Diabetes, Vol 39, Issue 4 519-522, Copyright © 1990 by American Diabetes Association
Reversal of diabetes in BB rats by transplantation of encapsulated pancreatic islets
MY Fan, ZP Lum, XW Fu, L Levesque, IT Tai and AM Sun
University of Toronto, Department of Physiology, Ontario, Canada.
Prolonged survival of pancreatic islet allografts implanted in diabetic BB
rats was achieved by encapsulation of individual islets in a protective
biocompatible alginate-polylysine-alginate membrane without
immunosuppression. Intraperitoneal transplantation of the encapsulated
islets reversed the diabetic state of the recipients within 3 days and
maintained normoglycemia for 190 days. Normal body weight and urine volume
were maintained during this period, and no cataracts were detected in the
transplant recipients. In contrast, control rats receiving transplants of
unencapsulated islets experienced normoglycemia for less than 2 wk. These
results demonstrated that microencapsulation can protect allografted islets
from both graft rejection and autoimmune destruction without
immunosuppression in an animal model that mimics human insulin-dependent
diabetes.