The analysis of anti-major histocompatibility complex class Ⅰ-related chain A(MICA) specific antibodies testing results in multicenter and its clinical applications / 中华器官移植杂志

ABSTRACT

Objective To research the consistency of testing results with three different antimajor histocompatibility complex class Ⅰ-related chain A(MICA) specific antibody reagents in order to evaluate their clinical application's value.Method An collaborative study of 18 laboratories was undertaken at the 16th International HLA and Irnmunogenetics Workshop.Total of 16 sera(4 batchs)were tested for anti-MICA antibodies by Luminex method with three different reagents (Kit-A,-B and -C).Result Anti-MICA antibodies were found in 15 sera,except one sera(no.S04) ; No.S10 sera showed positive results in all the laboratories.The anti-MICA antibodies were divided into MICA-G1 group (MICA01,02,07,12,17 and 18) and MICA-G2 group (MICA 04,06,08/27,09 and 19).MICA-G1 group specific antibodies were detected in 5 sera with Kit-A and-B reagent; but there were false-positive results of anti-MICA08/27 and MICA19 antibodies in this 5 sera with Kit-C.MICA-G2group specific antibodies can be detected in other 5 sera with Kit-A and-B,But the MICA specific antibodies testing gave different results with Kit-A,-B and-C in all the last 5 sera samples.Testing of MICA08/27 showed highest consistency results (86.67％,13/15) with Kit-A,-B and-C; and testing of MICA19 showed lowest consistency results (40％,6/15) with this 3 reagents.There were 80％ consistency results of anti-MICA specific antibodies in 13 sera with Kit-B.Conclusion There are the same effect to judgment positive or negative result for anti-MICA antibodies with 3 different reagents,but the results of anti-MICA specific antibodies are not the same.Therefore,it's better to use two or more reagents to test anti-MICA specific antibodies,or choose reagent with wide detection range.