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Bacteria flip an electric switch to worsen food poisoning

Infection-driven change in macrophage movements disseminates bacteria throughout the body

Date:
April 9, 2019
Source:
PLOS
Summary:
Salmonella bacteria flip an electric switch as they hitch a ride inside immune cells, causing the cells to migrate out of the gut toward other parts of the body, according to a new study.
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Salmonella bacteria flip an electric switch as they hitch a ride inside immune cells, causing the cells to migrate out of the gut toward other parts of the body, according to a new study publishing on April 9 in the open-access journal PLOS Biology by Yaohui Sun and Alex Mogilner of New York University and colleagues. The discovery reveals a new mechanism underlying the toxicity of this common food-borne pathogen.

Salmonella are among the commonest, and deadliest, causes of food poisoning, causing over 400,000 deaths every year. Many of those deaths result when the bacteria escape the gut inside immune cells called macrophages. Macrophages are drawn to bacteria in the gut by a variety of signals, most prominently chemicals released from the site of infection. Once there, they engulf the bacteria as a regular part of their infection-fighting job. However, rather than remaining there, bacteria-laden macrophages often leave the site and enter the bloodstream, disseminating the bacteria and greatly increasing the gravity of the infection.

Tissues such as the gut often generate small electrical fields across their outer surfaces, and these electrical fields have been known to drive migration of cells, including macrophages. In the new study, the authors first showed that the lining of the mouse cecum (the equivalent of the human appendix) maintains a cross-membrane electrical field, and that Salmonella infection altered this field and contributed to the attraction of macrophages. Measurements of the polarity of the local charge indicated that the macrophages were attracted to the anode, or positively charged pole within the field. Once they engulfed bacteria, however, they became attracted to the cathode and reversed their migratory direction, moving away from the gut lining, toward vessels of the circulatory system. This switch was driven by a in the composition of certain charged surface proteins on the macrophages; the mechanism by which bacterial engulfment triggers this change is still under investigation.

"Dissemination, rather than localized infection, is the greatest cause of mortality from Salmonella (and other food-borne bacteria), and so understanding more about this polarity switch is likely to help develop new treatments to reduce deaths from food-borne bacterial infections," said Mogilner.


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Journal Reference:

  1. Yaohui Sun, Brian Reid, Fernando Ferreira, Guillaume Luxardi, Li Ma, Kristen L. Lokken, Kan Zhu, Gege Xu, Yuxin Sun, Volodymyr Ryzhuk, Betty P. Guo, Carlito B. Lebrilla, Emanual Maverakis, Alex Mogilner, Min Zhao. Infection-generated electric field in gut epithelium drives bidirectional migration of macrophages. PLOS Biology, 2019; 17 (4): e3000044 DOI: 10.1371/journal.pbio.3000044

Cite This Page:

PLOS. "Bacteria flip an electric switch to worsen food poisoning." ScienceDaily. ScienceDaily, 9 April 2019. <www.sciencedaily.com/releases/2019/04/190409141803.htm>.
PLOS. (2019, April 9). Bacteria flip an electric switch to worsen food poisoning. ScienceDaily. Retrieved July 15, 2024 from www.sciencedaily.com/releases/2019/04/190409141803.htm
PLOS. "Bacteria flip an electric switch to worsen food poisoning." ScienceDaily. www.sciencedaily.com/releases/2019/04/190409141803.htm (accessed July 15, 2024).

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