Navigation Links
No relaxing for cancer cells
Date:6/1/2010

Many tumor cells would not be viable due to aberrant chromosome distribution if they had not developed a special trick. Scientists from the German Cancer Research Center have investigated which genes are responsible for this survival strategy of cancer cells. The revealed that cancer cells rely on the tension of specific protein fibers to be able to multiply. Thus, proteins which maintain this tension are promising targets for new, target-specific anticancer drugs: If they are switched off, cancer cells die.

The two centrosomes of a cell are responsible for cell division to proceed correctly. From these polar bodies in the cytoplasm protein fibers form which correctly distribute the duplicated chromosome set to the newly forming daughter cells. Seen under the microscope, these fibers have the shape of a spindle. Cancer cells, however, often have more than two centrosomes. As a result, their spindle fibers do not necessarily assume the normal shape of a spindle with two poles; instead, they can have a dysfunctional, multipolar shape. Such malformed spindles distribute the chromosomes unevenly among the daughter cells, which are then no longer viable.

Hence, tumor cells only survive if they manage to partition their chromosomes correctly in spite of extra centrosomes. To do so, many cancer cells have developed a special trick: They form clusters of centrosomes. Two clusters are formed per cell and a functioning bipolar spindle can develop between these two. Professor Dr. Alwin Krmer, head of a Clinical Cooperation Unit of DKFZ and Heidelberg University Hospitals has recognized this trick as a previously underrated Achilles' heel of cancer cells, which might be used for destroying them. Jointly with colleagues from DKFZ, Heidelberg University Hospitals, Mannheim Medical Faculty and Mayo Clinic in the U.S., he systematically investigated the question of which genes enable cancer cells to form centrosome clusters and, thus, to escape cell death.

With the support of researchers from the division of Professor Dr. Michael Boutros, DKFZ and Mannheim Medical Faculty, the investigators switched off each individual gene of the cancer cells. Then they searched under the microscope for multipolar, malformed spindles. They found 82 genes which play a role in centrosome clustering. The team took a closer look at 22 of these and investigated their particular role in clustering. In the process, the scientists discovered a key mechanism: For the centrosomes to be bundled into clusters, the spindle fibers need to be under tension. Only tightly stretched spindle fibers will position the centrosomes close enough to each other for clusters to form. A whole range of proteins are responsible for this tension. If their genes are silenced, multipolar spindles form and the cancer cells die. This mechanism might be used for developing new cancer therapies.

"Such a therapy would hit the cancer very specifically, because only tumor cells have extra centrosomes and depend on the survival trick of clustering," study head Alwin Krmer explains. In the framework of a strategic alliance of DKFZ with Bayer-Schering, the researchers in Krmer's team are now planning to look among the identified genes for suitable targets for a targeted cancer therapy.


'/>"/>

Contact: Dr. Sibylle Kohlstaedt
s.kohlstaedt@dkfz.de
Helmholtz Association of German Research Centres
Source:Eurekalert

Related biology news :

1. Green tea boosts production of detox enzymes, rendering cancerous chemicals harmless
2. A study by the MUHC and McGill University opens a new door to understanding cancer
3. ESF EURYI award winner aims to stop cancer cells reading their own DNA
4. Protein chatter linked to cancer activation
5. Newly created cancer stem cells could aid breast cancer research
6. Western diet linked to increased risk of colon cancer recurrence
7. Obesity and lack of exercise could enhance the risk of pancreatic cancer
8. Low levels of key protein may indicate pancreatic cancer risk
9. Birth records hold pancreatic cancer clue
10. Many parents at-risk for cancer disclose genetic test results to children
11. A new radiation therapy treatment developed for head and neck cancer patients
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/8/2017)... Feb. 7, 2017 The biometrics market ... the confluence of organizations, desires to better authenticate ... systems (password and challenge questions), biometrics is quickly ... systems. The market is driven by use cases, ... consumer and enterprise uses cases, with consumer-facing use ...
(Date:2/6/2017)... DENVER , Feb. 6, 2017 ... national security are driving border authorities to continue ... Acuity reports there are 2143 Automated Border Control ... Kiosks currently deployed at more than 163 ports ... between 2013 to 2016 achieving a combined CAGR ...
(Date:2/2/2017)... , Feb. 1, 2017  Central to ... and meaningful advances worldwide, The Japan Prize Foundation ... Prize, who have pushed the envelope in their ... and Communication. Three scientists are being recognized with ... achievements that not only contribute to the advancement ...
Breaking Biology News(10 mins):
(Date:2/20/2017)... ... February 20, 2017 , ... Global relationship marketing company ... for full, active membership in the Canadian Direct Sellers Association (DSA) effective immediately. ... Officer Jeff Olson in 2011. Today Nerium International, with its cutting ...
(Date:2/20/2017)... 2017 This report analyzes the worldwide markets for ... Xylanase, Amylase, Cellulase, and Others. The report provides separate comprehensive ... Japan , Europe , ... and Rest of World. Read the full ... are provided for the period 2015 through 2022. Also, a ...
(Date:2/20/2017)... (PRWEB) , ... February 20, ... ... leading US Joint Commission Accredited venture-backed teleradiology and telemedicine company announces at ... Healthineers. USARAD services are planned to be offered via a global cloud-based ...
(Date:2/20/2017)... , Feb. 20, 2017  Former NFL players who ... motor functions later in life, according to a preliminary study ... of Neurology,s 69th Annual Meeting in Boston ... functions are complex movements where the muscles and nerves work ... ...
Breaking Biology Technology: