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New protein found in immune cells

Date:
October 7, 2015
Source:
Albert-Ludwigs-Universität Freiburg
Summary:
Immunobiologists have discovered Kidins220/ARMS in B cells, and demonstrate its functions. B lymphocytes, also known as B cells, are the only cells to produce antibodies, which the immune system needs to fight off foreign intruders like pathogens in order to protect the human body.
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Artwork painted by the daughter of researcher Susana Minguet: The protein Kidins220 (yellow) interacts with the B cell receptor (red and orange).
Credit: Susana Minguet

Researchers of the University of Freiburg have discovered Kidins220/ARMS in B cells. They also determined that it plays a decisive role in the production of antibodies and the formation of B cells, which are a type of white blood cells. Various teams of researchers had already found that Kidins220/ARMS is present in nerve cells and in T cells of the immune system. However, that it is present in B cells was unknown until now. "We've discovered a new molecular player in the immune system," said the immunobiologist Prof. Dr. Wolfgang Schamel, adding, "This knowledge could help to develop new medications for autoimmune diseases or other illnesses in the future." The postdoc Dr. Gina J. Fiala from Schamel's lab is the lead author of the group's publication in the Journal of Experimental Medicine. Fiala studied Kidins220/ARMS in B cells for her doctoral thesis. Several other members of the cluster of excellence BIOSS Centre for Biological Signalling Studies also collaborated in this study.

B lymphocytes, also known as B cells, are the only cells to produce antibodies, which the immune system needs to fight off foreign intruders like pathogens in order to protect the human body. On their surface, B cells carry B cell receptors. These activate the B cells when an antigen -- a substance on the surface of a pathogenic germ -- binds to them. The team of scientists from the University of Freiburg has discovered that Kidins220/ARMS interacts with the B cell receptor and affects signalling pathways from the receptor to the interior of the cell. Without Kidins220/ARMS, the receptor's ability to send signals is limited. As a result, the B cells manufacture less antibodies and the immune system is weakened.

Kidins220/ARMS is also vital for the formation of B cells. If a mouse cannot produce this protein, the B lymphocytes develop in a way that makes them less functional than the B cells of a healthy immune system. The reason for this is that B cells depend on the signals from the B cell receptor and pre-B cell receptor, which is the early version of a B cell receptor, at various stages of their development. Deficiency in Kidins220/ARMS therefore obstructs the development of B cells.


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Materials provided by Albert-Ludwigs-Universität Freiburg. Note: Content may be edited for style and length.


Journal Reference:

  1. Gina J. Fiala, Iga Janowska, Fabiola Prutek, Elias Hobeika, Annyesha Satapathy, Adrian Sprenger, Thomas Plum, Maximilian Seidl, Jörn Dengjel, Michael Reth, Fabrizia Cesca, Tilman Brummer, Susana Minguet, and Wolfgang W.A. Schamel. Kidins220/ARMS binds to the B cell antigen receptor and regulates B cell development and activation. The Journal of Experimental Medicine, October 2015 DOI: 10.1084/jem.2014127

Cite This Page:

Albert-Ludwigs-Universität Freiburg. "New protein found in immune cells." ScienceDaily. ScienceDaily, 7 October 2015. <www.sciencedaily.com/releases/2015/10/151007084255.htm>.
Albert-Ludwigs-Universität Freiburg. (2015, October 7). New protein found in immune cells. ScienceDaily. Retrieved May 24, 2017 from www.sciencedaily.com/releases/2015/10/151007084255.htm
Albert-Ludwigs-Universität Freiburg. "New protein found in immune cells." ScienceDaily. www.sciencedaily.com/releases/2015/10/151007084255.htm (accessed May 24, 2017).

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