Abstract
Background
Minimal Change Disease (MCD) in relapse is associated with increased podocyte CD80 expression and elevated urinary CD80 excretion, whereas focal segmental glomerulosclerosis (FSGS) has mild or absent CD80 podocyte expression and normal urinary CD80 excretion.
Methods
One patient with MCD, one patient with primary FSGS and three patients with recurrent FSGS after transplantation received CD80 blocking antibodies (abatacept or belatacept). Urinary CD80 and CTLA-4 levels were measured by ELISA. Glomeruli were stained for CD80.
Results
After abatacept therapy, urinary CD80 became undetectable with a concomitant transient resolution of proteinuria in the MCD patient. In contrast, proteinuria remained unchanged after abatacept or belatacept therapy in the one patient with primary FSGS and in two of the three patients with recurrent FSGS despite the presence of mild CD80 glomerular expression but normal urinary CD80 excretion. The third patient with recurrent FSGS after transplantation had elevated urinary CD80 excretion immediately after surgery which fell spontaneously before the initiation of abatacept therapy; after abatacept therapy, his proteinuria remained unchanged for 5 days despite normal urinary CD80 excretion.
Conclusion
These observations are consistent with a role of podocyte CD80 in the development of proteinuria in MCD. In contrast, CD80 may not play a role in recurrent FSGS since the urinary CD80 of our three patients with recurrent FSGS was only increased transiently after surgery and normalization of urinary CD80 did not result in resolution of proteinuria.
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Support
This study was supported by NIH R01DK080764 to EHG. and RJJ and in part by grants from the National Institutes of Health DK073495 and DK089394 to RJJ. JR is supported by grants from the National Institute of Health (DK073495, DK089394 and DK101350).
Financial disclosures
Jochen Reiser has pending or issued patents in the area of novel therapeutics for renal diseases. He stands to gain royalties from their future commercialization.
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Garin, E.H., Reiser, J., Cara-Fuentes, G. et al. Case series: CTLA4-IgG1 therapy in minimal change disease and focal segmental glomerulosclerosis. Pediatr Nephrol 30, 469–477 (2015). https://doi.org/10.1007/s00467-014-2957-6
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DOI: https://doi.org/10.1007/s00467-014-2957-6