Long-term hormonal secretion from the autotransplanted sheep pancreas

Area of Science:

• Endocrinology
• Surgical Research
• Transplantation Biology

Background:

• Pancreatic transplantation is a critical treatment for type 1 diabetes.
• Understanding long-term graft survival and function is essential.
• Non-immunological factors significantly impact endocrine graft survival.

Purpose of the Study:

• To evaluate the long-term viability and function of duct-ligated pancreatic autotransplants.
• To establish a sheep model for studying pancreatic endocrine function and transplant survival.
• To investigate non-immunological factors affecting pancreatic graft endocrine function.

Main Methods:

• Seventy-five duct-ligated pancreatic segmental autotransplants were performed in merino ewes.
• Vascular anastomosis was established to the carotid artery and jugular vein.
• Hormone secretion rates (insulin and glucagon) were assessed post-transplantation.

Main Results:

• Thirty-seven of seventy-five autotransplants were active hormone secretors at one month.
• Twelve grafts remained active at one year, five at two years, and four at three years.
• Initial insulin secretion averaged 12.3 mU/min and glucagon 52.6 ng/min.

Conclusions:

• Pancreatic segmental autotransplants can achieve relatively long-term endocrine function in sheep.
• This model is valuable for studying pancreatic physiology and non-immunological factors in transplantation.
• The findings support the potential for sustained endocrine graft survival beyond conventional expectations.