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Evaluation of the bacterial distribution within the biofilm by denaturing gradient gel electrophoresis in the rat model of urinary catheters

  • Urology - Original Paper
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Abstract

Purpose

Most nosocomial urinary tract infections are related to urinary catheters and their biofilm. For the research in this province, animal models are needed to explain the host–pathogen interactions and have an advantage in controlling external interference. This study investigated the validity of the denaturing gradient gel electrophoresis (DGGE) technique for identification of bacteria in a rat model of urinary catheter biofilm.

Methods

After cutting with aseptic technique, the 24-gauge polyurethane IV catheter was placed in the female rat bladder through the urethra. The catheters were kept in the bladder for 2, 4, or 6 weeks for each group. The genomic DNA was isolated from harvested biofilm of the extracted catheter, and DGGE was performed. The band patterns of DGGE results were analysed, and the sequences were compared using the BLAST from the NCBI.

Results

The results show that Pseudomonas aerusinosa, Escherichia coli, Enterococcus spp., and Corynebacterium sp. were the dominant bacterial species, regardless of the indwelling periods, and other species of bacteria, including Burkholderia and Achromobacter, were identified. The changes in bacterial distribution for the different indwelling periods were non-specific.

Conclusions

This study using rat model of urinary catheter suggests that DGGE is a useful method in the analysis of the bacterial community in biofilms. Molecular techniques, including DGGE, are valuable to identify fastidious bacteria in the urinary catheter biofilm. This study may be used as fundamental data for studies involving human materials hereafter.

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Acknowledgments

The authors wish to acknowledge the financial support of Yuhan Corp. and the St. Vincent’s Hospital Research Institute of Medical Science. This study was made possible through the contributions of the research coordinator, Seung June Noh.

Conflict of interest

The authors have no conflict of interests.

Author information

Authors and Affiliations

  1. Department of Urology, St. Vincent’s Hospital, The Catholic University of Korea, College of Medicine, Suwon, Republic of Korea

    Hyun-Sop Choe & Seung-Ju Lee

  2. Department of Bioengineering, Graduate School of Kyonggi Univerisity, Suwon, Republic of Korea

    Hyun-Jung Kim & Sang-Seob Lee

  3. Department of Urology, Seoul St. Mary’s Hospital, The Catholic University of Korea, College of Medicine, Seoul, Republic of Korea

    Ji-Youl Lee

  4. Department of Urology, St. Mary’s Hospital, The Catholic University of Korea, College of Medicine, 62 Yeouido-dong, Yeongdeungpo-gu, Seoul, 150-713, Republic of Korea

    Yong-Hyun Cho

Authors
  1. Hyun-Sop Choe
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  2. Hyun-Jung Kim
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  3. Seung-Ju Lee
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  4. Ji-Youl Lee
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  5. Sang-Seob Lee
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Correspondence to Yong-Hyun Cho.

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Choe, HS., Kim, HJ., Lee, SJ. et al. Evaluation of the bacterial distribution within the biofilm by denaturing gradient gel electrophoresis in the rat model of urinary catheters. Int Urol Nephrol 45, 743–748 (2013). https://doi.org/10.1007/s11255-013-0430-2

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  • DOI: https://doi.org/10.1007/s11255-013-0430-2

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