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The NERP-4-SNAT2 axis regulates pancreatic β-cell maintenance and function.
Weidong Zhang1,2, Ayako Miura2,3, Md Moin Abu Saleh2,4
1Department of Bioregulatory Sciences, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan.
Nature Communications
|December 9, 2023
Summary
Neuroendocrine regulatory peptide-4 (NERP-4) enhances insulin secretion by stimulating amino acid uptake in pancreatic beta cells. This peptide-amino acid transporter axis is crucial for beta cell function and maintenance.
Area of Science:
- Endocrinology
- Cell Biology
- Metabolism
Background:
- Insulin secretion from pancreatic beta cells is regulated by various factors, including nutrients and hormones.
- Amino acids influence insulin secretion through specific transporters on beta cells.
- The VGF protein and its derived peptide, NERP-4, play roles in beta cell function.
Purpose of the Study:
- To investigate the role of NERP-4 in regulating insulin secretion and beta cell function.
- To elucidate the mechanism by which NERP-4 affects beta cells, focusing on amino acid transport.
- To determine if NERP-4 can protect beta cells in a model of diabetes.
Main Methods:
- Measuring Ca2+ influx in pancreatic tissue from transgenic mice.
- Assessing glucose-stimulated insulin secretion from isolated human and mouse islets and beta-cell lines.
- Evaluating the effects of NERP-4 on beta-cell function and mitochondrial activity in db/db mice.
- Investigating the interaction of NERP-4 with the sodium-coupled neutral amino acid transporter 2 (SNAT2) and its impact on amino acid uptake.
- Examining the consequences of SNAT2 deletion or inhibition on NERP-4's protective effects.
Main Results:
- NERP-4 increases Ca2+ influx and enhances glucose-stimulated insulin secretion in various models.
- NERP-4 administration improves beta-cell maintenance and function in db/db mice by boosting mitochondrial function and reducing metabolic stress.
- NERP-4 stimulates insulin secretion by acting on SNAT2, increasing the uptake of glutamine, alanine, and proline.
- SNAT2 deletion or inhibition abrogates the protective effects of NERP-4 on beta-cell maintenance.
Conclusions:
- NERP-4 represents a novel autocrine mechanism for regulating beta cell function and maintenance.
- The peptide-amino acid transporter axis, specifically involving NERP-4 and SNAT2, is critical for beta cell health.
- NERP-4 holds potential therapeutic value for conditions involving beta cell dysfunction.
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