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Related Experiment Videos

Peritubular capillary C4d deposition in chronic allograft dysfunction.

Hyeon Joo Jeong1, Se Hoon Kim, Yu Seun Kim

  • 1Department of Pathology, Yonsei University College of Medicine, 134 Shinchon- dong, Seodaemun-gu, Seoul 120-752, Korea. jeong10@yumc.yonsei.ac.kr

Yonsei Medical Journal
|October 30, 2004
PubMed
Summary

Peritubular capillary (PTC) C4d staining indicates acute humoral rejection. In patients with chronic allograft dysfunction, C4d positivity was linked to late acute rejection, not chronic rejection, and showed reduced graft survival.

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Area of Science:

  • Nephrology
  • Immunology
  • Transplantation

Background:

  • Peritubular capillary (PTC) C4d staining is a known marker for acute humoral rejection.
  • The significance of positive C4d staining in the context of chronic allograft dysfunction remains under-investigated.

Purpose of the Study:

  • To investigate the impact of peritubular capillary (PTC) C4d staining on chronic allograft dysfunction.
  • To determine the association between C4d positivity and the prevalence of acute and chronic rejection in patients with established chronic allograft dysfunction.

Main Methods:

  • Analysis of 93 renal allograft biopsies obtained at least 6 months post-transplantation.
  • Immunohistochemical staining using a monoclonal antibody against C4d.
  • Correlation of C4d staining results with histological findings of acute and chronic rejection and graft survival rates.

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Main Results:

  • C4d staining was detected in 17.2% (16/93) of biopsies.
  • C4d positivity was associated with a higher proportion of acute rejection (40%) compared to C4d-negative cases (21%).
  • No significant difference in the prevalence of chronic rejection or histological injury scores (tubulitis, interstitial inflammation, fibrosis) was observed between C4d-positive and C4d-negative groups.
  • The 2-year graft survival rate after biopsy was significantly lower in the C4d-positive group (24.8%) compared to the C4d-negative group (59.0%).

Conclusions:

  • C4d staining in peritubular capillaries is associated with late acute rejection in patients with chronic allograft dysfunction.
  • C4d staining does not appear to be indicative of chronic rejection based on conventional morphologic criteria.
  • Positive C4d staining in this context is linked to poorer long-term graft survival, suggesting its prognostic value beyond acute rejection.