Abstract:
:Inhibitor formation in patients with haemophilia receiving factor VIII (FVIII) concentrate is a common problem requiring tolerance induction therapy. Immune tolerance is dependent on defective T cell/antigen-presenting cell (APC) interactions and inhibitor antibody formation is associated with effective T-cell/B-cell interaction. We studied the expression of the cell-surface molecules involved with these interactions using multiparameter flow cytometry and a whole blood stimulation assay-phytohaemaglutinin (PHA) to activate T cells and Escherichia coli lipopolysaccharide (LPS) to activate monocytes and B cells. Up-regulation of T-cell co-stimulatory receptors CD11a, CD40 ligand (CD40L) and CTLA4 were inhibited in a dose-dependent manner by plasma-derived (pd)FVIII, but CD28 was unchanged. Up-regulation of monocyte and B-cell co-stimulatory ligands CD4O, B7-1 (CD80) and B7-2 (CD86) were also inhibited in a dose-dependent manner by pdFVIII, but LFA-3 (CD58) was unchanged. The combined inhibitory effect of prednisolone, an immunosuppressive agent used in several tolerance induction protocols, with pdFVIII on co-stimulatory molecules, was additive. There was no significant alteration in T-cell/APC adhesion or co-stimulatory molecules noted in the presence of recombinant (rh)FVIII concentrate. The inhibitory effect of pdFVIII on molecules involved in interaction between T cells and APCs may result in immune tolerance in recipients of pdFVIII concentrate. The inhibitory effect of pdFVIII on CD40/CD40L up-regulation may result in defective antibody formation. We now provide evidence that the use of pdFVIII, through interfering with APC/T-cell interactions, may be more appropriate than rhFVIII for tolerance induction.
journal_name
Br J Haematoljournal_title
British journal of haematologyauthors
Hodge G,Han Pdoi
10.1046/j.1365-2141.2000.01994.xsubject
Has Abstractpub_date
2000-04-01 00:00:00pages
195-200issue
1eissn
0007-1048issn
1365-2141pii
bjh1994journal_volume
109pub_type
杂志文章abstract::Sources for allogeneic stem cells for patients with haematological disorders lacking a histocompatible sibling donor include matched unrelated donor (MUD) and umbilical cord blood (UCB). A total of 51 patients with haematological disorders, treated with myeloablation and transplantation with either unrelated human leu...
journal_title:British journal of haematology
pub_type: 杂志文章
doi:10.1046/j.1365-2141.2003.04792.x
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journal_title:British journal of haematology
pub_type: 杂志文章
doi:10.1111/j.1365-2141.1982.tb03913.x
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abstract::During the administration of recombinant human granulocyte colony-stimulating factor (rhG-CSF) or granulocyte-macrophage CSF (rhGM-CSF) we studied the early and late changes of membrane antigen density on neutrophils. RhG-CSF and rhGM-CSF both caused an early transient reduction in blood neutrophilic granulocyte-conce...
journal_title:British journal of haematology
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doi:10.1111/j.1365-2141.1993.tb08644.x
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abstract::The Australian Leukaemia Study Group has performed a randomized trial of interferon alpha-2A (Roferon-A) as a co-induction agent together with intensive combination chemotherapy and as maintenance following completion of 12 cycles of induction treatment. When used as a co-induction agent, interferon-alpha did not impr...
journal_title:British journal of haematology
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journal_title:British journal of haematology
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journal_title:British journal of haematology
pub_type: 临床试验,杂志文章,多中心研究
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journal_title:British journal of haematology
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journal_title:British journal of haematology
pub_type: 杂志文章
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更新日期:1994-05-01 00:00:00
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journal_title:British journal of haematology
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