Antiinflammatory activity of methanol extract isolated from stem bark of Magnolia kobus |
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Authors: | Kang Jong Soon Lee Ki Hoon Han Mi Hwa Lee Hyunju Ahn Ji-Mi Han Sang-Bae Han Gyoonhee Lee Kiho Park Song-Kyu Kim Hwan Mook |
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Affiliation: | Bioevaluation Center, Korea Research Institute of Bioscience and Biotechnology, Cheongwon, Chungbuk, Korea. |
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Abstract: | The present study reports the antiinflammatory activity of a methanol extract isolated from the stem bark of Magnolia kobus (MK). MK potently inhibited lipopolysaccharide (LPS)-induced production of nitric oxide and interleukin-1beta (IL-1beta) in RAW 264.7 cells, a murine macrophage-like cell line. The secretion of tumor necrosis factor-alpha (TNF-alpha) was also suppressed in LPS-stimulated RAW 264.7 cells although the magnitude of inhibition was weaker than that of nitric oxide and IL-1beta. The mRNA expressions of inducible nitric oxide synthase (iNOS), IL-1beta and TNF-alpha were also suppressed by MK in LPS-stimulated RAW 264.7 cells. Further study demonstrated that LPS-induced DNA binding of AP-1 and phosphorylation of c-jun N-terminal kinase (JNK) were inhibited by MK treatment in RAW 264.7 cells, whereas phosphorylation of p38 mitogen-activated protein kinase was unaffected. Moreover, topical application of MK suppressed ear swelling in 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced skin inflammation model. Collectively, these results suggest that MK exerts antiinflammatory effects in vitro and in vivo and this might be mediated, at least in part, by blocking AP-1 and JNK activation. |
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Keywords: | Magnolia kobus nitric oxide interleukin‐1β tumor necrosis factor‐α AP‐1 |
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