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Blood, 15 February 2004, Vol. 103, No. 4, pp. 1391-1397.
Prepublished online as a Blood First Edition Paper on October 9, 2003; DOI 10.1182/blood-2003-06-1959.
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IMMUNOBIOLOGY
Role of adenosine receptors in regulating chemotaxis and cytokine production of plasmacytoid dendritic cells
Max Schnurr,
Tracey Toy,
Amanda Shin,
Gunther Hartmann,
Simon Rothenfusser,
Julia Soellner,
Ian D. Davis,
Jonathan Cebon, and
Eugene Maraskovsky
From the Ludwig Institute for Cancer Research, Melbourne Tumour Biology Branch, Austin and Repatriation Medical Centre, Heidelberg, Australia; and the Department of Internal Medicine, Division of Clinical Pharmacology, University of Munich, Germany.
Plasmacytoid dendritic cells (PDCs) are potent regulators of immune function and the major source of type I interferon (IFN) following viral infection. PDCs are found at sites of inflammation in allergic reactions, autoimmune disorders, and cancer, but the mechanisms leading to the recruitment of PDCs to these sites remain elusive. During inflammation, adenosine is released and functions as a signaling molecule via adenosine receptors. This study analyzes adenosine receptor expression and function in human PDCs. Adenosine was found to be a potent chemotactic stimulus for immature PDCs via an A1 receptor–mediated mechanism. The migratory response toward adenosine was comparable to that seen with CXCL12 (stromal-derived factor-1 [SDF-1), the most potent chemotactic stimulus identified thus far for immature PDCs. Upon maturation, PDCs down-regulate the A1 receptor, resulting in a loss of migratory function. In contrast, mature PDCs up-regulate the A2a receptor, which is positively coupled to adenylyl cyclase and has been implicated in the down-regulation of DC cytokine-producing capacity. We show that in mature PDCs adenosine reduces interleukin-6 (IL-6), IL-12, and IFN- production in response to CpG oligodeoxynucleotides (ODN). These findings indicate that adenosine may play a dual role in PDC-mediated immunity by initially recruiting immature PDCs to sites of inflammation and by subsequently limiting the extent of the inflammatory response induced by mature PDCs by inhibiting their cytokine-producing capacity.
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