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ADP-ribosylation is involved in nuclear factor κB (NF-κB)-dependent gene expression induced by lipopolysaccharide in murine macrophages. Here we have investigated the mechanism by which ADP-ribosylation inhibitors block signaling pathways induced in macrophages. In RAW264.7 macrophages the inducers of NF-κB activate the production of reactive oxygen species and three mitogenactivated protein kinases (MAPK), the extracellular signal regulated kinase (ERK), the c-jun N-terminal kinase/stress-activated protein kinase (JNK), and p38. We demonstrate that ADP-ribosylation inhibitors specifically inhibit ERK MAPK activation and reduce the release of inflammatory mediators such as tumor necrosis factor α (TNF-α), IL-6 and nitrite.

biological chemistry

Modulation of the Activation of Extracellular Signal-Regulated Kinase (ERK) and the Production of Inflammatory Mediators by ADP-Ribosylation Inhibitors