Abstract
The etiology and treatment of transplant glomerulopathy (TG) is not clear. TG is associated with donor-specific antibodies but the lack of C4d deposition in the peritubular capillaries (ptc-C4d) in some cases has caused the role of complement in the pathogenesis of TG to be debated. There is however, little information on C4d deposition in the glomerulus itself. We retrieved random frozen sections from 25 cases with well-established TG by light microscopy (LM) and 25 cases without TG as controls and reviewed the LM and immunofluorescence (nine biopsies were excluded due to inadequate samples). Glomerular complement deposition was assessed in all included biopsies. Glomerular C3d and C4d deposition occurred in a distinct pattern in all TG biopsies: segmental or global double linear staining of the glomerular capillary wall in 23 (100%). This pattern was not present in any NON-TG biopsies. The distinct glomerular complement deposition patterns in all TG cases are suggestive that TG is a proximal complement-mediated process and therapies should focus on proximal complement inhibition.
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Abbreviations
- AMR:
-
Antibody mediated rejection
- DSA:
-
Donor specific antibody
- EM:
-
Electron microscopy
- ESRD:
-
End stage renal disease
- GCW:
-
Glomerular capillary wall
- HLA:
-
Human leucocyte antigen
- IF:
-
Immunofluorescence
- LM:
-
Light microscopy
- MPGN:
-
Membranoproliferative glomerulonephritis
- Ptc-C4d:
-
Peritubular capillary C4d
- TG:
-
Transplant glomerulopathy
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Acknowledgements
We sincerely thank Erica Thomas for her tireless work in the IF lab and her thoughtful processing of all samples in above study as well as Sarah Kiminski who aided in data collection.
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PSV participated in concept and research design, writing of the paper, performance of the research and data analysis. RCR participated in research design, performance of the research, approved final version of the paper. LB participated in research design, performance of the research, approved final version of the paper. AJM participated in research design and writing of the paper. YK participated in concept and research design, writing of the paper, performance of the research and data analysis.
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The authors of this manuscript have no conflicts of interest to disclose as described by the Journal of Nephrology.
Research involving human and animal statement
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. For this type of study formal consent is not required. Our study was approved by the University of Minnesota Institutional Review Board.
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Verghese, P.S., Reed, R.C., Lihong, B. et al. The clinical implications of the unique glomerular complement deposition pattern in transplant glomerulopathy. J Nephrol 31, 157–164 (2018). https://doi.org/10.1007/s40620-016-0365-7
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DOI: https://doi.org/10.1007/s40620-016-0365-7