Abstract:
:By genetically ablating IkappaB kinase (IKK)-mediated activation of the transcription factor NF-kappaB in the B cell lineage and by analyzing a mouse mutant in which immunoglobulin lambda-chain-positive B cells are generated in the absence of rearrangements in the locus encoding immunoglobulin kappa-chain, we define here two distinct, consecutive phases of early B cell development that differ in their dependence on IKK-mediated NF-kappaB signaling. During the first phase, in which NF-kappaB signaling is dispensable, predominantly kappa-chain-positive B cells are generated, which undergo efficient receptor editing. In the second phase, predominantly lambda-chain-positive B cells are generated whose development is ontogenetically timed to occur after rearrangements of the locus encoding kappa-chain. This second phase of development is dependent on NF-kappaB signals, which can be substituted by transgenic expression of the prosurvival factor Bcl-2.
journal_name
Nat Immunoljournal_title
Nature immunologyauthors
Derudder E,Cadera EJ,Vahl JC,Wang J,Fox CJ,Zha S,van Loo G,Pasparakis M,Schlissel MS,Schmidt-Supprian M,Rajewsky Kdoi
10.1038/ni.1732subject
Has Abstractpub_date
2009-06-01 00:00:00pages
647-54issue
6eissn
1529-2908issn
1529-2916pii
ni.1732journal_volume
10pub_type
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