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An amoeba phagocytosis model reveals a novel developmental switch in the insect pathogen Bacillus thuringiensis
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Beeton, M. L., Atkinson, D. J. and Waterfield, Nicholas R. (2013) An amoeba phagocytosis model reveals a novel developmental switch in the insect pathogen Bacillus thuringiensis. Journal of Insect Physiology, Volume 59 (Number 2). pp. 223-231. doi:10.1016/j.jinsphys.2012.06.011 ISSN 0022-1910.
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Official URL: http://dx.doi.org/10.1016/j.jinsphys.2012.06.011
Abstract
The Bacillus cereus group bacteria contain pathogens of economic and medical importance. From security and health perspectives, the lethal mammalian pathogen Bacillus anthracis remains a serious threat. In addition the potent insect pathogen Bacillus thuringiensis is extensively used as a biological control agent for insect pests. This relies upon the industrial scale induction of bacterial spore formation with the associated production of orally toxic Cry-toxins. Understanding the ecology and potential alternative developmental fates of these bacteria is therefore important. Here we describe the use of an amoeba host model to investigate the influence of environmental bactivorous protists on both spores and vegetative cells of these pathogens. We demonstrate that the bacteria can respond to different densities of amoeba by adopting different behaviours and developmental fates. We show that spores will germinate in response to factors excreted by the amoeba, and that the bacteria can grow and reproduce on these factors. We show that in low densities of amoeba, that the bacteria will seek to colonise the surface of the amoeba as micro-colonies, resisting phagocytosis. At high amoeba densities, the bacteria change morphology into long filaments and macroscopic rope-like structures which cannot be ingested due to size exclusion. We suggest these developmental fates are likely to be important both in the ecology of these bacteria and also during animal host colonisation and immune evasion.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School > Biomedical Sciences > Microbiology & Infection Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School |
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Journal or Publication Title: | Journal of Insect Physiology | ||||
Publisher: | Pergamon | ||||
ISSN: | 0022-1910 | ||||
Official Date: | 2013 | ||||
Dates: |
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Volume: | Volume 59 | ||||
Number: | Number 2 | ||||
Page Range: | pp. 223-231 | ||||
DOI: | 10.1016/j.jinsphys.2012.06.011 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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