Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Antifungal Activity of Rheum undulatum on Candida albicans by the Changes in Membrane Permeability

막투과성 변화로 인한 대황의 Candida albicans에 대한 항진균 활성

  • Lee, Heung-Shick (Department of Biotechnology and Bioinformatics, Korea University) ;
  • Kim, Younhee (Department of Korean Medicine, Semyung University)
  • Received : 2014.12.16
  • Accepted : 2014.12.24
  • Published : 2014.12.31
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Abstract

Candida albicans is an opportunistic and the most prevalent fungal pathogen that can cause superficial and systemic infections in immunocompromised patients. C. albicans can promote the transition from budding yeast to filamentous form, generating biofilms. Infections associated with C. albicans biofilms are frequently resistant to conventional antifungal therapy. Therefore, the development of more effective antifungal drugs related with biofilm formation is required urgently. The roots of Rheum undulatum have been used for medicinal purposes in Korea and China traditionally. The aim of present study was to evaluate the effect of R. undulatum extract upon preformed biofilms of 12 clinical C. albicans isolates and the antifungal activities. Its effect on preformed biofilms was evaluated using XTT reduction assay, and metabolic activity of all tested strains was reduced significantly ($49.4{\pm}6.0%$) at 0.098 mg/ml R. undulatum. The R. undulatum extract blocked the adhesion of C. albicans biofilms to polystyrene surfaces, and damaged the cell membrane integrity of C. albicans which was analyzed by CFDA, AM, and propidium iodide double staining. It caused cell lysis which was observed by Confocal laser scanning and phase contrast microscope after propidium iodide and neutral red staining, respectively. Membrane permeability was changed as evidenced by crystal violet uptake. The data suggest that R. undulatum inhibits biofilm formation by C. albicans, which can be associated with the damage of the cell membrane integrity, the changes in the membrane permeability and the cell lysis of C. albicans.

Candida albicans는 면역력이 약화된 환자의 표재성에서 전신적 감염까지 다양한 부위에서 감염을 유발시킬 수 있는 기회 감염적 병원성 진균이다. C. albicans는 효모형에서 균사형으로 변환될 수 있으며 이 때 바이오필름을 형성할 수 있다. 바이오필름과 관련된 C. albicans의 감염은 일반적으로 통상적인 항진균제에 대해 내성을 보이므로 새로운 항진균제에 대한 개발이 절실하다. 대황(Rheum undulatum)은 전통적으로 한국과 중국에서 하제나 소염제로 사용되는 약용 식물이다. 본 연구의 목적은 R. undulatum이 캔디다증 환자로부터 분리한 C. albicans 바이오필름 형성 균주에 대한 바이오필름 형성 억제효과와 이에 대한 항진균 활성 기작을 알아보는 것이다. R. undulatum (0.098 mg/ml)은 12종의 바이오필름 형성 임상균주의 캔디다 바이오필름을 $49.4{\pm}6.0%$ 감소시켰고 C. albicans의 폴리스티렌 표면으로의 부착을 억제시켰다. CFDA, AM과 propidium iodide로 이중 염색한 결과 R. undulatum은 C. albicans의 세포막을 손상시켰으며 propidium iodide와 neutral red로 염색하여 공초점 레이저 현미경과 위상차 현미경으로 관찰한 결과 C. albicans의 세포용해를 야기함을 관찰할 수 있었다. Crystal violet 흡수율 실험으로 R. undulatum에 의한 세포막 투과성의 변화를 관찰하였다. 따라서 R. undulatum은 세포막의 손상과 세포막의 투과성 변화로 야기된 세포의 용해와 관련된 항진균 활성이 C. albicans의 바이오필름 형성을 억제하는 것으로 보여진다. 본 연구의 결과는 R. undulatum이 바이오필름과 관련된 캔디다의 감염을 치료하고 제거하기 위한 천연물 기반 항진균제 개발에 대한 좋은 후보물질임을 보여준다.

Keywords

References

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