Abstract
Macrophages secrete inflammatory cytokines and mono-nitrogen oxide (NO), and play crucial roles in inflammation in early-stage rheumatoid arthritis (RA). This study investigated whether glucosamine hydrochloride (GlcN), a nonsteroidal anti-inflammatory agent (NSAID) widely used to treat arthritis, affects the expression of inflammatory cytokines via the unfolded protein response (UPR) in lipopolysaccharide (LPS)-stimulated mouse macrophages (RAW264.7 cells). Pretreatment with GlcN reduced the expression of inflammatory cytokines and inhibited cell differentiation. Moreover, GlcN treatment increased the expression of CHOP and BiP/Grp78, the UPR target genes, in the presence or absence of LPS. Indeed, knockdown of CHOP using siRNAs prevented the GlcN-mediated reduction of inflammatory cytokines in LPS-stimulated RAW264.7 cells. Finally, we found that GlcN-mediated induction of CHOP reduced the phosphorylation of JNK and NF-?B in LPS-stimulated RAW264.7 cells. Combined, these results suggest that the GlcN-mediated induction of CHOP negatively regulates the inflammatory response by modulating JNK and NF-?B in LPS-stimulated RAW264.7 cells.
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Jeong, M., Cho, J., Cho, WS. et al. The glucosamine-mediated induction of CHOP reduces the expression of inflammatory cytokines by modulating JNK and NF-κB in LPS-stimulated RAW264.7 cells. Genes & Genomics 31, 251–260 (2009). https://doi.org/10.1007/BF03191197
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DOI: https://doi.org/10.1007/BF03191197