Hematopoietic stem cell-independent B-1a lineage.

Abstract:

:The accepted dogma has been that a single long-term hematopoietic stem cell (LT-HSC) can reconstitute all components of the immune system. However, our single-cell transfer studies have shown that highly purified LT-HSCs selectively fail to reconstitute B-1a cells in otherwise fully reconstituted hosts (i.e., LT-HSCs fully reconstitute follicular, marginal zone, and B-1b B cells, but not B-1a cells). These results suggest that B-1a cells are a separate B cell lineage that develops independently of classical LT-HSCs. We provide an evolutionary two-pathway development model (HSC independent versus HSC dependent), and suggest that this lineage separation is employed not only by B cells but by all hematopoietic lineages. Collectively, these findings challenge the current notion that LT-HSCs can reconstitute all components of the immune system and raise key questions about human HSC transplantation. We discuss the implications of these findings in light of our recent studies demonstrating the ability of B-1a cells to elicit antigen-specific responses that differ markedly from those mounted by follicular B cells. These findings have implications for vaccine development, in particular vaccines that may elicit the B-1a repertoire.

journal_name

Ann N Y Acad Sci

authors

Ghosn EE,Yang Y

doi

10.1111/nyas.12881

subject

Has Abstract

pub_date

2015-12-01 00:00:00

pages

23-38

eissn

0077-8923

issn

1749-6632

journal_volume

1362

pub_type

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