Does stress speed up the onset of skin cancer? The answer, in mice anyway, appears to be "yes." Scientists at the Johns Hopkins Kimmel Cancer Center say that chronic stress may speed up the process in those at high-risk for the disease. Their new study, published in the December issue of the Journal of the American Academy of Dermatology, shows that mice exposed to stressful conditions and cancer-causing UV light develop skin cancers in less than half the time it took for non-stressed mice to grow tumors.
The Hopkins investigators say that if what they are seeing in mice has relevance in man, stress-reducing programs like yoga and meditation may help those at high risk for skin cancer stay healthy longer. "Theres a lot of evidence pointing to the negative effects of chronic stress, which dampens our immune system and impacts various aspects of our health," says Francisco Tausk, M.D., associate professor of dermatology at Johns Hopkins and director of the study. "But, to help create solid treatment strategies, we need a better understanding of the mechanisms of how stressors affect skin cancer development."
Tausk exposed 40 mice to the scent of fox urine - the mouse equivalent of big-time stress - and large amounts of UV light. The first skin tumor in one of the mice appeared after eight weeks of testing. Mice exposed only to UV light began developing tumors 13 weeks later. By 21 weeks of testing, 14 of the 40 stressed mice had at least one tumor, and two non-stressed mice had tumors. Most tumors were squamous cell skin cancers, also known as non-melanoma cancers, but which have the potential to spread to other parts of the body.
The personality factor: How to foster the sharing of research data
06.09.2017 | ZBW – Leibniz-Informationszentrum Wirtschaft
Europe’s Demographic Future. Where the Regions Are Heading after a Decade of Crises
10.08.2017 | Berlin-Institut für Bevölkerung und Entwicklung
Plants and algae use the enzyme Rubisco to fix carbon dioxide, removing it from the atmosphere and converting it into biomass. Algae have figured out a way to increase the efficiency of carbon fixation. They gather most of their Rubisco into a ball-shaped microcompartment called the pyrenoid, which they flood with a high local concentration of carbon dioxide. A team of scientists at Princeton University, the Carnegie Institution for Science, Stanford University and the Max Plank Institute of Biochemistry have unravelled the mysteries of how the pyrenoid is assembled. These insights can help to engineer crops that remove more carbon dioxide from the atmosphere while producing more food.
A warming planet
Our brains house extremely complex neuronal circuits, whose detailed structures are still largely unknown. This is especially true for the so-called cerebral cortex of mammals, where among other things vision, thoughts or spatial orientation are being computed. Here the rules by which nerve cells are connected to each other are only partly understood. A team of scientists around Moritz Helmstaedter at the Frankfiurt Max Planck Institute for Brain Research and Helene Schmidt (Humboldt University in Berlin) have now discovered a surprisingly precise nerve cell connectivity pattern in the part of the cerebral cortex that is responsible for orienting the individual animal or human in space.
The researchers report online in Nature (Schmidt et al., 2017. Axonal synapse sorting in medial entorhinal cortex, DOI: 10.1038/nature24005) that synapses in...
Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...
Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!
When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...
For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.
Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...
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22.09.2017 | Life Sciences
22.09.2017 | Medical Engineering
22.09.2017 | Physics and Astronomy