Journal of Nutrition and Health

The Korean Nutrition Society (한국영양학회)
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Immunomodulatory effect of the water extract of Aster tataricus through mitogen-activated protein kinase signaling pathway

Aster tataricus 물 추출물의 mitogen-activated protein kinase 신호 전달 경로를 통한 면역 조절 효과

  • Lee, Chea Yeon (Division of Research Program, Scripps Korea Antibody Institute) ;
  • Park, Hyo Sung (Division of Research Program, Scripps Korea Antibody Institute) ;
  • Kong, Deok-Hoon (Division of Research Program, Scripps Korea Antibody Institute) ;
  • Kim, Young Kwan (Division of Research Program, Scripps Korea Antibody Institute) ;
  • Cho, Whajung (Division of Research Program, Scripps Korea Antibody Institute)
  • 이채연 (스크립스코리아항체연구원 연구본부) ;
  • 박효성 (스크립스코리아항체연구원 연구본부) ;
  • 공덕훈 (스크립스코리아항체연구원 연구본부) ;
  • 김영관 (스크립스코리아항체연구원 연구본부) ;
  • 조화정 (스크립스코리아항체연구원 연구본부)
  • Received : 2020.06.23
  • Accepted : 2020.07.29
  • Published : 2020.10.31
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Abstract

Purpose: Aster tataricus (AT) is one of the Asteraceae perennial herbs used in traditional Chinese medicine. The herb contains various bioactive substances, such as flavonoids, isoflavonoids, and phenolic compounds in the roots, and exhibits a range of effects including anti-bacterial, anti-oxidant, and anti-inflammatory activities. This study compared the immunomodulatory effects of ethanol and water extracts of whole AT, except the roots, and analyzed the molecular mechanisms for the regulatory effects on cytokine secretion from THP-1 cells. Methods: The effects of AT extract on the cell viability and proliferation of THP-1 cells were analyzed using the Cell Counting Kit-8 method. The concentrations of interleukin-1β (IL-1β) and tumor necrosis factor-α (TNF-α) in the cell culture supernatant of the AT-treated THP-1 cells were measured using an enzyme-linked immunosorbent assay. The protein levels of cyclooxygenase-2 (COX-2), inducible nitric oxide synthase (iNOS), inhibitor of nuclear factor kappa B (IκBα), and mitogen-activated protein kinase (MAPK) phosphorylation in the cell lysates were determined by western blotting. Results: The water extract and the ethanol extract of AT did not affect the cell viability, and increased the proliferation of THP-1 cells significantly compared to the vehicle. The water extract increased the secretion of IL-1β from THP-1 cells in a dose-dependent manner, but the ethanol extract had no effect. The expression of COX-2 and iNOS protein and the phosphorylation of MAPK and Akt were induced in AT-treated cells. In addition, IκBα was degraded by AT in a concentration-dependent manner. IL-1β secretion by AT was reduced by extracellular-signal-regulated kinase (ERK) and c-Jun N-terminal kinase (JNK) inhibitors, while TNF-α secretion was decreased by inhibitors of ERK, p38 MAPK, and JNK. Interestingly, the p38 MAPK inhibitor increased the production of IL-1β by AT further. Conclusion: The water extract of the above-ground parts of AT contains immunomodulatory bioactive substances that stimulate immune cells through the MAPK signaling pathway.

본 연구는 AT의 뿌리를 제외한 전체 AT의 에탄올 및 물 추출물의 면역 조절 효과를 비교하고 THP-1의 cytokine 분비를 조절하는 분자 메커니즘을 조사하였다. AT의 물 추출물 및 에탄올 추출물은 THP-1 세포에 독성이 없으며 세포 증식을 증가키는 것을 확인하였다. 에탄올 추출물은 영향이 없는데 반해, 물 추출물은 THP-1의 IL-1β의 분비를 증가시켰으며 COX-2 및 iNOS 단백질의 발현을 증가시켰다. 또한, MAPK 및 Akt의 인산화와 IkBα의 분해를 유도하는 것을 확인하였다. AT에 의한 IL-1β 분비는 ERK 및 JNK 억제제에 의해 감소되었으며, TNF-α의 분비는 ERK, p38 MAPK 및 JNK 억제제에 의해 감소되었다. 흥미롭게도, p38 MAPK 억제제는 AT에 의한 IL-1β의 생성을 추가로 증가시켰다. 이 결과는 AT 지상부의 물 추출물에 MAPK 신호 전달 경로를 통해 면역 세포를 자극하여 cytokine의 생산을 유도하는 생리활성물질이 존재한다는 것을 의미한다. 따라서, AT 지상부는 면역력 강화제의 천연 소재로써 이용될 수 있을 것으로 사료된다.

Keywords

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