Monday, January 21, 2013

Asthma researchers make breakthrough in attacks related to colds and allergens

Pediatric and respiratory researchers from the University of Newcastle, along with national and international collaborators, are a step closer to identifying the source of serious virus-and allergen-induced asthma attacks after detecting important molecular signals generated very early in the disease process.

Led by Professor Joerg Mattes, the team of researchers and clinicians spent several years investigating the mechanisms that trigger airway inflammation and cause asthma attacks.

The pre-clinical study targeted the common cold (rhinovirus), which is the virus that causes most asthma attacks; and the effects caused by allergens such as house dust mites.

“Asthmatics experience severe and prolonged symptoms when infected with the common cold virus or exposed to allergens, both of which promote inflammation in the lungs and production of mucus," Professor Mattes said.

“Asthma attacks are currently treated similarly regardless of whether they are caused by viruses or allergens. However virus-induced effects are much less responsive to current therapies, which is why this investigation is so important.”

A comprehensive gene expression analysis led to the initial discovery of the signals – proteins otherwise known as midline 1 and protein phosphatase 2A.

“The proteins are generated in the innermost layer of the airways, where the body has first contact with allergens and viruses, and once activated they appear to modulate many other disease factors,” Dr Adam Collison**, one of the study authors from Professor Mattes’ research team, said. “Obviously it is better to target these earlier signals rather than the hundreds of downstream effects.”

The researchers have already begun testing therapeutic strategies to modify the pathway, setting a platform for the development of targeted drugs ahead of full clinical trialling.

“We have seen that this pathway operates in the cells of asthmatics, and our pre-clinical disease models showed that we can inhibit the pathway and protect against the development of both virus- and allergen-induced asthma,” Professor Mattes said.

He advised sufferers to be vigilant with their asthma management during late summer and winter, the worst times for cold epidemics.

The results are published in Nature Medicine, the world’s leading journal for biomedical research. Researchers from the University of New South Wales, the University of Cincinnati and the Imperial College London took part in the investigation. 

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