ENDOCRINE FUNCTION OF THE SURGICALLY REDUCED PANCREAS

Area of Science:

• Endocrinology
• Physiology

Background:

• The pancreas plays a crucial role in regulating blood glucose levels through insulin secretion.
• Partial pancreatectomy can impact the organ's functional reserve.

Purpose of the Study:

• To investigate the functional capacity of a reduced pancreas in maintaining glycemic control.
• To assess the relationship between pancreatic remnant size and insulin secretion reserve.

Main Methods:

• Partial pancreatectomy was performed on dogs, reducing pancreatic weight to 4 gm or 10 gm.
• Glycemic response to intravenous glucose load was measured.
• Sensitivity to diabetogenic agents (anterior hypophysis extract) was assessed.
• Functional recovery after pancreatic grafting in pancreatectomized animals was evaluated.

Main Results:

• Dogs with a 4 gm or 10 gm pancreatic remnant could maintain normal glycemic levels under basal conditions.
• A 4 gm pancreatic remnant exhibited diminished insulin secretion capacity under strain.
• A 10 gm remnant showed variable capacity, ranging from normal to decreased.
• Reduced pancreatic function was evidenced by prolonged hyperglycemia after glucose challenge and increased sensitivity to diabetogenic agents.
• Grafting of reduced pancreatic tissue demonstrated that recovery time was inversely proportional to the weight of the transplanted tissue.

Conclusions:

• The size of the pancreatic remnant significantly influences its capacity to secrete insulin and maintain glycemic homeostasis, particularly under stress.
• A critically reduced pancreas (e.g., 4 gm) has a limited functional reserve, increasing susceptibility to hyperglycemia and diabetes.
• Pancreatic tissue weight is a key determinant of functional recovery and glycemic control restoration.