Abstract
Gold sodium thiomalate (GST), chloroquine (CQ), and metho- trexate have been widely used in the therapy of rheumatoid arthritis and other inflammatory conditions. Using the human monocytic cell line THP-1 we have analyzed effects of these drugs on cytokine production and intracellular signaling. GST and CQ were equally effective in reducing lipopolysaccharide (LPS)-induced IL-1β release while CQ was a more effective inhibitor of TNF-α production than GST. Methotrexate did not affect production of these cytokines. CQ reduced IL-1β mRNA expression and strongly inhibited phosphorylation of mitogen-activated protein kinase (MAPK) p38, and to a lesser extent c-Jun N-terminal kinase and extracellular signal-regulated kinase 1/2. In contrast, GST did not affect cytokine mRNA expression or MAPK activation. However, GST selectively inhibited the activity of the interleukin-1 converting enzyme (ICE)/caspase-1. These data demonstrate that CQ inhibits IL-1β release from monocytes by interfering with pretranscriptional signaling and TNF-α release by posttranslational events whereas GST downregulates IL-1β secretion by interfering with posttranslational IL-1β processing.
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Seitz, M., Valbracht, J., Quach, J. et al. Gold Sodium Thiomalate and Chloroquine Inhibit Cytokine Production in Monocytic THP-1 Cells Through Distinct Transcriptional and Posttranslational Mechanisms. J Clin Immunol 23, 477–484 (2003). https://doi.org/10.1023/B:JOCI.0000010424.41475.17
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DOI: https://doi.org/10.1023/B:JOCI.0000010424.41475.17