Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Isolation and Characterization of Kimchi Lactic Acid Bacteria Showing Anti-Helicobacter pylori Activity

Helicobacter pylori 억제능 김치 유산균의 분리와 특성 규명

  • Lee, Youl (Department of Food and Nutrition, Chosun University) ;
  • Chang, Hae-Choon (Department of Food and Nutrition, Chosun University)
  • 이율 (조선대학교 식품영양학과) ;
  • 장해춘 (조선대학교 식품영양학과)
  • Published : 2008.06.28
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Abstract

One bacterium, which showed strong antagonistic activity against H. pylori KCCM 41756, was isolated from kimchi. The strain NO1 was designated as Lactobacillus plantarum NO1 based on Gram staining, biochemical properties, and 16S rRNA gene sequencing. The culture medium $(2{\sim}4{\mu}g/ml)$ of Lb. plantarum NO1 reduced $(40{\sim}60%)$ the urease activity of H. pylori KCCM 41756. Lb. plantarum NO1 inhibited the binding of H. pylori to human gastric cancer cell line, AGS cells, by more than 33%. Lb. plantarum NO1 exhibited high viability (maintained initial viable cell count of $10^9CFU/ml$) in 0.05 M sodium phosphate buffer (pH 3.0) for 2 h, in artificial gastricjuice for 2 h and in 0.3%, 0.5% oxgall for 24 h. Hemolysis phenomena did not observed when Lb. plantarum NO1 was incubated in the blood agar media. We concluded that Lb. plantarum NO1 can be a good candidate as a probiotic, harboring anti-H. pylori activity.

김치로부터 강력한 H. pylori 생육 저해활성을 보이는 균주를 분리, 동정하여 Lb. plantarum NO1으로 명명하였다. Lb. plantarum NO1은 H. pylori 뿐만 아니라 그람 양성균 및 그람 음성균들에 넓은 범위의 저해활성을 나타내었다. Lb. plantarum NO1의 배양 상징액을 H. pylori배양액에 첨가한 후 H. pylori의 urease 활성을 측정한 결과 Lb. plantarum NO1의 강한 urease 억제활성($40{\sim}60%$ 저하)을 확인할 수 있었다. AGS위암 세포주에 H. pylori를 부착시킨 후 Lb. plantarum NO1의 배양액을 첨가하여 AGS세포에서 H. pylori 탈착능을 측정한 결과 Lb. plantarum NO1은 유산균 배양액 무첨가보다 33% 이상 높은 H. pylori 탈착능을 나타내었으며, 비교구로 사용된 Lb. rhamnosus GG, Lb. sakei SI3에 비해 더 우수한 H. pylori 탈착능을 나타내었다. 분리균주의 장내 생존성 여부 확인을 위하여 내산성, 인공위액에서 2시간동안 처리한 결과 Lb. plantarum NO1이 초기균수$(10^9CFU/ml)$를 유지하면서 높은 저항성을 나타내었다. Oxgall 농도 0.3%와 0.5%의 인공담즙에서 24시간 처리한 후에도 초기균수$(10^9CFU/ml)$를 유지하였다. 뿐만 아니라 인공위액에서 생존한 균주를 연속적으로 인공담즙으로 처리하였을 때에도 높은 생존율$(10^8{\sim}10^9CFU/ml)$를 유지하였다. Lb. plantarum NO1의 용혈성 반응 유무 결과 용혈반응이 일어나지 않았으므로 인체에 안전하다는 것을 간접적으로 확인할 수 있었다. 본 연구에서 김치로부터 분리한 H. pylori억제 유산균 Lb. plantarum NO1은 장내에 생존 가능성도 높으며, 동시에 위에서 효과적으로 H. pylori를 억제 할 수 있을 것으로 기대되어진다.

Keywords

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