在人体体内状细胞的可视化:微血管封闭形成和血液学指数
medRxiv : the preprint server for health sciences
|November 19, 2025
概括
状细胞疾病 (SCD) 涉及由红细胞 (RBC) 粘附于血管壁引起的血管封闭. 一种新的非侵入性成像技术揭示了红细胞是如何启动这些阻塞的,有助于理解和治疗SCD.
科学领域:
- 血液学 血液学 血液学
- 生物医学工程 生物医学工程
- 显微镜的使用方法
背景情况:
- 血管封闭是状细胞疾病 (SCD) 的标志,导致显著的发病率.
- 目前对闭塞形成的理解受限于缺乏人体体内体内成像技术.
- 观察个体血细胞动态对于阐明SCD病理生物学至关重要.
研究的目的:
- 开发和应用一种新的非侵入性成像技术,用于研究血液流动和状细胞的行为.
- 研究SCD患者微血管封闭形成的机制.
- 评估红细胞输血对SCD血管动态的影响.
主要方法:
- 使用斜背照明显微镜 (OBM) 进行高分辨率,无标签的子舌毛细血管成像.
- 在十个患有SCD (输血前和输血后) 和十个健康对照人群中比较了微血管动态.
- 量化了血液流动速度 (快速,缓慢,没有流动),并计算了观察到的毛细血管中的附着红细胞 (RBC).
主要成果:
- 与对照组相比,患有SCD的个体表现出明显较少的快速流动血管,更多的无流动血管,以及更多的坚持RBC.
- 红细胞,通常是形的,被观察到附着在内皮,启动血管阻塞.
- 在接受红细胞输血后,SCD患者的血管流量增加,血管流量减少,并减少附着的红细胞.
结论:
- 这种新的OBM技术成功地可视化了体内血液细胞动态和SCD中的微血管封闭.
- 来自OBM的血液学指数有效地捕捉了输血引起的血管功能变化.
- 在研究血管封闭病理生物学,评估治疗方法和个性化SCD治疗方面,OBM显示出前景.
相关概念视频
00:49The Blood-brain Barrier
Overview
01:20Overview of the Vascular System
The vascular system comprises an extensive network of arteries, capillaries, and veins. The vascular system can be broadly divided into the blood and lymphatic systems. Typically, blood vessels can be categorized into three histological regions: tunica intima, tunica media, and tunica adventitia. The tunica intima consists of a single layer of endothelial cells attached to the basal lamina. Underlying the basal lamina is a connective tissue layer and an elastic lamina that gives stability and...
01:20Fluid Connective Tissues: Blood and Lymph
Blood and lymph are fluid connective tissues. They contain cells, also known as formed elements, circulating in a liquid extracellular matrix, the plasma. The formed elements are derived from hematopoietic stem cells in the bone marrow. Blood and lymph connect all vital parts and carry nutrients, oxygen, and other essential molecules like antibodies.
Blood
The blood flows through blood vessels— arteries, capillaries, and veins. Blood plasma is primarily made of proteins, solutes, and water.
Blood
The blood flows through blood vessels— arteries, capillaries, and veins. Blood plasma is primarily made of proteins, solutes, and water.
01:15Structure of Blood Vessels
Blood is circulated throughout the human body through a network of blood vessels called the circulatory system. This system includes arteries that transport blood from the heart to various body parts. These arterial pathways divide into smaller vessels until they reach the arterioles, which further split into capillaries. It is within these minuscule capillaries that the exchange of nutrients and waste products takes place. After this exchange, the blood is collected by venules, which fuse to...
01:20Capillaries and Their Types
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, with...