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).