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2017 ; 2
(7
): ä Nephropedia Template TP
gab.com Text
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English Wikipedia
Low CD21 expression defines a population of recent germinal center graduates
primed for plasma cell differentiation
#MMPMID28783670
Lau D
; Lan LY
; Andrews SF
; Henry C
; Rojas KT
; Neu KE
; Huang M
; Huang Y
; DeKosky B
; Palm AE
; Ippolito GC
; Georgiou G
; Wilson PC
Sci Immunol
2017[Jan]; 2
(7
): ä PMID28783670
show ga
In this study, we report that antigen-specific CD19(+)CD27(+)CD21(lo) (CD21(lo))
B cells are transiently induced 14 to 28 days after immunization, at the time
germinal centers (GCs) peak. Although clonally related to memory B cells and
plasmablasts, CD21(lo) cells form distinct clades within phylogenetic trees based
on accumulated variable gene mutations, supporting exit from active GCs. CD21(lo)
cells express a transcriptional program, suggesting that they are primed for
plasma cell differentiation and are refractory to GC differentiation, although
they do not spontaneously secrete antibody. In addition, CD21(lo) cells
differentially express multiple cell surface markers and have elevated
intracellular levels of Blimp-1 and T-bet protein compared with memory B cells.
Together, these data support a model in which CD21(lo) cells are recent GC
graduates that represent a distinct population from CD27(+) classical memory
cells, are refractory to GC reentry, and are predisposed to differentiate into
long-lived plasma cells.