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Updated: Oct 25, 2025
A High-content In Vitro Pancreatic Islet β-cell Replication Discovery Platform
Published on: July 16, 2016
TRPM7 is a crucial regulator of pancreatic endocrine development and high-fat-diet-induced β-cell proliferation
Molly K Altman1, Charles M Schaub1, Prasanna K Dadi1
1Department of Molecular Physiology and Biophysics, Vanderbilt University, 7425B MRB IV, 2213 Garland Ave., Nashville, TN 37232, USA.
Abstract:
The melastatin subfamily of the transient receptor potential channels (TRPM) are regulators of pancreatic β-cell function. TRPM7 is the most abundant islet TRPM channel; however, the role of TRPM7 in β-cell function has not been determined. Here, we used various spatiotemporal transgenic mouse models to investigate how TRPM7 knockout influences pancreatic endocrine development, proliferation and function. Ablation of TRPM7 within pancreatic progenitors reduced pancreatic size, and α-cell and β-cell mass. This resulted in modestly impaired glucose tolerance. However, TRPM7 ablation following endocrine specification or in adult mice did not impact endocrine expansion or glucose tolerance. As TRPM7 regulates cell proliferation, we assessed how TRPM7 influences β-cell hyperplasia under insulin-resistant conditions. β-Cell proliferation induced by high-fat diet was significantly decreased in TRPM7-deficient β-cells. The endocrine roles of TRPM7 may be influenced by cation flux through the channel, and indeed we found that TRPM7 ablation altered β-cell Mg2+ and reduced the magnitude of elevation in β-cell Mg2+ during proliferation. Together, these findings revealed that TRPM7 controls pancreatic development and β-cell proliferation, which is likely due to regulation of Mg2+ homeostasis.
Insights
Transient Receptor Potential Melastatin 7 (TRPM7) channels are crucial for pancreatic development and beta-cell proliferation. TRPM7 knockout impairs pancreatic growth and beta-cell hyperplasia, impacting glucose homeostasis.
Area of Science:
- Endocrinology
- Molecular Biology
- Physiology
Background:
- The melastatin subfamily of transient receptor potential channels (TRPM) are regulators of pancreatic beta-cell function.
- TRPM7 is the most abundant TRPM channel in pancreatic islets, but its specific role in beta-cell function remains unclear.
Purpose of the Study:
- To investigate the influence of TRPM7 knockout on pancreatic endocrine development, beta-cell proliferation, and overall function using spatiotemporal transgenic mouse models.
Main Methods:
- Utilized various spatiotemporal transgenic mouse models to achieve TRPM7 ablation at different developmental stages.
- Assessed pancreatic size, alpha-cell and beta-cell mass, glucose tolerance, and beta-cell proliferation under insulin-resistant conditions (high-fat diet).
- Measured intracellular magnesium (Mg2+) levels in beta-cells.
Main Results:
- TRPM7 ablation in pancreatic progenitors reduced pancreatic size, alpha-cell and beta-cell mass, leading to impaired glucose tolerance.
- TRPM7 ablation after endocrine specification or in adult mice did not affect endocrine expansion or glucose tolerance.
- TRPM7 deficiency significantly decreased beta-cell proliferation during high-fat diet-induced insulin resistance and altered beta-cell Mg2+ homeostasis.
Conclusions:
- TRPM7 plays a critical role in regulating pancreatic development and beta-cell proliferation.
- TRPM7's function in endocrine cells is likely mediated through its regulation of Mg2+ homeostasis.
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