Related Experiment Video
Updated: Jul 12, 2025
Studying TGF-β Signaling and TGF-β-induced Epithelial-to-mesenchymal Transition in Breast Cancer and Normal Cells
Published on: October 27, 2020
Talin-1 inhibits Smurf1-mediated Stat3 degradation to modulate β-cell proliferation and mass in mice
Xiaoting Hou1, Yangshan Chen1, Bo Zhou1
1Department of Biochemistry, School of Medicine, Southern University of Science and Technology, Key University Laboratory of Metabolism and Health of Guangdong, Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Southern University of Science and Technology, Shenzhen, 518055, China.
Abstract:
Insufficient pancreatic β-cell mass and reduced insulin expression are key events in the pathogenesis of diabetes mellitus (DM). Here we demonstrate the high expression of Talin-1 in β-cells and that deficiency of Talin-1 reduces β-cell proliferation, which leads to reduced β-cell mass and insulin expression, thus causing glucose intolerance without affecting peripheral insulin sensitivity in mice. High-fat diet fed exerbates these phenotypes. Mechanistically, Talin-1 interacts with the E3 ligase smad ubiquitination regulatory factor 1 (Smurf1), which prohibits ubiquitination of the signal transducer and activator of transcription 3 (Stat3) mediated by Smurf1, and ablation of Talin-1 enhances Smurf1-mediated ubiquitination of Stat3, leading to decreased β-cell proliferation and mass. Furthermore, haploinsufficiency of Talin-1 and Stat3 genes, but not that of either gene, in β-cell in mice significantly impairs glucose tolerance and insulin expression, indicating that both factors indeed function in the same genetic pathway. Finally, inducible deletion Talin-1 in β-cell causes glucose intolerance in adult mice. Collectively, our findings reveal that Talin-1 functions as a crucial regulator of β-cell mass, and highlight its potential as a therapeutic target for DM patients.
Insights
Talin-1 deficiency in pancreatic beta cells reduces their mass and insulin expression, leading to glucose intolerance. This protein is crucial for maintaining beta cell mass and may be a therapeutic target for diabetes mellitus.
Area of Science:
- Endocrinology
- Cell Biology
- Molecular Biology
Background:
- Diabetes mellitus (DM) pathogenesis involves insufficient pancreatic beta-cell mass and reduced insulin expression.
- Talin-1 is highly expressed in pancreatic beta cells.
Purpose of the Study:
- To investigate the role of Talin-1 in regulating beta-cell mass and function.
- To elucidate the molecular mechanisms by which Talin-1 influences beta-cell proliferation and insulin expression.
Main Methods:
- Studied Talin-1 deficiency in mouse models.
- Utilized high-fat diet models to exacerbate phenotypes.
- Investigated molecular interactions using ubiquitination assays.
- Examined gene interactions through haploinsufficiency studies.
- Performed inducible deletion of Talin-1 in adult mice.
Main Results:
- Talin-1 deficiency reduced beta-cell proliferation, leading to decreased beta-cell mass and insulin expression.
- This resulted in glucose intolerance in mice without affecting peripheral insulin sensitivity.
- High-fat diet exacerbated these diabetes mellitus-like phenotypes.
- Talin-1 interacts with Smurf1 to inhibit Stat3 ubiquitination; Talin-1 ablation enhances this process.
- Haploinsufficiency of Talin-1 and Stat3 impaired glucose tolerance and insulin expression.
- Inducible deletion of Talin-1 in adult beta cells caused glucose intolerance.
Conclusions:
- Talin-1 is a critical regulator of pancreatic beta-cell mass.
- The Talin-1-Smurf1-Stat3 pathway is essential for beta-cell proliferation and mass maintenance.
- Talin-1 represents a potential therapeutic target for managing diabetes mellitus.
Related Concept Videos
01:16TGF - β Signaling Pathway
01:22PI3K/mTOR/AKT Signaling Pathway
01:58Cell Specific Gene Expression
01:20The JAK-STAT Signaling Pathway