期刊
CELLULAR SIGNALLING
卷 21, 期 2, 页码 309-316出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cellsig.2008.10.018
关键词
THOC5; C/EBP beta; PI3Kinase; Differentiation; Monocyte; Spliceosome
类别
资金
- BBSRC
- Leukaemia Research Fund, UK
THOC5 is a nuclear/cytoplasmic protein member of the spliceosome complex which potentiates C/EBP expression in adipocyte differentiation. As C/EBP family members are important regulators of myelopoiesis and THOC5 is highly expressed in neutrophil/macrophage progenitor cells we assessed the role of THOC5 in cytokine-stimulated monocytic development. M-CSIF stimulated maturation of the NFS60 cell line was associated with enhanced THOC5 expression and phosphorylation. THOC5 was also shown to form a complex with C/EBP beta. Ectopic expression of THOC5 mimicked M-CSF mediated cell maturation and enhanced protein expression of the myeloid transcription factors C/EBP beta, C/EBP alpha, Pu-1 and also GAB2 (a PI-3 Kinase and macrophage development regulator). Increased THOC5 expression also mimicked M-CSF stimulated increases in the lipid second messenger PtdInsP(3). Inhibition of THOC5-induced increases in PtdInsP3 levels abrogated the elevated levels of C/EBP beta. Thus THOC5 expression can potentiate receptor signalling to transcription factor expression and monocyte differentiation. (c) 2008 Elsevier Inc. All rights reserved.
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