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Long-term duct-occluded segmental pancreatic autografts: absence of microvascular diabetic complications
W J Hawthorne1, T G Wilson, P Williamson
1Department of Immunology, Westmead Hospital, New South Wales, Australia.
Background:
Current insulin therapies for control of glucose metabolism in patients with type I diabetes mellitus prevent major metabolic consequences of insulin deficiency, but none prevents or arrests long-term complications. In experimental models of canine diabetes, retinopathy, neuropathy, and nephropathy have been shown to develop within 5 years. The aim of this study was to determine in a canine model whether glucose control provided by segmental duct-occluded pancreas autografts could prevent the long-term complications of diabetes.
Methods:
Thirty-five outbred mongrel dogs underwent segmental pancreas autotransplantation with residual pancreatectomy. Follow-up over 5 years included endocrine, retinal fundus photography, fluorescein angiography, and nerve conduction studies. At endpoint, analysis of organ specific changes was undertaken.
Results:
Long-term survival was achieved in 14 dogs for 4 to 5 years and in 3 dogs for 3 to 5 years. Glycosylated hemoglobin levels remained within normal limits, although response to glucose challenge was suboptimal. Fundus photography and fluorescein angiography demonstrated the absence of retinal vascular aneurisms, capillary leakage, and obliteration. Retinal digest showed no vascular changes and normal endothelial/pericyte ratios. Nerve conduction was normal, and histology of nerves revealed normal density of myelinated fibers and absence of intrafascicular vessels and glycogen deposits, with no change in spectrum of fiber diameters and ovoids. Renal histology revealed no evidence of nephropathy with normal glomerular basement membranes.
Conclusions:
We have demonstrated that duct-occluded segmental pancreatic autografts are capable of providing satisfactory metabolic control for up to 5 years, thereby preventing development of the long-term microvascular complications of diabetes.
Insights
Segmental pancreas autografts in dogs with diabetes provided good glucose control for five years, preventing long-term microvascular complications like retinopathy and nephropathy.
Area of Science:
- Endocrinology
- Diabetology
- Surgical Innovation
Background:
- Current insulin therapies for type 1 diabetes mellitus manage metabolic control but do not prevent long-term complications.
- Experimental models show diabetes complications like retinopathy, neuropathy, and nephropathy can develop within 5 years.
Purpose of the Study:
- To evaluate if glucose control via segmental duct-occluded pancreas autografts can prevent long-term diabetes complications in a canine model.
- Assess the efficacy of pancreas autotransplantation in mitigating diabetic microvascular damage.
Main Methods:
- Thirty-five dogs underwent segmental pancreas autotransplantation with residual pancreatectomy.
- A 5-year follow-up included endocrine assessments, retinal imaging (fundus photography, fluorescein angiography), and nerve conduction studies.
- Organ-specific changes were analyzed at the study's end.
Main Results:
- Satisfactory metabolic control was achieved, with glycosylated hemoglobin levels within normal limits.
- Retinal examinations showed no vascular abnormalities (aneurysms, leakage, obliteration).
- Nerve conduction studies and renal histology indicated an absence of diabetic neuropathy and nephropathy.
Conclusions:
- Duct-occluded segmental pancreatic autografts provide effective metabolic control for up to 5 years.
- This approach successfully prevents the development of long-term microvascular complications associated with diabetes.