Agonist-induced membrane nanodomain clustering drives GLP-1 receptor responses in pancreatic beta cells

by Teresa Buenaventura, Stavroula Bitsi, William E. Laughlin, Thomas Burgoyne, Zekun Lyu, Affiong I. Oqua, Hannah Norman, Emma R. McGlone, Andrey S. Klymchenko, Ivan R. Corr êa Jr, Abigail Walker, Asuka Inoue, Aylin Hanyaloglu, Jak Grimes, Zsombor Koszegi, Davide Calebiro, Guy A. Rutter, Stephen R. Bloom, Ben Jones, Alejandra Tomas The glucagon-like peptide-1 receptor (GLP-1R), a key pharmacological target in type 2 diabetes (T2D) and obesity, undergoes rapid endocytosis after stimulation by endogenous and therapeutic agonists. We have previously highlighted the relevance of this process in fine-tuning GLP-1R responses in pa ncreatic beta cells to control insulin secretion. In the present study, we demonstrate an important role for the translocation of active GLP-1Rs into liquid-ordered plasma membrane nanodomains, which act as hotspots for optimal coordination of intracellular signaling and clathrin-mediated endocytosi s. This process is dynamically regulated by agonist binding through palmitoylation of the GLP-1R at its carboxyl-terminal tail. Biased GLP-1R agonists and small molecule allosteric modulation both influence GLP-1R palmitoylation, clustering, nanodomain signaling, and internalization. Downstream effe cts on insulin secretion from pancreatic beta cells indicate that these processes are relevant to GLP-1R physiological actions and might be therapeutically targetable.
Source: PLoS Biology: Archived Table of Contents - Category: Biology Authors: Source Type: research

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Source: Frontiers in Pharmacology - Category: Drugs & Pharmacology Source Type: research
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Source: Fight Aging! - Category: Research Authors: Tags: Newsletters Source Type: blogs
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Source: Biochimica et Biophysica Acta (BBA) Molecular Basis of Disease - Category: Molecular Biology Source Type: research
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Source: Frontiers in Immunology - Category: Allergy & Immunology Source Type: research
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Source: Frontiers in Physiology - Category: Physiology Source Type: research
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Source: Frontiers in Pharmacology - Category: Drugs & Pharmacology Source Type: research
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Source: Frontiers in Genetics - Category: Genetics & Stem Cells Source Type: research
Conclusions In conclusion, articles in this Research Topic made a very significant contribution to our understanding of the role played by environmental factors, dysbiotic conditions, and infections in triggering diseases. Since this is a rapidly expanding area of research, many other factors contributing to the onset of these diseases are not covered here. We are confident, however, that further studies will expand the list as well as bring a better understanding of mechanisms involved in the onset of autoimmune and autoinflammatory diseases. Author Contributions All authors listed have made a substantial, direct and i...
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Source: Frontiers in Immunology - Category: Allergy & Immunology Source Type: research
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Source: Frontiers in Physiology - Category: Physiology Source Type: research
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