November 29, 2010
New Mechanism Controls Blood Sugar Level
Advance in understanding of insulin secretion could impact on diabetes control
Medical scientists at the University of Leicester have identified for the first time a new way in which our body controls the levels of sugar in our blood following a meal.They have discovered the part played by a particular protein in helping to maintain correct blood sugar levels.
The breakthrough was made in the University of Leicester by a team led by Professor Andrew Tobin, Professor of Cell Biology, who is a Wellcome Trust Senior Research Fellow. The research is published online ahead of print in the prestigious international scientific journal the Proceedings of the National Academy of Sciences.
Professor Tobin said: "The work, which was done wholly at the University of Leicester, is focused on the mechanisms by which our bodies control the level of sugar in our blood following a meal.
"We found that in order to maintain the correct levels of sugar, a protein present on the cells that release insulin in the pancreas has to be active. This protein, called the M3-muscarinic receptor, is not only active but also needs to undergo a specific change. This change triggers insulin release and the control of blood sugar levels."
Professor Tobin added: "Without the change in the M3-muscarinic receptor protein sugar levels go up in the same way that we see in diabetes. We are of course testing if the mechanism of controlling sugar levels we have discovered is one of the mechanisms disrupted in diabetes. If this were the case then our studies would have important implications in diabetes."
The paper was authored by: Kok Choi Kong, Adrian J. Butcher, Phillip McWilliams, David Jones, Sarah E. Munson, Hannah A. Cragg, Alison D. Smart and Andrew B. Tobin at the University of Leicester, Jrgen Wess at the National Institutes of Health, Fadi F. Hamdan at the University of Montreal, Tim Werry at the GlaxoSmithKline, and Elizabeth M. Rosethorne, Steven J. Charlton at Novartis Institutes for Biomedical Research.
The work was funded by the Wellcome Trust.
M3-muscarinic receptor promotes insulin release via receptor phosphorylation/arrestin-dependent activation of protein kinase D1 appeared in the Proceedings of the National Academy of Sciences (PNAS).
Image Caption: This hematoxylin- and eosin-stained pancreatic slice illustrates an islet of Langerhans adjacent to a capillary. Credit: University of Leicester
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