title: The pharmacological activation of adenosine A1 and A 3 receptors does not modulate the long- or short-term repopulating ability of hematopoietic stem and multipotent progenitor cells in mice.
abstract: This study continues our earlier findings on the hematopoiesis-modulating effects of adenosine A1 and A3 receptor agonists that were performed on committed hematopoietic progenitor and precursor cell populations. In the earlier experiments, N (6)-cyclopentyladenosine (CPA), an adenosine A1 receptor agonist, was found to inhibit proliferation in the above-mentioned hematopoietic cell systems, whereas N (6)-(3-iodobenzyl)adenosine-5'-N-methyluronamide (IB-MECA), an adenosine A3 receptor agonist, was found to stimulate it. The topic of this study was to evaluate the possibility that the above-mentioned adenosine receptor agonists modulate the behavior of early hematopoietic progenitor cells and hematopoietic stem cells. Flow cytometric analysis of hematopoietic stem cells in mice was employed, as well as a functional test of hematopoietic stem and progenitor cells (HSPCs). These techniques enabled us to study the effect of the agonists on both short-term repopulating ability and long-term repopulating ability, representing multipotent progenitors and hematopoietic stem cells, respectively. In a series of studies, we did not find any significant effect of adenosine agonists on HSPCs in terms of their numbers, proliferation, or functional activity. Thus, it can be concluded that CPA and IB-MECA do not significantly influence the primitive hematopoietic stem and progenitor cell pool and that the hematopoiesis-modulating action of these adenosine receptor agonists is restricted to more mature compartments of hematopoietic progenitor and precursor cells.
authors.affiliation: Laboratory of Experimental Hematology, Institute of Biophysics, vvi, Academy of Sciences of the Czech Republic, Brno, Czech Republic.
authors.forename: Michal
authors.initials: M
authors.lastname: Hofer
authors.forename: Milan
authors.initials: M
authors.lastname: Pospíšil
authors.forename: Zuzana
authors.initials: Z
authors.lastname: Hoferová
authors.forename: Denisa
authors.initials: D
authors.lastname: Komůrková
authors.forename: Petr
authors.initials: P
authors.lastname: Páral
authors.forename: Filipp
authors.initials: F
authors.lastname: Savvulidi
authors.forename: Luděk
authors.initials: L
authors.lastname: Sefc
mesh_terms: D000818:Animals; D005434:Flow Cytometry; D006410:Hematopoiesis / Q000187:drug effects / Q000502:physiology*; D006412:Hematopoietic Stem Cells / Q000187:drug effects / Q000502:physiology*; D051379:Mice; D008810:Mice, Inbred C57BL; D039902:Multipotent Stem Cells / Q000187:drug effects / Q000502:physiology*; D058906:Purinergic P1 Receptor Agonists / Q000494:pharmacology; D043682:Receptor, Adenosine A1 / Q000378:metabolism*; D043684:Receptor, Adenosine A3 / Q000378:metabolism*
chemical_list: D058906:Purinergic P1 Receptor Agonists; D043682:Receptor, Adenosine A1; D043684:Receptor, Adenosine A3