ArticleCell reports. Medicine2026
ABO: A 3D stroma-supported culture platform enabling full human B-lymphopoiesis for disease modeling and gene therapy development.
Article in Cell reports. Medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Defective B cell development underlies a large proportion of inborn errors of immunity. Progress in understanding disease mechanisms and therapy development remains limited because current human in vitro models incompletely recapitulate B-lymphopoiesis. We present a three-dimensional aggregate culture platform composed of human hematopoietic stem and progenitor cells (HSPCs) and mouse bone marrow (BM) stromal cells as an assay for efficient B cell output (ABO). ABOs support progression through pro-B, pre-B, immature, and transitional B cell stages, with a transcriptional profile and B cell receptor (BCR) repertoire diversity resembling human B cell ontogeny. ABO-derived B cells exhibit functional BCR signaling and differentiate into class-switched memory B cells and antibody-secreting cells following CD40-mediated stimulation. ABOs reproduce the B cell developmental arrest observed in HSPCs from patients with RAG1-deficient severe combined immunodeficiency (SCID), which is corrected by a RAG1 gene therapy lentiviral vector. Thus, ABOs provide a clinically relevant platform for modeling B cell immunodeficiencies and evaluating therapeutic strategies.
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