Featured Research

from universities, journals, and other organizations

Vitamin D deficiency linked with airway changes in children with severe asthma

Date:
September 22, 2011
Source:
American Thoracic Society
Summary:
Children with severe therapy-resistant asthma (STRA) may have poorer lung function and worse symptoms compared to children with moderate asthma, due to lower levels of vitamin D in their blood, according to researchers. Lower levels of vitamin D may cause structural changes in the airway muscles of children with STRA, making breathing more difficult. The study provides important new evidence for possible treatments for the condition.

Children with severe therapy-resistant asthma (STRA) may have poorer lung function and worse symptoms compared to children with moderate asthma, due to lower levels of vitamin D in their blood, according to researchers in London. Lower levels of vitamin D may cause structural changes in the airway muscles of children with STRA, making breathing more difficult. The study provides important new evidence for possible treatments for the condition.

Related Articles


The findings were published online ahead of the print edition of the American Thoracic Society's American Journal of Respiratory and Critical Care Medicine.

"This study clearly demonstrates that low levels of vitamin D are associated with poorer lung function, increased use of medication, worse symptoms and an increase in the mass of airway smooth muscle in children with STRA," said Atul Gupta, MRCPCH, M.D., a researcher from Royal Brompton Hospital and the National Heart and Lung Institute (NHLI) at Imperial College and King's College London. "It is therefore plausible that the link between airway smooth muscle mass and lung function in severe asthma may be partly explained by low levels of vitamin D."

While most children with asthma can be successfully treated with low doses of corticosteroids, about 5 to 10 percent of asthmatic children do not respond to standard treatment. These children have severe therapy-resistant asthma, or STRA, experience more asthma episodes and asthma-related illnesses, and require more healthcare services, than their treatment-receptive peers.

Although previous studies of children with asthma have linked increases in airway smooth muscle mass with poorer lung function and in vitro studies have established a connection between levels of vitamin D and the proliferation of airway smooth muscle, this is the first study to evaluate the relationship between vitamin D and the pathophysiology of children with STRA.

"Little is known about vitamin D status and its effect on asthma pathophysiology in these patients," Dr. Gupta noted. "For our study, we hypothesized that children with STRA would have lower levels of vitamin D than moderate asthmatics, and that lower levels of vitamin D would be associated with worse lung function and changes in the airway muscle tissue."

The researchers enrolled 86 children in the study, including 36 children with STRA, 26 with moderate asthma and 24 non-asthmatic controls, and measured the relationships between vitamin D levels and lung function, medication usage and symptom exacerbations.The researchers also examined tissue samples from the airways of the STRA group to evaluate structural changes in the airway's smooth muscle.

At the conclusion of the study the researchers found children with STRA had significantly lower levels of vitamin D, as well as greater numbers of exacerbations, increased use of asthma medications and poorer lung function compared to children with moderate asthma and non-asthmatic children. Airway muscle tissue mass was also increased in the STRA group.

"The results of this study suggest that lower levels of vitamin D in children with STRA contribute to an increase in airway smooth muscle mass, which could make breathing more difficult and cause a worsening of asthma symptoms," Dr. Gupta said.

The findings suggest new treatment strategies for children suffering from difficult-to-treat asthma, he added.

"Our results suggest that detecting vitamin D deficiency in children with STRA, and then treating that deficiency, may help prevent or reduce the structural changes that occur in the airway smooth muscle, which in turn may help reduce asthma-related symptoms and improve overall lung function," Dr. Gupta said.

Before any widespread treatment recommendations can be made, however, larger studies will need to be conducted to confirm the results, he added.

"The determination of the exact mechanism between low vitamin D and airway changes that occur in STRA will require intervention studies," Dr. Gupta said. "Hopefully, the results of this and future studies will help determine a new course of therapy that will be effective in treating these children."


Story Source:

The above story is based on materials provided by American Thoracic Society. Note: Materials may be edited for content and length.


Journal Reference:

  1. A. Gupta, A. Sjoukes, D. Richards, W. Banya, C. Hawrylowicz, A. Bush, S. Saglani. Relationship Between Serum Vitamin D, Disease Severity and Airway Remodeling in Children with Asthma. American Journal of Respiratory and Critical Care Medicine, 2011; DOI: 10.1164/rccm.201107-1239OC

Cite This Page:

American Thoracic Society. "Vitamin D deficiency linked with airway changes in children with severe asthma." ScienceDaily. ScienceDaily, 22 September 2011. <www.sciencedaily.com/releases/2011/09/110922134540.htm>.
American Thoracic Society. (2011, September 22). Vitamin D deficiency linked with airway changes in children with severe asthma. ScienceDaily. Retrieved December 29, 2014 from www.sciencedaily.com/releases/2011/09/110922134540.htm
American Thoracic Society. "Vitamin D deficiency linked with airway changes in children with severe asthma." ScienceDaily. www.sciencedaily.com/releases/2011/09/110922134540.htm (accessed December 29, 2014).

Share This


More From ScienceDaily



More Health & Medicine News

Monday, December 29, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

New Lab Flask Helps Turn CO2 Into Medicine

New Lab Flask Helps Turn CO2 Into Medicine

Reuters - Innovations Video Online (Dec. 29, 2014) The traditional round-bottom glass used by chemists for generations could be under threat after Danish scientists invent a new two-chamber flask that can change CO2 into medicine, while protecting against contact with dangerous chemicals. Jim Drury went to see how it worked. Video provided by Reuters
Powered by NewsLook.com
Homes Built on Toxic Site Despite EPA Warnings

Homes Built on Toxic Site Despite EPA Warnings

AP (Dec. 29, 2014) Thousands of pages of documents show federal regulators knew as early as 1991 that a North Carolina site potentially threatened the surrounding community's water and air, but failed to order a cleanup or warn nearby residents of the dangers. (Dec. 29) Video provided by AP
Powered by NewsLook.com
The Weirdest Health Studies Of 2014

The Weirdest Health Studies Of 2014

Newsy (Dec. 27, 2014) One of this year's strangest studies found people prefer painful electric shocks to being alone with their thoughts. Video provided by Newsy
Powered by NewsLook.com
Healthier Lifestyles Could Prevent 4 In 10 Cancer Cases

Healthier Lifestyles Could Prevent 4 In 10 Cancer Cases

Newsy (Dec. 26, 2014) If patients had led healthier lifestyles, Cancer Research UK found about 40 percent of cancer cases could have been prevented. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Health & Medicine

Mind & Brain

Living & Well

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins