内皮衍生的高极化因子:人类皮下抗性动脉的鉴定和作用机制
P Coats1, F Johnston, J MacDonald
1Department of Biological and Biomedical Sciences, Glasgow Caledonian University, Glasgow, Scotland. p.coats@gcal.ac.uk
Circulation
|March 29, 2001
概括
内皮衍生的高极化因子 (EDHF) 是人体动脉血管扩张的主要原因,源于酸代谢,而不是离子.
科学领域:
- 血管生物学 血管生物学
- 心血管生理学心血管生理学
- 内皮的功能是内皮的功能.
背景情况:
- 内皮衍生的高极化因子 (EDHF) 和离子 (K+) 是动物血管组织中已知的血管扩张因子.
- 血管内皮细胞染色体P450 (CYP450) 产物也被确定为EDHFs. 阿拉基酸代谢的产物也被确定为EDHFs.
- 在人类血管扩张中,EDHF,氧化 (NO) 和前环素 (PGI2) 的相对重要性尚未完全被理解.
研究的目的:
- 确定EDHF,NO和PGI2对人体皮下动脉血管扩张的相对贡献.
- 调查EDHF血管扩张作用背后的机制,并确定其特定途径.
主要方法:
- 分析了来自41名健康志愿者的人体皮下抗性动脉.
- 测量了由乙胆诱导的血管扩张,包括和没有NO,PGI2的抑制剂,以及膜高极化.
- 使用特定的抑制剂研究了K+和EDHF介导放松的机制.
主要成果:
- 在乙胆介导的血管扩张中,EDHF约占80%.
- EDHF的作用对和瓦不敏感,与K+介导的放松有所区别.
- 通过EDHF介导的血管扩张对脂酶A2和CYP450抑制剂敏感.
结论:
- 在人体皮下动脉中,EDHF是内皮依赖血管扩张的主要因素.
- EDHF被确定为通过脂酶A2和CYP450途径的基酸代谢的产物.
- 在人体皮下抗性动脉中,K+不是主要的EDHF.
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