Abstract
Objective and design
The anti-inflammatory effect of methyl-1-hydroxy-2-naphthoate (MHNA), a novel naphthol derivative, was evaluated in the lipopolysaccharide (LPS)-induced inflammatory response in murine macrophages.
Materials and methods
The release of nitric oxide (NO), interleukin-1beta (IL-1β) and interleukin-6 (IL-6) were detected by the Griess reagent and ELISA methods. The protein expressions of inducible NO synthase (iNOS) and cyclooxygenase-2 (COX-2) were examined by Western blotting. The mRNA expressions of IL-1β, IL-6, iNOS and COX-2 were determined by real-time PCR. Activation of mitogen-activated protein kinases (MAPKs) and nuclear factor kappa B (NF-κB) pathways were detected by Western blotting, reporter gene assay and electrophoretic mobility shift assay.
Results
MHNA significantly inhibited the release of NO, IL-1β and IL-6 as well as the protein expression of iNOS and COX-2 in LPS-stimulated macrophages. It also inhibited the mRNA expression of iNOS, COX-2, IL-1β and IL-6. Further studies indicated that MHNA inhibited LPS-induced increases in NF-κB DNA-binding activity and NF-κB transcriptional activity as well as IκB-α degradation and NF-κB translocation in a dose-dependent manner. Meanwhile, the activation of p38 MAPK and c-Jun N-terminal kinases (JNK) induced by LPS were decreased by MHNA.
Conclusions
MHNA inhibits the LPS-induced inflammatory response in murine macrophages via suppression of NF-κB and MAPKs signaling pathways activation.
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Abbreviations
- COX-2:
-
Cyclooxygenase-2
- EMSA:
-
Electrophoretic mobility shift assay
- ERK:
-
Extracellular signal-regulated kinases
- iNOS:
-
Inducible nitric oxide synthase
- IκB:
-
Inhibitory kappa B
- IL-1β:
-
Interleukin-1beta
- IL-6:
-
Interleukin-6
- JNK:
-
c-Jun N-terminal kinases
- LPS:
-
Lipopolysaccharide
- MAPKs:
-
Mitogen-activated protein kinases
- NO:
-
Nitric oxide
- NF-κB:
-
Nuclear factor kappa B
- PGE2 :
-
Prostaglandin E2
- TNF-α:
-
Tumor necrosis factor alpha
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Acknowledgments
This work was supported by grants from the Science and Technology Bureau of Guangzhou (2006Z1-E6021).
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Responsible Editor: Liwu Li.
Jun-Yan Zhang and Hong Jin contributed equally to this work.
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Zhang, JY., Jin, H., Wang, GF. et al. Methyl-1-hydroxy-2-naphthoate, a novel naphthol derivative, inhibits lipopolysaccharide-induced inflammatory response in macrophages via suppression of NF-κB, JNK and p38 MAPK pathways. Inflamm. Res. 60, 851–859 (2011). https://doi.org/10.1007/s00011-011-0345-2
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DOI: https://doi.org/10.1007/s00011-011-0345-2