Read more at: Human Health
In the focus of the protons
At the PSI, researchers work with radioactivity every day in order to develop advanced treatment methods for patients. Naturally, they take special safety precautions working with a material that decays. It's a race against time. To make sure everything functions smoothly, a dedicated work group takes care of the infrastructure.
Back to life
Doctors had discovered, behind Gabi Meier’s right eye, a tumour that surrounded the optic nerve. Only at the PSI was there still one possibility to treat the tumour in such a way as to preserve neighbouring structures and the eye. A few months after the proton treatment was over, I realised that I could see more and more, she said in an interview. “Just dimly, it’s true, but I could see! That was sensational!”
20 years of high-precision combat against cancer
On 25.11.1996, at the Paul Scherrer Institute PSI, the world’s first cancer patient was treated with a new irradiation method: the so-called spot-scanning technique for proton beams. What’s special about it: The beam has its effect only at the depth where the tumour is located; healthy tissue above and below it is preserved. The method, developed by PSI researchers, was a breakthrough at the time and quickly became a successful product.
Catching proteins in the act
Proteins are indispensable building blocks of life. They play a vital role in many biological processes. Researchers have now been able to show how the ultrafast processes by which proteins do their work can be studied with free-electron X-ray lasers such as SwissFEL at the Paul Scherrer Institute PSI. Free-electron X-ray lasers generate extremely short and intense pulses of X-ray light. Currently there are just two such facilities in operation, worldwide. The results were published in the scientific journal Nature Communications.
Designer nuclide for medical applications
Researchers at the PSI have for the first time used a cyclotron to produce the radionuclide scandium-44 in a quantity and concentration as needed for medical treatment. With that, they have achieved the first precondition for scandium-44 to be used one day for medical tests in hospitals.
To starve a tumour
PSI researcher Kurt Ballmer-Hofer is concerned with the question of how tumours could be starved by preventing the development of blood vessels. After 40 years of research that yielded many fundamental insights about the formation of blood vessels, one of the key molecules has been found; further research is expected to enable clinical applications.
Experiment in a hovering droplet
At the PSI, the exact structure of proteins is deciphered in the standard way, with X-rays. Now two PSI researchers have used a clever trick to advance this method further: Instead of pinning down the proteins, they are studying them within a levitating drop of liquid.
Hitting cancer from the inside
Researchers at the Paul Scherrer Institute PSI are now investigating a new method to channel radioactive substances directly into the nucleus of a cancer cell. Through this approach, the radiation source remains inside the cell and works in a more targeted way, because it gets closer to the cell's genetic information.
Medicines made to order with pinpoint precision
At PSI, scientists are developing new medicines against cancer. These contain radioactive substances that can be injected into the patients and thus make their way to the tumour. There, in direct contact, their radiation should destroy the cancer cells. Before such a radioactive medicine can be tested on patients in the first clinical trials, however, its safety must be guaranteed to ensure that the patient will not be harmed. Therefore every agent is produced at the PSI under sterile conditions and tested – separately for each patient, and only on the doctor's order.
Developing a new drug against thyroid cancer
Researchers at the Paul Scherrer Institute PSI have developed a drug to trace and treat a particularly malignant strain of thyroid cancer more effectively. One advantage of the new drug is that it can be used to treat a strain of thyroid cancer where the established treatment is ineffective. The researchers at PSI have developed the new drug to such an extent that an initial study conducted on cancer patients at the University Hospital Basel can now get underway.
Probing what sets the heart racing
New insights into the workings of important drug receptorsMany medical drugs operate on specific receptors located in the outer walls of our body’s cells. One of these is called the beta-1 adrenergic receptor. Among other things, it is responsible for palpitation, the racing pulse that we feel with stage fright or infatuation. How it transmits signals to the cellular interior can now be revealed in detail. These findings could help scientists better understand many drugs' mode of action.
There are tumours where nothing seems to help: not chemotherapy, not external radiation therapy, not an operation. Often, they have already metastasised and can no longer be destroyed using conventional methods. The only option left here is internal radiotherapy with targeted radioactive drugs that strike directly at the heart of the disease. In order to make this possible, twenty specialists have been conducting research at the Centre for Radiopharmaceutical Sciences at the Paul Scherrer Institute PSI, a joint facility of PSI, ETH Zurich and the University Hospital Zurich.
3D nanostructure of a bone made visible
Bones are made up of tiny fibres that are roughly a thousand times finer than a human hair. Researchers at the Paul Scherrer Institute PSI have developed a new computer-based algorithm with which they were able to visualize the localised order and alignment of these nanostructures inside an entire piece of bone for the first time.
Robust X-ray machine for developing countries
The Paul Scherrer Institute PSI is involved in a project conducted by several research institutes (spearheaded by EPFL) to devise an X-ray machine especially for developing countries. The device should be able to cope with tropical climes and be easy and cheap to repair. PSI researchers are focusing on producing a cost-effective detector that is necessary for the imaging. The detector registers the X-ray light much like a chip in a digital camera.
New details of the transmission of stimuli in living organisms unveiled
Researchers unveil new details of how cells in a living organism process stimuli. So-called G-proteins, which help conduct external stimuli that reach a cell into its interior, play a central role here. For the first time, the study shows which parts of the G-proteins are vital for their function. Researchers from the Paul Scherrer Institute PSI, ETH Zurich, the pharmaceutical company Roche and the British MRC Laboratory of Molecular Biology report their results in the journals Nature and Nature Structural and Molecular Biology.
Fighting tumours with protons
Interview with Damien Charles WeberDamien Charles Weber has been the head and chief physician of the Centre for Proton Therapy, the only centre of its kind in Switzerland, since 2013. In this interview, he talks about the successes of proton therapy in cancer treatment and the objectives for the next few years in this field.
Together, not alone
Decoding biomolecules at SwissFEL and SLSProteins are a coveted but stubborn research object. A method developed for x-ray free-electron lasers and PSI’s future SwissFEL should now help researchers to make good headway in this field. It involves x-raying many small, identical protein samples consecutively at short intervals, thereby avoiding the main problem that protein research has faced thus far: producing samples in a sufficient size.
Phase contrast improves mammography
Phase contrast X-ray imaging has enabled researchers at ETH Zurich, the Paul Scherrer Institute (PSI) and the Kantonsspital Baden to perform mammographic imaging that allows greater precision in the assessment of breast cancer and its precursors. The technique could improve biopsy diagnostics and follow-up.
An infection tool with a metallic core
Thanks to the analysis of protein samples at the PSI, Lausanne researchers have managed to demonstrate which instrument bacteria use to transmit diseasesResearchers from ETH Lausanne EPFL have described how a particular strain of bacteria transmits diseases with unprecedented precision. The team of scientists headed by Petr Leiman, an assistant professor at the EPFL’s Laboratory of Structural Biology and Biophysics, demonstrated that the tip of a bacterial infection tool consists of a PAAR protein, which envelops a metal atom and tapers off to a sharp point. The findings are based on measurements carried out at the Swiss Light Source (SLS), one of the three large research facilities at the Paul Scherrer Institute (PSI).
How botox binds to neurons
Botox is a highly dangerous toxin that causes paralysis. In cosmetic applications it is used to temporarily eliminate wrinkles and in medicine as a treatment for migraine or to correct strabismus. An international research team has now established how the toxin molecule binds to the neuron whose activity is then blocked by the poison. The findings may be useful for the development of improved drugs with a lower risk of overdosage.