Navigation Links
T cell immunity enhanced by timing of interleukin-7 therapy
Date:2/1/2008

MADISON -- That the cell nurturing growth factor interleukin-7 can help ramp up the ability of the immune system to remember the pathogenic villains it encounters is well known.

But precisely how this natural protein works its magic on the cells of the immune system is not well understood. Now, however, in research that may have implications for developing vaccines against HIV and cancer, a team of scientists from the University of Wisconsin-Madison has found that the timing of interleuin-7 therapy is critical for increasing the number of killer cells that zero in on and destroy virus-infected cells.

Writing in the current online issue (Feb. 1, 2008) of the Journal of Clinical Investigation, a team led by UW-Madison School of Veterinary Medicine Professor of pathobiological sciences Marulasiddappa Suresh reports that therapeutic administration of interleukin-7 can be linked to a stage of early infection to effectively increase the number of a type of killer cell that recognizes and selectively assassinates virus-infected cells.

"These cells need to get interleukin-7 for their survival," explains Suresh, of the killer immune cell known as CD8 T cells, a type of white blood cell that attacks virus-infected cells, foreign cells and cancer cells. Interleukin-7 is produced in very small amounts in bone marrow, spleen, and the thymus, but scientists have been able to isolate and synthesize the agent, which is now in pre-clinical testing for a variety of conditions.

"This is one of the most exciting cytokines in pre-clinical human trials," says Suresh. "The idea is that it might be used as an immune restorative agent. It is absolutely essential for normal development and functioning of the immune system."

Effectively stimulating the immune system -- the complex of organs and cells that defends the body against infection and disease -- is a grail of biomedical science in the fight against infectious diseases.

Suresh explains that upon infection, the body unleashes an army of T cells to fight infected or rogue cells. But when the body perceives an infection may be contained, the number of T cells it deploys is dramatically reduced. However, a certain number of T cells, known as memory cells and that are capable of recognizing a recently vanquished foe, remain. Stimulating memory T and B cells is the basis of vaccination, but vaccines often do not induce a sufficient number of memory CD8 T cells.

Interleukin-7 is a well-studied growth factor that is known to help generate and maintain the immune system's memory CD8 T cells, which have the ability to remember the identity of its targets, such as cancer cells or cells that have been taken over by a virus. A paucity of interleukin-7 is believed to limit the survival and persistence of memoryCD8 T cells.

Despite the promise of interleukin-7 as a means to bolster immunity, an optimal treatment regimen has yet to be determined.

In studies in mice, Suresh and his colleagues found that T cell memory is best enhanced when interleukin-7 is administered during a phase of infection when the number of T cells is ramping down.

In the new Wisconsin study, Suresh's group gave interleukin-7 to mice during different stages of a viral infection. They found that by administering interleukin-7 when the number of T cells is in decline, it is possible to increase the number of memory CD8 T cells that remain to stand guard and protect against re-infection.

"The purpose of the immune response is to expand these cells," says Suresh, explaining that T cells act like serial killers, snuffing one infected cell after another until the viral infection is controlled.

During the expansion phase of infection, when the body is generating the most T cells, administration of interleukin-7 seems to have no effect, according to Suresh. But during the contraction phase, memory is increased.

"We tried this in a DNA vaccine and it works," says Suresh. "Even with the weakest vaccine, we could increase the memory cells and improve protection against infection. What this shows is that the number of memory cells are not predetermined. You can increase them and interleukin-7 drives their proliferation."


'/>"/>

Contact: Marulasiddappa Suresh
sureshm@svm.vetmed.wisc.edu
608-265-9791
University of Wisconsin-Madison
Source:Eurekalert

Related medicine news :

1. JDRF to establish an autoimmunity center at University of Colorado Denver
2. Chopped up proteins trigger autoimmunity
3. Violent sex acts boost insects immunity system
4. More Energy & Immunity With Vitamin Supplements This Winter
5. CD200 stifles anti-tumor immunity
6. Probiotics Play Critical Role in Pediatric Health and Immunity
7. LifeQuest Announces End of Immunity Health Challenge Contest
8. Brookdale Senior Living Announces Enhanced Web Site
9. NHP Reports Third Quarter 2007 Revenue and FFO Growth and Enhanced Disclosure Information
10. PreViser Launches New Website and Enhanced Version of Its Oral Disease and Risk Assessment Software
11. The American Pain Foundation (APF) and The HealthCentral Network Collaborate to Develop Enhanced Internet Resources for People with Pain
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/5/2016)... Francisco, CA (PRWEB) , ... ... ... intensive lectures and hands-on exercises, the Wharton Seminars for Business Journalists ... a better understanding of key business and economic issues.  This one-day program ...
(Date:5/5/2016)... ... May 05, 2016 , ... Every ... the most heartfelt wishes of these children. The wishes provide hope and ... President and CEO of Make-A-Wish Mississippi, Brent Wilson said, “In 2016, the organization ...
(Date:5/5/2016)... ... ... A recent survey by the Midwest Business Group on Health ... use the free preventive care benefits available to them as part of the Affordable ... public and private employers, MBGH found that only 10% of large employers are aware ...
(Date:5/5/2016)... , ... May 05, 2016 , ... ... Pittsburgh-area schoolchildren has found that more than 40 percent of participating fifth-grade students ... , Director of Allergy and Asthma Clinical Research in the Division of Pulmonary, ...
(Date:5/5/2016)... ... May 05, 2016 , ... ... presented a talk highlighting the organization’s successful Care Transitions program at ... The talk was titled “Minimizing Costs in the Post-Acute Environment Through Effective Transitions ...
Breaking Medicine News(10 mins):
(Date:5/3/2016)... COLOGNE, Germany , May 3, 2016  Axiogenesis has acquired a major investment from Sino-German High-Tech Fund to ... http://photos.prnewswire.com/prnh/20160503/362920    Photo - http://photos.prnewswire.com/prnh/20160503/362921 ... ... ... ...
(Date:5/3/2016)... ACME Markets, Delaware County ... County Councilman Dave White announced today the ... ACME pharmacies across Delaware County . ... naloxone has saved 26,463 lives nationwide over the past 20 years. ... were authorized to administer naloxone to overdose victims, 244 ...
(Date:5/3/2016)...  While you may be familiar with watching a film or TV show in high definition, ... 8MP in the Medical Industry.  Ampronix  is a renowned authorized reseller of the medical industry,s ... - http://photos.prnewswire.com/prnh/20160502/362730 ... ... ...
Breaking Medicine Technology: