Related Experiment Video
Updated: Apr 28, 2026
A Murine Model of Arterial Restenosis: Technical Aspects of Femoral Wire Injury
Published on: March 10, 2015
STAT4 deficiency protects against neointima formation following arterial injury in mice
Lei Lv1, Qiurong Meng1, Meng Ye1
1Department of Vascular Surgery, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, China.
Abstract:
Signal transducer and activator of transcription 4 (STAT4) has been associated with susceptibility to autoimmune diseases. Intriguingly, we previously reported that STAT4 might play a critical role in vascular smooth muscle cell (VSMC) proliferation. The present study therefore investigated the impact of STAT4 on VSMC migration, apoptosis and neointimal hyperplasia postinjury, as well as the underlying mechanisms. Guide-wire injury was associated with development of intimal neointima, STAT4 and phosphorylated STAT4 (p-STAT4) expressions were apparently up-regulated in the injured arteries. Neointima was greatly blocked in STAT4 knockout (KO) mice compared with wild type (WT) mice. A marked loss of inflammatory cells was identified in the vasculature postinjury in STAT4 KO mice. VSMC apoptosis was enhanced in the vasculature postinjury in STAT4 KO mice compared with WT mice. Cultured primary STAT4 KO VSMCs displayed reduced migration in comparison with WT controls. Mechanically, the deletion of STAT4 potently decreased the level of MCP-1, and its downstream targets MMP1 and MMP2. The effect of STAT4 on VSMC apoptosis was mainly mediated by the activation of the mitochondrial apoptotic pathway, as manifested by increased cytochrome c release and the activation of caspase-3. STAT4 therefore represents a promising molecular target to limit restenosis after artery intervention.
Insights
Signal transducer and activator of transcription 4 (STAT4) inhibition significantly reduced neointimal hyperplasia and vascular smooth muscle cell migration and apoptosis post-injury. STAT4 is a promising target for limiting restenosis after artery intervention.
Area of Science:
- Cardiovascular Biology
- Immunology
- Molecular Biology
Background:
- Signal transducer and activator of transcription 4 (STAT4) is linked to autoimmune diseases and vascular smooth muscle cell (VSMC) proliferation.
- STAT4's role in VSMC migration, apoptosis, and neointimal hyperplasia post-injury requires further investigation.
Purpose of the Study:
- To investigate the impact of STAT4 on VSMC migration, apoptosis, and neointimal hyperplasia following arterial injury.
- To elucidate the underlying molecular mechanisms of STAT4's influence on these processes.
Main Methods:
- Utilized a mouse model with guide-wire induced arterial injury.
- Compared STAT4 knockout (KO) mice with wild-type (WT) mice, assessing neointimal hyperplasia, inflammatory cell infiltration, and VSMC apoptosis.
- Analyzed VSMC migration, MCP-1, MMP1, MMP2, and mitochondrial apoptotic pathway markers (cytochrome c, caspase-3) in vitro and in vivo.
Main Results:
- STAT4 and phosphorylated STAT4 (p-STAT4) expression increased in injured arteries.
- STAT4 KO mice exhibited significantly reduced neointima formation and inflammatory cell infiltration compared to WT mice.
- STAT4 deficiency enhanced VSMC apoptosis, reduced VSMC migration, and decreased MCP-1, MMP1, and MMP2 levels.
- STAT4-mediated apoptosis involved the mitochondrial pathway, evidenced by increased cytochrome c release and caspase-3 activation.
Conclusions:
- STAT4 plays a critical role in neointimal hyperplasia, VSMC migration, and apoptosis post-arterial injury.
- STAT4 inhibition effectively reduces restenosis by modulating inflammatory responses and apoptosis.
- STAT4 represents a potential therapeutic target for preventing post-intervention restenosis.
