Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/60360
標題: HDAC1/HDAC3 modulates PPARG2 transcription through the sumoylated CEBPD in hepatic lipogenesis
作者: Lai, P.H.
楊文明
Wang, W.L.
Ko, C.Y.
Lee, Y.C.
Yang, W.M.
Shen, T.W.
Chang, W.C.
Wang, J.M.
關鍵字: PPARG2
CEBPD
lipogenesis
HDAC1/3
sumoylation
activated receptor-gamma
terminal adipocyte differentiation
binding-protein-delta
gene-expression
3t3-l1 cells
c/ebp-alpha
in-vitro
retinoblastoma protein
histone deacetylase-3
adipose
conversion
期刊/報告no:: Biochimica Et Biophysica Acta-Molecular Cell Research, Volume 1783, Issue 10, Page(s) 1803-1814.
摘要: CCAAT/Enhancer binding proteins (C/EBPs) and peroxisome proliferator-activated receptors gamma (PPARG) play critical roles in the regulation of lipid metabolism genes. Overexpression of CEBPdelta (CEBPD) enhances lipid accumulation and specifically activates PPARG2 transcription in HepG2 cells. By using 5'-serial deletion reporter analysis, we show that the region comprising the -457 to +129 base pairs is required for CEBPD response of the PPARG2 promoter. Two critical CEBPD-binding motifs on the -324/-311 and -158/-145 of human PPARG2 promoter are identified. We previously have shown that the human CEBPD is sumoylated by small ubiquitin-related modifier-1 (SUMO1). We further demonstrated that the sumoylation of CEBPD lysine 120 is also detectable in HepG2 cells, and this modification functions for binding of the recruits, HDAC1 and HDAC3. Meanwhile, an in vivo chromatin IP assay demonstrated that the sumoylation mutant of CEBPD lost a significant portion of HDAC1 and HDAC3 interaction. Combining that the increasing amount of CEBPD and the sumoylated CEBPD (suCEBPD) consistently responded to lipogenic stimulation, these results suggest that the excess non-sumoylated CEBPD could be a critical activator which reverses suCEBPD/HDAC1/HDAC3-mediated PPARG2 gene inactivation and promotes hepatic lipogenesis. Taken together, we suggest that suCEBPD/HDAC1/HDAC3 complex inactivates PPARG2 transcription, and the induction of CEBPD expression transiently activates PPARG2 transcription which is involved in adipocyte-like lipogenesis in HepG2 cells. (c) 2008 Elsevier B.V. All rights reserved.
URI: http://hdl.handle.net/11455/60360
ISSN: 0167-4889
文章連結: http://dx.doi.org/10.1016/j.bbamcr.2008.06.008
Appears in Collections:分子生物學研究所

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