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Heparin a key role player in allergy and inflammatory reactions

Date:
February 27, 2011
Source:
Karolinska Institutet
Summary:
Heparin plays a key role in allergic and inflammatory reactions driven by mast cells, scientists show. The study sheds some new light on the biological function of heparin.

Heparin plays a key role in allergic and inflammatory reactions driven by mast cells, scientists from Karolinska Institutet in Sweden shows in an international collaboration involving colleagues from Germany and Switzerland. The study is published in the recent issue of Immunity, and sheds some new light on the biological function of heparin.

Heparin has a long history at Karolinska Institutet, since here the substance was originally purified and its chemical structure was characterized back in 1935 by Professor Erik Jorpes. Knowing about the therapeutic implications Jorpes was one of the pioneers treating patients that suffered from thrombosis with heparin infusions. Today, heparin is still one of the most commonly used anticoagulant drugs.

Professor Jorpes showed that heparin is produced in a specific blood-born cell population, called mast cells. Mast cells have a central function in allergic and inflammatory diseases and contribute to increased vascular permeability, allergic and anaphylactic reactions. The current study identifies the underlying mechanism and its therapeutical implications. The authors show that heparin initiates the production of a hormone -- bradykinin -- that contributes to swelling, anaphylactic and inflammatory symptoms, which are commonly known to be associated with aberrant mast cell activity.

Notably, mast cell-released heparin generates the inflammatory mediator bradykinin via activation of factor XII (the so-called Hageman Factor) that belongs to the blood coagulation system. The study thus provides an unexpected link between the clotting cascade and mast cell-driven pro-inflammatory reactions. Drugs that block bradykinin or factor XII activity protect from adverse mast cell-driven effects in patients and genetically engineered mouse models and could be a new strategy to treat allergic diseases.


Story Source:

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


Journal Reference:

  1. Chris Oschatz, Coen Maas, Bernd Lecher, Thomas Jansen, Jenny Bjφrkqvist, Thomas Tradler, Reinhard Sedlmeier, Peter Burfeind, Sven Cichon, Sven Hammerschmidt, Werner Mόller-Esterl, Walter A. Wuillemin, Gunnar Nilsson, and Thomas Rennι. Mast cells increase vascular permeability by heparin-initiated bradykinin formation in vivo. Immunity, February 25, 2011, Volume 34, Issue 2

Cite This Page:

Karolinska Institutet. "Heparin a key role player in allergy and inflammatory reactions." ScienceDaily. ScienceDaily, 27 February 2011. <www.sciencedaily.com/releases/2011/02/110225090848.htm>.
Karolinska Institutet. (2011, February 27). Heparin a key role player in allergy and inflammatory reactions. ScienceDaily. Retrieved October 20, 2014 from www.sciencedaily.com/releases/2011/02/110225090848.htm
Karolinska Institutet. "Heparin a key role player in allergy and inflammatory reactions." ScienceDaily. www.sciencedaily.com/releases/2011/02/110225090848.htm (accessed October 20, 2014).

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