| First Author | Fonseca SG | Year | 2012 |
| Journal | Nat Cell Biol | Volume | 14 |
| Issue | 10 | Pages | 1105-12 |
| PubMed ID | 22983116 | Mgi Jnum | J:196523 |
| Mgi Id | MGI:5488685 | Doi | 10.1038/ncb2578 |
| Citation | Fonseca SG, et al. (2012) Wolfram syndrome 1 and adenylyl cyclase 8 interact at the plasma membrane to regulate insulin production and secretion. Nat Cell Biol 14(10):1105-12 |
| abstractText | Endoplasmic reticulum (ER) stress causes pancreatic beta-cell dysfunction and contributes to beta-cell loss and the progression of type 2 diabetes. Wolfram syndrome 1 (WFS1) has been shown to be an important regulator of the ER stress signalling pathway; however, its role in beta-cell function remains unclear. Here we provide evidence that WFS1 is essential for glucose- and glucagon-like peptide 1 (GLP-1)-stimulated cyclic AMP production and regulation of insulin biosynthesis and secretion. Stimulation with glucose causes WFS1 translocation from the ER to the plasma membrane, where it forms a complex with adenylyl cyclase 8 (AC8), an essential cAMP-generating enzyme in the beta-cell that integrates glucose and GLP-1 signalling. ER stress and mutant WFS1 inhibit complex formation and activation of AC8, reducing cAMP synthesis and insulin secretion. These findings reveal that an ER-stress-related protein has a distinct role outside the ER regulating both insulin biosynthesis and secretion. The reduction of WFS1 protein on the plasma membrane during ER stress is a contributing factor for beta-cell dysfunction and progression of type 2 diabetes. |
