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Journal Article
Research Support, U.S. Gov't, P.H.S.
Importance of MAPK pathways for microglial pro-inflammatory cytokine IL-1 beta production.
Neurobiology of Aging 2004 April
In Alzheimer's disease (AD), chronically activated glia contribute to neuronal dysfunction through production of neuroinflammatory molecules like interleukin (IL)-1beta. As a first step to address the signaling pathways important for pro-inflammatory cytokine induction, and whether different activators use distinct pathways, we tested the involvement of mitogen-activated protein kinase (MAPK) pathways in microglial IL-1beta production. Microglial cultures stimulated with lipopolysaccharide, S100B, or beta-amyloid showed rapid activation of three different MAPKs (p38, ERK1/2, and JNK) and a later increase in IL-1beta levels, consistent with a possible mechanistic relationship between MAPK and IL-1beta. To more directly test this possibility, we stimulated microglia in the presence of selective MAPK inhibitors, and found that inhibition of each of the three MAPK pathways inhibited IL-1beta production in a concentration-dependent manner. In addition, the relative importance of each MAPK to IL-1beta production depended on the activating stimulus. These data demonstrate that MAPK pathways are important for microglial IL-1beta production, and suggest that different glial activators use distinct sets of signaling pathways to induce the same disease-relevant end-point in microglia.
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