| Autor: |
H, de Wit, W H, Dokter, M T, Esselink, M R, Halie, E, Vellenga |
| Rok vydání: |
1993 |
| Předmět: |
|
| Zdroj: |
Experimental hematology. 21(6) |
| ISSN: |
0301-472X |
| Popis: |
Human adherent monocytes were studied with regard to the expression of granulocyte colony-stimulating factor (G-CSF) at mRNA and protein levels in response to lipopolysaccharide (LPS) and gamma-interferon (IFN-gamma) stimulation. Monocytes did not express G-CSF transcripts in response to IFN-gamma treatment. In contrast, monocytes exposed to IFN-gamma plus LPS showed a dose-dependent increase in G-CSF mRNA accumulation and protein secretion compared to LPS-stimulated monocytes. The augmented G-CSF mRNA expression in response to IFN-gamma plus LPS was the result of a slight increase in the G-CSF transcription rate (2.2-fold) and a more than 6-fold increase in the G-CSF mRNA half-life (20 minutes vs.120 minutes). In addition, it was shown that the effects of IFN-gamma on LPS-induced G-CSF protein secretion could be mimicked by the calcium ionophore A23187, suggesting that the Ca(2+)-dependent pathway might be triggered after binding of the ligand to the receptor. Finally, it was observed that the potentiating effects of IFN-gamma on LPS-induced G-CSF secretion could be blocked by interleukin-4 (IL-4). These data indicate that two cytokines produced by activated T cells have opposite effects on G-CSF production by human activated monocytes. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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