Immunohistochemical evidence of activated lectin pathway in kidney allografts with peritubular capillary C4d deposition

Nephrology, Dialysis, Transplantation : Official Publication of the European Dialysis and Transplant Association - European Renal Association
Naofumi ImaiFumitake Gejyo

Abstract

Complement 4d (C4d) deposition in the peritubular capillary (PTC) in the kidney allograft is a useful diagnostic marker for humoral rejection. C4d is produced not only by the classical pathway but also by the lectin pathway of the complement activation cascade. We have recently reported the in situ role of the later phase of the complement cascade in renal allografts with C4d deposition; however, the initial process prior to C4d deposition is yet to be resolved. To clarify the early phases of the complement activation cascade, we evaluated the deposition of initial proteins of the above two pathways; IgG, IgM, mannose-binding lectin (MBL), H-ficolin, L-ficolin, MBL-associated serine protease (MASP)-1 and MASP-2 in kidney allografts with PTC C4d deposition. Sixty kidney allograft specimens were divided into two groups on the basis of the presence of C4d deposition in PTC. The C4d-positive group (n = 18) included nine ABO-identical and nine ABO-incompatible cases, and the C4d-negative group (n = 42) had 34 ABO-identical and eight ABO-compatible (but not identical) cases. In the C4d-positive group, 16 of 18 cases showed diffuse H-ficolin and IgM deposition in PTC. In contrast, H-ficolin and IgM were not detected in PTC in the C4d-...Continue Reading

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