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循环内皮细胞外囊随着年龄的增长而逐渐增加,并与内皮血管扩张功能障碍有关
Christian S DeSouza1, Kelly A Stockelman1, Jamie G Hijmans1
1Integrative Vascular Biology Laboratory, Department of Integrative Physiology, University of Colorado, Boulder, Colorado 80309.
概括
在健康男性中,随着年龄的增长,循环内皮细胞衍生微囊细胞 (EMV) 增加,而不依赖于危险因素. 较高的EMV水平与内皮功能下降相关,表明它们是血管衰老的生物标志物.
科学领域:
- 心血管科学
- 老龄化研究
- 内皮细胞生物学
背景情况:
- 衰老是心血管疾病的主要危险因素.
- 循环的细胞外囊泡,特别是来自内皮细胞的微囊泡 (EMV),与内皮功能障碍和心血管疾病的进展有关.
- 与年龄相关的内皮功能变化有助于增加心血管疾病的风险.
研究的目的:
- 为了确定循环EMV水平是否随着年龄的增长而增加,独立于心脏代谢风险因素.
- 研究循环EMV与与年龄相关的内皮血管扩张器功能障碍之间的关联.
主要方法:
- 在三个年龄组 (年轻人,中年人,老年人) 中研究了40名健康男性.
- 使用流量细胞计量测量循环EMV度 (CD31+/42b-).
- 通过前臂血流 (FBF) 对乙胆和酸输液的反应来评估内皮血管扩张功能.
主要成果:
- 循环中的EMV水平随着年龄的增长而逐渐增加 (年轻人:54±14,中年:101±30,老年人:132±54).
- 与年轻人相比,中年和老年人群的内皮血管扩张 (FBF对乙胆的反应) 显著降低.
- 与年龄 (r=0. 68) 和内皮血管扩张 (r=- 0. 51至- 0. 48) 呈正相关.
结论:
- 在健康男性中,衰老与心脏代谢风险因素无关,与循环EMV的升高有关.
- 循环中的EMV可以作为与年龄相关的内皮功能障碍的生物标志物.
- 增加的EMV可能会导致与年龄相关的血管疾病风险.
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