miR-204 Controls Glucagon-Like Peptide 1 Receptor Expression and Agonist Function
| Autor: | Guanlan Xu, Lance A. Thielen, Seong Ho Jo, Truman Grayson, Junqin Chen, Anath Shalev |
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| Rok vydání: | 2017 |
| Předmět: |
Male
0301 basic medicine Endocrinology Diabetes and Metabolism Receptor expression medicine.medical_treatment Incretin Glucagon-Like Peptide-1 Receptor Diabetes Mellitus Experimental 03 medical and health sciences 0302 clinical medicine Genes Reporter Cell Line Tumor Insulin-Secreting Cells Insulin Secretion Internal Medicine medicine Animals Humans Hypoglycemic Agents Insulin Glucose homeostasis Receptor 3' Untranslated Regions Cells Cultured Glucagon-like peptide 1 receptor Mice Knockout Chemistry Glucagon-like peptide-1 Recombinant Proteins Rats Cell biology Mice Inbred C57BL MicroRNAs HEK293 Cells 030104 developmental biology Islet Studies Gene Expression Regulation 030220 oncology & carcinogenesis Mutation RNA RNA Interference TXNIP |
| Zdroj: | Diabetes |
| ISSN: | 1939-327X 0012-1797 |
| DOI: | 10.2337/db17-0506 |
| Popis: | Glucagon-like peptide 1 receptor (GLP1R) agonists are widely used to treat diabetes. However, their function is dependent on adequate GLP1R expression, which is downregulated in diabetes. GLP1R is highly expressed on pancreatic β-cells, and activation by endogenous incretin or GLP1R agonists increases cAMP generation, which stimulates glucose-induced β-cell insulin secretion and helps maintain glucose homeostasis. We now have discovered that the highly β-cell–enriched microRNA, miR-204, directly targets the 3′ UTR of GLP1R and thereby downregulates its expression in the β-cell–derived rat INS-1 cell line and primary mouse and human islets. Furthermore, in vivo deletion of miR-204 promoted islet GLP1R expression and enhanced responsiveness to GLP1R agonists, resulting in improved glucose tolerance, cAMP production, and insulin secretion as well as protection against diabetes. Since we recently identified thioredoxin-interacting protein (TXNIP) as an upstream regulator of miR-204, we also assessed whether in vivo deletion of TXNIP could mimic that of miR-204. Indeed, it also enhanced islet GLP1R expression and GLP1R agonist–induced insulin secretion and glucose tolerance. Thus, the present studies show for the first time that GLP1R is under the control of a microRNA, miR-204, and uncover a previously unappreciated link between TXNIP and incretin action. |
| Databáze: | OpenAIRE |
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