new way to help asthma sufferers found
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Last Updated : GMT 05:17:37
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New way to help asthma sufferers found

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London - Arabstoday

Scientists may have hit upon an effective way to block asthma attacks by identifying the two most significant biological triggers that bring them on. Researchers from the Universities of California-San Francisco (UCSF), Johns Hopkins and Duke universities demonstrate that these two triggers for asthma are tied to a specific calcium-activated chloride channel, called TMEM16A. They regulate airway secretions and smooth muscle contraction, the two major factors linked with asthma attacks, according to the journal “Proceedings of the National Academy of Sciences”. “Maybe if we could inhibit both of these processes by blocking this one channel, we could affect the two symptoms of asthma,” said senior study author Jason Rock, assistant professor of anatomy at UCSF. Asthma, a respiratory disorder that causes shortness of breath, coughing and chest discomfort, results from changes in the airways that lead to the lungs. It affects 18.7 million adults and 7.0 million children in the US alone, according to the Centres for Disease Control and Prevention. Normally, humans have few mucus-producing cells. Those suffering from asthma, however, have an elevated number of these cells lining the tubes that lead to the lungs. “The overabundance of mucus plugging the airways combined with hyper-contractility of the smooth muscle - when the tubes get really small - make it difficult to move air in or out,” Rock said. “A lot of people equate that feeling with breathing through a straw.” Rock and colleagues focused on a calcium-activated chloride channel called TMEM16A. This channel secretes chloride ions, besides regulating biological processes such as neuron firing, gastrointestinal activity and the secretion of sweat and tears. The authors identified three chemicals that inhibit the channel. “We tested the ability of these chemicals to inhibit TMEM16A and other channels, and we found that they specifically block TMEM16A,” Rock said. “It is great that we came across these molecules that were unknown previously since we can now try to get into clinical trials to benefit patients,” said Rock. From khaleejtimes

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