Catalyzes the hydrolytic deamination of adenosine and 2-deoxyadenosine (PubMed: 8452534, PubMed: 16670267). Plays an important role in purine metabolism and in adenosine homeostasis. Modulates signaling by extracellular adenosine, and so contributes indirectly to cellular signaling events. Acts as a positive regulator of T-cell coactivation, by binding DPP4 (PubMed: 20959412). Its interaction with DPP4 regulates lymphocyte-epithelial cell adhesion (PubMed: 11772392). Enhances dendritic cell immunogenicity by affecting dendritic cell costimulatory molecule expression and cytokines and chemokines secretion (By similarity). Enhances CD4+ T-cell differentiation and proliferation (PubMed: 20959412). Acts as a positive modulator of adenosine receptors ADORA1 and ADORA2A, by enhancing their ligand affinity via conformational change (PubMed: 23193172). Stimulates plasminogen activation (PubMed: 15016824). Plays a role in male fertility (PubMed: 21919946, PubMed: 26166670). Plays a protective role in early postimplantation embryonic development (By similarity).
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