Abstract:
:Activation of phosphoinositide 3-kinase (PI3K) signaling plays a central role in regulating proliferation and survival of B cells. Here, we tested the hypothesis that B cell receptor (BCR)-mediated activation of PI3K induces the terminal differentiation factor Blimp-1 that interferes with proliferation and survival, thereby controlling the expansion of activated B cells. In fact, B-cell-specific inactivation of Pten, the negative regulator of PI3K signaling, leads to deregulated PI3K activity and elevated Blimp-1 expression. Combined deficiency for Pten and Blimp-1 results in abnormal expansion of B-1 B cells and splenomegaly. Interestingly, Blimp-1 also acts at early stages of B cell development to regulate B cell selection, as Blimp-1 deficiency results in an increased proportion of autoreactive B cells. Together, our data suggest that the combined requirement of deregulated PI3K signaling in addition to defective terminal differentiation represents the basis for proper selection and expansion of developing B cells.
journal_name
Cell Repjournal_title
Cell reportsauthors
Setz CS,Hug E,Khadour A,Abdelrasoul H,Bilal M,Hobeika E,Jumaa Hdoi
10.1016/j.celrep.2018.06.035subject
Has Abstractpub_date
2018-07-10 00:00:00pages
391-405issue
2issn
2211-1247pii
S2211-1247(18)30945-8journal_volume
24pub_type
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