视网和视网结合蛋白:在代谢疾病中意想不到的作用
William S Blaner1, Jisun Paik2, Pierre-Jacques Brun1
1Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, NY, United States.
Current topics in developmental biology
|January 27, 2025
概括
视网醇结合蛋白RBP2和RBP4将视网蛋白和内分泌大麻素路径与代谢疾病联系起来. RBP2与内分泌物结合,影响依赖葡萄糖的胰岛素型多 (GIP) 和肥胖症,而RBP4与GIP和葡萄糖一起分泌.
科学领域:
- 代谢性疾病研究研究.
- 内分泌学 在内分泌学.
- 分子生物学分子生物学
背景情况:
- 视网醇结合蛋白 (RBPs) 的变化,特别是RBP2和RBP4,与肥胖,葡萄糖不耐受和肝硬化等代谢障碍有关.
- 连接视网代谢和代谢疾病发展的新途径正在被发现.
- RBP2在结合内分泌素中的作用及其与代谢调节的潜在联系是研究领域.
研究的目的:
- 调查RBP2与2-单糖醇 (2-MAG) 的新生化学和结构相互作用,包括2-阿拉基多糖醇 (2-AG).
- 阐明RBP2作为内分泌素的结合蛋白的生理相关性及其与视网体信号的融合.
- 检查RBP2和RBP4在新陈代谢调节中的作用,特别是在应对饮食挑战和它们与基激素的关联方面.
主要方法:
- 生物化学和结构分析以确定与视网醇和2-MAG的RBP2结合亲缘关系和相互作用.
- 使用Rbp2-null小鼠挑战口腔脂肪负载的研究,以评估体内对内分泌大麻素和内分泌激素水平的影响.
- 免疫组织化学和共分泌分析,以调查RBP4在K细胞和胰腺α细胞中的存在和共定位,分别与GIP和葡萄糖.
主要成果:
- RBP2具有很高的亲和力与非常长链不和的2-MAG结合,将视网醇从相同的结合口袋中取代,并将其确立为生理上相关的内分泌大麻素结合蛋白.
- 在口服脂肪挑战后,Rbp2-null小鼠在靠近小肠中表现出高水平的2-AG和依赖葡萄糖的胰岛素型多 (GIP),这表明与肥胖有关.
- 在肠道K细胞和胰腺α细胞的分泌颗粒中发现RBP4,与GIP和葡萄糖分别共同分泌,涉及到代谢激素调节.
结论:
- RBP2 作为视网体和内分泌大麻素信号传递的关键联系,通过与2-MAG的相互作用和随后对GIP分泌的影响,影响代谢途径.
- RBP4与GIP和葡萄糖的共同分泌提供了一个解释其对RBP4过度表达模型中观察到的代谢功能障碍的贡献的机制.
- 这些发现揭示了RBP2和RBP4在代谢调节中的新作用,突出了肥胖和相关代谢疾病的潜在治疗点.
关键词:
2 - - 单一基甘油.类似葡萄糖-1 (GLP-1) 的葡萄糖-1 (GLP-1)葡萄糖依赖的胰岛素型多 (GIP)增加了一次.肥胖问题 肥胖问题雷蒂诺酸是什么意思 雷蒂诺酸是什么意思视网类药物 视网类药物雷丁醇结合蛋白是什么意思视网醇结合蛋白2 (RBP2) 是一种视网醇结合蛋白4 (RBP4或RBP) 是一种维生素A 维生素A是一种维生素.更多相关视频
相关概念视频
01:31Transducer Mechanism: Nuclear Receptors
1.3K
Nuclear receptors, or NRs, are unique transcription factors that regulate gene transcription and affect the cellular pathways involved in reproduction, development, or metabolism. Their ability to be stimulated by small lipophilic ligands and control vital cellular processes makes them ideal drug targets. Nearly 10-15% of currently prescribed drugs target these receptors.
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:
1.3K
01:20The Retinoblastoma Gene
4.1K
Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...
4.1K
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
01:28Insulin: The Receptor and Signaling Pathways
1.2K
Insulin action is mediated through a receptor tyrosine kinase, akin to the IGF-1 receptor. The number of receptors per cell varies significantly, from 40 on erythrocytes to 300,000 on adipocytes and hepatocytes. The insulin receptor consists of linked α/β subunit dimers, forming a heterotetramer glycoprotein with two extracellular α subunits and two β subunits spanning the membrane. The α subunits inhibit the inherent tyrosine kinase activity of the β subunits, but...
1.2K
01:23Negative Regulator Molecules
35.2K
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
35.2K
01:24Overview of Lipid Metabolism
1.2K
Lipid metabolism is a crucial process in the human body that involves the synthesis and degradation of lipids. This process is essential for energy production, cell membrane formation, and hormone production, among other functions.
Lipolysis: The Breakdown of Lipids:
Lipolysis is the process of breaking down lipids, particularly triglycerides, into glycerol and fatty acids. This process typically occurs in the adipose tissue and is triggered by various hormones, including glucagon and...
Lipolysis: The Breakdown of Lipids:
Lipolysis is the process of breaking down lipids, particularly triglycerides, into glycerol and fatty acids. This process typically occurs in the adipose tissue and is triggered by various hormones, including glucagon and...
1.2K