Abstract
Background
Angiotensin II type 1 receptor antibodies (AT1R-Abs) have been implicated in renal transplant rejection and failure; however, the mechanism of allograft damage, patterns of clinical presentation, and response to desensitization of AT1R-Abs have not been clearly established.
Case diagnosis/treatment
We present the case of a 7-year-old boy with preformed AT1R-Abs who developed accelerated vascular and cellular rejection and renal allograft thrombosis despite desensitization and treatment with angiotensin receptor blockade. Although an association between AT1R-Abs and microvascular occlusion has been previously described, we are the first to describe an association between AT1R-Abs and renal artery thrombosis, leading to devastating early allograft failure.
Conclusions
This case highlights the risk of allograft thrombosis associated with AT1R-Abs and illustrates that previous treatments utilized for AT1R-Abs may not always be effective. Further studies are needed to better characterize the mechanisms of AT1R-Ab pathogenesis and to establish safe levels of AT1R-Abs both pre- and post-transplantation. Given the outcome of this patient and the evidence of pro-coagulatory effects of AT1R-Abs, we suggest that the presence of AT1R-Ab may be a risk factor for thrombosis. The role of treatment with anti-coagulation and novel immunomodulatory agents such as tocilizumab and bortezomib require further investigation.
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Acknowledgments
We would like to thank the Casey Lee Ball Foundation and the UCLA Children’s Discovery and Innovation (CDI) and Today and Tomorrow’s Children Fund (TTCF) for supporting this work.
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The authors declare that they have no conflicts of interest.
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Pearl, M.H., Leuchter, R.K., Reed, E.F. et al. Accelerated rejection, thrombosis, and graft failure with angiotensin II type 1 receptor antibodies. Pediatr Nephrol 30, 1371–1374 (2015). https://doi.org/10.1007/s00467-015-3123-5
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DOI: https://doi.org/10.1007/s00467-015-3123-5