FVIII peptides presented on HLA-DP and identification of an A3 domain peptide binding with high affinity to the commonly expressed HLA-DP4.

IF 8.2 1区 医学 Q1 HEMATOLOGY
Mariarosaria Miranda, Bjarke Endel Hansen, Batoul Wehbi, Valeria Porcheddu, Floris P J Van Alphen, Paul Kaijen, Karin Fijnvandraat, Sebastien Lacroix-Desmazes, Maartje Van den Biggelaar, Bernard Maillere, Jan Voorberg
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引用次数: 0

Abstract

The development of neutralizing antibodies (inhibitors) against coagulation factor VIII (FVIII) poses a major challenge in hemophilia A (HA) treatment. The formation of FVIII inhibitors is a CD4+ T-cell dependent mechanism which includes antigen presenting cells (APCs), B- and T-helper lymphocytes. APCs present FVIII derived peptides on major histocompatibility complex class II (MHC-II) to CD4+ Tcells. We previously established a mass spectrometry based approach to delineate the FVIII repertoire presented on HLA-DR and HLA-DQ. In this study, specific attention was directed towards the identification of FVIII peptides presented on HLA-DP. A data-set of naturally processed FVIII peptides was generated by incubating human FVIII with immature monocytes-derived dendritic cells (moDCs) from HLA-typed healthy donors. Using this method, we identified 176 to 1352 different HLA-DP presented peptides per donor, including 26 different FVIII derived peptides. The most frequently presented peptides derived from the A3, and C2 domains of FVIII. Comparison of the FVIII repertoire presented on HLA-DP with that presented on HLA-DR revealed considerable overlap but also suggested preferential presentation of specific peptides on either HLA-DR or HLA-DP. Fourteen FVIII peptides presented on HLA-DP were synthesized and evaluated for their binding ability to the commonly expressed HLA-DP4 molecule which is highly prevalent in the Caucasian population. Peptide binding studies showed that 7 of 14 peptides competed with a reference peptide to HLADP4. Interestingly, an A3 domain derived peptide bound with high affinity to HLA-DP4 positioning this peptide as a prime candidate for the development of novel peptide-based tolerogenic strategies for FVIII inhibitors.

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来源期刊
Haematologica
Haematologica 医学-血液学
CiteScore
14.10
自引率
2.00%
发文量
349
审稿时长
3-6 weeks
期刊介绍: Haematologica is a journal that publishes articles within the broad field of hematology. It reports on novel findings in basic, clinical, and translational research. Scope: The scope of the journal includes reporting novel research results that: Have a significant impact on understanding normal hematology or the development of hematological diseases. Are likely to bring important changes to the diagnosis or treatment of hematological diseases.
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