오수유 메탄올 추출물이 Helicobacter pylori 병원성 관련유전자 발현에 미치는 영향
Effect of Evodiae fructus Methanol Extract on Virulence-Related Genes’ Expression of Helicobacter pylori
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초록
위에 군집을 형성하는 그람 음성 박테리아인 Helicobacter pylori는 위암을 일으킬 수 있는 1급 발암 인자로, H. pylori의성장을 억제하거나 제거하는 물질을 탐색하는 연구가 꾸준히진행되어 왔다. 오수유는 운향과에 속하는 오수유의 열매를 일컫는 생약으로 한방에서는 설사 및 복통에 사용되던 약재이다. 오수유 추출물이 H. pylori 의 성장을 억제한다는 보고는 있었으나 병원성 요인에 어떤 영향을 주는지에 대한 연구는 보고된바가 없었다. 본 연구에서는 각기 다른 메탄올 농도에서 추출한오수유 추출물의 H. pylori 성장 억제 효과를 비교하였으며 또한 오수유 추출물이 H. pylori의 병원성 인자에 미치는 영향을연구하였다. 95% 메탄올 오수유 추출물이 가장 낮은 최소저해농도(MIC) 값을 보였으며, 이 95% 추출물을 대상으로 하여MIC 미만 농도에서 H. pylori의 병원성 인자의 발현 변화를 확인하였다. 95% 메탄올 오수유 추출물은 H. pylori의 주요 병원성 인자인 cagA, vacA 그리고 ureB의 mRNA 및 단백질의 발현을 억제하였으나 흥미롭게도 ureA의 발현은 증가시켰다. 하지만 H. pylori의 배양액과 세포내의 암모니아의 량이 현저히 낮아졌음을 확인하였고, 이는 오수유 추출물이 ureB의 mRNA 및단백질의 발현을 억제하여 H. pylori의 urease 활성을 억제한다는 것을 확인하였다. 오수유 추출물의 병원성 인자 조절 기전에 대해서는 좀 더 연구가 필요할 것으로 보이나, 본 연구 결과는오수유 추출물이 H. pylori로 인한 부정적 영향을 줄여줄 것으로 생각한다.
Abstract
Helicobacter pylori, a gram-negative bacterium, is one of the risk factors that induces gastritis and gastric cancer. Therefore, much attention has been paid to the compounds that inhibit bacterial growth or eradicate bacteria. Evodiae fructus (EF), the fruit of Evodia rutaecarpa, has been used for treating diarrhea and abdominal pain. EF extract was already found to inhibit the growth of H. pylori. However, to the best of our knowledge, the effect of EF on the virulence factors of H. pylori has not been reported. In this study, when comparing the minimum inhibitory concentration (MIC) of the different methanol concentration extracts, the 95% methanol extract (EF95) showed the lowest MIC value. EF95 extract suppressed the expressions of cagA, vacA and ureB, but interestingly, it up-regulated the expression of ureA. A decrease in production of ammonia in the culture medium and the cell lysates indicated that EF95 inhibited the urease activity in H. pylori, which was the result of EF95 inhibiting the ureB expression. Although the mechanism by which EF95 extract regulates the virulence factors in H. pylori needs further study, EF95 could be used for treatment of gastric troubles induced by H. pylori.
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