Islet transplantation tolerance in animals with defined histocompatibility and diabetes
Bhagchandani, P.; Chang, C.; Zhao, W.; Ghila, L.; Herrera, P. L.; Chera, S.; Kim, S. K.
Show abstract
Advances in organ transplantation benefit from development of genetically inbred animal strains with defined histocompatibility and cell-specific markers to distinguish donor and host cell subsets. For studies of pancreatic islet transplantation tolerance in diabetes, an invariant method to ablate host {beta} cells and induce diabetes would provide an immense additional advantage. Here we detail development and use of B6 RIP-DTR mice, an immunocompetent line permitting diabetes induction with 100% penetrance. This inbred line is homozygous for the C57BL/6J major histocompatibility complex (MHC) haplotype and expresses the mutant CD45.1 allele in the hematopoietic lineage. {beta} cell-specific expression of a high-affinity receptor for diphtheria toxin (DT) permits experimental {beta} cell ablation and diabetes induction after DT administration. Diabetes reversal for over one year was achieved after transplantation with congenic C57BL/6J islets, but not with MHC-mismatched BALB/c islets, which were rapidly rejected. In summary, the generation of a C57BL/6J congenic line harboring the CD45.1 allele and Ins2-HBEGF transgene should advance studies of islet transplantation tolerance and mechanisms to improve islet engraftment and function, thereby optimizing development of cell replacement strategies for diabetes mellitus.
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