idw – Informationsdienst Wissenschaft

Nachrichten, Termine, Experten

Grafik: idw-Logo
Science Video Project
idw-Abo

idw-News App:

AppStore

Google Play Store



Instanz:
Teilen: 
26.04.2019 12:26

New discovery could lead to improved blood sugar level control

Press Officer Linda Koffmar Kommunikationsavdelningen / Communications Department
Schwedischer Forschungsrat - The Swedish Research Council

    Many diabetes patients do not only have problems with their insulin, but also with the release of the hormone glucagon. Researchers at Uppsala University have now discovered a regulation mechanism which could provide an opportunity to improve blood glucose control in these patients. The research is published in the journal Diebetologia.

    The hormone glucagon, which is released from alpha cells in the pancreas, plays a vital role in blood glucose regulation. The release of glucagon is normally inhibited when the blood glucose concentration increases after a meal, and when the glucose concentration eventually drops, the alpha cells resume the secretion of glucagon, which in turn stimulates the liver to release glucose into the blood. This mechanism prevents the blood glucose from reaching dangerously low levels between meals and during starvation.

    In many ways glucagon acts opposite to the better-known hormone insulin, which lowers blood glucose and which is released in insufficient amounts in diabetes. However, many diabetes patients also show disturbed glucagon release. Accordingly, glucagon is often stimulated after a meal, which aggravates the patients’ already high blood glucose levels. On the other hand, there is insufficient release of glucagon when blood glucose drops to low levels, which can be life-threatening in insulin-treated diabetes patients.

    Despite the essential functions of glucagon little is known about how blood glucose controls the release of the hormone. By utilizing advanced microscopy techniques to measure different signalling molecules in alpha cells, researchers at Uppsala university have discovered a new regulatory mechanism.

    The release of almost all hormones is triggered when the concentration of calcium ions increases beneath the cell membrane. In alpha cells, however, the calcium levels are already increased irrespective of whether the glucose concentration is low or high. So even if calcium is required for glucagon to be released, it seems that another signal is controlling how much of the hormone that is secreted.

    When the researchers measured the signalling molecule cyclic adenosine monophosphate (cAMP), which by itself cannot trigger hormone release but which amplifies the effects of calcium, it was discovered that glucose influences the cAMP levels in a manner that correspond to glucagon secretion.

    By fixing cAMP levels constantly high in the cells, the regulatory effect of glucose could be prevented. The discovery that blood glucose controls glucagon release by direct effects on alpha cell cAMP is important because it may lead to new possibilities to improve glucose control in diabetes patients.


    Wissenschaftliche Ansprechpartner:

    For more information, please contact professor Anders Tengholm, Department of Medical Cell Biology, Uppsala university. Email: anders.tengholm@mcb.uu.se Tel: +46-18-4714481.


    Originalpublikation:

    Yu, Q., Shuai, H., Ahooghalandari, P., Gylfe, E., Tengholm, A. 2019. Glucose controls glucagon secretion by directly modulating cAMP in alpha cells. Diabetologia, doi: 10.1007/s00125-019-4857-6


    Bilder

    Merkmale dieser Pressemitteilung:
    Journalisten
    Medizin
    überregional
    Wissenschaftliche Publikationen
    Englisch


     

    Hilfe

    Die Suche / Erweiterte Suche im idw-Archiv
    Verknüpfungen

    Sie können Suchbegriffe mit und, oder und / oder nicht verknüpfen, z. B. Philo nicht logie.

    Klammern

    Verknüpfungen können Sie mit Klammern voneinander trennen, z. B. (Philo nicht logie) oder (Psycho und logie).

    Wortgruppen

    Zusammenhängende Worte werden als Wortgruppe gesucht, wenn Sie sie in Anführungsstriche setzen, z. B. „Bundesrepublik Deutschland“.

    Auswahlkriterien

    Die Erweiterte Suche können Sie auch nutzen, ohne Suchbegriffe einzugeben. Sie orientiert sich dann an den Kriterien, die Sie ausgewählt haben (z. B. nach dem Land oder dem Sachgebiet).

    Haben Sie in einer Kategorie kein Kriterium ausgewählt, wird die gesamte Kategorie durchsucht (z.B. alle Sachgebiete oder alle Länder).