Navigation Links
Self-regulation of the immune system suppresses defense against cancer
Date:12/21/2011

It is vital that the body's own immune system does not overreact. If its key players, the helper T cells, get out of control, this can lead to autoimmune diseases or allergies. An immune system overreaction against infectious agents may even directly damage organs and tissues.

Immune cells called regulatory T cells ("Tregs") ensure that immune responses take place in a coordinated manner: They downregulate the dividing activity of helper T cells and reduce their production of immune mediators. "This happens through direct contact between regulatory cell and helper cell," says Prof. Peter Krammer of DKFZ. "But we didn't know yet what this contact actually causes in helper cells." The researchers' hypothesis was that the contact with the Tregs affects certain steps in the complex signaling cascade that leads to the activation of the helper T cells.

If the T cell receptor, a sensor molecule on the surface of helper cells, senses foreign or damaged protein molecules, this will trigger a cascade of biochemical activation reactions. At the end of this signaling cascade, genes that are required for an immune attack will be read in the nucleus of helper cells.

Jointly with colleagues from several German research institutes, Peter Krammer, Angelika Schmidt and co-workers have now compared the signaling cascades in helper cells with and without contact to Tregs. The immunologists found out that a short contact of the two types of cells in the culture dish is sufficient to suppress the helper cells. Following Treg contact, the typical release of calcium ions into the plasma of helper cells does not occur. As a result, two important transcription factors, NFkappaB and NFAT, do no longer function. They normally activate genes for immune mediators, thus alerting the immune system.

"The mode of action of Tregs is of great importance for cancer medicine. Many of our colleagues have shown in various types of cancer that Tregs can downregulate the immune response against tumors so that transformed cells escape the immune defense. This can contribute to the development and spread of cancer. We are therefore searching for ways to reactivate such suppressed helper cells," said Krammer, explaining the goals of his work. For developing immune therapies against cancer it is also crucial to understand how Tregs work. The researchers are trying to prevent that immune cells which have been painstakingly activated against cancer in the culture dish are immediately suppressed again by Tregs.


'/>"/>
Contact: Dr. Sibylle Kohlstdt
s.kohlstaedt@dkfz.de
Helmholtz Association of German Research Centres
Source:Eurekalert

Related medicine news :

1. Severe Sepsis Can Harm the Immune System
2. Team pinpoints amino acid variation in immune response gene linked with ulcerative colitis
3. Researchers investigate link between autoimmune diseases and wounds that dont heal
4. Pep talk can revive immune cells exhausted by chronic viral infection
5. Penn researchers repair immune system in leukemia patients following chemotherapy
6. Traumatic injury sets off a genomic storm in immune system pathways
7. Autoimmune Woes May Raise Risk for Lung Clots
8. U-M Medical School and MedImmune join forces to accelerate search for new therapies
9. NBA players not immune to serious illness from norovirus
10. Nobel Laureate Bruce Beutler on molecular sensors as a trigger for autoimmune disease
11. Rebooting the system: Immune cells repair damaged lung tissues after flu infection
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/20/2017)... ... January 20, 2017 , ... “Mary Magdalene: Grace is ... life of the woman who witnessed Jesus Christ firsthand. “Mary Magdalene: Grace is Greater ... spent her career as an educator interacting with countless women who had little knowledge ...
(Date:1/20/2017)... ... 2017 , ... “Code Word: Chocolate Biscuit”: a biographical account following a man who went on ... of published author, Marlyn Ivey, born in Lynn Haven, Florida and at the age of ... 19 years of age, he joined the Navy and got married right out of boot ...
(Date:1/20/2017)... ... January 20, 2017 , ... D ... Expiratory Pressure (OPEP) device, was featured in a study indicating superior performance against ... FAARC, “Analysis of Three Oscillating Positive Expiratory Pressure Devices During Simulated Breathing“ ...
(Date:1/20/2017)... ... ... and enchanting tale that teaches children the true meaning of Christmas. “Journey to Christmas” is ... a devoted woman of faith. , “Becoming a parent changes you. In my case, ... for years, but actually doing it might have been a while in coming if it ...
(Date:1/20/2017)... ... January 20, 2017 , ... “The Land of More ... to the issue of world hunger, and shares the simple and achievable answer. “The ... husband and member of the Fairview Missionary Church in Angola, Indiana where he works ...
Breaking Medicine News(10 mins):
(Date:1/19/2017)... NEW YORK , Jan. 19, 2017 /PRNewswire/ ... reach USD 233.7 billion by 2025, according to ... The market is anticipated to be predominantly driven ... companies, resulting into the large-scale production of new ... widen the influx of drugs at an unprecedented ...
(Date:1/19/2017)... The Global Therapy Partnering Terms and Agreements ... deals and agreements entered into by the world,s leading ... Top deals by value - Deals listed by company ... The report provides understanding and access to the partnering ... healthcare companies. The report provides an analysis of ...
(Date:1/19/2017)... and Webcast to Follow Vanda Pharmaceuticals Inc. (Vanda) (NASDAQ: ... the fourth quarter of 2016 on Wednesday, February 15, 2017, after ... ... on Wednesday, February 15, 2017, during which management will discuss the ... activities. To participate in the conference call, please dial 1-888-771-4371 (domestic) ...
Breaking Medicine Technology: