Featured Research

from universities, journals, and other organizations

Cellular mechanisms leading to immune response in airway epithelium

Date:
November 25, 2010
Source:
Boston University Medical Center
Summary:
Researchers have demonstrated that commensal species of the genus Neisseriae are low inducers of human airway epithelial cell responses as compared to the pathogenic species.

Researchers from the Boston University School of Medicine (BUSM) have demonstrated that commensal species of the genus Neisseriae are low inducers of human airway epithelial cell responses as compared to the pathogenic species. Specifically, the study indicates that a Neisserial outer membrane component appears to play a differential role in the host inflammatory responses via interaction with a receptor on the surface of human airway epithelial cells.

Paola Massari, an assistant professor in the section of infectious diseases at BUSM, is lead author of this study, which is published in the Dec. 2010 issue of the journal Infection and Immunity.

The team focused their research on Neisseria lactamica, a gram negative organism comprising both commensal and pathogenic bacteria. Neisseria meningitidis, the causative agent of meningococcal meningitis, as well as Neisseria lactamica, colonize the human nasopharynx, but only Neisseria meningitidis is pathogenic.

"We set out to understand the relationship between commensal Neisseriae organisms and the human hosts," said Massari. "Although Neisseriae organisms express mostly identical surface antigens and structures, they appear to induce different responses when they interact with the host."

To examine how the bacteria interact with human nasopharyngeal cells, Massari and her research team honed in on a bacterial surface component, the PorB porin, present in all Neisseriae organisms. After purifying the PorB, they found that the protein from the commensal bacteria induced lower levels of human airway epithelial cell activation compared to PorB purified from the pathogenic organisms.

Next, the team demonstrated that PorB from N. lactamica and PorB from N. meningitidis appear to interact with the host cell surface receptor, Toll-like receptor 2 (TLR2), in a differential manner, thus leading to different inflammatory responses in human airway epithelial cells.

"This study confirms that TLR2 signaling is essential for the activation of human airway epithelial cells," said Massari. "This is likely one of the mechanisms by which the body limits inflammation in response to colonization with harmless commensal bacteria, thus avoiding exacerbation of inflammatory responses and local chronic local inflammation.


Story Source:

The above story is based on materials provided by Boston University Medical Center. Note: Materials may be edited for content and length.


Journal Reference:

  1. X. Liu, L. M. Wetzler, L. Oliveira Nascimento, P. Massari. Human Airway Epithelial Cell Responses to Neisseria lactamica and Purified Porin via Toll-Like Receptor 2-Dependent Signaling. Infection and Immunity, 2010; 78 (12): 5314 DOI: 10.1128/IAI.00681-10

Cite This Page:

Boston University Medical Center. "Cellular mechanisms leading to immune response in airway epithelium." ScienceDaily. ScienceDaily, 25 November 2010. <www.sciencedaily.com/releases/2010/11/101123151730.htm>.
Boston University Medical Center. (2010, November 25). Cellular mechanisms leading to immune response in airway epithelium. ScienceDaily. Retrieved September 30, 2014 from www.sciencedaily.com/releases/2010/11/101123151730.htm
Boston University Medical Center. "Cellular mechanisms leading to immune response in airway epithelium." ScienceDaily. www.sciencedaily.com/releases/2010/11/101123151730.htm (accessed September 30, 2014).

Share This



More Health & Medicine News

Tuesday, September 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

How 'Yes Means Yes' Defines Sexual Assault

How 'Yes Means Yes' Defines Sexual Assault

Newsy (Sep. 29, 2014) Aimed at reducing sexual assaults on college campuses, California has adopted a new law changing the standard of consent for sexual activity. Video provided by Newsy
Powered by NewsLook.com
Scientists May Have Found An Early Sign Of Pancreatic Cancer

Scientists May Have Found An Early Sign Of Pancreatic Cancer

Newsy (Sep. 29, 2014) Researchers looked at 1,500 blood samples and determined people who developed pancreatic cancer had more branched chain amino acids. Video provided by Newsy
Powered by NewsLook.com
Colo. Doctors See Cluster of Enterovirus Cases

Colo. Doctors See Cluster of Enterovirus Cases

AP (Sep. 29, 2014) Doctors at the Children's Hospital of Colorado say they have treated over 4,000 children with serious respiratory illnesses since August. Nine of the patients have shown distinct neurological symptoms, including limb weakness. (Sept. 29) Video provided by AP
Powered by NewsLook.com
Dr.'s Unsure of Cause of Fast-Spreading Virus

Dr.'s Unsure of Cause of Fast-Spreading Virus

AP (Sep. 29, 2014) Doctors at the Children's Hospital of Colorado say they have treated over 4,000 children with serious respiratory illnesses since August. Nine of the patients have shown distinct neurological symptoms, including limb weakness. (Sept. 29) Video provided by AP
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