Consequences on beta-cell function and reserve after long-term pancreas transplantation

Area of Science:

• Endocrinology
• Transplantation Immunology
• Metabolic Research

Background:

• Beta-cell replacement therapy for diabetes is advancing.
• Long-term graft function and beta-cell reserve are critical for sustained success.
• Pancreas transplantation offers insights into beta-cell function and longevity.

Purpose of the Study:

• To assess the relationship between glucose and insulin response in pancreas transplant recipients.
• To evaluate beta-cell reserve and secretory capacity post-transplantation.
• To determine long-term functional changes in transplanted beta-cells.

Main Methods:

• Studied 102 human pancreas transplant recipients and controls.
• Measured acute insulin response to glucose (AIR(gluc)) and arginine (AIR(arg)).
• Assessed fasting plasma glucose (FPG) and glucose potentiation of arginine-induced insulin secretion (GPAIS).

Main Results:

• The reciprocal relationship between AIR(gluc) and FPG is maintained.
• AIR(arg) persists after AIR(gluc) diminishes as FPG rises.
• AIR(arg) and AIR(gluc) predict beta-cell mass and insulin secretory reserve.
• Successful recipients show long-term (up to 22 years) but declining beta-cell function.

Conclusions:

• Pancreas transplantation maintains glucose-insulin homeostasis despite systemic drainage.
• Arginine response is a valuable indicator of beta-cell function and reserve.
• Longitudinal studies reveal time-dependent declines in beta-cell function even in successful grafts.