Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Scientists explain how insulin secreting cells maintain their glucose sensitivity

06.09.2007
Scientists at the leading Swedish medical university Karolinska Institutet have now disclosed the mystery how the insulin-secreting cells maintain an appropriate number of ATP sensing ion channel proteins on their surface.

This mechanism, which is described in the latest number of Cell Metabolism, explains how the human body can keep the blood glucose concentration within the normal range and thereby avoid the development of diabetes.

Blood sugar absorbed from food has to timely enter muscles as energy supply as well as the liver and fat tissue for energy storage. Otherwise, diabetes occurs. Such glucose transport is precisely controlled by insulin, the body’s only hormone capable of lowering blood sugar. This hormone is released from insulin-secreting cells in the pancreas.

The ion channel proteins that are regulated by ATP and that transport potassium ions (KATP channels) are situated on the surface of the insulin-secreting cells to sense blood sugar and control sugar-stimulated insulin secretion. However, it has been a long-standing mystery how the insulin-secreting cells keep an appropriate number of KATP channels on their surface. Scientists at the the Rolf Luft Research Center for Diabetes and Endocrinology, Karolinska Institutet, have now disclosed a new traffic route whereby sugar promotes the insulin secretion controller KATP channel to march to its post.

Dogmatically, only two routes were believed to operate in insulin-secreting cells to deliver the macromolecules newly manufactured or modified inside cells to the cell surface where they

release or reside to function. One is referred to as a regulated insulin secretory pathway. The other is termed a constitutive pathway to renew cell surface lipids and proteins including KATP channels.

“We have now found that the newly manufactured KATP channels in insulin-secreting cells reside in a non-insulin-containing structure, which contains the regulated secretory granule marker chromogranin,” says Per-Olof Berggren. “Such a structure moves to the cell surface subsequent to elevation of sugar concentration in a Ca2+- and protein kinase A-dependent fashion.”

According to Professor Berggren the discovery is very important. This entirely new traffic route endows insulin-secreting cells with an efficient way to maintain an appropriate number of KATP channels on their surface and thereby being able to adequately keep the blood glucose concentration within the normal range thus avoiding the development of diabetes.

Katarina Sternudd | alfa
Further information:
http://ki.se

More articles from Health and Medicine:

nachricht Team discovers how bacteria exploit a chink in the body's armor
20.01.2017 | University of Illinois at Urbana-Champaign

nachricht Rabies viruses reveal wiring in transparent brains
19.01.2017 | Rheinische Friedrich-Wilhelms-Universität Bonn

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: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Helmholtz International Fellow Award for Sarah Amalia Teichmann

20.01.2017 | Awards Funding

An innovative high-performance material: biofibers made from green lacewing silk

20.01.2017 | Materials Sciences

Ion treatments for cardiac arrhythmia — Non-invasive alternative to catheter-based surgery

20.01.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>