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Bacteria, Viruses, Fungi And Parasites All Around Us! Why We Don’t Fall Prey

Saturday, July 21, 2012 13:06

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We are surrounded by bacteria, viruses, fungi and parasites. The fact that we nevertheless do not fall prey to infections is thanks to certain cellular sensor molecules such as toll-like receptors (TLR), which recognize the molecular structure of pathogens and intercede by ensuring an often completely unnoticeable elimination of the invaders.

Sensor molecule toll-like receptors (TLR)

Credit: Universität Duisburg-Essen

Their immune-activating abilities were only detected in 1998, a discovery which was awarded with the Nobel Prize. Now, an international research team led by Prof. Dr. Carsten Kirschning of the Institute of Medical Microbiology at the University hospital Essen and the University of Duisburg-Essen and PD Dr. Hubertus Hochrein is examining the complex recognition of bacteria. Their findings have been published in the research journal Science.

Our innate immune system is clever. Certain structures, which are characteristic of many microorganisms are recognized via TLR which trigger the necessary inflammatory response. However, the situation can become dangerous: since this receptor system is so sensitive, the immune response to serious infections may be over-exaggerated and miss the mark. Blood poisoning and frequently septic shock is the result.

Thus, the experts decided to take a closer look at the host recognition of Staphylococcus and E.coli bacteria, often the main agents of blood poisoning. They established that in the cell, TLR13 recognises the segment of bacterial ribosomal ribonucleic acid to which specific antibiotics such as Erythromycin also bind should the segment not have been altered by mutation or other modifications. The concrete ribonucleic acid is referred as 23S rRNA. Animal and human ribosomes do not bind Erythromycin to their own 28S rRNA because its structure resembles that of the 23S rRNA of resistant bacteria.

The new findings are significant for the treatment of bacterial infections and gaining a greater understanding of antibiotic resistance. In addition, these findings may be of help in the therapy of immunological overreactions and lead to new vaccination strategies.

The study was conducted by an international research team led by Prof. Dr. Carsten Kirschning of the Institute of Medical Microbiology at the University hospital, University of Duisburg-Essen, PD Dr. Hubertus Hochrein of Bavarian Nordic in Martinsried, Prof. Dr. Stefan Bauer of the Institute of Immunology at the Philipps University of Marburg and Prof. Dr. Hermann Wagner of the Institute of Medical Microbiology, Immunology and Hygiene at the Technical University of Munich. Further collaborating scientists came from Munich, Switzerland and Japan.

Contacts and sources:

Universität Duisburg-Essen

Citation: Marina Oldenburg, Anne Krüger, Ruth Ferstl, Andreas Kaufmann, Gernot Nees, Anna Sigmund, Barbara Bathke, Henning Lauterbach, Mark Suter, Stefan Dreher, Uwe Koedel, Shizuo Akira, Taro Kawai, Jan Buer, Hermann Wagner, Stefan Bauer, Hubertus Hochrein, Carsten J. Kirschning, TLR13 Recognizes Bacterial 23S rRNA Devoid of Erythromycin Resistance–Forming Modification, Science DOI: 10.1126/science.1220363. http://www.sciencemag.org/cgi/content/abstract/science.1220363

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