Stressed individuals might be particularly prone to binge eating or drug addiction because of the high levels of the stress hormone corticotropin-releasing factor in their brain. A study published today in the open access journal BMC Biology (http://www.biomedcentral.com/bmcbiol/) shows that rats with levels of corticotropin-releasing factor (CRF) in their brain similar to the levels experienced by humans when they are stressed show an exaggerated craving for a reward – a piece of sugar - whenever presented with a cue that had previously been associated with that reward. This result explains why stressed individuals might be more likely to experience strong cravings for rewards and compulsively indulge in pleasurable activities such as eating or taking drugs.
Susana Peciña and Kent Berridge from the University of Michigan in Ann Arbor and Jay Schulkin from Georgetown University, Washington DC, USA, injected rats with either a high dose (500ng/0.2 ml) or a low dose (250ng/ 0.2 ml) of CRF. They injected the rats in a part of the brain called nucleus accumbens, known to be involved in the mediation of both pleasurable rewards and stress signals in humans as well as rats. They observed the behaviour of the rats in response to a cue – a 30-second long tone- that had previously been associated with the release of a reward, in the form of sugar pellets. When they heard the cue, the rats pressed on a lever that they expected to release more sugar pellets. The authors made sure that the rats did not experience stress as a result of CRF itself or of other factors in the experimental set-up.
Peciña et al.’s results show that injection of a high dose of CRF tripled the intensity of bursts of sugar craving, as indicated by the intensity of the lever-pressing activity lever. The lever-pressing activity was only enhanced if the injection of CRF was followed by the cue – it did not increase following the injection alone. The low dose of CRF, or an empty injection, also failed to enhance the lever-pressing activity significantly.
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24.05.2018 | Arizona State University
3D images of cancer cells in the body: Medical physicists from Halle present new method
16.05.2018 | Martin-Luther-Universität Halle-Wittenberg
The more electronics steer, accelerate and brake cars, the more important it is to protect them against cyber-attacks. That is why 15 partners from industry and academia will work together over the next three years on new approaches to IT security in self-driving cars. The joint project goes by the name Security For Connected, Autonomous Cars (SecForCARs) and has funding of €7.2 million from the German Federal Ministry of Education and Research. Infineon is leading the project.
Vehicles already offer diverse communication interfaces and more and more automated functions, such as distance and lane-keeping assist systems. At the same...
A research team led by physicists at the Technical University of Munich (TUM) has developed molecular nanoswitches that can be toggled between two structurally different states using an applied voltage. They can serve as the basis for a pioneering class of devices that could replace silicon-based components with organic molecules.
The development of new electronic technologies drives the incessant reduction of functional component sizes. In the context of an international collaborative...
At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.
At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...
There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?
At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...
So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics
Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...
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