These results establish a novel mechanism by which adenosine hampers CD 8 + T ‐cell immunity via dendritic cells that may contribute to peripheral tolerance as well as to the establishment of immunosuppressive microenvironments relevant to tumour biology.