LPS로 유도된 RAW 264.7 cell로부터 NF-κB 조절 억제와 마우스 모델을 통한 큰잎모자반 에탄올 추출물의 항염증 효과
Anti-inflammatory Effect of Sargassum coreanum Ethanolic Extract through Suppression of NF-κB Pathway in LPS Induced RAW264.7 Cells in Mice
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초록
본 연구에서는 큰잎모자반의 항염증 효과를 알아보기 위해 LPS에 의해 염증반응이 유도된 RAW 264.7 세포에 대한 큰잎모자반 에탄올 추출물의 항염증 효과를 살펴보았다. 세포내 염증매개성 cytokine (IL-6, TNF-α 및 IL-1β) 분비량의 측정결과, 농도 의존적으로 유의적 감소를 보였으며, 특히, 100 μg/ml로 처리하였을 경우 LPS 단독 처리와 비교 시 약 48% 이상의 높은 분비량 감소효과를 보였다. 추출물이 iNOS, COX-2 및 NF-kB 발현 억제에 미치는 효과를 알아본 결과, LPS 단독처리구에 의해 각 단백질의 발현량이 현저히 증가하였으나, 추출물을 처리하였을 때 그 발현량이 농도 의존적으로 감소하는 것을 확인할 수가 있었다. 특히 50 및 100 μg/ ml 농도에서 PBS 처리구와 유사한 발현량을 보여 우수한 항염증 효과를 가짐을 확인하였다. 귀 부종 억제 효과 및 조직관찰을 수행한 결과, 추출물 250 mg/kg 농도에서 prednisolone 10 mg/kg 처리와 유사하게 감소함을 보였다. 또한, croton oil 로 부종을 유발한 마우스 귀 조직에서 croton oil만을 처리한 경우에 비해 추출물을 100 mg/ml 농도로 처리한 경우prednisolone 처리구와 유사한 정도로 경피 및 진피 두께가 얇아진 것을 확인하였으며, 조직 내 mast cell 침윤을 현저히 억제함을 보였다. 이 결과를 종합해 볼 때, 큰잎모자반 에탄올 추출물이 염증 치료제로써의 소재로 이용될 가치가 충분할 것으로 사료된다.
Abstract
The anti-inflammatory effect of Sargassum coreanum ethanolic extract (SCEE) was investigated using lipopolysaccharide (LPS)-induced inflammatory responses in this study. It was shown that there was no cytotoxicity in the viability of macrophages treated with SCEE when compared to the control. The production of NO was considerably suppressed by SCEE, approximately up to 50% at 100 μg/ml. This significantly decreased levels of IL-6, TNF-α, and IL-1β. In addition, the expression of iNOS, COX-2, NF-κB was suppressed by SCEE treatment. In in vivo testing, the croton oil-induced mouse ear edema was attenuated by SCEE and there were no mortalities in mice administered with 5000 mg/kg body weight of SCEE over a 2 week observation period. From these results, SCEE inhibits the release of LPS-induced pro-inflammatory cytokines and mediators, suggesting that SCEE could be a potential agent for anti-inflammatory therapies.
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