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Electrical coupling between cells in islets of Langerhans from mouse
The Journal of Membrane Biology
|January 1, 1984
Summary
Mouse pancreatic islet cells are electrically coupled, with glucose concentration significantly affecting this connection. This coupling is crucial for cell communication and insulin secretion regulation.
Area of Science:
- Endocrinology
- Cell Biology
- Physiology
Background:
- Pancreatic islet cells communicate electrically, influencing insulin secretion.
- Understanding this electrical coupling is key to metabolic regulation.
Purpose of the Study:
- To investigate electrical coupling between mouse pancreatic islet beta-cells.
- To determine the influence of glucose concentration on this coupling.
Main Methods:
- Simultaneous microelectrode impalement of adjacent islet cells.
- Current injection and membrane potential recording.
- Varying glucose concentrations and applying mitochondrial blockers.
Main Results:
- Demonstrated electrical coupling between pancreatic islet cells.
- Coupling ratio (V2/V1) increased with glucose concentration (0-22 mM).
- Glucose removal rapidly decreased coupling; mitochondrial blockers increased junctional resistance.
Conclusions:
- Electrical coupling in pancreatic islets is glucose-dependent.
- Coupling influences cell-to-cell communication and potentially insulin secretion.
- Junctional resistance is modulated by glucose and potentially intracellular calcium.