Insulin Release Depends on Glucagon Signals Within the Pancreas

Glucagon stimulates insulin secretion through both glucagon and GLP-1 receptors.

• Glucagon's role in insulin secretion is supported by findings in various mouse models.
• Loss of either glucagon or GLP-1 receptors does not significantly alter insulin responses.
• Blocking both glucagon and GLP-1 receptors together leads to a notable reduction in insulin secretion.
• Active GLP-1 was identified in pancreatic perfusate from mice lacking glucagon receptors, indicating a link between glucagon action and GLP-1 receptor activation.
• The combined action of glucagon and GLP-1 receptors is essential for proper insulin secretion in pancreatic β cells.

Simplified