Featured Research

from universities, journals, and other organizations

Study identifies protein that helps prevent active tuberculosis in infected patients

Date:
August 20, 2014
Source:
University of California, Los Angeles (UCLA), Health Sciences
Summary:
A UCLA-led study has identified a protein that appears to play a key role in protecting people infected with the tuberculosis bacteria from developing the active form of the disease. The findings could help doctors identify people who are at the greatest risk for developing disease as well as target new treatment strategies. The study also demonstrates a unique role for Vitamin D -- the protein can only kill the bacteria when there are adequate levels of this vitamin present.

Mycobacterium tuberculosis, which causes TB.
Credit: NIAID

UCLA-led study has identified a protein that appears to play a key role in protecting people infected with Mycobacterium tuberculosis -- the bacterium that causes tuberculosis -- from developing the active form of the disease. The protein, interleukin-32, was discovered to be one biomarker of adequate host defense against TB.

The discovery could help doctors identify people who are at the greatest risk for the highly contagious and potentially fatal lung disease, and it could point the way toward new treatment strategies for TB.

The study, conducted in partnership with researchers from Harvard University School of Public Health and the University of Michigan School of Medicine, was published in the Aug. 20 online edition of the journal Science Translational Medicine.

The findings underscore the importance of maintaining sufficient levels of vitamin D to effectively combat the pathogen that causes TB. The researchers found that the protective protein, interleukin-32, can induce the killing of the TB bacterium only in the presence of sufficient levels of vitamin D.

An estimated one-third of the world's population is infected with tuberculosis, but the disease is latent in 90 to 95 percent of infected people, meaning that they experience no symptoms and are not contagious. Interleukin-32 contributes to maintaining that latent state and preventing active infection. In 2012, nearly 9 million people worldwide became sick with TB and there were 1.3 million TB-related deaths, according to the U.S. Centers for Disease Control and Prevention.

A new urgency for developing new approaches to identify individuals at risk, maintain immunity and treat active disease has arisen in recent years as TB has re-emerged as a global health threat -- thanks in part to the rise of extremely drug-resistant bacteria. "Until now, there had been no way to predict, based on biological factors, why latently infected individuals do not develop active tuberculosis," said Dennis Montoya, a postdoctoral scholar in the division of dermatology at the David Geffen School of Medicine at UCLA and the study's lead author. "We were surprised to find many differences between people with latent TB and healthy people, suggesting that people with latent TB may have activated immune systems that are protecting them from developing active infection." In people with active TB, the disease-causing bacteria have overcome the defenses of the immune system, causing symptoms to develop in the lungs. Previous studies have focused on finding biological markers of disease progression in those patients. The new study, however, was the first to look for markers of protection in the blood of people with latent TB -- those who are infected but have not developed symptoms.

The researchers analyzed gene expression profiles of hundreds of TB patients in four countries, as well as evaluating genes from activated immune cells shown in the laboratory to have the ability to kill the TB bacteria. They discovered that in people who were infected with TB but had higher levels of interleukin-32 (IL-32), the disease was more likely to be latent, and that -- in laboratory experiments -- IL-32 was able to stimulate the immune system to kill TB-causing bacteria, but only in the presence of sufficient vitamin D levels.

Vitamin D is produced in the skin upon exposure to sunlight, but approximately one-third of American adults -- particularly members of ethnic minorities with darker-pigmented skin and lighter-skinned people who receive minimal sun exposure -- lack sufficient levels of vitamin D, and vitamin D deficiency has been found to be associated with a higher risk for active TB.

"When vitamin D levels were low, IL-32 was not able to kill the bacteria," said Dr. Robert Modlin, the Klein Professor of Dermatology at UCLA and the study's senior author. "However, if we simulated the effect of supplementing individuals by adding vitamin D to the culture of the activated immune cells that had low vitamin D levels, IL-32 regained its ability to kill. Our findings suggest that raising standards for daily intake of vitamin D could help to protect against a TB pandemic."

Further studies are needed to determine if vitamin D supplementation helps prevent TB. But Modlin, a dermatologist, favors oral supplementation rather than increased sun exposure, which can increase the risk of skin cancer.

Although TB remains a leading killer in many parts of the world, the incidence of the disease has been declining in the U.S. since a resurgence that peaked in 1992, according to the CDC. A total of 9,945 cases were reported in 2012, and 569 people died from the disease in 2010, the most recent years for which U.S. data are available. In the U.S., unlike in many poorer countries, patients known to have latent TB infections are typically treated with antibiotics to prevent progression to the active disease. But strains of the tuberculosis bacteria are becoming resistant to the antibiotic drugs, increasing the threat of a multidrug-resistant TB pandemic that could affect the U.S.

"Our current strategy of antibiotic therapy, as well as methods of identifying which patients will develop severe disease, have remained essentially unchanged for decades," said Harvard's Barry Bloom, the study's co-author. "Our findings of specific markers in the blood that can tell us which people are at risk can help countries focus limited resources on patients who have lower levels of this protein. In addition, this may point the way to new treatments for a disease that greatly needs them."

The research builds on the team's previous work that found that vitamin D is important for killing TB bacteria.


Story Source:

The above story is based on materials provided by University of California, Los Angeles (UCLA), Health Sciences. The original article was written by Rachel Champeau. Note: Materials may be edited for content and length.


Journal Reference:

  1. D. Montoya, M. S. Inkeles, P. T. Liu, S. Realegeno, R. M. B. Teles, P. Vaidya, M. A. Munoz, M. Schenk, W. R. Swindell, R. Chun, K. Zavala, M. Hewison, J. S. Adams, S. Horvath, M. Pellegrini, B. R. Bloom, R. L. Modlin. IL-32 is a molecular marker of a host defense network in human tuberculosis. Science Translational Medicine, 2014; 6 (250): 250ra114 DOI: 10.1126/scitranslmed.3009546

Cite This Page:

University of California, Los Angeles (UCLA), Health Sciences. "Study identifies protein that helps prevent active tuberculosis in infected patients." ScienceDaily. ScienceDaily, 20 August 2014. <www.sciencedaily.com/releases/2014/08/140820164311.htm>.
University of California, Los Angeles (UCLA), Health Sciences. (2014, August 20). Study identifies protein that helps prevent active tuberculosis in infected patients. ScienceDaily. Retrieved September 22, 2014 from www.sciencedaily.com/releases/2014/08/140820164311.htm
University of California, Los Angeles (UCLA), Health Sciences. "Study identifies protein that helps prevent active tuberculosis in infected patients." ScienceDaily. www.sciencedaily.com/releases/2014/08/140820164311.htm (accessed September 22, 2014).

Share This



More Health & Medicine News

Monday, September 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Sierra Leone in Lockdown to Control Ebola

Sierra Leone in Lockdown to Control Ebola

AP (Sep. 21, 2014) Sierra Leone residents remained in lockdown on Saturday as part of a massive effort to confine millions of people to their homes in a bid to stem the biggest Ebola outbreak in history. (Sept. 20) Video provided by AP
Powered by NewsLook.com
Sierra Leone's Nationwide Ebola Curfew Underway

Sierra Leone's Nationwide Ebola Curfew Underway

Newsy (Sep. 20, 2014) Sierra Leone is locked down as aid workers and volunteers look for new cases of Ebola. Video provided by Newsy
Powered by NewsLook.com
Changes Found In Brain After One Dose Of Antidepressants

Changes Found In Brain After One Dose Of Antidepressants

Newsy (Sep. 19, 2014) A study suggest antidepressants can kick in much sooner than previously thought. Video provided by Newsy
Powered by NewsLook.com
Could Grief Affect The Immune Systems Of Senior Citizens?

Could Grief Affect The Immune Systems Of Senior Citizens?

Newsy (Sep. 19, 2014) The study found elderly people are much more likely to become susceptible to infection than younger adults going though a similar situation. 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:
from the past week

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