在血管损伤后的neointima形成中对p38基因激活蛋白激酶活性的要求
Brandon M Proctor1, Xiaohua Jin, Traian S Lupu
1Center for Cardiovascular Research, Department of Medicine, Washington University, St. Louis, School of Medicine, ST. Louis, Mo., USA.
Circulation
|July 23, 2008
概括
血管光滑肌细胞p38alpha MAPK激活对于血管塑性手术后的neointimal病变形成至关重要. 抑制这种途径可以防止病变的发展,并减少相关的细胞增殖和DNA复制.
科学领域:
- 心血管生物学 心血管生物学
- 分子医学是分子医学.
- 血管细胞生物学 血管细胞生物学
背景情况:
- 血管整形和支架可以导致新极端病变的形成,这是动脉样硬化血管疾病的并发症.
- 增长因子受体结合蛋白2 (Grb2) 在血管光滑肌细胞 (SMCs) 中对新密素形成和p38 MAPK激活至关重要.
- 血管SMC p38alpha MAPK在新极端发育中的特定作用需要进一步研究.
研究的目的:
- 检查血管SMC p38alpha MAPK在新极端病变的发展中的作用.
- 阐明p38alpha MAPK通过哪些分子机制为Neointima形成作出贡献.
主要方法:
- 生成的复合转基因小鼠具有多西环素诱导性SMC特异表达的主导负p38alpha MAPK (DN-p38alpha).
- 服用多西环素来诱导DN-p38alpha表达,并评估心血管损伤后的neointima形成.
- 利用体外SMC培养系统研究p38alpha MAPK抑制 (SB202190或siRNA) 对SMC增殖和相关分子事件的影响.
主要成果:
- 在转基因小鼠动脉中,多西环林治疗成功诱导了DN-p38alpha表达.
- 接受过多西环素治疗的小鼠表现出对新内形成的抵抗力,并在 carotid 损伤后减少了 p38 MAPK 激活.
- 在培养的SMC中抑制p38alpha MAPK阻断了血小板衍生生长因子诱导的增殖,DNA复制,视网膜母细胞蛋白酸化和小染色体维护蛋白6诱导.
结论:
- 血管SMC p38alpha MAPK激活是新极端病变形成的必要组成部分.
- p38alpha MAPK可能通过促进视网膜母细胞瘤蛋白酸化和小染色体维护蛋白6的表达来促进新密的形成.
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