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 Millions through license revenues
27.04.2017 | Rheinische Friedrich-Wilhelms-Universität Bonn

nachricht New High-Performance Center Translational Medical Engineering
26.04.2017 | Fraunhofer ITEM

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: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Fighting drug resistant tuberculosis – InfectoGnostics meets MYCO-NET² partners in Peru

28.04.2017 | Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

 
Latest News

Wireless power can drive tiny electronic devices in the GI tract

28.04.2017 | Medical Engineering

Ice cave in Transylvania yields window into region's past

28.04.2017 | Earth Sciences

Nose2Brain – Better Therapy for Multiple Sclerosis

28.04.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>