Navigation Links
Survival niche for cancer cells
Date:6/6/2011

Cancer cells do not grow equally well everywhere in the body. Often, they first create the conditions in which they can grow. Many years ago researchers discovered that solid tumors attract blood vessels to ensure their supply of nutrients by secreting specific factors. Now the immunologist Dr. Uta Hpken (Tumor and Immunogenetics Research Group at the Max Delbrck Center for Molecular Medicine, MDC, Berlin-Buch in the Helmholtz Association) and the hematologist Dr. Armin Rehm (Charit Virchow-Klinikum, Department of Hematology, Oncology and Tumor Immunology, MDC) have shown for the first time that specific forms of lymphoma also create their own survival niche (Blood, doi:10.1182/blood-2010-11-321265)*.

Lymphoma is the term used to describe a group of cancers of the lymphatic system. Lymphoma cells are abnormal immune cells (B cells or T cells), a specific group of white blood cells (lymphocytes). Using a mouse model, Dr. Rehm and Dr. Hpken demonstrated for the first time that the dissemination of lymphoma cells and their accumulation in the lymph nodes or spleen is dependent on specific signaling or growth substances, the chemokines CCL19 or CCL21.

Chemokines normally attract immune cells to a site of infection or inflammation. As former immune cells, lymphoma cells have special antennas (receptors) on their cell surface to which these signaling substances bind. If the lymphoma cells receive the signal via their CCR7 receptor, they migrate into the lymph nodes and into specific areas within the spleen.

Paradox

CCR7 not only mediates the migration of the lymphoma cells, it is also apparently crucial for their development and survival. As the two researchers showed in a next step, the lymphoma cells proliferate in the lymph nodes or in the spleen very slowly if this receptor is absent.

However, with the aid of CCR7 the cancer cells find their survival niche in the T-cell zones of the lymph nodes and the spleen. In these zones T cells are usually made fit for defense. "It is paradoxical that lymphoma cells as former B cells find an absolutely optimal microenvironment for their growth in these T-cell zones," Dr. Hpken said.

There the lymphoma cells crosstalk with stromal cells (connective tissue cells), which subsequently secrete increased quantities of the chemokines CCL19/CCL21. The CCR7 receptor not only mediates the homing of additional lymphoma cells to the lymph nodes or spleen, but also stimulates their proliferation.

On the other hand, the lymphoma cells themselves secrete a signaling substance (lymphotoxin) which induces the stromal cells to secrete more and more chemokines. In this way the lymphoma cells ensure their survival. This may also explain why some lymphomas are so aggressive.

In mice the researchers succeeded in breaking this vicious cycle. Using an active substance that blocks the binding of the lymphotoxins to the stromal cells, they were able to stop tumor growth. "In the future," Dr. Rehm said, "it may be that therapeutic strategies will not target the lymphoma cells directly, but rather the connective tissue so vital for their survival."


'/>"/>

Contact: Barbara Bachtler
bachtler@mdc-berlin.de
49-309-406-3896
Helmholtz Association of German Research Centres
Source:Eurekalert

Related medicine news :

1. Paxil Blocks Tamoxifen, Lowers Survival Odds Against Breast Cancer
2. Certain genetic profiles associated with recurrence-free survival for non-small cell lung cancer
3. Survival benefit with high-intensity end-of-life approaches
4. Aspirin May Boost Breast Cancer Survival
5. Research validates surgery alone offers reasonable overall survival for stage I SCLC
6. News brief: ALDH associated with worse overall survival in patients with pancreatic adenocarcinoma
7. Drug Improved Survival in Mice With Cystic Fibrosis
8. Combined drug therapy to treat TB and HIV significantly improves survival
9. Pre-Diagnosis Diet Linked to Ovarian Cancer Survival
10. Poniard Pharmaceuticals Presents Positive Survival Data from a Phase 2 Clinical Study of Picoplatin in Metastatic Prostate Cancer at the 2010 American Society of Clinical Oncology Genitourinary Cancers Symposium
11. Recent Earthquakes Across the World Underscore the Importance of Emergency Preparedness Supplies and Survival Kits for Individuals, Families and Businesses
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/26/2017)... ... April 26, 2017 , ... The National Business Research ... National Registry of Emergency Medical Technicians and welcomes this organization to the ... Jan G. West, Ph.D. , CEO & Organizational Psychologist at NBRI. “This award ...
(Date:4/26/2017)... ... April 26, 2017 , ... RawTrition now brings you BioEnergy which ... nutrients from SUPERFOODS! , RawTrition is taking nutrients to the next level! ... the body recognizes its raw form (unlike the synthetically made options that are on ...
(Date:4/26/2017)... Doylestown, Pa. (PRWEB) , ... ... ... Solutions division, which provides an agile ecosystem and domain expertise for sponsors ... end-to-end, configurable randomization and trial supply management (RTSM) software platform. Bioclinica ...
(Date:4/25/2017)... ... April 25, 2017 , ... Splashtop ... Mirroring360 Pro . This new addition to the Mirroring360 product family combines device ... business. , Mirroring360 Pro enables educators, business professionals and individuals to stream or ...
(Date:4/25/2017)... ... April 25, 2017 , ... A stressful work environment can hurt the ... overall productivity and performance in the workplace. The goal of Clearview Resolution Services has ... weeks of April, Clearview Resolution Services will be shutting down the office early on ...
Breaking Medicine News(10 mins):
(Date:4/18/2017)... April 18, 2017  Cardinal Health (NYSE: ... fiscal 2017 earnings per share (EPS) guidance and providing ... is in conjunction with this morning,s announcement of the ... and Nutritional Insufficiency businesses. Cardinal Health now ... will be at the bottom of its previous guidance ...
(Date:4/18/2017)... 18, 2017 Viverae ® , a leader ... integration of IBM ® Watson Campaign Automation, implementing ... communications for a personalized experience. Through digital engagement, the ... health in real time. The enhanced experience drives engagement ... members, wherever they are in their journey to health. ...
(Date:4/18/2017)... , April 18, 2017  Astute Medical, Inc., developer ... series to be presented at the 2017 National Kidney ... today and continues through April 22. Physicians will present ... used to assess risk for acute kidney injury (AKI) ... failure (ADHF). Elevated levels of TIMP-2 ...
Breaking Medicine Technology: