This record provides bibliographic details and links to the original research. An editorial study breakdown is not available.
What the researchers found
A triple-receptor agonist targeting GLP-1, GIP, and glucagon receptors boosted insulin secretion primarily through the GLP-1 receptor and the Gαq-TRPM5 signaling pathway in mouse islets. Removing this pathway eliminated the drug's blood sugar benefits in obese mice.
Why it matters
Triple-receptor agonists are the next generation of obesity and diabetes drugs. Understanding that their insulin-boosting power comes mainly through GLP-1R and Gαq signaling helps guide future drug design.
The numbers in context
IUB447 triagonist tested. Enhanced insulin secretion more than co-administered mono-agonists. Effect unchanged without GIP or glucagon receptors. Effect eliminated without both GLP-1R and GIPR, or with GLP-1R antagonist exendin-3(9-39). Gαq blocker YM254890 and TRPM5 blocker TPPO suppressed the effect. Trpm5 knockout mice showed no glycemic benefit.
How the study worked
Isolated islets from WT, Gipr-/-, Gcgr-/-, Glp1r/Gipr double-KO, and Trpm5-/- mice. Measured glucose-stimulated insulin secretion with triagonist vs mono-agonists. In vivo metabolic testing in WT and Trpm5-/- mice on chow and high-fat diets.
Who was studied
Wild-type and knockout mice; isolated pancreatic islets
What this study cannot tell us
Mouse study only. Human islet signaling may differ. Single triagonist compound tested. In vivo results limited to one mouse strain and diet model.
Read the original research
GLP-1/GIP/GCG receptor triagonist (IUB447) enhances insulin secretion via GLP-1 receptor and Gαq signalling pathway in mice.
Diabetologia, 68(11), 2567-2580
Citation
Schreier, Pascale C F; Beyerle, Philipp; Boulassel, Severin; Beck, Andreas; Novikoff, Aaron; Reinach, Peter S; Boekhoff, Ingrid; Breit, Andreas; Neuberger, Arthur; Müller, Timo D; Serrano, Alberto Cebrian; Gudermann, Thomas; Khajavi, Noushafarin. (2025). GLP-1/GIP/GCG receptor triagonist (IUB447) enhances insulin secretion via GLP-1 receptor and Gαq signalling pathway in mice.. Diabetologia, 68(11), 2567-2580. https://doi.org/10.1007/s00125-025-06525-0