相关实验视频
Updated: Jul 13, 2026

05:41
Non-invasive Assessment of Microvascular and Endothelial Function
Published on: January 29, 2013
内皮功能中的种族特异性差异:非洲裔美国人对血管疾病的倾向
Leszek Kalinowski1, Iwona T Dobrucki, Tadeusz Malinski
1Department of Biochemistry, Ohio University, Athens, OH 45701, USA.
Circulation
|May 26, 2004
概括
与白人相比,来自黑人人的内皮细胞显示氧化 (NO) 减少,超氧化 (O2-) 和过氧化 (ONOO-) 增加,导致血管功能障碍和心血管疾病风险.
科学领域:
- 血管生物学 血管生物学
- 生物化学 生物化学
- 细胞生理学 细胞生理学
背景情况:
- 高血压和糖尿病并发症在黑人群体中比白人群体更严重.
- 超氧化物 (O2-) 和氧化 (NO) 的相互作用,形成过氧化 (ONOO-),是血管病理生理学的关键.
- 在内皮 NO/O2-/ONOO-代谢中的种族差异可能会使黑人患上内皮功能障碍.
研究的目的:
- 研究内皮氧化 (NO),超氧化 (O2) 和过氧化 (ONOO-) 代谢中的种族差异.
- 确定导致黑人内皮功能障碍的潜在机制.
主要方法:
- 使用高度灵敏的电化学纳米传感器测量黑白捐赠者的人类静脉内皮细胞 (HUVEC) 中的NO/O2-/ONOO-释放.
- 分析了NAD(P) H-氧化酶和内皮NO合成酶 (eNOS) 的活性和表达,通过西方免疫阻塞和酶试验.
主要成果:
- 与来自白人个体的HUVEC相比,黑人个体的HUVEC表现出减少生物活性NO释放和增加O2-和ONOO-释放.
- 黑人个体在HUVEC中增加了eNOS表达,与NO生物可用性降低有关,这是由于NO被O2-降解.
- 增加的O2-产量,主要来自NAD(P) H-氧化酶和未结合的eNOS,有助于增加氧化应激.
结论:
- 黑人体内内皮细胞中的NO/O2-/ONOO-平衡转向与内皮功能障碍相关的氧化还原状态.
- 这些代谢变化可能解释了对内皮功能障碍和心血管并发症的种族倾向.
- 通过氧化应激增强NO无活化是黑人内皮功能障碍的标志.
相关概念视频
Stereotypes, Prejudice, and Discrimination
Humans are very diverse and although we share many similarities, we also have many differences. The social groups we belong to help form our identities (Tajfel, 1974). These differences may be difficult for some people to reconcile, which may lead to prejudice toward people who are different. Prejudice is a negative attitude and feeling toward an individual based solely on one’s membership in a particular social group (Allport, 1954; Brown, 2010). Prejudice is common against people who are...
Regulation of Angiogenesis and Blood Supply
Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...
Principles of Pharmacogenetics: Types of Genetic Variants
The human genome is over 99.9% identical between individuals, yet genetic differences exist at millions of bases. The human genome contains approximately 3 million variant positions per individual, many of which are heterozygous, contributing to genetic diversity and individual traits. Genetic variations include single-nucleotide polymorphisms (SNPs), insertions, deletions, and copy number variations (CNVs).SNPs, the most common variation, involve single-base changes in DNA. These can be...
Pharmacogenetic Phenotypes: Alterations in Pharmacokinetics, Drug Targets and Biologic Milieu
Genetic variations significantly influence drug response through pharmacokinetics, receptor interactions, and biologic milieu modifications. Pharmacokinetic alterations impact drug metabolism and clearance, affecting efficacy and toxicity. Variants in drug-metabolizing enzymes, such as CYP2C9 and CYP2C19, alter drug activation and elimination. For example, CYP2C9 loss-of-function variants require lower warfarin doses to prevent excessive bleeding, while CYP2C19 variants reduce clopidogrel...
Coronary Artery Disease I: Introduction
Coronary Artery Disease (CAD): An Overview with Scientific InsightsCoronary Artery Disease (CAD), often referred to as C-A-D, is a prevalent blood vessel disorder classified under the broader category of atherosclerosis. Atherosclerosis is a pathological process characterized by the hardening and narrowing of arteries due to the accumulation of atherosclerotic plaques. These plaques are composed of cholesterol, fatty substances, inflammatory cells, calcium, and fibrin, reducing blood flow to...
Peripheral Artery Disease I: Introduction
Peripheral artery disease (PAD) predominantly results from atherosclerosis, which involves the accumulation of fatty deposits, or plaques, within the walls of arteries. This causes them to narrow and harden, significantly reducing blood flow. PAD predominantly affects the legs, particularly the arteries supplying the thighs and calves. In rare cases, it may involve other arteries, including those in the arms.Etiology of PAD:The principal cause of PAD is atherosclerosis, which results from fatty...

