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2017 ; 37
(24
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
The mTOR-Bach2 Cascade Controls Cell Cycle and Class Switch Recombination during
B Cell Differentiation
#MMPMID28993481
Tamahara T
; Ochiai K
; Muto A
; Kato Y
; Sax N
; Matsumoto M
; Koseki T
; Igarashi K
Mol Cell Biol
2017[Dec]; 37
(24
): ä PMID28993481
show ga
The transcription factor Bach2 regulates both acquired and innate immunity at
multiple steps, including antibody class switching and regulatory T cell
development in activated B and T cells, respectively. However, little is known
about the molecular mechanisms of Bach2 regulation in response to signaling of
cytokines and antigen. We show here that mammalian target of rapamycin (mTOR)
controls Bach2 along B cell differentiation with two distinct mechanisms in pre-B
cells. First, mTOR complex 1 (mTORC1) inhibited accumulation of Bach2 protein in
nuclei and reduced its stability. Second, mTOR complex 2 (mTORC2) inhibited FoxO1
to reduce Bach2 mRNA expression. Using expression profiling and chromatin
immunoprecipitation assay, the Ccnd3 gene, encoding cyclin D3, was identified as
a new direct target of Bach2. A proper cell cycle was lost at pre-B and mature B
cell stages in Bach2-deficient mice. Furthermore, AZD8055, an mTOR inhibitor,
increased class switch recombination in wild-type mature B cells but not in
Bach2-deficient cells. These results suggest that the mTOR-Bach2 cascade
regulates proper cell cycle arrest in B cells as well as immunoglobulin gene
rearrangement.