Characterization of HLA class I specific antibodies by ELISA using solubilized antigen targets: I. Evaluation of the GTI QuikID assay and analysis of antibody patterns.

Abstract:

:The development of solid phase immunoassays using solubilized HLA molecules as targets has provided a means of detecting HLA-specific antibodies that overcomes many of the shortcomings of lymphocyte based assays. We have evaluated a commercially available assay, the GTI QuikID (QID), that uses solubilized class I molecules from 40 subjects selected for their HLA phenotype, to characterize HLA-specific antibodies. We tested 595 sera from 319 subjects and compared the results obtained with QID to those obtained with cytotoxicity (CYT) and with GTI QuikScreen (QS) as well as to historic data. The correlation of QID with CYT (r = 0.54) was comparable to that between QID and QS (r = 0.60). The majority of disparities between QS and QID were apparent false negatives with QID that could be overcome by analyzing QID data at lower cutoff values. In contrast, most of the disparities between QID and CYT were false negatives in CYT due to the relatively low sensitivity of that assay. As expected, the ELISA was more sensitive (97%) than CYT (78%) but had a somewhat lower specificity (87% vs. 92%) due, most likely, to selection of sera that excluded most sera that were known to be nonspecific by CYT. Determination of antibody specificity could be achieved quickly by manual analysis of the QID data because of the way the data are presented by the manufacturer's software. Interestingly, the frequencies of different antibodies detected by ELISA differed from those detected by CYT with ELISA identifying more sera containing antibodies to both A and B locus antigens.

journal_name

Hum Immunol

journal_title

Human immunology

authors

Zachary AA,Delaney NL,Lucas DP,Leffell MS

doi

10.1016/s0198-8859(00)00254-8

subject

Has Abstract

pub_date

2001-03-01 00:00:00

pages

228-35

issue

3

eissn

0198-8859

issn

1879-1166

pii

S0198-8859(00)00254-8

journal_volume

62

pub_type

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