Epigenetic regulation of vascular smooth muscle cell phenotype Vascular smooth muscle cell (SMC) differentiation is a very important process during vasculogenesis and angiogenesis, and it is well recognized that alterations in SMC phenotype play a role in the progression of several prominent cardiovascular disease states including atherosclerosis, hypertension, and restenosis. Although serum response factor (SRF) and the myocardin factors are critical for SMC differentiation, recent studies from our lab and others indicate that epigenetic mechanisms are also critical for the overall pattern of SMC-specific gene expression. Indeed, we identified the histone demethylase, jmjd1a, as a myocardin factor interacting protein and have shown that jmjd1a stimulates SMC differentiation marker gene expression in aortic SMC cultures by demethylating H3K9 near the SMC-specific. A major goal of the current proposal will be to closely examine jmjd1a knock-out mice for effects on SMC phenotype, and we will characterize H3K9 methylation in several in vitro and in vivo models of SMC phenotypic modulation. H3K9 methylation is strongly associated with DNA methylation, and interestingly, the SRF binding regions within the SMC-specific promoters are embedded within CpG islands. Based on our preliminary data indicating that the SMC-specific promoters are regulated by methylation, the goal of Aim 2 is to identify the molecular mechanisms involved. Finally, in an attempt to better understand the global chromatin changes that control SMC phenotype, we have established collaborations with Jason Lieb and Terry Furrey to "map" open chromatin regions in SMC using DNase hypersensitivity and Formaldehyde-Assisted Isolation of Regulatory Elements (FAIRE). We have generated a genome-wide map from human aortic SMC cultures and have identified a number of previously unexamined promoter regions as potentially important for SMC-specific gene expression. The goals of Aim 3 are to test whether these regions drive expression in vivo and to identify the chromatin modifying and transcription factors that are involved.

Public Health Relevance

Vascular smooth muscle cell differentiation is a very important process during the development of blood vessels and it is well recognized that alterations in this process play a role in the progression of several prominent cardiovascular disease states including atherosclerosis, hypertension, and restenosis. Our proposal examines the molecular mechanisms that regulate smooth muscle differentiation and should help to identify therapeutic targets for the treatment of these diseases.

Agency
National Institute of Health (NIH)
Type
Research Project (R01)
Project #
5R01HL109607-03
Application #
8644311
Study Section
Vascular Cell and Molecular Biology Study Section (VCMB)
Program Officer
Gao, Yunling
Project Start
Project End
Budget Start
Budget End
Support Year
3
Fiscal Year
2014
Total Cost
Indirect Cost
Name
University of North Carolina Chapel Hill
Department
Pathology
Type
Schools of Medicine
DUNS #
City
Chapel Hill
State
NC
Country
United States
Zip Code
27599