Immune Complex-Type Deposits in the Fischer-344 to Lewis Rat Model of Renal Transplantation and a Subset of Human Transplant Glomerulopathy

Transplantation
Veronika GrauJan Ulrich Becker

Abstract

Antibody-mediated rejection is a leading cause for renal transplant loss. Rodent models are useful to dissect pathomechanisms and to develop treatment strategies. Although used for decades as a model, glomerular histopathological findings of Fischer-344 kidneys transplanted into Lewis rats have never been comprehensively described. Kidneys from Fischer-344 rats were transplanted into Lewis rats as life-sustaining allografts without immunosuppression. Lewis isografts and normal Fischer-344 kidneys served as controls. Grafts were harvested at 9 days, 6 and 26 weeks. Histopathological examination included light microscopy, immunohistochemistry, and morphometry. Findings were compared with 51 human biopsies with transplant glomerulopathy. Most glomerular findings in rat allografts resembled human acute and chronic antibody-mediated rejection with glomerulitis, microthrombosis, microaneurysms, glomerular hypertrophy, podocyte loss, glomerular basement membrane splitting, and secondary focal and segmental glomerulosclerosis. In line with previous reports on nonendothelial antigens, glomerular immunoglobulin and C4d deposition was mostly nonendothelial. Only in 26-week allografts, we found mesangial and subendothelial immune complex-t...Continue Reading

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Citations

May 26, 2016·Pediatric Nephrology : Journal of the International Pediatric Nephrology Association·Jan U Becker
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