| First Author | Blandino-Rosano M | Year | 2022 |
| Journal | Am J Physiol Endocrinol Metab | Volume | 323 |
| Issue | 2 | Pages | E133-E144 |
| PubMed ID | 35723227 | Mgi Jnum | J:362292 |
| Mgi Id | MGI:7330066 | Doi | 10.1152/ajpendo.00076.2022 |
| Citation | Blandino-Rosano M, et al. (2022) Novel roles of mTORC2 in regulation of insulin secretion by actin filament remodeling. Am J Physiol Endocrinol Metab 323(2):E133-E144 |
| abstractText | Mammalian target of rapamycin (mTOR) kinase is an essential hub where nutrients and growth factors converge to control cellular metabolism. mTOR interacts with different accessory proteins to form complexes 1 and 2 (mTORC), and each complex has different intracellular targets. Although mTORC1's role in beta-cells has been extensively studied, less is known about mTORC2's function in beta-cells. Here, we show that mice with constitutive and inducible beta-cell-specific deletion of RICTOR (betaRicKO and ibetaRicKO mice, respectively) are glucose intolerant due to impaired insulin secretion when glucose is injected intraperitoneally. Decreased insulin secretion in betaRicKO islets was caused by abnormal actin polymerization. Interestingly, when glucose was administered orally, no difference in glucose homeostasis and insulin secretion were observed, suggesting that incretins are counteracting the mTORC2 deficiency. Mechanistically, glucagon-like peptide-1 (GLP-1), but not gastric inhibitory polypeptide (GIP), rescued insulin secretion in vivo and in vitro by improving actin polymerization in betaRicKO islets. In conclusion, mTORC2 regulates glucose-stimulated insulin secretion by promoting actin filament remodeling.NEW & NOTEWORTHY The current studies uncover a novel mechanism linking mTORC2 signaling to glucose-stimulated insulin secretion by modulation of the actin filaments. This work also underscores the important role of GLP-1 in rescuing defects in insulin secretion by modulating actin polymerization and suggests that this effect is independent of mTORC2 signaling. |
