Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Oncolytic viruses for targeted attack on cancer stem cells generated

07.01.2013
Scientists at the Paul-Ehrlich-Institut (PEI) have successfully created oncolytic viruses which effectively target CD133-positive cancer stem cells to infect and kill them. In animal experiments, multiple tumour foci could be completely eradicated. Cancer Research reports on the results of this research in its online edition of 4th January (Friday afternoon).
Tumours do not consist of homogenous cell populations but contain cancer stem cells which respond poorly to chemotherapy and radiotherapy and are considered to be responsible for metastatic tumours. Scientists have therefore stepped up their efforts to find ways of identifying and eliminating these "tumour-initiating cells".

The cell surface protein CD133 is currently discussed as a characteristic marker for such cancer stem cells. The PEI President’s Research Group "Molecular Biotechnology and Gene therapy" led by Professor Christian Buchholz has modified an attenuated and thus innocuous measles virus for the targeted attack on cancer stem cells. The modified virus requires the surface protein CD133 as receptor for penetration into the cell. The scientists were able to prove that the modified virus infects only CD133-positive tumor cells even when these are cultivated in close contact with CD133-negative cells.

In collaboration with Heidelberg University and the German Cancer Research Center (Deutsches Krebsforschungszentrum, DKFZ), the Paul-Ehrlich-Institut’s scientists tested the anti-tumoural effect of their targeted virus using mouse models reflecting glioma, colon carcinoma, and liver cancer. The modified virus showed pronounced anti-tumoural activity in all animal models tested – the tumour growth was substantially reduced or even entirely suppressed. The scientists compared the effectiveness of their modified oncolytic measles virus with that of an oncolytic measles virus currently investigated in clinical trials which does not show any specificity for subtypes of tumour cells. "We were surprised that the CD133-specific virus showed an anti-tumoural activity which was at least as good as that of the standard virus. In the liver cancer model, the anti-tumoural activity was clearly superior and led to complete tumour remission", said Professor Buchholz. In further studies, the research team aims at elucidating why their viruses turned out to be more effective in fighting tumours than conventional oncolytic viruses which are supposed to attack all tumour cell subtypes.

Is it really only cancer cells that are attacked by the CD133-specific virus? In fact, not only cancer stem cells bear the surface marker CD133 but also haematopoietic stem cells. Yet, haematopoietic stem cells were not attacked by the oncolytic measles virus. This is due to the innate immunity of these cells, which protects them from an attack by measles virus. Many tumour cell types exhibit a defect in innate immunity allowing the virus to replicate unimpaired.

One advantage of the use of oncolytic viruses in cancer therapy is their enhancer mechanism. Infected tumor cells produce progeny virus particles which are released upon cell lysis and are able to detect further tumour cells.

Dr. Susanne Stöcker | idw
Further information:
http://cancerres.aacrjournals.org/content/early/2013/01/04/0008-5472.CAN-12-2221.abstract
http://www.pei.de/EN/research/groups/presidents-groups/viral-gene-transfer-medicinal-products/pr1-viral-gene-transfer-medicinal-product

More articles from Life Sciences:

nachricht How to become a T follicular helper cell
31.07.2015 | La Jolla Institute for Allergy and Immunology

nachricht Heating and cooling with light leads to ultrafast DNA diagnostics
31.07.2015 | University of California - Berkeley

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Quantum Matter Stuck in Unrest

Using ultracold atoms trapped in light crystals, scientists from the MPQ, LMU, and the Weizmann Institute observe a novel state of matter that never thermalizes.

What happens if one mixes cold and hot water? After some initial dynamics, one is left with lukewarm water—the system has thermalized to a new thermal...

Im Focus: On the crest of the wave: Electronics on a time scale shorter than a cycle of light

Physicists from Regensburg and Marburg, Germany have succeeded in taking a slow-motion movie of speeding electrons in a solid driven by a strong light wave. In the process, they have unraveled a novel quantum phenomenon, which will be reported in the forthcoming edition of Nature.

The advent of ever faster electronics featuring clock rates up to the multiple-gigahertz range has revolutionized our day-to-day life. Researchers and...

Im Focus: Superfast fluorescence sets new speed record

Plasmonic device has speed and efficiency to serve optical computers

Researchers have developed an ultrafast light-emitting device that can flip on and off 90 billion times a second and could form the basis of optical computing.

Im Focus: Unlocking the rice immune system

Joint BioEnergy Institute study identifies bacterial protein that is key to protecting rice against bacterial blight

A bacterial signal that when recognized by rice plants enables the plants to resist a devastating blight disease has been identified by a multi-national team...

Im Focus: Smarter window materials can control light and energy

Researchers in the Cockrell School of Engineering at The University of Texas at Austin are one step closer to delivering smart windows with a new level of energy efficiency, engineering materials that allow windows to reveal light without transferring heat and, conversely, to block light while allowing heat transmission, as described in two new research papers.

By allowing indoor occupants to more precisely control the energy and sunlight passing through a window, the new materials could significantly reduce costs for...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

3rd Euro Bio-inspired - International Conference and Exhibition on Bio-inspired Materials

23.07.2015 | Event News

Clash of Realities – International Conference on the Art, Technology and Theory of Digital Games

10.07.2015 | Event News

World Conference on Regenerative Medicine in Leipzig: Last chance to submit abstracts until 2 July

25.06.2015 | Event News

 
Latest News

Tool making and additive technology exhibition: Fraunhofer IPT at Formnext

31.07.2015 | Trade Fair News

First Siemens-built Thameslink train arrives in London

31.07.2015 | Transportation and Logistics

California 'rain debt' equal to average full year of precipitation

31.07.2015 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>