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Research reveals exactly how coughing is triggered by environmental irritants
Date:11/23/2009

Scientists have revealed how environmental irritants such as air pollution and cigarette smoke cause people to cough, in research published today in the American Journal of Respiratory and Critical Care Medicine. The authors of the study, from Imperial College London and the University of Hull, have identified the reaction inside the lungs that can trigger coughing when a person is exposed to particular irritants in the air. They suggest that their findings may ultimately lead to the development of new treatments for chronic coughing.

Coughing is the most common reason for people visiting a family doctor. Treatment options are limited for people with chronic coughing; a recent study concluded that over-the-counter remedies are ineffective and there is increasing concern about the safety of these therapies in children.

Today's study indicates, for the first time, how coughing can be triggered when a person is exposed to certain irritants in the air. It shows that the irritants can switch on receptor proteins called TRPA1 on the surface of nerve endings in the lungs. This switches on sensory nerves, which then trigger a cough reflex. The researchers say coughing could potentially be treated by blocking TRPA1 receptors, to stop irritants in the air from setting off this chain reaction. They hope that this could ultimately help millions of people whose lives are affected by chronic coughing.

Professor Maria Belvisi, corresponding author of the study from the National Heart and Lung Institute at Imperial College London, said: "For some people, chronic coughing can be annoying and uncomfortable, but for others it can be distressing and can have a severe impact on their quality of life. Many people say that certain things in the air can make them cough and we are very excited that we have shown, for the first time, exactly what is probably happening inside the lungs. Now that we think we have cracked the mechanism, we can start inv
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Contact: Lucy Goodchild
lucy.goodchild@imperial.ac.uk
44-207-594-6702
Imperial College London
Source:Eurekalert

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