Related Experiment Video
Updated: Nov 18, 2025
An In Vitro Protocol for Evaluating MicroRNA Levels, Functions, and Associated Target Genes in Tumor Cells
Published on: May 21, 2019
microRNA-483 Protects Pancreatic β-Cells by Targeting ALDH1A3
Zhihong Wang1, Ramkumar Mohan1, Xinqian Chen1
1Department of Biological Sciences, Michigan Technological University, Houghton, MI, USA.
Abstract:
Pancreatic β-cell dysfunction is central to the development and progression of type 2 diabetes. Dysregulation of microRNAs (miRNAs) has been associated with pancreatic islet dysfunction in type 2 diabetes. Previous study has shown that miR-483 is expressed relatively higher in β-cells than in α-cells. To explore the physiological function of miR-483, we generated a β-cell-specific knockout mouse model of miR-483. Loss of miR-483 enhances high-fat diet-induced hyperglycemia and glucose intolerance by the attenuation of diet-induced insulin release. Intriguingly, mice with miR-483 deletion exhibited loss of β-cell features, as indicated by elevated expression of aldehyde dehydrogenase family 1, subfamily A3 (Aldh1a3), a marker of β-cell dedifferentiation. Moreover, Aldh1a3 was validated as a direct target of miR-483 and overexpression of miR-483 repressed Aldh1a3 expression. Genetic ablation of miR-483 also induced alterations in blood lipid profile. Collectively, these data suggest that miR-483 is critical in protecting β-cell function by repressing the β-cell disallowed gene Aldh1a3. The dysregulated miR-483 may impair insulin secretion and initiate β-cell dedifferentiation during the development of type 2 diabetes.
Insights
MicroRNA-483 (miR-483) loss worsens type 2 diabetes by impairing insulin release and causing pancreatic beta-cell dedifferentiation. This highlights miR-483
Area of Science:
- Endocrinology and Metabolism
- Molecular Biology
- Diabetes Research
Background:
- Pancreatic beta-cell dysfunction is a key factor in type 2 diabetes pathogenesis.
- MicroRNA (miRNA) dysregulation is implicated in pancreatic islet dysfunction.
- miR-483 is expressed at higher levels in beta-cells compared to alpha-cells.
Purpose of the Study:
- To investigate the physiological role of miR-483 in pancreatic beta-cell function.
- To determine the impact of miR-483 loss on glucose homeostasis and beta-cell characteristics.
Main Methods:
- Generation of a beta-cell-specific miR-483 knockout mouse model.
- Assessment of glucose tolerance and insulin release following high-fat diet challenge.
- Analysis of beta-cell specific gene expression, including Aldh1a3, and validation of miR-483 targeting.
Main Results:
- Loss of miR-483 exacerbated high-fat diet-induced hyperglycemia and glucose intolerance.
- miR-483 deficiency led to impaired diet-induced insulin release and beta-cell dedifferentiation, marked by increased Aldh1a3 expression.
- Aldh1a3 was confirmed as a direct target repressed by miR-483; miR-483 ablation altered blood lipid profiles.
Conclusions:
- miR-483 plays a critical role in maintaining beta-cell function by suppressing the beta-cell disallowed gene Aldh1a3.
- Dysregulation of miR-483 may contribute to impaired insulin secretion and beta-cell dedifferentiation in type 2 diabetes development.
- These findings identify miR-483 as a potential therapeutic target for type 2 diabetes.
Related Concept Videos
01:22MicroRNAs
01:22MicroRNAs