肝脏的鼻状内皮细胞是血红蛋白清除的主要途径
Gabriela Zurawska1, Zuzanna Sas2, Aneta Jończy1
1International Institute of Molecular and Cell Biology in Warsaw, Warsaw, Poland.
EMBO reports
|January 6, 2026
概括
肝脏侧侧内皮细胞 (LSEC) 是红细胞破裂后血红素 (Hb) 的关键清除者. 这一发现揭示了一条从脏到肝脏的铁循环回收和血排毒的途径.
科学领域:
- 血液学 血液学 血液学
- 细胞生物学 细胞生物学
- 铁的新陈代谢 铁的新陈代谢
背景情况:
- 红细胞衰老导致脏中轻微的血红蛋白释放.
- 病态血解发生在各种疾病中,需要有效的血红蛋白清除.
- 目前的理解主要将血红蛋白排毒归因于巨细胞,而其他清除途径尚未探索.
研究的目的:
- 为了确定负责血红蛋白吸收和清除的主要细胞.
- 阐明参与血红蛋白代谢和铁循环的机制和途径.
- 了解肝脏阴侧内皮细胞 (LSEC) 在血红蛋白清理中的作用.
主要方法:
- 对LSEC的蛋白质组分析以识别功能特征.
- 在体内进行红细胞和血红蛋白输血检测.
- 评估铁代谢标志物,包括铁丁和肝丁.
- 在对红细胞溶解的反应中,LSECs的转录概况.
主要成果:
- 肝脏的鼻状内皮细胞 (LSECs) 主要通过巨细胞结合 (macropinocytosis) 吸收血红蛋白.
- LSECs 显示出血红素代谢,铁储存和抗氧化剂防御的蛋白质证据.
- 脏巨细胞进行红细胞分裂,而LSEC和库弗弗细胞分别清除血红蛋白和红细胞膜.
- 高血红蛋白负载诱导肝脏的铁保留,LSEC特定的Hmox1表达,并激活Bmp6-hepcidin轴,导致低血症.
结论:
- 认定LSECs是关键的血红蛋白清除剂,补充脏巨细胞的作用.
- 建立了一条从脏到肝脏的轴,用于铁循环和血红素排毒.
- 这一途径对于在血液溶解过程中管理血红蛋白过载至关重要.
相关概念视频
Hepatic Portal System
5.2K
The hepatic portal system, a critical part of our circulatory framework, transports nutrient-laden, deoxygenated blood from the gastrointestinal tract and spleen to the liver. This ingenious system plays an indispensable role in maintaining our body's metabolic equilibrium.
At its core, the hepatic portal vein is the result of a confluence of the superior and inferior mesenteric veins along with the splenic vein. Each of these veins has a unique role. The superior mesenteric vein is...
At its core, the hepatic portal vein is the result of a confluence of the superior and inferior mesenteric veins along with the splenic vein. Each of these veins has a unique role. The superior mesenteric vein is...
5.2K
Liver Histology
4.0K
The microscopic anatomy of the liver is a complex and intricate system that comprises numerous structural units known as liver lobules, each of which is comparable in size to a sesame seed. These hexagonal structures consist of plates of liver cells or hepatocytes, which are characterized by their versatility and abundance of cellular apparatus like rough and smooth ER, Golgi apparatus, peroxisomes, and mitochondria.
Hepatocytes perform a variety of essential functions. They secrete...
Hepatocytes perform a variety of essential functions. They secrete...
4.0K
Lifecycle of Erythrocytes
4.6K
Erythrocytes, also known as red blood cells, constantly move through blood capillaries. As a result, they damage their plasma membrane due to the continuous friction. Typically, after 100 to 120 days, erythrocytes become rigid and fragile as they wear out. As they pass through small vessels in the spleen and liver, they can get trapped and break apart into fragments.
The resident phagocytic macrophages deal with these damaged cells by engulfing them and separating their globin and heme groups....
The resident phagocytic macrophages deal with these damaged cells by engulfing them and separating their globin and heme groups....
4.6K
Hepatic Drug Clearance: Role of Transporters
295
In the liver and bile canaliculi, influx and efflux transporters modification can influence intrinsic clearance. Transporters play a significant role in moving drugs within liver cells. Elaborate models, such as the Biopharmaceutical Classification System (BCS), are essential to relate transporters to drug disposition. This system categorizes drugs into four classes based on solubility and permeability, providing insights into elimination routes and the effects of transporters following oral...
295
Capillaries and Their Types
7.3K
Capillaries, a crucial constituent of the circulatory system, are diminutive vessels with a diameter between 5–10 micrometers, accommodating perfusion to the tissues through the phenomenon known as microcirculation. Through their permeable walls, consisting of an endothelial layer ensconced by a basement membrane and sporadically dispersed smooth muscle fibers, the exchange of substances between the blood and the interstitial fluid becomes plausible. Variance in wall composition exists,...
7.3K
Effect of Hepatic Disease on Pharmacokinetics: Drug Dosing and Hepatic Blood Flow
210
Chronic liver disease significantly impacts drug metabolism due to alterations in hepatic blood flow and enzyme accessibility. This disruption affects the body's pharmacokinetics—the movement and processing of drugs within the system. Key enzymes crucial for metabolizing medications become less accessible, changing how drugs are processed and utilized. Furthermore, liver disease influences the synthesis of plasma proteins, such as albumin and globulins, which play critical roles in drug...
210


