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2015 ; 212
(10
): 1693-708
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Kidins220/ARMS binds to the B cell antigen receptor and regulates B cell
development and activation
#MMPMID26324445
Fiala GJ
; Janowska I
; Prutek F
; Hobeika E
; Satapathy A
; Sprenger A
; Plum T
; Seidl M
; Dengjel J
; Reth M
; Cesca F
; Brummer T
; Minguet S
; Schamel WW
J Exp Med
2015[Sep]; 212
(10
): 1693-708
PMID26324445
show ga
B cell antigen receptor (BCR) signaling is critical for B cell development and
activation. Using mass spectrometry, we identified a protein kinase D-interacting
substrate of 220 kD (Kidins220)/ankyrin repeat-rich membrane-spanning protein
(ARMS) as a novel interaction partner of resting and stimulated BCR. Upon BCR
stimulation, the interaction increases in a Src kinase-independent manner. By
knocking down Kidins220 in a B cell line and generating a conditional B
cell-specific Kidins220 knockout (B-KO) mouse strain, we show that Kidins220
couples the BCR to PLC?2, Ca(2+), and extracellular signal-regulated kinase (Erk)
signaling. Consequently, BCR-mediated B cell activation was reduced in vitro and
in vivo upon Kidins220 deletion. Furthermore, B cell development was impaired at
stages where pre-BCR or BCR signaling is required. Most strikingly, ? light
chain-positive B cells were reduced sixfold in the B-KO mice, genetically placing
Kidins220 in the PLC?2 pathway. Thus, our data indicate that Kidins220 positively
regulates pre-BCR and BCR functioning.