Aqueous extract of Dipsacus asperoides suppresses lipopolysaccharide-stimulated inflammatory responses by inhibiting the ERK1/2 signaling pathway in RAW 264.7 macrophages
Autor: | Sun-Dong Park, Young Jun Koh, Dong-Il Kim, Ju-Hee Lee, Ju-Yeon Park |
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Rok vydání: | 2018 |
Předmět: |
Lipopolysaccharides
Lipopolysaccharide MAP Kinase Signaling System p38 mitogen-activated protein kinases medicine.medical_treatment Anti-Inflammatory Agents Nitric Oxide Synthase Type II Inflammation Pharmacology Plant Roots Nitric oxide 03 medical and health sciences chemistry.chemical_compound Mice 0302 clinical medicine Drug Discovery medicine Animals MTT assay 030304 developmental biology 0303 health sciences biology Plant Extracts Macrophages NF-kappa B Membrane Proteins NF-κB Dipsacaceae Nitric oxide synthase Cytokine RAW 264.7 Cells chemistry 030220 oncology & carcinogenesis biology.protein medicine.symptom Heme Oxygenase-1 |
Zdroj: | Journal of ethnopharmacology. 231 |
ISSN: | 1872-7573 |
Popis: | Ethnopharmacological relevance Dipsaci Radix, which is the dried root of Dipsacus asperoides C. Y. Cheng and T. M. Ai (Dipsacaceae), is used to treat back pain and blood stasis syndrome in Korean traditional medicine. Aim of the study To understand the mechanisms responsible for the pharmacological activities of D. asperoides, we investigated the inhibitory effect of D. asperoides on lipopolysaccharide (LPS)-induced inflammation in mouse macrophages RAW 264.7 cells. Materials and methods Aqueous extract of D. asperoides (AEDA) was prepared by boiling D. asperoides in water and then administered to LPS treated RAW 264.7 cells. Cell viabilities were measured using an MTT assay, and protein levels were determined by western blotting. The ROS scavenging activity of AEDA was measured using a DCFH-DA assay and levels of nitric oxide (NO) were determined using a NO assay. The nuclear translocations of NF-κB and Nrf2 were investigated immunocytochemically, and pro-inflammatory cytokines in supernatant were evaluated by ELISA. Results Treatment with AEDA suppressed the expressions of inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) in LPS-stimulated RAW 264.7 macrophages. AEDA also reduced ROS, pro-inflammatory cytokine (IL-6 and IL-1β) levels, and iNOS-derived NO and COX-2-derived prostaglandin E2 release to medium, and suppressed the phosphorylation and degradation of IκB and the activation of NF-κB in macrophages. Furthermore, treatment with AEDA inhibited the ERK1/2 pathway but not the JNK or p38 MAPK pathways. In addition, AEDA significantly promoted Nrf2 translocation from cytoplasm to nucleus and up-regulated the expression of HO-1. Conclusion These results suggest that AEDA has anti-inflammatory and anti-oxidative effects through the inhibition of NF-κB and ERK1/2 and the activation of Nrf2/HO-1 in macrophages. |
Databáze: | OpenAIRE |
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