Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

How extreme environmental conditions affect the human brain

05.12.2019

Members of a polar research expedition have provided researchers from Charité – Universitätsmedizin Berlin and the Max Planck Institute for Human Development with an opportunity to study the effects of social isolation and extreme environmental conditions on the human brain. The researchers found changes to the dentate gyrus, an area of the hippocampus responsible for spatial thinking and memory. Results from their study have been published in The New England Journal of Medicine.

Setting off on an Antarctic expedition to Neumayer-Station III, a German Antarctic research station run by the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI), means having to face temperatures as low as -50 degrees Celsius (-58 degrees Fahrenheit) and almost complete darkness during the winter months.


Antarctic Neumayer-Station III

Stahn/Charité

Life at the research station offers little in the way of privacy or personal space. Contact with the outside world is minimal, and cutting one’s stay short is not an option – at least not during the long winter months. Emergency evacuation and deliveries of food and equipment are only possible during the relatively short summer. “This scenario offers us the opportunity to study the ways in which exposure to extreme conditions affect the human brain,” says study lead Dr. Alexander Stahn of Charité’s Institute of Physiology and Assistant Professor at the Perelman School of Medicine at the University of Pennsylvania.

Working alongside Prof. Dr. Simone Kühn (Group Leader of the Lise Meitner Group for Environmental Neuroscience at the Max Planck Institute for Human Development), and supported by the AWI, Alexander Stahn set out to determine whether or not an Antarctic expedition produces changes to the structure and function of the human brain.

Five men and four women volunteered to participate in the study. They spent a total of 14 months at the Antarctic research station, 9 of which were spent in isolation from the outside world. Before, during and after their mission, the participants completed a set of computer-based cognitive tests. These included evaluations of concentration, memory, cognitive reaction time and spatial thinking. Regular blood tests were carried out to measure levels of a specific growth factor known as brain-derived neurotrophic factor (BDNF), a protein responsible for promoting the growth of nerve cells and synapses in the brain. The researchers used magnetic resonance imaging to determine brain structure in each of the participants before and after their mission. They did so in order to record changes in brain volume, paying particular attention to the hippocampus, a structure located deep inside the brain. “For this, we used a high-resolution methodology which makes it possible to take precise measurements of individual areas of the hippocampus,” says Prof. Kühn. A group of nine control participants underwent identical tests.

Measurements taken after the end of the exhibition revealed that the dentate gyrus, an area of the hippocampus with an important role in spatial thinking and memory formation, was smaller in members of the expedition team than in controls. These changes were also associated with a decrease in BDNF levels. After only three months in the Antarctic, levels of the growth factor had decreased to levels below those recorded prior to the start of the expedition and had not returned to normal one-and-a-half months after the expedition. Cognition tests showed effects on both spatial abilities and the so-called selective attention, which is necessary to ignore irrelevant information. Repeated testing is normally associated with improvements in test results. This learning effect, however, was reduced in participants whose dentate gyrus had decreased in volume, the reduction proportional to the extent of the volume lost.

“Given the small number of participants, the results of our study should be viewed with caution,” explains Dr. Stahn, adding: “They do, however, provide important information, namely – and this is supported by initial findings in mice – that extreme environmental conditions can have an adverse effect on the brain and, in particular, the production of new nerve cells in the hippocampal dentate gyrus.” As a next step, the researchers plan to study whether or not physical exercise might be able to counteract the observed changes in the brain.

---

A joint press release by Charité and the Max Planck Institute for Human Development

Charité – Universitätsmedizin Berlin
Charité – Universitätsmedizin Berlin is one of the largest university hospitals in Europe; boasting approximately 100 departments and institutes spread across 4 separate campuses. The hospital offers a total of 3,001 beds and, in 2018, treated 152,693 in- and day case patients in addition to 692,900 outpatients. At Charité, the areas of research, teaching and medical care are closely interlinked. With approximately 18,000 members of staff employed across its group of companies, Charité is one of the largest employers in Berlin. Approximately 4,500 of its employees work in the field of nursing, with a further 4,300 working in research and medical care. In 2018, Charité recorded a turnover of more than €1.8 billion, and set a new record by securing more than €170.9 million in external funding. Charité’s Medical Faculty is one of the largest in Germany, educating and training more than 7,500 medical and dentistry students. Charité also offers 619 training positions across 9 different health care professions.
http://www.charite.de

Max Planck Institute for Human Development
The Max Planck Institute for Human Development in Berlin was founded in 1963. It is an interdisciplinary research institution dedicated to the study of human development and education. The Institute belongs to the Max Planck Society for the Advancement of Science, one of the leading organizations for basic research in Europe. https://www.mpib-berlin.mpg.de

Originalpublikation:

Stahn, A. C., Gunga, H.-C., Kohlberg, E., Gallinat, J., Dinges, D. F., & Kühn, S. (2019). Brain changes in response to long-duration Antarctic expeditions. The New England Journal of Medicine, 381, 2273-2275. doi:10.1056/NEJMc1904905

Weitere Informationen:

https://www.mpib-berlin.mpg.de/en/media/2019/12/how-extreme-environmental-condit...

Nicole Siller | Max-Planck-Institut für Bildungsforschung

More articles from Health and Medicine:

nachricht Novel communication between intestinal microbes and developing immune cells in the thymus
24.01.2020 | Massachusetts General Hospital

nachricht Preventing metastasis by stopping cancer cells from making fat
23.01.2020 | Université catholique de Louvain

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Integrate Micro Chips for electronic Skin

Researchers from Dresden and Osaka present the first fully integrated flexible electronics made of magnetic sensors and organic circuits which opens the path towards the development of electronic skin.

Human skin is a fascinating and multifunctional organ with unique properties originating from its flexible and compliant nature. It allows for interfacing with...

Im Focus: Dresden researchers discover resistance mechanism in aggressive cancer

Protease blocks guardian function against uncontrolled cell division

Researchers of the Carl Gustav Carus University Hospital Dresden at the National Center for Tumor Diseases Dresden (NCT/UCC), together with an international...

Im Focus: New roles found for Huntington's disease protein

Crucial role in synapse formation could be new avenue toward treatment

A Duke University research team has identified a new function of a gene called huntingtin, a mutation of which underlies the progressive neurodegenerative...

Im Focus: A new look at 'strange metals'

For years, a new synthesis method has been developed at TU Wien (Vienna) to unlock the secrets of "strange metals". Now a breakthrough has been achieved. The results have been published in "Science".

Superconductors allow electrical current to flow without any resistance - but only below a certain critical temperature. Many materials have to be cooled down...

Im Focus: Programmable nests for cells

KIT researchers develop novel composites of DNA, silica particles, and carbon nanotubes -- Properties can be tailored to various applications

Using DNA, smallest silica particles, and carbon nanotubes, researchers of Karlsruhe Institute of Technology (KIT) developed novel programmable materials....

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

11th Advanced Battery Power Conference, March 24-25, 2020 in Münster/Germany

16.01.2020 | Event News

Laser Colloquium Hydrogen LKH2: fast and reliable fuel cell manufacturing

15.01.2020 | Event News

„Advanced Battery Power“- Conference, Contributions are welcome!

07.01.2020 | Event News

 
Latest News

Researchers discover vaccine to strengthen the immune system of plants

24.01.2020 | Life Sciences

Brain-cell helpers powered by norepinephrine during fear-memory formation

24.01.2020 | Life Sciences

Engineered capillaries model traffic in tiny blood vessels

24.01.2020 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>