RGD Reference Report - Enhancer of polycomb1 lessens neointima formation by potentiation of myocardin-induced smooth muscle differentiation. - Rat Genome Database

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Enhancer of polycomb1 lessens neointima formation by potentiation of myocardin-induced smooth muscle differentiation.

Authors: Joung, H  Kwon, JS  Kim, JR  Shin, S  Kang, W  Ahn, Y  Kook, H  Kee, HJ 
Citation: Joung H, etal., Atherosclerosis. 2012 May;222(1):84-91. doi: 10.1016/j.atherosclerosis.2012.02.015. Epub 2012 Feb 18.
RGD ID: 9587795
Pubmed: (View Article at PubMed) PMID:22398275
DOI: Full-text: DOI:10.1016/j.atherosclerosis.2012.02.015

OBJECTIVE: Previously, we reported that enhancer of polycomb1 (Epc1) induces skeletal muscle differentiation through the serum response factor (SRF). Considering that SRF plays a critical role in vascular smooth muscle cell (VSMC) differentiation, we expected that Epc1 also works in VSMCs. Here we examined the effect of Epc1 on neointima formation after arterial balloon injury and the underlying mechanism. METHODS: Epc1 expression was examined in carotid artery injury or VSMC models. Interaction with myocardin (Myocd), a master regulator of smooth muscle differentiation, was examined by immunoprecipitation or promoter analysis with smooth muscle (SM) 22alpha promoter. Finally, we investigated whether local delivery of Epc1 regulated neointimal formation after injury. RESULTS: Epc1 expression was down-regulated during proliferation induced by platelet-derived growth factor BB, whereas it was upregulated during differentiation in VSMCs. Forced expression of Epc1 induced VSMC differentiation. Epc1 physically interacted with Myocd to synergistically activate SM22alpha promoter activity. Transient transfection of Epc1 enhanced the physical interaction between Myocd and SRF, whereas that interaction was reduced when A10 cells were treated with siRNA for Epc1. Local delivery of Epc1 significantly reduced neointima formation induced by balloon injury. CONCLUSIONS: Our results indicate that Epc1 induces VSMC differentiation by interacting with Myocd to induce SRF-dependent smooth muscle genes. We propose that Epc1 acts as a novel negative regulator of neointima formation after carotid injury.

Disease Annotations    
Neointima  (IDA,ISO)

Gene Ontology Annotations    

Biological Process

Molecular Function

Objects Annotated

Genes (Rattus norvegicus)
Epc1  (enhancer of polycomb homolog 1)
Myocd  (myocardin)

Genes (Mus musculus)
Epc1  (enhancer of polycomb homolog 1)

Genes (Homo sapiens)
EPC1  (enhancer of polycomb homolog 1)

Additional Information