Human leukocyte antigen class II DQ alpha and beta epitopes identified from sera of kidney allograft recipients.

Abstract:

BACKGROUND:Epitopes are the sites to which antibodies bind. Both alpha and beta peptide chains of the human leukocyte antigen-DQ heterodimers (DQA1 and DQB1, respectively) contain polymorphic regions. We can identify DQA1 and DQB1 epitopes by DQ single antigen beads assay of the antibodies, correlating the beads' reaction patterns with either DQA1 or DQB1 alleles. METHODS:Sera from 74 transplant patients and 35 mouse DQB1 monoclonal antibodies were tested with DQ single antigen beads for their DQ allelic and serological specificities. Epitopes were defined by amino acids shared by the positive antigens of the antibodies. Unique amino acids were identified as potential epitope sites by comparing the peptide sequences of all human leukocyte antigen class II alleles. For the absorption or elution, patient's serum sample was absorbed by a homozygous B-lymphoblast cell line of specific DQ typing, the eluted antibody then tested with single antigen beads to demonstrate that the antibody reacted to a single epitope shared by multiple DQ antigens. RESULTS:Three DQA1 and 15 DQB1 epitopes were identified. We found that 21 patients produced antibodies against one of the DQA1 epitopes; 27 patients produced antibodies against one of the DQB1 epitopes. CONCLUSION:The DQA1 and DQB1 epitopes identified here seem to be immunogenic and to elicit DQ antibodies. For the DQB1 epitopes, multiple DQ serological specificities that were detected in the serum of a transplant patient could be explained as a single donor-specific DQ antibody reacting to a mismatched DQ epitope of the donor. Ten examples are shown here.

journal_name

Transplantation

journal_title

Transplantation

authors

Deng CT,El-Awar N,Ozawa M,Cai J,Lachmann N,Terasaki PI

doi

10.1097/TP.0b013e3181804cd2

subject

Has Abstract

pub_date

2008-08-15 00:00:00

pages

452-9

issue

3

eissn

0041-1337

issn

1534-6080

pii

00007890-200808150-00013

journal_volume

86

pub_type

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