Abstract
Biofilms play a pivotal role in infections related to devices. Biofilm formation in Escherichia coli is mediated by the quorum-sensing E. coli regulator C (QseC), the histidine sensor kinase that can sense epinephrine (EPI)/norepinephrine (NE). In this study, we evaluate the role of the QseC quorum-sensing sensor kinase in epinephrine-enhanced motility and biofilm formation by E. coli. An E. coli MC1000 qseC mutant was constructed. We investigated the role of the QseC in the formation of biofilms on the surface of medical-grade polyvinyl chloride using the E. coli K-12 MC1000 strain as well as a corresponding qseC mutant. Addition of EPI/NE increased biofilm formation by wild-type K-12 MC1000 but not by the isogenic qseC mutant. Scanning confocal laser microscopy corroborated these results by showing that EPI/NE addition significantly increased biofilm’s thickness. As expected, the addition of EPI/NE to the qseC mutant, which lacks the ability to sense the hormones, failed to stimulate biofilm formation. Since EPI/NE addition increased bacterial motility, we proposed that their stimulatory effects on biofilm formation occur by enhancing bacterial motility and altering biofilm architecture. We also found that EPI/NE regulate motility and the biofilm phenotype via QseC, as motility was diminished and biofilm formation was significantly decreased in a qseC deletion mutant. These results indicate that EPI/NE induce E. coli biofilm formation on the surface of polyvinyl chloride through QseC. Cross-talk between E. coli (quorum sensing) and host hormones may explain the pathogen-caused opportunistic infections that occur in patients with prosthetic devices used during hormone level fluctuations in the host.
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Acknowledgments
The authors thank the E. coli Genetic Stock Centre (Yale University) for sending plasmids pKD3, pKD46, pCP20, and E. coli strain MC1000. The authors thank Dr. Zhang HT from the Immunology and Biology Laboratory, Institute of Zoology, Chinese Academy of Science for E. coli isolates and for technical advice. This work was supported by Grants 30872555 and 81260228 from the National Natural Science Foundation of China.
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Kun Yang and Jun Meng have contributed equally to this work.
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Yang, K., Meng, J., Huang, Yc. et al. The Role of the QseC Quorum-Sensing Sensor Kinase in Epinephrine-Enhanced Motility and Biofilm Formation by Escherichia coli . Cell Biochem Biophys 70, 391–398 (2014). https://doi.org/10.1007/s12013-014-9924-5
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DOI: https://doi.org/10.1007/s12013-014-9924-5