Abstract:
:The phosphatidylinositol 3-kinase (PI3K) signaling cascade downstream of the B cell receptor (BCR) signalosome is essential for B cell maturation. Proper signaling strength is maintained through the PI3K negative regulator phosphatase and tensin homolog (PTEN). Although a role for microRNA (miRNA)-dependent control of the PTEN-PI3K axis has been described, the contribution of individual miRNAs to the regulation of this crucial signaling modality in mature B lymphocytes remains to be elucidated. Our analyses reveal that ablation of miR-29 specifically in B lymphocytes results in an increase in PTEN expression and dampening of the PI3K pathway in mature B cells. This dysregulation has a profound impact on the survival of B lymphocytes and results in increased class switch recombination and decreased plasma cell differentiation. Furthermore, we demonstrate that ablation of one copy of Pten is sufficient to ameliorate the phenotypes associated with miR-29 loss. Our data suggest a critical role for the miR-29-PTEN-PI3K regulatory axis in mature B lymphocytes.
journal_name
Cell Repjournal_title
Cell reportsauthors
Hines MJ,Coffre M,Mudianto T,Panduro M,Wigton EJ,Tegla C,Osorio-Vasquez V,Kageyama R,Benhamou D,Perez O,Bajwa S,McManus MT,Ansel KM,Melamed D,Koralov SBdoi
10.1016/j.celrep.2020.108436subject
Has Abstractpub_date
2020-12-01 00:00:00pages
108436issue
9issn
2211-1247pii
S2211-1247(20)31425-Xjournal_volume
33pub_type
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