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A synthetic stroma-free germinal center niche for efficient generation of humoral immunity ex vivo.

Abstract：

:B cells play a major role in the adaptive immune response by producing antigen-specific antibodies against pathogens and imparting immunological memory. Following infection or vaccination, antibody-secreting B cells and memory B cells are generated in specialized regions of lymph nodes and spleens, called germinal centers. Here, we report a fully synthetic ex-vivo system that recapitulates the generation of antigen-specific germinal-center (GC) like B cells using material-surface driven polyvalent signaling. This synthetic germinal center (sGC) reaction was effectively induced using biomaterial-based artificial "follicular T helper cells (TFH)" that provided both natural CD40-CD40L ligation as well as crosslinking of CD40 and by mimicking artificial "follicular dendritic cells (FDC)" to provide efficient, polyvalent antigen presentation. The artificial sGC reaction resulted in efficient B cell expansion, immunoglobulin (Ig) class switching, and expression of germinal center phenotypes. Antigen presentation during sGC reaction selectively enhanced the antigen-specific B cell population and induced somatic hyper-mutations for potential affinity maturation. The resulting B cell population consisted primarily of GC-like B cells (centrocytes) as well as some plasma-like B cells expressing CD138. With concurrent cell sorting, we successfully created highly enriched populations of antigen-specific B cells. Adoptive transfer of these GC-like B cells into non-irradiated isogeneic or non-lethally irradiated congenic recipient mice showed successful engraftment and survival of the donor cells for the 4 week test period. We show that this material-surface driven sGC reaction can be successfully applied to not only splenic B cells but also B cells isolated from more therapeutically relevant sources such as peripheral blood mononuclear cells (PBMCs), thus making our current work an exciting prospect in the new era of personalized medicine and custom-immunotherapy.

journal_name

Biomaterials

journal_title

Biomaterials

authors

Roh KH,Song HW,Pradhan P,Bai K,Bohannon CD,Dale G,Leleux J,Jacob J,Roy K

doi

10.1016/j.biomaterials.2018.02.039

subject

Has Abstract

pub_date

2018-05-01 00:00:00

pages

106-120

eissn

0142-9612

issn

1878-5905

pii

S0142-9612(18)30133-9

journal_volume

164

pub_type

杂志文章

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