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[Simvastatin induced apoptosis and its effect on apoptosis-related gene expression in rat vascular smooth muscle
Gang Cheng1, Jiang Shan, Ji Ma
1The Second Affiliated Hospital, College of Medical Sciences, Zhejiang University, Hangzhou 310009, China.
Abstract:
OBJECTIVE: To observe the influence of simvastatin on the apoptosis of vascular smooth muscle cells (VSMC) and its effects on the expression of apoptosis-related genes. METHODS: The presence of apoptosis was detected by electron microscope and flow cytometry assessment of PI/Annexin V stain; The protein levels of Bax, Bel-2 and activation of caspase-3 were examined using Western blot technique. RESULTS: After treatment with 30 &mgr;mol/L simvastatin for 24 h, apoptosis were identified with electron microscope in VSMC and flow cytometry showed that rate of apoptosis in simvastatin group (35.5+/-5.8)% was singificantly higher than that in control group (15.1+/-5.0)%. Western blot analyses revealed that the apoptosis process was associated with upregulation of Bax protein and activation of caspase-3, but not with Bel-2 expression. CONCLUSION: Simvastatin can induce apoptosis in VSMC in associated with induction of bax and activation of caspase-3.
Insights
Simvastatin induces programmed cell death (apoptosis) in vascular smooth muscle cells (VSMC). This cholesterol-lowering drug increases apoptosis by upregulating Bax protein and activating caspase-3.
Area of Science:
- Cardiovascular Biology
- Molecular Biology
- Pharmacology
Background:
- Vascular smooth muscle cells (VSMC) play a critical role in cardiovascular health and disease.
- Understanding the molecular mechanisms regulating VSMC apoptosis is crucial for developing effective treatments for atherosclerosis.
- Statins, like simvastatin, are widely used to lower cholesterol and have shown pleiotropic effects beyond lipid-lowering.
Purpose of the Study:
- To investigate the effect of simvastatin on VSMC apoptosis.
- To examine the impact of simvastatin on the expression of key apoptosis-related genes in VSMC.
Main Methods:
- Vascular smooth muscle cells (VSMC) were treated with simvastatin.
- Apoptosis was assessed using electron microscopy and flow cytometry with PI/Annexin V staining.
- Protein levels of Bax, Bcl-2, and activated caspase-3 were quantified via Western blot.
Main Results:
- Simvastatin treatment significantly increased the rate of VSMC apoptosis compared to controls.
- Electron microscopy confirmed the presence of apoptotic changes in simvastatin-treated VSMC.
- Western blot analysis revealed increased Bax protein levels and caspase-3 activation, while Bcl-2 expression remained unchanged.
Conclusions:
- Simvastatin demonstrably induces apoptosis in vascular smooth muscle cells.
- The pro-apoptotic effect of simvastatin is mediated through the upregulation of Bax and activation of caspase-3.
- These findings highlight a potential mechanism for simvastatin's cardiovascular benefits involving direct effects on VSMC fate.
