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Generation of inhibitory antibodies upon repeated FVIII infusion represents a major complication in hemophilia care. Professional antigen presenting cells (APCs) are crucial for orchestration of humoral immune responses. APCs are capable of internalizing soluble as well as particulate antigens through various mechanisms resulting in loading of antigen-derived peptides on MHC class I or II for presentation to T cells. This review highlights how FVIII is recognized and processed by APCs. The significance and contribution of candidate receptors involved in FVIII uptake by APC are discussed. Recent findings defining the repertoire of FVIII peptides presented on MHC class II are addressed. Studies in murine models of hemophilia A suggest that modulation of APC function can reduce inhibitor formation. Based on this we anticipate that modulation of FVIII uptake by APCs may yield novel therapeutic approaches for treatment or prevention of inhibitor formation in patients with hemophilia A. Copyright © 2011 Elsevier Ltd. All rights reserved.


Simon D van Haren, Aleksandra Wroblewska, Kathelijn Fischer, Jan Voorberg, Eszter Herczenik. Requirements for immune recognition and processing of factor VIII by antigen-presenting cells. Blood reviews. 2012 Jan;26(1):43-9

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PMID: 22036515

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