Abstract:
:Recently, leukaemia-associated antigens (LAA) recognized by T lymphocytes, such as Wilm's tumour-1 (WT-1) or pathogenesis-related protein-1 (PR-1), have been identified. For immunotherapies that employ antigen peptides, either alone or pulsed on dendritic cells (DC), the expression of human leucocyte antigen (HLA) molecules on the targeted leukaemic blasts (LB) is crucial. The co-stimulatory molecules CD80 and CD86 give the secondary signal to T lymphocytes that is necessary for the lysis of leukaemia cells, and CD40 enhances the efficacy of antigen presentation. Here, the expression of HLA-ABC, HLA-A2, HLA-DR, CD40, CD80 and CD86 was flow cytometrically examined in blood samples from 24 healthy volunteers (HV), 24 patients with newly diagnosed acute myeloid leukaemia (AML) and five patients with relapsed AML. The expression of HLA-ABC, CD40, CD80 and CD86 was significantly reduced on LB in comparison with monocytes of HV. HLA-A2 and HLA-DR expression was similar on LB and on monocytes of HV. In AML patients, the expression of HLA and CD86 molecules was significantly higher on LB than on CD33/CD34-negative monocytes. CD40 and CD80 molecules were deficient on AML blasts. The preservation of HLA molecules and CD86 on LB of the majority of AML patients at the time of diagnosis and even at relapse of the disease are prerequisites for LAA-targeted immunotherapies in these patients.
journal_name
Br J Haematoljournal_title
British journal of haematologyauthors
Vollmer M,Li L,Schmitt A,Greiner J,Reinhardt P,Ringhoffer M,Wiesneth M,Döhner H,Schmitt Mdoi
10.1046/j.1365-2141.2003.04212.xsubject
Has Abstractpub_date
2003-03-01 00:00:00pages
1000-8issue
6eissn
0007-1048issn
1365-2141pii
4212journal_volume
120pub_type
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