Activation of the respiratory burst in murine phagocytes by certain guanine ribonucleosides modified at the 7 and 8 positions: possible involvement of a pertussis toxin-sensitive G-protein.
Immunol Lett
; 23(3): 173-8, 1990 Jan.
Article
en En
| MEDLINE
| ID: mdl-2106487
The capacity of certain guanine ribonucleosides (modified at the 7 and/or 8 positions) to enhance the respiratory burst of murine peritoneal phagocytes was evaluated. The results show that 8-mercaptoguanosine, 8-bromoguanosine, 7-methyl-8-oxoguanosine and 7-thia-8-oxoguanosine, when injected intraperitoneally into mice, induced peritoneal phagocytes to generate reactive oxygen species as early as 1 h after injection. In vivo administration of the nucleosides induced higher levels of phagocyte activation than in vitro treatment with the same nucleosides. However, the addition of interferon alpha/beta in vitro significantly increased the magnitude of phagocyte activation by the nucleosides, suggesting an important role for cytokines/lymphokines in the nucleoside-induced phagocyte activation in vivo. Furthermore, pre-treatment of phagocytes in vitro with Bordetella pertussis toxin, before treatment with the guanosines, inhibited their capacity to induce the respiratory burst. These observations establish these low-molecular-weight compounds as interesting probes for the study of stimulus-response coupling in phagocytes.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Fagocitos
/
Proteínas de Unión al GTP
/
Guanosina
Tipo de estudio:
Diagnostic_studies
Límite:
Animals
Idioma:
En
Revista:
Immunol Lett
Año:
1990
Tipo del documento:
Article
Pais de publicación:
Países Bajos