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Invisible helpers: How probiotic bacteria protect against inflammatory bowel diseases

Date:
April 26, 2012
Source:
Technische Universitaet Muenchen
Summary:
Some lactic acid bacteria can alleviate inflammation and therefore prevent intestinal disorders. Scientists have now decoded the biochemical mechanism that lies behind the protective effect of the bacteria. In experiments with mice, the researchers succeeded in demonstrating that lactocepin – an enzyme produced by certain lactic acid bacteria – selectively degrades inflammatory mediators in diseased tissue. This new evidence might lead to new approaches for the treatment of inflammatory bowel diseases.

A glimpse through the laser microscope – green indicates the presence of inflammatory messenger substances (chemokines) in the bowel tissue.
Credit: TUM

Some lactic acid bacteria can alleviate inflammation and therefore prevent intestinal disorders. Scientists have now decoded the biochemical mechanism that lies behind the protective effect of the bacteria. In experiments with mice, the researchers succeeded in demonstrating that lactocepin -- an enzyme produced by certain lactic acid bacteria -- selectively degrades inflammatory mediators in diseased tissue. This new evidence might lead to new approaches for the treatment of inflammatory bowel diseases.

Yoghurt has been valued for centuries for its health-promoting effects. These effects are thought to be mediated by the lactic acid bacteria typically contained in yoghurt. Evidence from recent scientific studies show that some bacterial strains actually have a probiotic effect and can thus prevent disease. A team of biologists and nutrition scientists working with Prof. Dirk Haller from the Technische Universitaet Muenchen (TUM) has now discovered the mechanisms at work behind this protective effect.

In experiments with mice, the scientists observed that lactocepin -- an enzyme produced from the lactic acid bacterium Lactobacillus paracasei -- can selectively interrupt inflammatory processes. As the scientists observed, lactocepin degrades messengers from the immune system, known as chemokines, in the diseased tissue. As a part of the "normal" immune response, chemokines are needed to guide defense cells to the source of the infection. In chronic intestinal disorders like Crohn's disease and ulcerative colitis, the otherwise highly effective defense mechanism against infectious agents is malfunctioning. Chemokines such as "IP-10" then contribute to the tissue damage due to chronic inflammatory processes, preventing the tissue from healing.

"Lactocepin is a familiar element in food technology research," says Prof. Dirk Haller, who holds the Chair for Biofunctionality of Food at the TUM. "What is surprising, however, is its biomedical effect, namely the force with which the enzyme attacks and degrades very specific inflammatory mediators." Haller is certain that, based on this mechanism, it will be possible to develop new approaches to the targeted prevention and treatment of chronic bowel diseases as well as skin disorders: "The anti-inflammatory effect of lactocepin is limited to specific areas and up to now it has no known side effects."

The scientist therefore plans to carry out clinical studies in order to test the possible pharmaceutical application of the enzyme. Questions also remain to be answered in relation to the "production" of lactocepin by lactic acid bacteria. Some bacterial strains, such as Lactobacillus paracasei, produce highly potent lactocepins; however, the effectiveness of other microorganisms has not yet been proven. Dirk Haller therefore warns against false promises: "Not every product labeled as 'probiotic' actually earns this name."


Story Source:

The above story is based on materials provided by Technische Universitaet Muenchen. Note: Materials may be edited for content and length.


Journal Reference:

  1. Marie-Anne von Schillde, Gabriele Hörmannsperger, Monika Weiher, Carl-Alfred Alpert, Hannes Hahne, Christine Bäuerl, Karolien van Huynegem, Lothar Steidler, Tomas Hrncir, Gaspar Pérez-Martínez, Bernhard Kuster, Dirk Haller. Lactocepin Secreted By Lactobacillus Exerts Anti-Inflammatory Effects By Selectively Degrading Proinflammatory Chemokines. Cell Host & Microbe, 2012; 11 (4): 387 DOI: 10.1016/j.chom.2012.02.006

Cite This Page:

Technische Universitaet Muenchen. "Invisible helpers: How probiotic bacteria protect against inflammatory bowel diseases." ScienceDaily. ScienceDaily, 26 April 2012. <www.sciencedaily.com/releases/2012/04/120426105654.htm>.
Technische Universitaet Muenchen. (2012, April 26). Invisible helpers: How probiotic bacteria protect against inflammatory bowel diseases. ScienceDaily. Retrieved July 31, 2014 from www.sciencedaily.com/releases/2012/04/120426105654.htm
Technische Universitaet Muenchen. "Invisible helpers: How probiotic bacteria protect against inflammatory bowel diseases." ScienceDaily. www.sciencedaily.com/releases/2012/04/120426105654.htm (accessed July 31, 2014).

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