Adenosines, endogenous purine nucleosides, appear in the extracellular space under metabolically stressful conditions associated with ischemia, inflammation, and cell damage. Their activity on innate immunity is prevalently inhibitory and can develop both in infectious and neoplastic diseases. During cancer development, tumor cells that release high concentrations of adenosines can impair the function of tumor-infiltrating lymphocytes and assist tumor growth by neo-angiogenesis. We evaluated the influence of A(2) adenosine receptor (A(2)AR) agonist on cytotoxic-cell response comparing human with other mammalian species (rodents, pigs, goats), both in healthy and in cancer conditions. The A(2)AR agonist developed dose-dependent inhibition of the cytotoxic activity of immune effector cells in all studied species. However, variability of the response was observed in relation to the species and the target cells that were used. Altogether, our data indicate that the A(2)AR plays a central role in adenosine-mediated inhibition of immune response to tumors.

• MeSH
• Adenosine analogs & derivatives   immunology   pharmacology   MeSH
• Adenosine A2 Receptor Agonists * MeSH
• Killer Cells, Natural drug effects   immunology   MeSH
• Cytotoxicity, Immunologic drug effects   MeSH
• Rodentia MeSH
• Goats MeSH
• Rats MeSH
• Cells, Cultured MeSH
• Humans MeSH
• Mice, Inbred C57BL MeSH
• Mice MeSH
• Neoplasms immunology   MeSH
• Rats, Wistar MeSH
• Swine MeSH
• Receptors, Adenosine A2 immunology   MeSH
• Animals MeSH
• Check Tag
• Rats MeSH
• Humans MeSH
• Male MeSH
• Mice MeSH
• Female MeSH
• Animals MeSH
• Publication type
• Journal Article MeSH
• Research Support, Non-U.S. Gov't MeSH
• Names of Substances
• Adenosine MeSH
• Adenosine A2 Receptor Agonists * MeSH
• N-cyclopropyl adenosine-5'-carboxamide MeSH Browser
• Receptors, Adenosine A2 MeSH