Abstract：
:Heart transplant rejection is routinely defined by histological evaluation of endomyocardial biopsies (EMB). As elevated levels of donor derived sHLA (dsHLA) can be detected in the serum of transplanted patients just before or during rejection, quantification of donor specific soluble counterparts of HLA Class I (sHLA-I) in the serum of the recipient may be a new way for non-invasive monitoring of graft rejection. However, not all patients show an increase of dsHLA at time of rejection. A reason for this might be that anti-donor-HLA antibodies, which are formed by the patient, form complexes with donor sHLA-I molecules. This masking or blocking of sHLA-I binding sites might cause false-negative results of tests detecting donor specific sHLA. Using HLA-antigen specific ELISA tests we could demonstrate that most anti-HLA antibodies block the detection of sHLA antigens in plasma, even in high dilutions of the antibody when the antibodies were not detectable in a CDC test. In general, HLA-antigen specific antibodies block the detection of sHLA molecules, while broadly-reactive antibodies, recognizing another epitope on the molecule, do not. The implication of these findings is that more than one dsHLA allotype within one patient should be tested to monitor graft rejection. In addition, sHLA monitoring must be combined with an HLA-antibody screening.
journal_name
Hum Immunoljournal_title
Human immunologyauthors
Koelman CA,Ensink W,Mulder A,Tanke J,Doxiadis II,Claas FHdoi
10.1016/s0198-8859(99)00010-5subject
Has Abstractpub_date
1999-05-01 00:00:00pages
414-23issue
5eissn
0198-8859issn
1879-1166pii
S0198-8859(99)00010-5journal_volume
60pub_type
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