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Effects of granulocyte-colony stimulating factor on cardiac remodeling after myocardial infarction
Yasuhiro Takagi1, Minoru Yoshiyama, Takashi Omura
1Department of Internal Medicine and Cardiology, Osaka City University, Graduate School of Medicine, 1-4-3, Asahimachi, Abeno-ku, Osaka 545-8585, Japan. ytakagi@hotmail.co.jp
Insights
Granulocyte colony-stimulating factor (G-CSF) treatment improved cardiac function after myocardial infarction (MI) in mice. G-CSF may prevent adverse cardiac remodeling by increasing matrix metalloproteinase-2 (MMP-2) expression.
Area of Science:
- Cardiology
- Regenerative Medicine
- Molecular Biology
Background:
- Granulocyte colony-stimulating factor (G-CSF) shows potential in treating myocardial infarction (MI).
- The precise molecular mechanisms of G-CSF's therapeutic effects on post-MI cardiac repair remain unclear.
Purpose of the Study:
- To investigate the impact of G-CSF on cardiac function and remodeling following MI.
- To explore the role of matrix metalloproteinase-2 (MMP-2) in G-CSF mediated cardiac repair.
Main Methods:
- Mice underwent MI induction and were divided into control and G-CSF treated groups.
- Cardiac function was assessed using Doppler echocardiography.
- Non-infarcted myocardial mRNA expression, including MMP-2, was analyzed via northern blot.
Main Results:
- MI significantly impaired cardiac function, evidenced by decreased E/A ratios.
- G-CSF treatment significantly improved cardiac function (lower E/A ratios) compared to untreated MI mice.
- Matrix metalloproteinase-2 (MMP-2) mRNA expression was significantly upregulated in G-CSF treated MI mice.
Conclusions:
- G-CSF administration mitigates adverse left ventricular (LV) remodeling and cardiac dysfunction post-MI.
- Upregulation of MMP-2 in non-infarcted myocardium is a potential mechanism for G-CSF's cardioprotective effects.
Background:
Recent studies suggest that granulocyte colony-stimulating factor (G-CSF) may be beneficial in the treatment of myocardial infarction (MI). However, the effects of G-CSF on MI are still controversial and the molecular mechanism of G-CSF treatment for repair of the infarcted heart is not fully understood.
Methods:
Mice were divided into three groups: Control, MI and MI treated with G-CSF. Four weeks after MI, we examined cardiac function by Doppler echocardiography and measured non-infarcted myocardial mRNA expression by northern blot analysis.
Results:
Cardiac function decreased significantly in the MI groups compared with the sham-operated groups. Additionally, the ratios of E wave to A wave peak velocity (E/A) in the MI groups were higher than in the control group. E/A in G-CSF MI mice was significantly lower than in control MI mice (p<0.01). Matrix metalloproteinase-2 (MMP-2) mRNA expression was significantly increased in the MI groups compared with the control group (p<0.01). Furthermore, mRNA expression in the G-CSF MI group was significantly higher than in the Control MI group (p<0.05).
Conclusions:
G-CSF can prevent the LV remodeling process after MI that accompanies progressive cardiac dysfunction. One of the mechanisms of G-CSF treatment for cardiac remodeling after MI may be overexpression of MMP-2 in non-infarcted myocardium.
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