title: Activation of adenosine A(3) receptors supports hematopoiesis-stimulating effects of granulocyte colony-stimulating factor in sublethally irradiated mice.
abstract: OBJECTIVE
  Research areas of 'post-exposure treatment' and 'cytokines and growth factors' have top priority among studies aimed at radiological nuclear threat countermeasures. The experiments were aimed at testing the ability of N(6)-(3-iodobenzyl)adenosine-5'-N-methyluronamide (IB-MECA), an adenosine A(3) receptor agonist, to modulate hematopoiesis in sublethally irradiated mice, when administered alone or in a combination with granulocyte colony-stimulating factor (G-CSF) in a two-day post-irradiation treatment regimen.
  
  
  METHODS
  A complete analysis of hematopoiesis including determination of numbers of bone marrow hematopoietic progenitor and precursor cells, as well as of numbers of peripheral blood cells, was performed. The outcomes of the treatment were assessed at days 3 to 22 after irradiation.
  
  
  RESULTS
  IB-MECA alone has been found to induce a significant elevation of numbers of bone marrow granulocyte-macrophage progenitor cells (GM-CFC) and peripheral blood neutrophils. IB-MECA given concomitantly with G-CSF increased significantly bone marrow GM-CFC and erythroid progenitor cells (BFU-E) in comparison with the controls and with animals administered each of the drugs alone.
  
  
  CONCLUSIONS
  The findings suggest the ability of IB-MECA to stimulate hematopoiesis and to support the hematopoiesis-stimulating effects of G-CSF in sublethally irradiated mice.
authors.affiliation: Research Group of Experimental Hematology, Institute of Biophysics, v.v.i., Academy of Sciences of the Czech Republic, Brno, Czech Republic. hofer@ibp.cz
authors.forename: Michal
authors.initials: M
authors.lastname: Hofer
authors.forename: Milan
authors.initials: M
authors.lastname: Pospísil
authors.forename: Ludek
authors.initials: L
authors.lastname: Sefc
authors.forename: Ladislav
authors.initials: L
authors.lastname: Dusek
authors.forename: Antonín
authors.initials: A
authors.lastname: Vacek
authors.forename: Jirina
authors.initials: J
authors.lastname: Holá
authors.forename: Zuzana
authors.initials: Z
authors.lastname: Hoferová
authors.forename: Denisa
authors.initials: D
authors.lastname: Streitová
mesh_terms: D000241:Adenosine / Q000031:analogs & derivatives / Q000494:pharmacology; D000818:Animals; D015672:Erythroid Precursor Cells / Q000528:radiation effects; D016179:Granulocyte Colony-Stimulating Factor / Q000097:blood / Q000494:pharmacology*; D006410:Hematopoiesis / Q000187:drug effects*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D043684:Receptor, Adenosine A3 / Q000502:physiology*; D014916:Whole-Body Irradiation
chemical_list: D043684:Receptor, Adenosine A3; D016179:Granulocyte Colony-Stimulating Factor; C084956:N(6)-(3-iodobenzyl)-5'-N-methylcarboxamidoadenosine; D000241:Adenosine