The laboratory and animal study suggests that the substance interleukin 21 (IL-21) might improve the effectiveness of the drug Herceptin. The findings suggest that this happens because the IL-21 boosts the cancer-killing activity of immune cells called natural killer (NK) cells, which attack the tumor.
The findings by researchers at the Ohio State University Comprehensive Cancer Center – Arthur G. James Cancer Hospital and Richard J. Solove Research Institute are published in the July 1 issue of The Journal of Immunology. The researchers hope to begin a clinical trial to test the strategy in humans soon.
Herceptin is used to treat HER2-positive breast cancer -- about 20 percent of all breast-cancer cases. HER2 breast cancers have a protein called HER2 on the surface of the tumor cells. Herceptin attaches to the HER2 protein and coats the cells.
The findings indicate that IL-21 stimulates NK cells to attack and destroy the Herceptin-coated cells.
“Only 25 to 35 percent of patients with this form of breast cancer respond to Herceptin,” says principal investigator William E. Carson, III, associate professor of surgery and associate director for clinical research at the OSU Comprehensive Cancer Center .
“Our results suggest that giving IL-21 along with the Herceptin might increase the patient's immune response to the tumor and perhaps boost the drug's effectiveness.”
Many researchers believe that Herceptin works because it stops tumor cells from growing and causes them to self-destruct through a natural process called programmed cell death, explains first author Julie M. Roda, a graduate research associate in Carson 's laboratory.
But, Roda says, “our findings provide new evidence that Herceptin works at least in part by stimulating NK cells activity, and that IL-21 enhances that action.”
Carson, Roda and their collaborators chose to study IL-21 because the substance is known to activate NK cells and causes them to release substances that attract other immune cells to a tumor site.
This study's findings came from several experiments. First, the scientists exposed NK cells in Petri dishes to both Herceptin and IL-21. This caused the cells to release three to 10 times more of a substance called interferon gamma than would cells exposed to either agent alone.
Interferon gamma is an immune-system signaling agent that causes the NK cells to become more active. It also increases the activity of other immune cells and forces tumor cells to self-destruct.
The researchers then repeated this experiment in mice. They found that animals given both IL-21 and Herceptin-coated tumor cells had nearly three times more interferon gamma in their blood than did animals injected with either of those items alone.
Still another experiment used mice with HER2-positive tumors. When the animals were treated with both the mouse version of Herceptin and IL-21, the tumors shrunk by nearly half compared to those in mice receiving either agent alone.
Last, to test whether the interferon gamma was important for causing the tumors to shrink, the researchers repeated this experiment using mice that cannot make the substance.
The researchers were surprised to find that when interferon gamma was missing, the mouse drug and IL-21 combination had no effect on the tumors.
“We thought if we took out interferon gamma, the NK cells would still be able to kill the tumor cells,” Roda says.
But that didn't happen
“This is very interesting because it suggests that interferon gamma production might be critical to the response to Herceptin, and I believe that we are the first to show this.”
Overall, says Carson , “Our results suggest that IL-21 might enhance the effectiveness of Herceptin, and perhaps similar anticancer drugs.”
Funding from the National Cancer Institute supported this research.
Darrell E. Ward | EurekAlert!
How brains surrender to sleep
23.06.2017 | IMP - Forschungsinstitut für Molekulare Pathologie GmbH
A new technique isolates neuronal activity during memory consolidation
22.06.2017 | Spanish National Research Council (CSIC)
An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.
Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...
Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.
Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...
Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.
As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...
Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.
With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...
Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine
Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...
19.06.2017 | Event News
13.06.2017 | Event News
13.06.2017 | Event News
23.06.2017 | Physics and Astronomy
23.06.2017 | Physics and Astronomy
23.06.2017 | Information Technology