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Kidins220/ARMS binds to the B cell antigen receptor and regulates B cell development and activation.

J. Exp. Med.2015 Sep 21;212(10):1693-708. Epub 2015 Aug 31
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摘要


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 PLCγ2, 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, λ light chain-positive B cells were reduced sixfold in the B-KO mice, genetically placing Kidins220 in the PLCγ2 pathway. Thus, our data indicate that Kidins220 positively regulates pre-BCR and BCR functioning.

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