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The role of p38- and extracellular signal-regulated kinase (ERK) mitogen-activated protein (MAP) kinase pathways in the up-regulation of inducible nitric oxide synthase (iNOS) and tumor necrosis factor (TNF) production in macrophages stimulated with Streptococcus pneumoniae was examined. Inhibitors of p38 kinases effected significant decreases in the accumulation of iNOS protein in macrophages challenged with pneumococcal cell wall preparations or antibiotic-killed pneumococci, even when added up to 6 h after bacterial challenge. In contrast, ERK pathway inhibitors failed to inhibit pneumococcus-induced iNOS protein accumulation. ERK pathway inhibitors significantly reduced TNF secretion when added at the same time as pneumococcal challenge, and inhibitors of both ERK and p38 pathways reduced TNF secretion when added to the macrophages 1 h before stimulation. These data confirm the importance of the p38 and ERK MAP kinase pathways in macrophage activation by bacterial products but indicate that these 2 kinase pathways regulate different macrophage responses in a temporally distinct manner.

the journal of infectious diseases (online. university of chicago press)/the journal of infectious diseases

Differential Effects of p38‐ and Extracellular Signal–Regulated Kinase Mitogen–Activated Protein Kinase Inhibitors on Inducible Nitric Oxide Synthase and Tumor Necrosis Factor Production in Murine Macrophages Stimulated with<i>Streptococcus pneumoniae</i>

Differential Effects of p38‐ and Extracellular Signal–Regulated Kinase Mitogen–Activated Protein Kinase Inhibitors on Inducible Nitric Oxide Synthase and Tumor Necrosis Factor Production in Murine Macrophages Stimulated withStreptococcus pneumoniae