在光滑肌细胞中,高胆固醇血诱导的LXR信号传递有助于血管损伤重塑和内脏功能
Hanming Zhang1,2,3, Diego Sáenz de Urturi1,2,3, Pablo Fernández-Tussy1,2,3
1Vascular Biology and Therapeutics Program, Yale University School of Medicine, New Haven, CT 06520.
概括
肝X受体 (LXR) 在血管光滑肌细胞 (VSMC) 中的信号传递对于在动脉样硬化期间保持动脉健康和斑块稳定至关重要. 在VSMC中LXR缺乏促进有害的病变重塑,并损害血管功能.
科学领域:
- 心血管生物学 心血管生物学
- 动脉样硬化研究 动脉样硬化研究
- 细胞的新陈代谢
背景情况:
- 血管光滑肌细胞 (VSMCs) 是血管度和动脉样硬化中病变重塑的关键调节者.
- 像巨细胞一样,VSMCs在动脉样硬化斑块中积累脂质,但它们的代谢作用还未得到充分研究.
- 肝脏X受体 (LXR) 途径在动脉发生过程中在VSMC中被激活.
研究的目的:
- 研究VSMC脂质代谢,特别是LXR信号传导在调节血管功能和动脉样硬化病变改造中的作用.
- 阐明VSMC中LXR信号影响斑块稳定性和细胞表型的机制.
主要方法:
- 在高胆固醇条件下利用了SMC特异性LXR缺陷的小鼠模型.
- 分析了动脉样硬化病变形态,斑块稳定性指数 (死核,纤维帽厚度) 和血管功能.
- 研究了参与胆固醇流失和脂肪酸合成的基因表达.
主要成果:
- 特定于SMC的LXR缺陷改变了未分化的VSMC的命运,促进过渡细胞积累和减少斑块稳定性.
- 减少斑块稳定性的证据是死核核心面积增加和纤维帽厚度降低.
- 观察到血管功能受损和内脏肌病,包括膀重塑和肠道脂质吸收不良.
- 确定了关键基因 (例如,Abca1,Srebf1,Scd1) 参与胆固醇流失和脂肪酸合成的下调.
结论:
- 在VSMC中LXR信号传递对于维持血管平衡和预防动脉样硬化期间的不适应性重塑至关重要.
- 在VSMC中LXR信号的破坏加剧了动脉样硬化病变的进展,并损害了血管和器官功能.
- 准VSMC LXR通路可能为动脉样硬化提供治疗策略.
相关概念视频
01:29Cholesterol: Significance and Regulation
496
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...
Considering cholesterol and...
496
01:20Lipid-Lowering Drugs: Statins and Miscellaneous Agents
506
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...
506
01:38Inflammation
52.2K
Overview
52.2K
01:31Lipid-derived Compounds in the Human Body
4.3K
Fats and lipids are crucial components in the human body. Some lipid-derived compounds, such as fat-soluble vitamins, eicosanoids, lipoproteins, and glycolipids, also play unique roles to support various biological processes .
Fat-soluble Vitamins
Fat-soluble vitamins, including vitamins A, D, E, and K, are required in minimal quantities, but their deficiencies can lead to severely abnormal physiological conditions. For example, vitamin A deficiency can cause night blindness, dry skin,...
Fat-soluble Vitamins
Fat-soluble vitamins, including vitamins A, D, E, and K, are required in minimal quantities, but their deficiencies can lead to severely abnormal physiological conditions. For example, vitamin A deficiency can cause night blindness, dry skin,...
4.3K
01:18Lipids: Dietary Sources and Requirements
649
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...
649
01:25Blood Studies for Cardiovascular System III: Serum Lipid Profile
116
Understanding serum lipids is crucial for maintaining cardiovascular health and preventing heart disease and stroke.
Serum lipids are fats and fatty substances in the blood and are crucial for various bodily functions, including energy storage, cellular structure, and hormone production. Serum lipids consist of cholesterol, triglycerides, and phospholipids.
Cholesterol is a soft, fat-like substance found in all body cells. It is crucial for producing hormones, vitamin D, and substances that aid...
Serum lipids are fats and fatty substances in the blood and are crucial for various bodily functions, including energy storage, cellular structure, and hormone production. Serum lipids consist of cholesterol, triglycerides, and phospholipids.
Cholesterol is a soft, fat-like substance found in all body cells. It is crucial for producing hormones, vitamin D, and substances that aid...
116