Study identifies genetic anomaly associated with poor response to common asthma treatment
Cleveland Clinic-led findings may be clinically useful in personalizing asthma treatments
Credit: Cleveland Clinic
Monday, January 13, 2020, CLEVELAND: A new Cleveland Clinic study has uncovered a genetic anomaly associated with poor response to a common asthma treatment. The findings, published in Proceedings of the National Academy of Sciences, showed that asthmatic patients with the gene variant are less likely to respond to glucocorticoids and often develop severe asthma.
The research team, led by Nima Sharifi, M.D., of Cleveland Clinic’s Lerner Research Institute, identified that the gene variant HSD3B1(1245A) is associated with glucocorticoid response and may be clinically useful to identify patients most likely to benefit from other treatments.
“Glucocorticoids, which modulate systemic inflammatory response, are commonly prescribed to treat severe asthma. However, until now we have not understood why many patients do not benefit from them,” said Dr. Sharifi, senior author of the article. “These findings make the case for genetic testing and personalized treatment and provide important information for identifying which patients should be treated using different therapies.”
In the study, Dr. Sharifi and his collaborators retrospectively analyzed the association between patient genomes and lung function in more than 500 asthmatic patients who received daily oral glucocorticoids treatment or no glucocorticoids treatment.
They found that a change to the gene HSD3B1 – specifically the HSD3B1(1245A) variant – is associated with poor lung function and glucocorticoid treatment resistance. The analysis revealed that among patients receiving glucocorticoids, those with the variant had poorer lung function than those who did not have the genetic anomaly, suggesting that it contributes to resistance and helps drive the progression to severe asthma.
Previous studies have shown that HSD3B1 encodes an enzyme that converts less active hormones called androgens into more powerful androgens. While additional research is necessary, the team suspects that HSD3B1(1245A)’s effect on lung function may be attributed to inhibition of this process.
“This study is the first to provide genetic evidence suggesting that variants related to androgen synthesis affect glucocorticoids treatment resistance in asthma or any other inflammation-related disease,” said Joe Zein, M.D., first author on the study and a practicing pulmonologist in Cleveland Clinic’s Respiratory Institute. “These findings provide us with important new information that may lead to more tailored treatments for asthma patients and the ability to prevent the development of severe disease.”
Asthma is a chronic condition that causes the airways of the lungs to narrow, the lining of the airways to become inflamed and the cells that line the airways to produce more mucus, making it difficult to take in enough air. According to the CDC, about 25 million people in the U.S. have asthma, including more than six million children. Asthma accounts for nearly two million emergency department visits each year.
Previously, Dr. Sharifi’s laboratory has extensively studied the role of HSD3B1 in prostate cancer. In 2013, he made the seminal discovery that prostate cancer cells with the HSD3B1(1245C) variant survive androgen deprivation therapy, the first line of defense against prostate cancer, by producing their own disease-fueling androgens. He has spent more than seven years studying and publishing peer-reviewed articles on the variant’s effect in prostate cancer.
Dr. Sharifi holds the Kendrick Family Chair for Prostate Cancer Research at Cleveland Clinic and directs the Cleveland Clinic Genitourinary Malignancies Research Center. He has joint appointments in the Glickman Urological & Kidney Institute and Taussig Cancer Institute. In 2017, he received the national Top Ten Clinical Achievement Award from the Clinical Research Forum for his discoveries linking HSD3B1(1245C) with poor prostate cancer outcomes.
Dr. Zein is a member of the Cleveland Clinic Asthma Center, which provides a comprehensive approach to asthma management and care along with innovative research, offering patients access to the most advanced diagnostic testing and innovative treatments.
This study was supported by the National Heart, Lung, and Blood Institute and the National Cancer Institute, both of the National Institutes of Health.
About Cleveland Clinic
Cleveland Clinic is a nonprofit multispecialty academic medical center that integrates clinical and hospital care with research and education. Located in Cleveland, Ohio, it was founded in 1921 by four renowned physicians with a vision of providing outstanding patient care based upon the principles of cooperation, compassion and innovation. Cleveland Clinic has pioneered many medical breakthroughs, including coronary artery bypass surgery and the first face transplant in the United States. U.S. News & World Report consistently names Cleveland Clinic as one of the nation’s best hospitals in its annual “America’s Best Hospitals” survey. Among Cleveland Clinic’s 66,000 employees are more than 4,200 salaried physicians and researchers and 16,600 nurses, representing 140 medical specialties and subspecialties. Cleveland Clinic’s health system includes a 165-acre main campus near downtown Cleveland, 11 regional hospitals in northeast Ohio, more than 180 northern Ohio outpatient locations – including 18 full-service family health centers and three health and wellness centers – and locations in southeast Florida; Las Vegas, Nev.; Toronto, Canada; Abu Dhabi, UAE; and London, England. In 2018, there were 7.9 million total outpatient visits, 238,000 hospital admissions and observations, and 220,000 surgical cases throughout Cleveland Clinic’s health system. Patients came for treatment from every state and 185 countries. Visit us at clevelandclinic.org. Follow us at twitter.com/CCforMedia and twitter.com/ClevelandClinic. News and resources available at newsroom.clevelandclinic.org.
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