其余脂蛋白诱导的光滑肌肉细胞增殖涉及表皮生长因子受体的转活
Akio Kawakami1, Akira Tanaka, Tsuyoshi Chiba
1Department of Medical Biochemistry, Graduate School of Medicine, Tokyo Medical and Dental University, 1-5-45, Yushima, Building D-256, Bunkyo-ku, Tokyo 113-8519, Japan.
Circulation
|November 19, 2003
概括
其余脂蛋白 (RLPs) 通过激活表皮生长因子 (EGF) 受体通路来促进光滑肌肉细胞 (SMC) 增殖. 这种机制涉及蛋白质激酶C (PKC) 和肝素结合EGF类似生长因子 (HB-EGF) 脱落,有助于动脉样硬化发展.
科学领域:
- 心血管生物学 心血管生物学
- 细胞信号传输 细胞信号传输
- 动脉样硬化研究 动脉样硬化研究
背景情况:
- 剩余脂蛋白 (RLPs) 与动脉样硬化有关.
- 血管光滑肌细胞 (SMC) 增殖是动脉样硬化和静脉复缩的关键.
- RLP对中小企业的直接影响需要进一步阐明.
研究的目的:
- 调查RLP对SMC扩散的直接影响.
- 探索RLP介导的SMC响应中涉及的信号传导通路.
主要方法:
- 小鼠大动脉SMC被RLP化.
- 测量了细胞的增殖.
- 评估了蛋白质酸化 (EGF受体,MAPK) 和脱落 (HB-EGF).
- 使用了PKC抑制剂,金属蛋白酶和HB-EGF中和抗体.
- 在apolipoprotein E-knockout和C57BL6小鼠中进行了实验.
主要成果:
- RLPs显著增加了SMC的扩散 (2.3倍).
- RLPs诱导了EGF受体的酸化,随后的MAPK激活和PKC激活.
- RLP治疗导致HB-EGF分泌,该分泌被PKC和金属蛋白酶抑制剂抑制.
- 抗HB-EGF抗体阻断了EGF受体的交换活化和HB-EGF的分泌.
- 这些分子事件在动脉样硬化的小鼠模型中被观察到.
结论:
- 通过EGF受体的交换活化,RLPs刺激SMC的扩散.
- 这种转换是通过PKC激活和HB-EGF脱落来调节的.
- 这些发现突出了一个新的机制,将RLP与动脉样硬化中的血管光滑肌肉细胞增殖联系起来.
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