Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

How Insulin in the Brain May Suppress the Subjective Feeling of Hunger

19.06.2017

Insulin in the brain may help regulate the hunger sensation and improve functional connectivity in certain cognitive brain regions (default-mode network, DMN *) as well as in the hippocampus and hypothalamus. This is the finding of a new study by researchers at the German Center for Diabetes Research (DZD) in Tübingen.

Eating behavior and the subjective feeling of hunger are regulated by a variety of hormones. Here a key role is played by the hormone insulin because it is not only active in the body, but also in the brain. It was previously known that insulin acts on the homeostatic region (hypothalamus**).


Intranasal insulin enhances functional connectivity in specific cognitive brain regions (default-mode network, DMN) as well as in the hippocampus and the hypothalamus.

Image source: IDM

Now, however, scientists have found that the hormone is also active in other brain regions. Researchers at the Institute for Diabetes Research and Metabolic Diseases of Helmholtz Zentrum München at the University of Tübingen, a partner of the DZD, have further deciphered the function of insulin in the brain as well as its influence on the subjective feeling of hunger and have published their findings in Scientific Reports, a Nature research journal.

To better understand the mechanism of action of insulin, the researchers administered insulin intranasally to healthy young adults. Through the application of the hormone via a nasal spray, the blood-brain barrier is bypassed and the insulin reaches the brain directly. In the study, 25 lean, ten overweight and 12 obese participants “sniffed” insulin or the placebo. Brain activity was then visualized and recorded by means of a functional magnetic resonance imaging (fMRI) scan.

The result in all study participants: Intranasal insulin improves functional connectivity in the prefrontal regions of the default-mode network (DMN), a group of brain regions that are activated when a person is at rest and is not performing any tasks. This region is central to cognitive processes. In addition, the functional connectivity between the DMN and the hippocampus as well as the hypothalamus is strengthened.

These changes in the brain also influence eating behavior and alter the relationship between adiposity and the hunger sensation. Actually, people with a lot of visceral adipose tissue*** have an increased sensation of hunger. "Insulin-enhanced connectivity between the DMN and the hippocampus suppresses the relationship between adipose tissue and the subjective hunger feeling," said Stephanie Kullmann, author of the study. The study participants felt less hunger after being administered intranasal insulin.

In addition, the scientists observed that insulin in the brain also improves the effect of the hormone in the body. Study participants with insulin-induced increased functional connectivity in the DMN have higher insulin sensitivity in the body. This counteracts obesity and type 2 diabetes.

The current results show that insulin in the brain – due to increased functional connectivity between cognitive and homeostatic regions – may help regulate eating behavior and facilitate weight loss.

Original Publication:
Stephanie Kullmann, Martin Heni, Ralf Veit, Klaus Scheffler, Jürgen Machann, Hans-Ulrich Häring, Andreas Fritsche, Hubert Preissl. Intranasal insulin enhances brain functional connectivity mediating the relationship between adiposity and subjective feeling of hunger. Scientific Reports | 7: 1627 | DOI:10.1038/s41598-017-01907-w

* The default-mode network DMN is a group of brain regions that is active when a person is daydreaming, making future plans, etc. It enables thinking without having a stimulus.

** The hypothalamus is the supreme regulatory center for all vegetative and endocrine processes. The hypothalamus coordinates water and saline balance as well as blood pressure. It ensures the maintenance of the inner milieu (homeostasis) and regulates food intake.

*** The fatty tissue on and especially in the abdomen is called visceral fat. It is stored in the free abdominal cavity and envelops the internal organs – especially the organs of the digestive system. There is a relationship between visceral adipose tissue and the subjective feeling of hunger.

Scientific Contact:
Dr. Stephanie Kullmann
Institute for Diabetes Research and Metabolic Diseases (IDM)
of Helmholtz Zentrum München at the University of Tübingen
Otfried-Müller-Straße 47
72076 Tübingen
Germany
Phone: +49 (0)7071-2987703
email: stephanie.kullmann@med.uni-tuebingen.de

Media Contact:
Birgit Niesing
German Center for Diabetes Research (DZD
Ingolstädter Landstraße 1
85764 Neuherberg
Germany
Phone: +49 (0)89-3187-3971
email: niesing@dzd-ev.de

The German Center for Diabetes Research (DZD) is one of six German Centers for Health Research. It brings together experts in the field of diabetes research and integrates basic research, epidemiology, and clinical applications. By adopting an innovative, integrative approach to research, the DZD aims to make a substantial contribution to the successful personalized prevention diagnosis and treatment of diabetes mellitus. The members of the DZD are Helmholtz Zentrum München – German Research Center for Environmental Health, the German Diabetes Center (DDZ) in Düsseldorf, the German Institute of Human Nutrition (DIfE) in Potsdam-Rehbrücke, the Institute of Diabetes Research and Metabolic Diseases of Helmholtz Zentrum München at the University of Tübingen, the Paul Langerhans Institute Dresden of Helmholtz Zentrum München at the Carl Gustav Carus University Hospital of TU Dresden, associated partners at the universities in Heidelberg, Cologne, Leipzig, Lübeck and Munich, and other project partners. www.dzd-ev.de 

The Helmholtz Zentrum München, the German Research Center for Environmental Health, pursues the goal of developing personalized medical approaches for the prevention and therapy of major common diseases such as diabetes and lung diseases. To achieve this, it investigates the interaction of genetics, environmental factors and lifestyle. The Helmholtz Zentrum München is headquartered in Neuherberg in the north of Munich and has about 2,300 staff members. It is a member of the Helmholtz Association, a community of 18 scientific-technical and medical-biological research centers with a total of about 37,000 staff members. www.helmholtz-muenchen.de/en

Birgit Niesing | idw - Informationsdienst Wissenschaft

Further reports about: BRAIN Diabetes Insulin adipose tissue brain regions default-mode network hormone

More articles from Life Sciences:

nachricht Zebrafish's near 360 degree UV-vision knocks stripes off Google Street View
22.06.2018 | University of Sussex

nachricht New cellular pathway helps explain how inflammation leads to artery disease
22.06.2018 | Cedars-Sinai Medical Center

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Temperature-controlled fiber-optic light source with liquid core

In a recent publication in the renowned journal Optica, scientists of Leibniz-Institute of Photonic Technology (Leibniz IPHT) in Jena showed that they can accurately control the optical properties of liquid-core fiber lasers and therefore their spectral band width by temperature and pressure tuning.

Already last year, the researchers provided experimental proof of a new dynamic of hybrid solitons– temporally and spectrally stationary light waves resulting...

Im Focus: Overdosing on Calcium

Nano crystals impact stem cell fate during bone formation

Scientists from the University of Freiburg and the University of Basel identified a master regulator for bone regeneration. Prasad Shastri, Professor of...

Im Focus: AchemAsia 2019 will take place in Shanghai

Moving into its fourth decade, AchemAsia is setting out for new horizons: The International Expo and Innovation Forum for Sustainable Chemical Production will take place from 21-23 May 2019 in Shanghai, China. With an updated event profile, the eleventh edition focusses on topics that are especially relevant for the Chinese process industry, putting a strong emphasis on sustainability and innovation.

Founded in 1989 as a spin-off of ACHEMA to cater to the needs of China’s then developing industry, AchemAsia has since grown into a platform where the latest...

Im Focus: First real-time test of Li-Fi utilization for the industrial Internet of Things

The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.

Modern production technologies in the automobile industry must become more flexible in order to fulfil individual customer requirements.

Im Focus: Sharp images with flexible fibers

An international team of scientists has discovered a new way to transfer image information through multimodal fibers with almost no distortion - even if the fiber is bent. The results of the study, to which scientist from the Leibniz-Institute of Photonic Technology Jena (Leibniz IPHT) contributed, were published on 6thJune in the highly-cited journal Physical Review Letters.

Endoscopes allow doctors to see into a patient’s body like through a keyhole. Typically, the images are transmitted via a bundle of several hundreds of optical...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Munich conference on asteroid detection, tracking and defense

13.06.2018 | Event News

2nd International Baltic Earth Conference in Denmark: “The Baltic Sea region in Transition”

08.06.2018 | Event News

ISEKI_Food 2018: Conference with Holistic View of Food Production

05.06.2018 | Event News

 
Latest News

Graphene assembled film shows higher thermal conductivity than graphite film

22.06.2018 | Materials Sciences

Fast rising bedrock below West Antarctica reveals an extremely fluid Earth mantle

22.06.2018 | Earth Sciences

Zebrafish's near 360 degree UV-vision knocks stripes off Google Street View

22.06.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>