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Effect of Different Sensitization Events on HLA Alloimmunization in Kidney Transplantation Candidates.

Abstract：

BACKGROUND:HLA alloimmunization is caused by sensitization events (SEs), such as transfusion, pregnancy, or previous organ transplantation, and the effects of particular SEs have not been thoroughly studied. Our aim was to evaluate how each SE affected HLA alloimmunization by considering Luminex assays. METHODS:Sera from 722 kidney transplantation candidates were screened per protocol by means of Luminex assays to determine the presence of anti-HLA class I/II antibodies; positive sera underwent single-antigen assay to determine the presence of specific antibodies against HLA A, B, C, DR, DQ, DP loci (positivity if median fluorescence intensity values were >1,000). The effect of each SE was analyzed considering only patients exposed to 1 kind of sensitization. RESULTS:In the 453 candidates with ≥1 SE, anti-HLA class I positivity rates were significantly higher in patients with previous transfusion (18.9%; P = .014), pregnancy (38.3%; P < .001) or transplant (75%; P < .001) compared with those with no SE (similar results for class II). The strength (median fluorescence intensity) of specific antibodies was significantly higher in patients with previous transplantation than in those with previous transfusion for HLA-A (8,017 vs 2,302; P = .02), HLA-B (7,765 vs 2,901; P = .018), and HLA-DR (9,835 vs 2,060; P = .003). Other anti-HLA antibody strengths were similar between patients with previous pregnancy or transplantation. CONCLUSIONS:Presence of any SE analyzed was associated with a higher prevalence of anti-HLA antibodies for class I ± II compared with nonsensitized patients. Transplantation had the strongest immunization effect on both classes, followed by pregnancy and then transfusion.

journal_name

Transplant Proc

journal_title

Transplantation proceedings

authors

Lopes D,Barra T,Malheiro J,Tafulo S,Martins L,Almeida M,Pedroso S,Dias L,Castro Henriques A,Cabrita A

doi

10.1016/j.transproceed.2015.03.014

subject

Has Abstract

pub_date

2015-05-01 00:00:00

pages

894-7

issue

4

eissn

0041-1345

issn

1873-2623

pii

S0041-1345(15)00242-0

journal_volume

47

pub_type

杂志文章

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