This release is available in German.
Feelings of anxiety very effectively prevent people from getting into situations that are too dangerous. Those who have had a terrible experience initially tend to avoid the place of tragedy out of fear. If no other oppressive situation arises, normally the symptoms of fear gradually subside. "The memory of the terrible events is not just erased." states first author, PD Dr. Andras Bilkei Gorzo, from the Institute for Molecular Psychiatry at the University of Bonn. "Those impacted learn rather via an active learning process that they no longer need to be afraid because the danger has passed." But following extreme psychical stress resulting from wars, hostage-takings, accidents or catastrophes chronic anxiety disorders can develop which even after months don't subside.
Body's own dynorphin weakens fears
Why is it that in some people terrible events are deeply engraved in their memory, while after a while others seem to have completely put aside any anxiety related to the incident? Scientists in the fields of psychiatry, molecular psychiatry and radiology at the University of Bonn are all involved in probing this issue. "We were able to demonstrate by way of a series of experiments that dynorphin plays an important role in weakening anxiety," says Prof. Dr. Andreas Zimmer, Director of the Institute for Molecular Psychiatry at the University of Bonn. The substance group in question is opiods which also includes, for instance, endorphins. The latter are released by the body of athletes and have an analgesic and euphoric effect. The reverse, however, is true of dynorphins: They are known for putting a damper on emotional moods.
Mice with disabled gene exhibit persistent anxiety
The team working with Prof. Zimmer tested the exact impact of dynorphins on the brain using mice
|Contact: Dr. Andras Bilkei Gorzo|
University of Bonn