Abstract
This study examines the mechanism of interleukin-10 (IL-10)-mediated suppression of KC chemokine gene expression in mouse macrophages. Suppression of KC mRNA levels by IL-10 occurred late in the time course of response to lipopolysaccharide (LPS). Equivalent IL-10-mediated suppression was observed when the agent was added 1 h before, simultaneous with, or 1 h after LPS. IL-10 did not inhibit KC gene transcription but rather produced a decrease in the stability of KC mRNA. The suppressive action of IL-10 was prevented in macrophages that were also treated with inhibitors of protein synthesis even when added 2 h after LPS and IL-10. These results suggest that IL-10 acts to destabilize LPS-induced KC mRNA through a process that depends on coincident KC mRNA translation.
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