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阿波利波蛋白CIII将高脂血症与血管内皮细胞功能障碍联系在一起
Akio Kawakami1, Mizuko Osaka, Mariko Tani
1Department of Geriatrics and Vascular Medicine, Life Science and Bioethics Research Center, Tokyo Medical and Dental University, Tokyo, Japan. kawakami.vasc@tmd.ac.jp
Circulation
|July 30, 2008
概括
失脂症中的阿波利波蛋白CIII (apoCIII) 通过激活蛋白激酶C-β (PKCbeta) 来损害血管内皮细胞中的胰岛素信号传递. 这导致内皮功能障碍和减少氧化的产生,导致动脉样硬化.
科学领域:
- 心血管生物学 心血管生物学
- 内分泌学 在内分泌学.
- 代谢综合征研究 代谢综合征研究
背景情况:
- 脂蛋白CIII (apoCIII) 与脂质不良症,胰岛素耐药性和代谢综合征有关.
- 之前的研究表明,apoCIII通过蛋白激酶C-β (PKCbeta) 在内皮细胞中激活了促炎和动脉动脉信号.
- 已知PKCbeta会影响内皮细胞对胰岛素的反应.
研究的目的:
- 为了调查apoCIII影响胰岛素信号传递和血管内皮细胞功能的假设.
- 阐明apocIII在内皮功能障碍中的作用,在体外和体内.
主要方法:
- 在人静脉内皮细胞 (HUVECs) 中评估胰岛素诱导的胰岛素受体基质1 (IRS-1) 的氨酸酸化.
- 测量了酸丁3-激酶 (PI3K) /Akt和内皮氧化合成酶 (eNOS) 的激活和氧化 (NO) 的释放.
- 使用蛋白激酶C-β (PKCbeta) 和MEK1抑制剂.
- 在C57BL/6J小鼠的大动脉和HUVEC中评估的效果,这些小鼠接受了以apoCIII丰富的非常低密度脂蛋白 (VLDL) 治疗.
主要成果:
- 在HUVEC中,ApoCIII抑制了胰岛素诱导的IRS-1氨酸酸化,并降低了PI3K/Akt激活.
- ApoCIII 减少了 eNOS 激活和 NO 释放,同时激活 PKCbeta 并导致 IRS-1 血清酸化.
- 富含ApoCIII的VLDL和apoCIII损害了小鼠大动脉和HUVEC中的胰岛素信号传递和内皮依赖放松.
- 抑制PKCbeta或MEK1恢复了受损的胰岛素信号传递.
结论:
- 在VLDL中的ApoCIII会损害胰岛素刺激的NO生产,并诱导内皮功能障碍.
- 阿波CIII的不良影响是由PKCbeta激活介导的,这种激活抑制了IRS-1/PI3K/Akt/eNOS通路.
- ApoCIII 作为 Endothelial 细胞中失脂症和胰岛素抵抗之间的关键联系,对动脉保护功能产生负面影响.
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