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The Right Messenger For A Healthy Immune Response

Date:
August 11, 2009
Source:
Helmholtz Association of German Research Centres
Summary:
Cells of the immune system communicate using molecular messengers. One group of these substances are interferons. During a virus infection, the immune system increases the production of interferons such as Beta-Interferon, thus alerting immune cells to combat the infection. Furthermore, Beta-interferon also has tumor-fighting qualities and -- used as a therapeutic against multiple sclerosis -- is of major importance for medicine.

Researchers from the Molecular Immunology group at the Helmholtz Centre for Infection Research (HZI) in Braunschweig, Germany have now shown that Beta-Interferon also plays a crucial role during an immune response: without Beta-Interferon immune cells are unable to show "wanted posters" of pathogens to other cells. As a consequence, these cells will not recognize the pathogen and the immune response does not start properly.

During an infection, immune cells produce Beta-Inferferon. Interestingly, an immune response is even stronger when a low amount of Beta-Interferon has already been present before the infection occurs. Scientists call this behaviour "priming". A healthy basal level of Beta-Interferon facilitates a faster immune reaction against microbial and viral threads.

Researchers from the HZI have now managed to show why this is the case: Beta-Interferon is a key regulator and of vital importance in enabling the immune system to display fragments of pathogens, so-called antigens. Immune cells present these antigens on their surface and in this way communicate with one another: antigens are the "wanted posters" of the virus or the bacterium which has to be destroyed.

The researchers discovered the important role of Beta-Interferon in mice lacking the gene for Beta-Interferon. These mice displayed poor immune responses. "Without those knock-out mice we would not have been able to identify the impact of Beta-Interferon on the immune system," says Siegfried Weiß, leader of the Molecular Immunology group at the HZI. His research assistant, the scientist Natalia Zietara, investigated what Beta-Interferon is doing in immune cells. She found a molecular factor that is pivotal in producing the pathogen's profile and which is regulated by Beta-Interferon. The factor belongs to a group of proteins that is usually produced in conditions of stress. Without Beta-Interferon, no active stress protein – without stress protein, no wanted poster – without wanted poster, no immune response.

"We now have a far better understanding of how immune responses start, but also how diseases like autoimmune diseases may develop," says Weiß: without Beta-Interferon, the immune system may not be able to learn how to tolerate itself during the embryonic phase and that it should not fight against self-structures. "Our findings can help to develop or improve new therapeutics to combat autoimmune diseases such as multiple sclerosis or cancer."

 


Story Source:

The above story is based on materials provided by Helmholtz Association of German Research Centres. Note: Materials may be edited for content and length.


Journal Reference:

  1. Zietara N, Łyszkiewicz M, Gekara N, Puchałka J, Dos Santos VA, Hunt CR, Pandita TK, Lienenklaus S, Weiss S. Absence of IFN-beta impairs antigen presentation capacity of splenic dendritic cells via down-regulation of heat shock protein 70. J Immunol., 2009 Jul 15;183(2):1099-109

Cite This Page:

Helmholtz Association of German Research Centres. "The Right Messenger For A Healthy Immune Response." ScienceDaily. ScienceDaily, 11 August 2009. <www.sciencedaily.com/releases/2009/07/090720102016.htm>.
Helmholtz Association of German Research Centres. (2009, August 11). The Right Messenger For A Healthy Immune Response. ScienceDaily. Retrieved April 18, 2014 from www.sciencedaily.com/releases/2009/07/090720102016.htm
Helmholtz Association of German Research Centres. "The Right Messenger For A Healthy Immune Response." ScienceDaily. www.sciencedaily.com/releases/2009/07/090720102016.htm (accessed April 18, 2014).

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