S-Space College of Medicine/School of Medicine (의과대학/대학원) Internal Medicine (내과학전공) Journal Papers (저널논문_내과학전공)
Forkhead transcription factor FOXO3a is a negative regulator of angiogenic immediate early gene CYR61, leading to inhibition of vascular smooth muscle cell proliferation and neointimal hyperplasia
- Lee, Hae-Young; Chung, Jae-Woong; Youn, Seock-Won; Kim, Ju-Young; Park, Kyung-Woo; Koo, Bon-Kwon; Oh, Byung-Hee; Park, Young-Bae; Chaqour, Brahim; Walsh, Kenneth; Kim, Hyo-Soo
- Issue Date
- American Heart Association
- Circ Res. 2007 Feb 16;100(3):372-80. Epub 2007 Jan 18.
- Angiotensin II/pharmacology; Animals; Aorta, Thoracic; Apoptosis/drug effects; Atherosclerosis/metabolism/pathology; Balloon Dilatation/adverse effects; Carotid Artery Injuries/etiology/genetics/metabolism; Cell Division/drug effects; Cells, Cultured/drug effects; Culture Media/pharmacology; Culture Media, Conditioned/pharmacology; Cysteine-Rich Protein 61; Forkhead Transcription Factors/genetics/*physiology; Gene Expression Regulation/physiology; Genes, Reporter; Humans; Hyperplasia; Immediate-Early Proteins/biosynthesis/genetics/*physiology; Intercellular Signaling Peptides and; Proteins/biosynthesis/genetics/pharmacology; Male; Mice; Muscle, Smooth, Vascular/*cytology; Oligonucleotides, Antisense/genetics; Promoter Regions, Genetic; Rats; Rats, Sprague-Dawley; Recombinant Fusion Proteins/physiology; Transcription, Genetic; Transduction, Genetic; Tunica Intima/pathology
- Cysteine-rich angiogenic protein 61 (CYR61, CCN1) is an immediate early gene expressed in vascular smooth muscle cells (VSMCs) on growth factor stimulation, and its expression has been suggested to be associated with postangioplasty restenosis. The forkhead transcription factors are reported to play various roles in cellular proliferation, apoptosis, and even adaptation to cellular stress. We hypothesized that the forkhead transcription factor FOXO3a may regulate CYR61 expression in VSMCs and investigated the CYR61-modulating effect of FOXO3a in the process of vascular response to vasoactive signals and vascular injury. To evaluate the effect of FOXO3a on CYR61 expression, rat VSMCs were infected with adenoviral vectors expressing constitutively active FOXO3a (Ad-TM-FOXO3a). Constitutively active FOXO3a gene transduction suppressed CYR61 expression. Luciferase assay with the deletion constructs of the forkhead factor binding motif in CYR61 promoter region, which resulted in a significant decrease in luciferase expression compared with the intact construct, and chromatin immunoprecipitation analysis confirmed transcriptional regulation of CYR61 by FOXO3a. Serum and angiotensin II rapidly induced CYR61 expression, which was significantly reduced by Ad-TM-FOXO3a. Reduction of VSMC proliferation and migration associated with FOXO3a activation was significantly reversed by cotransfection of adenoviral vector expressing CYR61, whereas apoptosis induction by FOXO3a was not influenced. In a rat balloon carotid arterial injury model, CYR61 was rapidly induced in VSMCs in the early stage of injury and remained elevated until 14 days, which was suppressed by Ad-TM-FOXO3a transfection. After 14 days, there was a significant reduction in neointima by FOXO3a transduction compared with the control group (0.06+/-0.02 versus 0.20+/-0.07 mm(2), P<0.01). Such reduction of neointimal hyperplasia by Ad-TM-FOXO3a was reversed by CYR61 replenishment. These data suggest that FOXO3a is a negative transcription factor of CYR61 and that suppression of CYR61 is among several mechanisms by which FOXO3a inhibits VSMC proliferation and neointimal hyperplasia.
- 1524-4571 (Electronic)