Featured Research

from universities, journals, and other organizations

Immune cells use tethered slings to avoid being swept away

Date:
December 17, 2012
Source:
American Society for Cell Biology
Summary:
Neutrophils, critical components of the immune system's response to bacteria and other pathogens, throw out tube-like tethers that act as anchor points, controlling their speed as they roll along the walls of blood vessels during extremely fast blood flow en route to an infection site.

Neutrophils, critical components of the immune system's response to bacteria and other pathogens, throw out tube-like tethers that act as anchor points, controlling their speed as they roll along the walls of blood vessels during extremely fast blood flow en route to an infection site, according to research presented on Dec. 17 at the American Society for Cell Biology Annual Meeting in San Francisco.

To attack a bacterial infection in tissue, neutrophils have to leave the blood stream and approach the infection site through tiny venules that are part of the microcirculation system, according to Prithu Sundd, PhD, who is in the laboratory of Klaus Ley, PhD, at the La Jolla Institute for Allergy and Immunology, La Jolla, CA.

Extensions of the cell membrane, the slings turned out to be vital aids in the navigation because if neutrophils lose control while attempting to enter infected tissue, they can be swept away in the blood flow, which could delay the immune defense mechanism. Flow in these narrow venules is measured as wall shear stress. A shear stress exceeding 2 dyn/cm2 can sweep away other leukocytes, but neutrophils have a special ability to move under control at shear stress 10 times higher.

Shear-resistance in neutrophils was known to be aided by cell flattening and by these mysterious membrane extensions but the details were poorly understood. To determine the exact mechanism behind neutrophils' rolling, Dr. Sundd working with physicist Alex Groisman, PhD, of the University of California, San Diego, to shoot a high-speed video, using total internal reflection fluorescence microscopy to track labeled neutrophils from mouse bone marrow rolling along an artificial venule, all driven by a microfluidic device at a shear stress of 6 to 10 dyn/cm2.

In the 15-second video, the red-dyed neutrophil used its long membrane tether like a sling to anchor itself without being swept away by the high shear force of blood. Instead of a single anchor point, the sling tether is coated by patches of cell adhesion molecules that latched onto the passage walls but peeled loose, patch by patch, as the neutrophil gently rolled forward. At the tether's end, the neutrophil swung it ahead like a lasso to gain new leverage.

The researchers say their dramatic video underscores the complexity of the body's immune system. The slings are not only unique structures, says Dr. Sundd, but may help explain how rolling neutrophils are able to present their antigen-sensing ligands at the blood vessel wall before entering the site of infection.

This study was supported by the NCRP-Scientist Development Grant (11SDG7340005) from American Heart Association (PS), WSA postdoctoral fellowship (10POST4160142-01) from American Heart Association (EKK), and National Institutes of Health (EB02185) (KL).


Story Source:

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


Journal Reference:

  1. Prithu Sundd, Edgar Gutierrez, Ekaterina K. Koltsova, Yoshihiro Kuwano, Satoru Fukuda, Maria K. Pospieszalska, Alex Groisman, Klaus Ley. ‘Slings’ enable neutrophil rolling at high shear. Nature, 2012; 488 (7411): 399 DOI: 10.1038/nature11248

Cite This Page:

American Society for Cell Biology. "Immune cells use tethered slings to avoid being swept away." ScienceDaily. ScienceDaily, 17 December 2012. <www.sciencedaily.com/releases/2012/12/121217140539.htm>.
American Society for Cell Biology. (2012, December 17). Immune cells use tethered slings to avoid being swept away. ScienceDaily. Retrieved September 23, 2014 from www.sciencedaily.com/releases/2012/12/121217140539.htm
American Society for Cell Biology. "Immune cells use tethered slings to avoid being swept away." ScienceDaily. www.sciencedaily.com/releases/2012/12/121217140539.htm (accessed September 23, 2014).

Share This



More Health & Medicine News

Tuesday, September 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Liberia Pleads for Help to Fight Ebola

Liberia Pleads for Help to Fight Ebola

AP (Sep. 22, 2014) Liberia's finance minister is urging the international community to quickly follow through on pledges of cash to battle Ebola. Bodies are piling up in the capital Monrovia as the nation awaits more help. (Sept. 22) Video provided by AP
Powered by NewsLook.com
Ebola Doctor Says Border Controls Critical

Ebola Doctor Says Border Controls Critical

AP (Sep. 22, 2014) A Florida doctor who helped fight the expanding Ebola outbreak in West Africa says the disease can be stopped, but only if nations quickly step up their response and make border control a priority. (Sept. 22) Video provided by AP
Powered by NewsLook.com
Global Ebola Aid Increasing But Critics Say It's Late

Global Ebola Aid Increasing But Critics Say It's Late

Newsy (Sep. 21, 2014) More than 100 tons of medical supplies were sent to West Africa on Saturday, but aid workers say the global response is still sluggish. Video provided by Newsy
Powered by NewsLook.com
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

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