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New treatment approach for allergic asthma
16 May 2019
A potential new treatment for asthma that works by targeting the cause of the disease, rather than just masking its symptoms, has been revealed in a study published today in the Journal of Clinical Investigation Insight.
Dr Rhys Allan have identified a potential new treatment
for asthma
Preclinical findings show how a drug, currently well tolerated in clinical trials for cancer, is able to ‘switch off’ and reverse the uncontrolled inflammation responsible for driving and exacerbating asthma.
The research was led by Dr Rhys Allan, Dr Christine Keenan and Professor Stephen Nutt at the Walter and Eliza Hall Institute of Medical Research, along with collaborators at the University of Newcastle.
At a glance
- A drug currently in clinical trials for cancer could offer a potential new treatment option for asthma.
- The drug works by ‘switching off’ the allergic reaction that leads to uncontrolled inflammation in the lungs.
- This new approach is promising because it would target the cause of the disease, not just the symptoms.
One in nine people in Australia have asthma and Melbourne has one of the highest incidences of the disease in the world.
Current asthma medicines such as airway relieving inhalers only serve to ease the symptoms of chest tightness, shortness of breath and coughing. Anti-inflammatory steroids are associated with many side-effects. And recent developments in targeted injectable therapies are very expensive. Furthermore, none of these medicines cure the disease, so new and improved options are urgently needed.
A game-changer for asthma treatment
Dr Keenan said the team’s research could dramatically improve the future of asthma treatment because they had identified a small molecule inhibitor, or drug, that could target the cause of disease, rather than just alleviating the symptoms.
“I have been researching asthma in the preclinical setting for a long time and have never seen a treatment wipe out signs of an allergic immune response like this before. It’s exciting because these findings could be the stepping stone to developing an effective new treatment for allergic asthma,” she said.
Reversing asthma-causing inflammation
Asthma is a long-term lung condition that currently has no cure. People with asthma react to environmental triggers such as pollen and dust mites. The uncontrolled inflammation associated with this allergic reaction restricts airways, increases mucus and makes it hard to breathe.
Dr Allan said the researchers, who are experts in the epigenetic regulation of gene expression, set out to use their knowledge to target and arrest the cause of uncontrolled inflammation.
“Our early research identified that the enzyme Ezh2, which is an essential component of the epigenome, was critical to the immune system’s ability to drive inflammation in response to allergens. This indicated that an Ezh2 inhibitor drug could effectively suppress inflammation in an allergic response,” he said.
Through a series of laboratory studies the researchers showed that the inhibition of Ezh2 could dampen the overreaction by immune T cells that lead to uncontrolled inflammation in the lungs, as well as reverse any established inflammation associated with asthma.
“Interestingly, the Ezh2 inhibitor used in our study is currently in clinical trials for blood cancer,” Dr Allan said. “Because the drug is already well tolerated in humans, it’s reasonable to expect that the transition from oncology to treatments for inflammation should be smooth. We hope that this study illuminates the way forward for further investigation into a highly targeted and effective medicine for asthma,” he said.
The research was supported by the American Asthma Foundation, the National Health and Medical Research Council and the Australian Government.
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Institute researchers are searching for new ways to treat thunderstorm and chronic allergic asthmas by targeting the immune cells that drive asthma.