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. Author manuscript; available in PMC: 2011 Feb 10.
Published in final edited form as: J Immunol. 2010 Aug 15;185(4):1993–1998. doi: 10.4049/jimmunol.1000108

FIGURE 1.

FIGURE 1

CD39 and CD73 on Tregs generate extracellular adenosine, which can engage ARs on Teffs, APCs, and myeloid cells. This aspect of Treg function would be dependent on the presence of the substrates (local ATP, ADP, and/or AMP), which accumulate as a consequence of inflammation, hypoxia, metabolic stress, and/or cell death.