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miR-29 Sustains B Cell Survival and Controls Terminal Differentiation via Regulation of PI3K Signaling.

Cell reports (2020-12-03)
Marcus J Hines, Maryaline Coffre, Tenny Mudianto, Marisella Panduro, Eric J Wigton, Cosmin Tegla, Victoria Osorio-Vasquez, Robin Kageyama, David Benhamou, Oriana Perez, Sofia Bajwa, Michael T McManus, K Mark Ansel, Doron Melamed, Sergei B Koralov
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.

MATERIALS
Product Number
Brand
Product Description

Roche
DAPI, 4′,6-Diamidine-2′-phenylindole dihydrochloride
Sigma-Aldrich
4-Nitrophenyl phosphate disodium salt hexahydrate, tablet