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Cholesterol Efflux Assay
Published on: March 6, 2012
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在血管光滑肌细胞中恢复胆固醇外流,通过肝 X 受体激活转化为泡细胞
Carla Borràs1, Noemí Rotllan2, Raquel Griñán3
1Institut de Recerca Sant Pau (IR SANT PAU), Barcelona, Spain; Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, Barcelona, Spain; CIBER de Diabetes y Enfermedades Metabólicas Asociadas, CIBERDEM, Madrid, Spain.
概括
肝脏X受体 (LXR) 的激活增强了从血管光滑肌细胞 (VSMC) 到便的逆胆固醇运输. 将LXR激动剂与ACAT抑制剂结合起来,可以通过恢复泡细胞中的胆固醇平衡来治疗动脉样硬化.
科学领域:
- 心血管生物学 心血管生物学
- 动脉样硬化研究 动脉样硬化研究
- 脂质代谢 脂质代谢是什么
背景情况:
- 血管光滑肌细胞 (VSMC) 在动脉样硬化病变中对泡细胞的形成有显著的贡献.
- 已知肝X受体 (LXR) 激动剂通过高密度脂蛋白 (HDL) 来增强巨细胞的胆固醇排放.
研究的目的:
- 在体内研究LXR激活对从VSMC到便的逆胆固醇转移 (RCT) 速度的影响.
- 评估LXR激动剂和ACAT抑制剂在恢复胆固醇平衡中的治疗潜力.
主要方法:
- 使用甲基-β-环极 (MBD) 用胆固醇加载人类和小鼠的VSMC.
- 将LXR激动剂T090137和/或ACAT抑制剂用于含胆固醇的VSMC.
- 追踪从注射VSMC到小鼠的血清,HDL和便中的放射性标记胆固醇流量.
主要成果:
- 从装有MBD的VSMC中排出的胆固醇流量显著减少,但通过LXR激动剂治疗而增强.
- 激活LXR会增加血清和HDL中的放射性标记胆固醇,并使便分泌量增加一倍.
- 结合LXR激动剂和ACAT抑制剂的治疗协同增强了RCT,使其恢复到与非脂质载荷细胞相当的水平.
结论:
- 在转化为泡细胞的VSMC中,HDL介导的胆固醇外流受损.
- 激活LXR有效地增强从VSMC到便的RCT,并恢复受损的运输.
- 使用LXR激动剂和ACAT抑制剂的组合疗法显示,通过使脂载VSMC中的胆固醇水平正常化,有望治疗动脉样硬化.
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