Journal of Applied Biological Chemistry

The Korean Society for Applied Biological Chemistry (한국응용생명화학회)
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Anti-inflammatory effect of a mixture of Astragalus membranaceus and Lithospermum erythrorhizon extracts by inhibition of MAPK and NF-κB signaling pathways in RAW264.7 cells

RAW264.7 대식세포에서 MAPK 및 NF-κB 신호전달 경로 억제를 통한 황기 및 지치 복합물의 항염증 효과

  • Choi, Doo Jin (Department of Herbal Crop Research, National Institute of Horticultural and Herbal Science, RDA) ;
  • Kim, Geum Soog (Department of Herbal Crop Research, National Institute of Horticultural and Herbal Science, RDA) ;
  • Choi, Bo-Ram (Department of Herbal Crop Research, National Institute of Horticultural and Herbal Science, RDA) ;
  • Lee, Young-Seob (Department of Herbal Crop Research, National Institute of Horticultural and Herbal Science, RDA) ;
  • Han, Kyung Sook (Department of Herbal Crop Research, National Institute of Horticultural and Herbal Science, RDA) ;
  • Lee, Dong-Sung (College of Pharmacy, Chosun University) ;
  • Lee, Dae Young (Department of Herbal Crop Research, National Institute of Horticultural and Herbal Science, RDA)
  • Received : 2020.09.28
  • Accepted : 2020.11.13
  • Published : 2020.12.31
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Abstract

This study investigated a mixture of Astragalus membranaceus (AM) and Lithospermum erythrorhizon (LE) extracts (ALM16), exerts anti-inflammatory effects in lipopolysaccharide (LPS)-induced RAW264.7 macrophage cells, and its underlying mechanism. ALM16 was prepared by mixing AM and LE extracts in a ratio of 7:3 (w/w). Cytotoxicity of ALM16 in RAW264.7 cells was not shown up to 200 ㎍/mL of ALM16. The results of this study showed that ALM16 does-dependently inhibits the production of nitric oxide, prostaglandin E2 and pro-inflammatory cytokines (interleukin-1β, interleukin-6, and tumor necrosis factor-α) in LPS-induced RAW264.7 cells. ALM16 not only markedly reduced the protein expression levels of inducible nitric oxide synthase and cyclooxygenase-2 (COX-2) in LPS-stimulated RAW264.7 cells, but also inhibited the nuclear translocation and DNA-binding activity of nuclear factor-kappa B (NF-κB). In addition, ALM16 specifically inhibited the phosphorylation of c-Jun N-terminal kinase and extracellular signal-regulated kinases in LPS-stimulated RAW264.7 cells. In conclusion, these results suggest that ALM16 may exert anti-inflammatory effect by modulating mitogen-activated protein kinase and NF-κB signaling pathways.

본 연구는 황기와 지치 복합물인 ALM16이 lipopolysaccharide 처리에 의해 자극된 RAW264.7 대식세포의 염증반응에 미치는 영향에 대하여 조사하였다. ALM16은 RAW264.7 대식세포에 대하여 최대 200 ㎍/mL의 농도까지 독성은 보이지 않았다. 항염증 활성을 검정하기 위해 nitric oxide (NO), prostaglandin E2 (PGE2) 및 pro-inflammatory cytokines 생성량을 측정한 결과, ALM16은 각각의 생성량을 농도의존적으로 감소시켰다. 또한 ALM16은 NO와 PGE2 생성에 관여하는 inducible nitric oxide synthase (iNOS)와 cyclooxygenase-2 (COX-2)의 단백질 발현을 억제하였다. 한편, 항염증 활성 조절 기전을 확인하기 위하여 NK-κB의 핵으로의 이동과 DNA-binding activity 및 MAPK 신호전달 경로에 대한 ALM16의 영향을 확인한 결과, ALM16은 NF-κB의 핵으로 이동과 DNA-binding activity를 유의적으로 억제하였으며, JNK와 ERK 특이적으로 인산화를 억제함으로써 MAPK 신호전달 경로 활성을 억제하였다. 이러한 결과를 종합하여 볼 때 ALM16이 MAPK와 NF-κB의 신호전달 경로 억제를 통한 iNOS와 COX-2의 발현을 조절하고, 이로 인하여 NO, PGE2 및 pro-inflammatory cytokines의 생성이 감소하여 염증 반응을 조절하는 능력이 있는 것으로 판단된다.

Keywords

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