Significance and Implications of Capillaritis during Acute Rejection of Kidney Allografts

Fernando G. Cosio, Donna J. Lager, Elizabeth C. Lorenz, Hatem Amer, James M. Gloor, Mark D. Stegall

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

BACKGROUND: Anti-human leukocyte antigen antibodies (a-HLA) cause graft injury identified by C4d in peritubular capillaries. We investigated whether a-HLA relate to episodes of C4d negative acute rejection (AR). METHODS: We analyzed 878 kidney recipients transplanted from January 2000 to December 2006. Pretransplant, 36% of these crossmatch negative recipients had a-HLA measured by solid phase assays. RESULTS: AR occurred in 154 patients (18%) and 11 of them (9.4%) were C4d+. Forty-six percent of ARs were diagnosed by protocol biopsy. The risk of C4d-AR was increased in patients with a-HLA class I with donor specificity (DSA-I) (hazard ratio=1.519; confidence interval, 1.02-2.26; P=0.039). DSA-II were not associated with an increased risk of C4d-AR. The relationship between DSA-I and C4d-AR was independent of recipient age, BK nephropathy, and HLA mismatches. Compared with DSA-, in DSA+ recipients C4d-AR were most often histologically "borderline." DSA+ was associated with capillaritis in the biopsy (glomerulitis, 6.1% vs. 32%, P=0.003; peritubular capillaritis: 13% vs. 40%, P=0.0009). Compared with no AR, C4d-AR with capillaritis was associated with reduced graft survival (hazard ratio=4.164; confidence interval, 1.763-9.832; P=0.001), independent of other variables. This association was observed even in the cases of borderline AR. CONCLUSIONS: DSA-I increases the risk of C4d-AR. The presence of DSA-I or II is associated with capillaritis during AR. Capillaritis is associated with reduced graft survival.

Original languageEnglish (US)
Pages (from-to)1088-1094
Number of pages7
JournalTransplantation
Volume89
Issue number9
DOIs
StatePublished - May 1 2010

Keywords

  • Acute rejection
  • Anti-HLA antibodies
  • C4d
  • Capillaritis
  • Humoral rejection

ASJC Scopus subject areas

  • Transplantation

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