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Rewiring DNA circuitry could help treat asthma
Date:7/5/2012

Reprogramming asthma-promoting immune cells in mice diminishes airway damage and inflammation, and could potentially lead to new treatments for people with asthma, researchers have found.

The researchers were able to reprogram the asthma-promoting cells (called Th2 (T-helper 2) cells) after identifying an enzyme that modifies the DNA of these cells. The enzyme could be a target for the development of new treatments for chronic inflammatory diseases, in particular allergic asthma, caused by an excess of Th2 cells.

Walter and Eliza Hall Institute researcher Dr Rhys Allan led the research while working at Institut Curie, Paris. The research team from Institut Curie, National Centre for Scientific Research (CNRS), France, National Institute of Health and Medical Research (INSERM), France, and Montpellier Cancer Research Institute published the study today in the journal Nature.

Dr Allan said the research team discovered that the enzyme Suv39h1 could switch off genes to control the function of Th2 cells, which are key to the allergic response.

"Th2 cells have an important function in the immune response, but they also play a significant role in diseases such as allergic asthma," Dr Allan said. "People with asthma have too many Th2 cells, which produce chemical signals that inflame and damage the upper airways. In this study, we discovered that the Suv39h1 enzyme plays a critical role in programming these asthma-promoting cells, making it a potential target for new therapies to treat asthma."

More than two million Australians have asthma approximately one in 10 people and the disease is even more common among Indigenous Australians. The prevalence of asthma in children in Australia is among the highest in the world. Dr Allan said the Suv39h1 enzyme was part of the 'epigenetic circuitry' of Th2 cells.

"Epigenetics refers to changes or modifications in the DNA that alter how genes are switched on and off,
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Contact: Liz Williams
williams@wehi.edu.au
61-405-279-095
Walter and Eliza Hall Institute
Source:Eurekalert

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