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Cell Res:阎锡蕴团队在动脉粥样硬化机制研究中获进展

2017-04-24 佚名 生物物理研究所

动脉粥样硬化是冠心病及缺血性脑血管病发生的主要原因。随着人们生活方式的改变,尤其是高脂饮食,动脉粥样硬化的发病率显着上升,由此而导致的死亡率也逐年增加。如何预防和治疗动脉粥样硬化是一个全民关注的健康难题。众所周知,动脉粥样硬化的主要病理特征是大中动脉血管内膜下斑块形成,其中易损斑块容易破裂出血,与心脑血管事件的发生密切相关。易损斑块的形成有以下两个重要因素:一,巨噬细胞泡沫化,即斑块中的巨噬细胞大

动脉粥样硬化是冠心病及缺血性脑血管病发生的主要原因。随着人们生活方式的改变,尤其是高脂饮食,动脉粥样硬化的发病率显着上升,由此而导致的死亡率也逐年增加。如何预防和治疗动脉粥样硬化是一个全民关注的健康难题。

众所周知,动脉粥样硬化的主要病理特征是大中动脉血管内膜下斑块形成,其中易损斑块容易破裂出血,与心脑血管事件的发生密切相关。易损斑块的形成有以下两个重要因素:一,巨噬细胞泡沫化,即斑块中的巨噬细胞大量内吞脂类物质,丧失运动能力,进而大量死亡,释放蛋白酶和脂质,使斑块软化,容易破裂;二,斑块内大量新生血管形成,导致出血和血栓形成。以上因素相互促进,共同影响斑块的易损性。因此,针对以上因素的机制探索和靶向治疗,能有效预防易损斑块的形成。

阎锡蕴团队自从2003年发现肿瘤血管新靶点CD146后,先后阐明了其在血管生成、肿瘤转移和炎症中的重要作用。前期的工作已经发现在动脉粥样硬化临床标本中,CD146的表达与斑块的易损性正相关。本文首次报道CD146是促进易损斑块形成的重要因素并阐明其机制。首先,发现CD146在斑块中的巨噬细胞和血管内皮高表达;机制研究表明,巨噬细胞上的CD146一方面作为脂质内吞的共受体促进巨噬细胞吞入更多脂质,同时作为上游调控分子抑制巨噬细胞的运动能力,从而促进巨噬细胞泡沫化;另外,斑块中血管内皮细胞的CD146发挥促进斑块内血管新生的作用。因此,CD146在易损斑块的形成中发挥双重作用。在高脂诱导的动脉粥样硬化小鼠模型中,敲除巨噬细胞上CD146或者利用特异性靶向CD146的单克隆抗体AA98,可显着抑制斑块的发展并减少易损斑块的形成。因此靶向CD146既能有效阻止巨噬细胞泡沫化,还能抑制新生血管的形成,减少出血危险,从而从根本上抑制易损斑块形成。该研究有望将CD146分子作为一个动脉粥样硬化的治疗靶标,从而预防严重的心脑血管事件的发生。

生物物理所阎锡蕴为论文的通讯作者。阎锡蕴组罗永挺和段红霞、首都医科大学附属安贞医院钱怡宁为论文的共同第一作者。该工作受到国家“973”计划 、国家自然科学基金、中科院基金先导项目等的资助。

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    2017-11-23 维他命
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    2017-04-26 cuiyejia

    学习了,谢谢分享

    0

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