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Updated: Aug 22, 2025

A High-content In Vitro Pancreatic Islet β-cell Replication Discovery Platform
Published on: July 16, 2016
The human batokine EPDR1 regulates β-cell metabolism and function
Luis Rodrigo Cataldo1, Qian Gao2, Lidia Argemi-Muntadas2
1The Novo Nordisk Foundation Centre for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, DK-2200 Denmark; Lund University Diabetes Centre, Clinical Research Center, Sweden; Department of Clinical Sciences in Malmö, Lund University, Sweden.
Ependymin-Related Protein 1 (EPDR1) upregulation in type 2 diabetes may enhance pancreatic beta-cell function by improving glucose metabolism and insulin secretion. This protein aids in channeling pyruvate to the TCA cycle, crucial for glucose homeostasis.
Area of Science:
- Endocrinology and Metabolism
- Cell Biology
- Diabetes Research
Background:
- Ependymin-Related Protein 1 (EPDR1) is a secreted batokine regulating mitochondrial respiration and thermogenesis.
- EPDR1 is expressed in human pancreatic beta-cells, where mitochondrial metabolism is vital for insulin secretion.
- The specific role of EPDR1 in beta-cell function and metabolism remains uninvestigated.
Purpose of the Study:
- To investigate the role of EPDR1 in human pancreatic beta-cell metabolism and function.
- To determine EPDR1 expression levels in non-diabetic and type 2 diabetes (T2D) pancreatic islets.
- To elucidate the impact of EPDR1 modulation on glucose-stimulated insulin secretion (GSIS) and mitochondrial activity.
Main Methods:
- Assessed EPDR1 mRNA levels in human pancreatic islets from non-diabetic and T2D subjects.
- Utilized siRNA to silence EPDR1 (EPDR1-KD) and treated cells with EPDR1 protein.
- Evaluated GSIS using ELISA, mitochondrial metabolism via extracellular flux analysis, and performed metabolomics analysis.
Main Results:
- EPDR1 mRNA was upregulated in T2D and obese donors, correlating with BMI.
- EPDR1 silencing reduced GSIS, while EPDR1 protein treatment increased it.
- EPDR1 deficiency impaired glucose-stimulated insulin secretion, pyruvate metabolism, TCA cycle activity, and mitochondrial respiration.
Conclusions:
- Upregulation of EPDR1 in obesity may enhance beta-cell function.
- EPDR1 appears to improve glucose homeostasis by directing glycolysis-derived pyruvate to the mitochondrial TCA cycle.
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