Biofilm formation by Candida albicans isolated from intrauterine devices

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• 作者：Priyanka Lal (1)
  Vishnu Agarwal (1)
  Parul Pruthi (2)
  Ben M. J. Pereira (1)
  M. R. Kural (3)
  Vikas Pruthi (1)
  
• 关键词：Biofilm ; Candida albicans ; EPS ; XTT
• 刊名：Indian Journal of Microbiology
• 出版年：2008
• 出版时间：December 2008
• 年：2008
• 卷：48
• 期：4
• 页码：438-444
• 全文大小：1148KB
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• 作者单位：Priyanka Lal (1)
  Vishnu Agarwal (1)
  Parul Pruthi (2)
  Ben M. J. Pereira (1)
  M. R. Kural (3)
  Vikas Pruthi (1)
  
  1. Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
  2. High Altitude Plant Physiology Research Centre, HNB Garhwal University, Post Box - 14, Srinagar, Garhwal, Uttaranchal, India
  3. Institute Hospital, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
  
• ISSN：0973-7715

文摘

Our survey revealed that infected intrauterine devices (IUDs) recovered from patients suffering from reproductive tract infections (RTIs) were tainted with Candida biofilm composed of a single or multiple species. Scanning electron microscopy (SEM) analysis of C. albicans biofilm topography showed that it consists of a dense network of mono- or multilayer of cells embedded within the matrix of extracellular polymeric substances (EPS). Confocal scanning laser microscopy (CSLM) and atomic force microscopy (AFM) images depicted that C. albicans biofilms have a highly heterogeneous architecture composed of cellular and noncellular elements with EPS distributed in the cell-surface periphery or at cell-cell interface. Biochemical analysis showed that EPS produced by C. albicans biofilm contained significantly reduced total carbohydrate (40%), protein (5%) and enhanced amount of hexosamine (4%) in contrast to its planktonic counterparts. The in vitro activity of antifungal agents amphotericin B, nystatin, fluconazole and chlorhexidine against pre-formed C. albicans biofilm, assessed using XTT (2,3-bis[2-methoxy-4-nitro-5-sulfophenyl]-2H-tetrazolium-5-carboxanilide) reduction assay revealed increased resistance of these infectious biofilm (50% reduction in metabolic activity at a concentration of 8, 16, 64, 128 μg/ml respectively) in comparison to its planktonic form.