While drugs such as tamoxifen have been a huge success in treating breast cancer, for a significant proportion of sufferers the drugs either fail to work, or after an initial successful response the patient relapses as the cancer acquires or possesses resistance to the drug.
However the researchers have discovered that inhibiting the activity of a certain protein in the cancer could prevent or even reverse the resistance to tamoxifen. The researchers noticed that when breast cancer cells grown in the laboratory develop resistance to tamoxifen, they show a large increase in the activity of a protein known as Src – and by stopping this activity resistance to tamoxifen can be prevented and even reversed.
Dr Stephen Hiscox of the Welsh School of Pharmacy, who led the research team and has just been appointed as one of the Cancer Research UK Cardiff University Research Fellows explained: “We have previously shown that when breast cancer cells become resistant to medicines such as tamoxifen in the laboratory they become more aggressive with an invasive behaviour. These are characteristics that can be promoted by Src, a protein which we have recently shown to be more active in tamoxifen-resistant than tamoxifen-sensitive breast cancer cells.
“As part of collaborative research between Tenovus and AstraZeneca, it was found that this aggressive, invasive behaviour could be reduced by treating the cells with a specific inhibitor of Src activity, AZD0530. Surprisingly, AZD0530 also made the tamoxifen-resistant cells sensitive to tamoxifen again. In addition, we found that co-treating the cells with a combination of tamoxifen and AZD0530 could actually prevent drug resistance occurring in the first place.”
The Src inhibitor AZD0530 developed by AstraZeneca is currently in early clinical trials. If the results seen in the laboratory can be reproduced in the clinic, this approach could offer a substantial clinical benefit to a large number of women with breast cancer, as Professor Robert Nicholson, Director of the Tenovus Centre for Cancer Research, explains:
“Whilst little is known about the mechanisms used by breast cancers to become resistant to common therapies such as tamoxifen, it remains a significant clinical problem. Therefore the ability to restore sensitivity to therapy, or to even prevent resistance arising in the first place, could be of huge benefit to a large number of breast cancer patients.”
Lowri Jones | EurekAlert!
UIC researchers find unique organ-specific signature profiles for blood vessel cells
18.02.2020 | University of Illinois at Chicago
Remdesivir prevents MERS coronavirus disease in monkeys
14.02.2020 | NIH/National Institute of Allergy and Infectious Diseases
The operational speed of semiconductors in various electronic and optoelectronic devices is limited to several gigahertz (a billion oscillations per second). This constrains the upper limit of the operational speed of computing. Now researchers from the Max Planck Institute for the Structure and Dynamics of Matter in Hamburg, Germany, and the Indian Institute of Technology in Bombay have explained how these processes can be sped up through the use of light waves and defected solid materials.
Light waves perform several hundred trillion oscillations per second. Hence, it is natural to envision employing light oscillations to drive the electronic...
Most natural and artificial surfaces are rough: metals and even glasses that appear smooth to the naked eye can look like jagged mountain ranges under the microscope. There is currently no uniform theory about the origin of this roughness despite it being observed on all scales, from the atomic to the tectonic. Scientists suspect that the rough surface is formed by irreversible plastic deformation that occurs in many processes of mechanical machining of components such as milling.
Prof. Dr. Lars Pastewka from the Simulation group at the Department of Microsystems Engineering at the University of Freiburg and his team have simulated such...
Investigation of the temperature dependence of the skyrmion Hall effect reveals further insights into possible new data storage devices
The joint research project of Johannes Gutenberg University Mainz (JGU) and the Massachusetts Institute of Technology (MIT) that had previously demonstrated...
Researchers at Chalmers University of Technology, Sweden, recently completed a 5-year research project looking at how to make fibre optic communications systems more energy efficient. Among their proposals are smart, error-correcting data chip circuits, which they refined to be 10 times less energy consumptive. The project has yielded several scientific articles, in publications including Nature Communications.
Streaming films and music, scrolling through social media, and using cloud-based storage services are everyday activities now.
After helping develop a new approach for organic synthesis -- carbon-hydrogen functionalization -- scientists at Emory University are now showing how this approach may apply to drug discovery. Nature Catalysis published their most recent work -- a streamlined process for making a three-dimensional scaffold of keen interest to the pharmaceutical industry.
"Our tools open up whole new chemical space for potential drug targets," says Huw Davies, Emory professor of organic chemistry and senior author of the paper.
12.02.2020 | Event News
16.01.2020 | Event News
15.01.2020 | Event News
19.02.2020 | Life Sciences
19.02.2020 | Information Technology
19.02.2020 | Power and Electrical Engineering