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How staphylococci trigger blood poisoning

Researchers identify lipopeptides as the culprit

Date:
August 4, 2016
Source:
University of Tübingen
Summary:
Septicemia or blood poisoning caused by Staphylococcus aureus leads to thousands of deaths each year in Germany alone. Just how the infection begins -- and can lead to multiple organ failure -- was little understood until now. Researchers have now uncovered a major cause of this life-threatening condition.
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Septicemia or blood poisoning caused by Staphylococcus aureus leads to thousands of deaths each year in Germany alone. Just how the infection begins -- and can lead to multiple organ failure -- was little understood until now. There are few options for diagnosing and treating the disease. Researchers at the University of Tübingen's Interfaculty Institute for Microbiology and Infection Medicine (IMIT) and the German Center for Infection Medicine (DZIF) headed by Dr. Dorothee Kretschmer, Dennis Hanzelmann and Professor Andreas Peschel have now uncovered a major cause of this life-threatening condition.

The results of their study have been published in the latest issue of Nature Communications.

Many other pathogens -- Gram-negative bacteria -- form endotoxin molecules, which can lead to septicemia. But because staphylococci do not contain endotoxins, it was unclear just how they caused septicemia. The researchers have now shown that lipopeptides play a key role in triggering the disease and that certain staphylococcus bacteria form additional molecules -- known as PSM peptides -- which release these lipopeptides. Infections caused by PSM-negative staphylococci are also common, but these staphylococci do not release lipopeptides and hardly set off septicemia in experimental infections.

Knowing that only certain staphylococci release PSM peptides may help doctors to better assess how dangerous a patient's Staphylococcus strain may be. It will also enable them to develop new treatments to prevent the formation of PSM and lipopeptides, thereby avoiding severe cases of blood poisoning.


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Materials provided by University of Tübingen. Note: Content may be edited for style and length.


Journal Reference:

  1. Dennis Hanzelmann, Hwang-Soo Joo, Mirita Franz-Wachtel, Tobias Hertlein, Stefan Stevanovic, Boris Macek, Christiane Wolz, Friedrich Götz, Michael Otto, Dorothee Kretschmer, Andreas Peschel. Toll-like receptor 2 activation depends on lipopeptide shedding by bacterial surfactants. Nature Communications, 2016; 7: 12304 DOI: 10.1038/ncomms12304

Cite This Page:

University of Tübingen. "How staphylococci trigger blood poisoning: Researchers identify lipopeptides as the culprit." ScienceDaily. ScienceDaily, 4 August 2016. <www.sciencedaily.com/releases/2016/08/160804071437.htm>.
University of Tübingen. (2016, August 4). How staphylococci trigger blood poisoning: Researchers identify lipopeptides as the culprit. ScienceDaily. Retrieved May 28, 2017 from www.sciencedaily.com/releases/2016/08/160804071437.htm
University of Tübingen. "How staphylococci trigger blood poisoning: Researchers identify lipopeptides as the culprit." ScienceDaily. www.sciencedaily.com/releases/2016/08/160804071437.htm (accessed May 28, 2017).

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