Biofilm formation by Salmonella enterica serovar Typhimurium colonizing solid tumours
Version of Record online: 25 MAY 2011
© 2011 Blackwell Publishing Ltd
Volume 13, Issue 8, pages 1223–1233, August 2011
How to Cite
Crull, K., Rohde, M., Westphal, K., Loessner, H., Wolf, K., Felipe-López, A., Hensel, M. and Weiss, S. (2011), Biofilm formation by Salmonella enterica serovar Typhimurium colonizing solid tumours. Cellular Microbiology, 13: 1223–1233. doi: 10.1111/j.1462-5822.2011.01612.x
- Issue online: 18 JUL 2011
- Version of Record online: 25 MAY 2011
- Accepted manuscript online: 20 APR 2011 08:08AM EST
- Received 19 January, 2011; revised 12 April, 2011; accepted 13 April, 2011.
Systemic administration of Salmonella enterica serovar Typhimurium to tumour bearing mice results in preferential colonization of the tumours and retardation of tumour growth. Although the bacteria are able to invade the tumour cells in vitro, in tumours they were never detected intracellularly. Ultrastructural analysis of Salmonella-colonized tumours revealed that the bacteria had formed biofilms. Interestingly, depletion of neutrophilic granulocytes drastically reduced biofilm formation. Obviously, bacteria form biofilms in response to the immune reactions of the host. Importantly, we tested Salmonella mutants that were no longer able to form biofilms by deleting central regulators of biofilm formation. Such bacteria could be observed intracellularly in immune cells of the host or in tumour cells. Thus, tumour colonizing S. typhimurium might form biofilms as protection against phagocytosis. Since other bacteria are behaving similarly, solid murine tumours might represent a unique model to study biofilm formation in vivo.