C/EBPalphap30 plays transcriptional regulatory roles distinct from C/EBPalphap42.

Abstract:

:CCAAT/enhancer binding protein alpha (C/EBPalpha) is a transcriptional regulatory factor that inhibits cell proliferation, and alternative translational initiation produces two polypeptides, C/EBPalphap30 and C/EBPalphap42. By expression profiling, it was revealed that C/EBPalphap30 specifically inhibited a unique set of genes, including MPP11, p84N5 and SMYD2, which were not affected by C/EBPalphap42 in both QSG-7701 hepatocyte cell line and QGY-7703 hepatoma cells. Semi-quantitative RT-PCR analysis independently confirmed these results. Chromatin immunoprecipitation assay showed that C/EBPalphap30 bound to the promoters of these genes more strongly than C/EBPalphap42. In clinical hepatoma samples in which C/EBPalpha was downregulated, all three genes specifically inhibited by C/EBPalphap30 were upregulated. However, repression of MPP11, p84N5 and SMYD2 genes might not be directly involved in C/EBPalphap30-mediated growth inhibition. Our data suggest that C/EBPalphap30 regulates a unique set of target genes and is more than a dominant-negative regulator of C/EBPalphap42.

journal_name

Cell Res

journal_title

Cell research

authors

Wang C,Chen X,Wang Y,Gong J,Hu G

doi

10.1038/sj.cr.7310121

subject

Has Abstract

pub_date

2007-04-01 00:00:00

pages

374-83

issue

4

eissn

1001-0602

issn

1748-7838

pii

7310121

journal_volume

17

pub_type

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