A B-cell subset uniquely responsive to innate stimuli accumulates in aged mice

We have discovered a distinct mature B-cell subset that accumulates with age, which we have termed age-associated B cells. These cells comprise up to 30% of mature B cells by 22 months. Despite sharing some features with other mature B-cell subsets, they are refractory to BCR and CD40 stimulation. I...

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Vydáno v:Blood Ročník 118; číslo 5; s. 1294
Hlavní autoři: Hao, Yi, O'Neill, Patrick, Naradikian, Martin S, Scholz, Jean L, Cancro, Michael P
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States 04.08.2011
Témata:
Aging - immunology
Animals
B-Cell Activating Factor - metabolism
B-Lymphocyte Subsets - cytology
B-Lymphocyte Subsets - immunology
B-Lymphocyte Subsets - metabolism
B-Lymphocyte Subsets - physiology
Cell Proliferation
Cells, Cultured
Female
Immunity, Innate - immunology
Immunity, Innate - physiology
Lymphocyte Activation - immunology
Lymphocyte Activation - physiology
Lymphocyte Count
Mice
Mice, Inbred BALB C
Mice, Inbred C57BL
Mice, Inbred DBA
Mice, Transgenic
ISSN:1528-0020, 1528-0020
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Shrnutí:We have discovered a distinct mature B-cell subset that accumulates with age, which we have termed age-associated B cells. These cells comprise up to 30% of mature B cells by 22 months. Despite sharing some features with other mature B-cell subsets, they are refractory to BCR and CD40 stimulation. Instead, they respond to TLR9 or TLR7 stimulation and divide maximally on combined BCR and TLR ligation, leading to Ig production and preferential secretion of IL-10 and IL-4. Although similar to follicular B cells in both B-lymphocyte stimulator (BLyS) receptor expression and BLyS binding capacity, these cells do not rely on BLyS for survival. They are neither cycling nor the result of intrinsically altered B lymphopoiesis in aged BM, but instead appear to be generated from mature B cells that exhaustively expand during the individual's lifetime. Finally, they present Ag effectively and favor polarization to a TH17 profile. Together, these findings reveal that while the magnitude of the mature primary B-cell niche is maintained with age, it is increasingly occupied by cells refractory to BCR-driven activation yet responsive to innate receptor stimulation.
Bibliografie:ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:1528-0020
1528-0020
DOI:10.1182/blood-2011-01-330530