title: Comparison of pyrimidine and purine nucleoside secretion and nucleoside kinase expression in resident and elicited peritoneal macrophages.
abstract: Thymidine was found in culture supernatants from both normal peritoneal macrophages and macrophages elicited in vivo with LPS under conditions in which there was no detectable TK activity. Abrogation of thymidine secretion was observed only when elicited macrophages were cultured in the presence of macrophage growth factor (MGF), whereas resident macrophages continued secreting under similar conditions. Similarly, TK activity was induced with MGF only in elicited, but not in resident, macrophages; LPS added in vitro failed to render resident macrophages susceptible to stimulation by MGF. Tests for adenosine and deoxyadenosine in macrophage supernatants proved that these nucleosides were not secreted by these cells. Although AK was consistently expressed in both resident and elicited macrophages, no significant dAK levels could be detected in either cell population. In contrast to TK, both purine nucleoside kinases could not be modulated or induced with MGF. The data indicate different reactivity to MGF by resident and elicited macrophages and a difference in pyrimidine vs purine nucleoside secretion as well as nucleoside kinase expression by these cells.
mesh_terms: D000818:Animals; D001202:Ascitic Fluid / Q000166:cytology; D002478:Cells, Cultured; D003070:Coformycin / Q000031:analogs & derivatives / Q000494:pharmacology; D003470:Culture Media; D005260:Female; D008070:Lipopolysaccharides / Q000494:pharmacology; D008264:Macrophages / Q000378:metabolism*; D051379:Mice; D009703:Nucleoside-Phosphate Kinase / Q000378:metabolism*; D015649:Pentostatin; D010770:Phosphotransferases / Q000378:metabolism*; D017853:Phosphotransferases (Alcohol Group Acceptor); D011684:Purine Nucleosides / Q000378:metabolism*; D011741:Pyrimidine Nucleosides / Q000378:metabolism*; D013937:Thymidine Kinase / Q000378:metabolism
chemical_list: D003470:Culture Media; D008070:Lipopolysaccharides; D011684:Purine Nucleosides; D011741:Pyrimidine Nucleosides; D003070:Coformycin; D015649:Pentostatin; D010770:Phosphotransferases; D017853:Phosphotransferases (Alcohol Group Acceptor); D013937:Thymidine Kinase; C020005:deoxyadenosine kinase; D009703:Nucleoside-Phosphate Kinase