Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Inhibition of Candida albicans Biofilm Formation by Coptidis chinensis through Damaging the Integrity of Cell Membrane

세포막손상 유발로 인한 황련의 캔디다 바이오필름 형성 억제

  • Kim, Younhee (Department of Oriental Medicine, Semyung University)
  • Received : 2013.01.21
  • Accepted : 2013.02.06
  • Published : 2013.03.31
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Abstract

Candida biofilms are organized microbial communities growing on the surfaces of host tissues or indwelling medical devices, and the biofilms show enhanced resistance against the conventional antifungal agents. The roots of Coptidis chinensis have been widely used for medicinal purposes in East Asia. The present study was aimed to assess the effect of C. chinensis aqueous extract upon preformed biofilms of 10 clinical Candida albicans isolates and the antifungal activities which contribute to inhibit the C. albicans biofilm formation. Its effect on preformed biofilms was judged using XTT [2,3-Bis-(2-Methoxy-4-Nitro-5-Sulfophenyl)-2H-Tetrazolium-5-Carboxanilide)] reduction assay, and metabolic activity of all tested strains was reduced significantly ($57.3{\pm}14.7%$) at $98{\mu}g/ml$ of the C. chinensis extract. The extract damaged the cell membrane of C. albicans which was analyzed by fluorescein diacetate and propidium iodide staining. The anticandidal activity was fungicidal, and the extract obstructed the adhesion of C. albicans biofilms to polystyrene surfaces, arrested C. albicans cells at $G_o/G_1$ as well, and reduced the growth of biofilms or budding yeasts finally. The data suggest that C. chinensis has multiple antifungal effects on target fungi resulting in preventing the formation of biofilms. Therefore, C. chinensis holds great promise for exploring antifungal agents from natural products in treating and eliminating biofilm-associated Candida infection.

Candida 바이오필름은 숙주조직이나 인체에 삽입된 의료기구의 표면에 자라는 진균의 군락으로 전통적인 항진균제에 대한 내성을 유발한다. 황련(Coptidis chinensis)의 뿌리는 극동지방에서 의료용 목적으로 널리 사용되어 왔다. 본 연구의 목적은 임상에서 분리한 C. albicans 바이오필름 형성 균주가 형성한 바이오필름에 대한 C. chinensis 수용성 추출물의 효과와 C. albicans 바이오필름 형성을 저해하는 데 기여하는 항진균활성을 평가하는 데 있다. 바이오필름에 대한 효과는 XTT [2,3-Bis-(2-Methoxy-4-Nitro-5-Sulfophenyl)-2H-Tetrazolium-5-Carboxanilide)] 환원분석법을 사용하였으며, 조사된 모든 균주에 대한 대사활성은 $98{\mu}g/ml$의 C. chinensis 수용성 추출물에 의해 현저하게 감소($57.3{\pm}14.7%$)되어 유의성 있는 항바이오필름 활성을 나타내었다. Fluorescein diacetate와 propidium iodide로 이중 염색한 결과 C. chinensis 추출물은 C. albicans의 세포막을 손상시켰다. C. chinensis 수용성 추출물은 살진균 활성을 나타냈고, C. albicans 바이오필름의 폴리스티렌 표면으로의 부착을 억제하였으며 C. albicans를 $G_o/G_1$기에 머무르게 하여 바이오필름이나 출아법에 의한 증식을 억제시켰다. 본 연구의 결과는 C. chinensis 추출물이 목표가 되는 C. albicans에 복합적으로 유해한 효과를 내어 궁극적으로는 C. albicans 바이오필름 형성을 억제함을 나타낸다. 따라서 C. chinensis 추출물은 바이오필름과 관련된 캔디다의 감염을 치료하고 제거하기 위한 천연물 기반항진균제 개발에 대한 높은 가능성을 가진다.

Keywords

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