Activation of Adenosine A(3) Receptors Potentiates Stimulatory Effects of IL-3, SCF, and GM-CSF on Mouse Granulocyte-Macrophage Hematopoietic Progenitor Cells
Adenosine A(3) receptor agonist N-6-(3-iodobenzyl)adenosine-5'-N-methyluronamide (IB-MECA) has been tested from the point of view of potentiating the effects of hematopoietic growth factors interleukin-3 (IL-3), stem cell factor (SCF), granulocyte-macrophage colony-stimulating factor (GM-CSF), and granulocyte colony-stimulating factor (G-CSF) on the growth of hematopoietic progenitor cells for granulocytes and macrophages (GM-CFC) in suspension of normal mouse bone marrow cells in vitro. IB-MECA alone induced no GM-CFC growth. Significant elevation of numbers of GM-CFC evoked by the combinations of IB-MECA with IL-3, SCF, or GM-CSF as compared with these growth factors alone has been noted. Combination of IB-MECA with G-CSF did not induce significantly higher numbers of GM-CFC in comparison with G-CSF alone. Joint action of three drugs, namely of IB-MECA + IL-3 + GM-CSF, produced significantly higher numbers of GM-CFC in comparison with the combinations of IB-MECA + IL-3, IB-MECA + GM- CSF, or IL-3 + GM-CSF. These results give evidence of a significant role of selective activation of adenosine A3 receptors in stimulation of the growth of granulocyte/macrophage hematopoietic progenitor cells.