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相关概念视频

Lipid-Lowering Drugs: Statins and Miscellaneous Agents01:20

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Hyperlipidemia, a medical condition often referred to as high cholesterol, is characterized by abnormally elevated levels of lipids in the bloodstream. When present in excess, these lipids, specifically cholesterol and triglycerides, can lead to serious health complications, often involving cardiovascular diseases. Illnesses like atherosclerosis, heart attacks, and pancreatitis have all been linked to untreated hyperlipidemia. This means controlling and regulating cholesterol and triglyceride...
Lipids: Dietary Sources and Requirements01:18

Lipids: Dietary Sources and Requirements

Lipids are an essential component of a balanced human diet. Triglycerides, which make up the majority of dietary lipids, are found in both saturated fats—commonly present in meat, dairy products, and certain tropical plants like coconut, and hydrogenated oils such as margarine and baking shortenings (trans fats)—and unsaturated fats, which are abundant in seeds, nuts, olive oil, and most vegetable oils. The main sources of cholesterol include egg yolks, various meats and organ meats, shellfish,...
Cholesterol: Significance and Regulation01:29

Cholesterol: Significance and Regulation

Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces.
Considering cholesterol and...
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Atherosclerosis I: Introduction01:30

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Atherosclerosis is a progressive disorder characterized by the buildup of plaques on the arterial inner wall, causing them to narrow and harden over time. These plaques comprise lipids, calcium, blood components, carbohydrates, and fibrous tissue. The process primarily affects the intima of large and medium-sized arteries, reducing blood flow in any artery.Etiology and risk factorsThe cause of atherosclerosis is multifactorial, involving a complex interplay among endothelial injury, lipid...
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Cholesterol Efflux Assay
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血清降低细胞乙CoA:胆固醇乙转移酶活性的能力预测心血管结果.

Julio A Chirinos1, Juan P Zambrano, Simon Chakko

  • 1Miller School of Medicine, University of Miami, Miami, FL 33138, USA.

Circulation
|October 19, 2005
PubMed
概括

血清胆固醇外流活动,以其降低胆固醇以使胆固醇变质的能力来衡量,独立预测男性的主要不良心血管事件 (MACE) 和死亡. 这一发现为评估心血管风险提供了新的见解.

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科学领域:

  • 心血管医学 心血管医学
  • 生物化学 生物化学
  • 脂质代谢 脂质代谢是什么

背景情况:

  • 研究了血清胆固醇外流活动与冠状动脉疾病 (CAD) 之间的关联.
  • 研究了胆固醇排放与重大心血管不良事件 (MACE) 和死亡风险之间的联系.

研究的目的:

  • 为了确定血清胆固醇排泄活动是否预测血管学CAD的存在.
  • 评估胆固醇外流活动与MACE和死亡风险的关联.

主要方法:

  • 研究了168名接受冠状动脉血管造影的男性.
  • 使用患者血清和人类皮肤纤维细胞测量了体外胆固醇排泄活性.
  • 通过血清降低可用于acylCoA:胆固醇乙烯转移酶 (ACAT) 化可用的胆固醇的能力来定义排泄活性.
  • 随访患者4.5年来跟踪MACE和死亡.

主要成果:

  • 血清诱导的ACAT活性变化与HDL水平或CAD存在没有相关性.
  • 在ACAT活性变化的最高三位数中的患者,MACE (HR,2.15) 和死亡 (HR,2.23) 的风险明显更高.
  • 这些相关性与其他风险标志物 (如LDL,HDL和C反应蛋白) 保持独立.

结论:

  • 血清能够耗尽细胞胆固醇以进行ACAT化,这是MACE和死亡的强大,独立的预测因子.
  • 据推测,这种活动涉及ATP结合盒载体A1 (ABCA1) 介导的流动.
  • 假设血清中影响ACAT的HDL颗粒增加与体内有限的ABCA1活性有关.