Paracrine Crosstalk between Intestinal L- and D-cells Controls Secretion of Glucagon-Like Peptide-1 in mice
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Sara L Jepsen, Kaare V Grunddal, Nicolai J Wewer Albrechtsen, Maja S Engelstoft, Maria B N Gabe, Elisa P Jensen, Cathrine Ørskov, Steen S Poulsen, Mette M Rosenkilde, Jens Pedersen, Fiona M Gribble, Frank Reimann, Carolyn F Deacon, Thue W Schwartz, Andreas D Christ, Rainer E Martin, Jens J Holst
DPP-4 inhibitors, used for treatment of type 2 diabetes, act by increasing the concentrations of intact GLP-1 but at the same time they inhibit secretion of GLP-1, perhaps by a negative feed-back mechanism. We hypothesized that GLP-1 secretion is feed-back regulated by somatostatin from neighbouring D-cells, and blocking this feed-back circuit results in increased GLP-1 secretion. We used a wide range of experimental techniques including gene expression analysis, immunohistochemical approaches and the perfused mouse intestine to characterise the paracrine circuit controlling GLP-1 and somatostatin. We show that 1) antagonising the SSTr2 and SSTr5 led to increased GLP-1 and somatostatin secretion in the mouse, 2) that SS exhibits strong tonic inhibition of GLP-1 secretion preferentially through SSTr5 and 3) that the secretion of somatostatin was GLP-1 receptor dependent. We conclude that SS is a tonic inhibitor of GLP-1 secretion and interventions in the somatostain-GLP-1 paracrine loop leads to increased GLP-1 secretion.
|Journal||A J P: Endocrinology and Metabolism (Online)|
|Publication status||E-pub ahead of print - 10 Sep 2019|