title: Stimulation of the trypanocidal and endoribonuclease activities by the interferon induced (2'-5') oligoadenylates.
abstract: Interferon or 2'-5' oligoadenylates (2'-5' An) activated the microbicidal activity of primary cultures of rat glia cells and of the mouse macrophage transformed cell line J774 against infection by Trypanosoma cruzi. Pretreatment with gamma-interferon (gamma-IFN) or 2'-5' A3 of rat glia cells or direct addition of these compounds during the incubation with the parasite enhanced the uptake of metacyclic trypanosomes by the cells. Furthermore, glia cells treated with gamma-IFN or 2'-5' A3 were able to restrict the growth and to eventually destroy intracellular amastigotes. Bacterial lipopolysaccharide (LPS) synergized with gamma-IFN as well as with 2'-5' A3 and 2'-5' A4, but not with dephosphorylated 'core' molecules or ATP, to induce a partial trypanocidal activity in J774 cells. In addition, those treatments with gamma-IFN or 2'-5' A3 activated to a similar extent an endoribonuclease, which degraded ribosomal RNA, in rat glia cells, suggesting a role of this enzyme in the mechanism of the trypanocidal activity of gamma-IFN.
mesh_terms: D000227:Adenine Nucleotides / Q000494:pharmacology*; D000818:Animals; D002460:Cell Line; D002478:Cells, Cultured; D004722:Endoribonucleases / Q000378:metabolism; D004789:Enzyme Activation / Q000187:drug effects; D007371:Interferon-gamma / Q000494:pharmacology*; D008264:Macrophages / Q000187:drug effects* / Q000276:immunology / Q000469:parasitology; D051379:Mice; D009457:Neuroglia / Q000187:drug effects* / Q000201:enzymology / Q000276:immunology / Q000469:parasitology; D009843:Oligoribonucleotides / Q000494:pharmacology*; D010587:Phagocytosis / Q000187:drug effects; D012313:RNA / Q000378:metabolism; D051381:Rats; D014349:Trypanosoma cruzi / Q000276:immunology*
chemical_list: D000227:Adenine Nucleotides; D009843:Oligoribonucleotides; C023505:2',5'-oligoadenylate; D012313:RNA; D007371:Interferon-gamma; D004722:Endoribonucleases; C031956:2-5A-dependent ribonuclease