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2016 ; 113
(18
): 5065-70
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Canonical NF-?B signaling is uniquely required for the long-term persistence of
functional mature B cells
#MMPMID27099294
Derudder E
; Herzog S
; Labi V
; Yasuda T
; Köchert K
; Janz M
; Villunger A
; Schmidt-Supprian M
; Rajewsky K
Proc Natl Acad Sci U S A
2016[May]; 113
(18
): 5065-70
PMID27099294
show ga
Although canonical NF-?B signaling is crucial to generate a normal mature B-cell
compartment, its role in the persistence of resting mature B cells is
controversial. To resolve this conflict, we ablated NF-?B essential modulator
(NEMO) and I?B kinase 2 (IKK2), two essential mediators of the canonical pathway,
either early on in B-cell development or specifically in mature B cells. Early
ablation severely inhibited the generation of all mature B-cell subsets, but
follicular B-cell numbers could be largely rescued by ectopic expression of
B-cell lymphoma 2 (Bcl2), despite a persisting block at the transitional stage.
Marginal zone (MZ) B and B1 cells were not rescued, indicating a possible role of
canonical NF-?B signals beyond the control of cell survival in these subsets.
When canonical NF-?B signaling was ablated specifically in mature B cells, the
differentiation and/or persistence of MZ B cells was still abrogated, but
follicular B-cell numbers were only mildly affected. However, the mutant cells
exhibited increased turnover as well as functional deficiencies upon activation,
suggesting that canonical NF-?B signals contribute to their long-term persistence
and functional fitness.