BACKGROUND-: Soluble stem cell factor (SCF) has been shown to mobilize bone marrow stem cells and improve cardiac repair after myocardial infarction (MI). However, the effect of membrane-associated SCF on cardiac remodeling after MI is not known. The present study investigated the effects of cardiomyocyte-specific overexpression of the membrane-associated isoform of human SCF (hSCF) on cardiac function after MI. METHODS AND RESULTS-: A novel mouse model with tetracycline-inducible and cardiac-specific overexpression of membrane-associated hSCF was generated. MI was induced by left coronary artery ligation. Thirty-day mortality after MI was decreased in hSCF/tetracycline transactivator (tTA) compared with wild-type mice. In vivo cardiac function was significantly improved in hSCF/tTA mice at 5 and 30 days after MI compared with wild-type mice. Endothelial progenitor cell recruitment and capillary density were increased and myocardial apoptosis was decreased in the peri-infarct area of hSCF/tTA mice. Myocyte size was decreased in hSCF/tTA mice 30 days after MI compared with WT mice. Furthermore, hSCF overexpression promoted de novo angiogenesis as assessed by matrigel implantation into the left ventricular myocardium. CONCLUSIONS-: Cardiomyocyte-specific overexpression of hSCF improves myocardial function and survival after MI. These beneficial effects of hSCF may result from increases in endothelial progenitor cell recruitment and neovascularization and decreases in myocardial apoptosis and cardiac remodeling.
摘自:《西氏内科学》,第23版
患者女性,21岁,因干咳、间歇性气促2个月到急诊科就诊。开始症状为上呼吸道感染引起的鼻塞、流涕和咳嗽。医生检查后开了抗生素。服药后鼻部症状缓解,但仍有轻微干咳和呼吸困难。其他症状包括疲劳和焦虑。否认发热、体重减轻、胸痛、端坐呼吸、气喘、鼻后滴漏、胃灼热以及神经系统症状。
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