在缺血/再和炎症期间,微泡在微循环中的持久性是由因特林和补充介导的对激活白细胞的粘附引起的
J R Lindner1, M P Coggins, S Kaul
1Cardiovascular Division, University of Virginia School of Medicine, Charlottesville, VA 22908, USA. jlinder@virginia.edu
Circulation
|February 15, 2000
概括
缺血/再输血后微泡持续存在是由于与激活的白细胞结合. 这一发现可能有助于使用对比增强超声波检测炎症性疾病.
科学领域:
- 心血管研究研究心血管研究
- 微循环生理学 微循环生理学
- 炎症反应 炎症反应
背景情况:
- 用于对比性回声心脏成像的专微泡在缺血/再输血 (I-R) 后仍然存在心脏的微循环中.
- 这种微泡持续存在的确切机制目前尚不清楚.
研究的目的:
- 为了研究微泡在缺血/反 (I-R) 和炎症后的微循环中持续存在的机制.
- 确定白细胞粘附在微泡保留中的作用.
主要方法:
- 肠道显微镜被用来观察小泡粘附在老鼠的肌肉微循环.
- 在基线,I-R后和TNF-alpha注射后注射了微泡 (白蛋白,离子脂,阴性脂).
- 进行了流细胞测量和阻断研究 (β2 - 整蛋白Mac-1,补充物枯竭),以确定结合机制.
主要成果:
- 与基线相比,在I-R和TNF-alpha治疗后,微泡粘附率显著增加.
- 微泡附着与附着白细胞的数量有很强的相关性.
- 通过阻断β(2) - 整合素Mac-1抑制了胺微泡结合;在补充物枯竭血清中减少了脂质微泡结合.
结论:
- 在I-R和炎症期间,微气泡的微血管附着通过通过β(2) -整合素和补充通路与激活的白细胞结合.
- 微泡持续性可以作为检测和监测在炎症条件下白细胞粘附的标记.
更多相关视频
12:55A Microphysiological System to Study Leukocyte-Endothelial Cell Interaction during Inflammation
Published on: December 9, 2021
3.0K
07:05Visualization of Neutrophil Extracellular Traps in Mesenteric Venules After Mesenteric Ischemia-Reperfusion Injury via Intravital Microscopy
Published on: September 27, 2024
937
相关概念视频
Inflammation
46.6K
Overview
46.6K
Intracellular Signaling Affects Focal Adhesions
2.8K
Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Some...
2.8K
Adherens Junctions
5.8K
Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types – adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
Adherens Junctions are Dynamic
Adherens Junctions are Dynamic
5.8K
Immunoglobulin-like Cell Adhesion Molecules
3.3K
Immunoglobulin-like cell adhesion molecules or Ig-CAMs are a versatile group of cell surface glycoproteins belonging to the immunoglobulin protein superfamily. Ig-CAMs possess the characteristic immunoglobulin protein domains and other domains such as the fibronectin type III domain. The Ig domains are glycosylated to varying degrees in different Ig-CAMs.
Ig-CAMs exhibit either homophilic binding (to other Ig-CAMs) or heterophilic binding (to other ligands such as integrins). While most Ig-CAMs...
Ig-CAMs exhibit either homophilic binding (to other Ig-CAMs) or heterophilic binding (to other ligands such as integrins). While most Ig-CAMs...
3.3K
Acute Inflammation I: Cellular Phase
82
The cellular phase of acute inflammation is a tightly orchestrated sequence of events that recruits leukocytes, primarily neutrophils, to sites of tissue injury or infection. Following the initial vascular changes, this phase ensures effective immune cell migration, activation, and function at the affected site to eliminate pathogens and initiate tissue repair.Leukocyte Recruitment CascadeLeukocyte recruitment happens in four steps: margination, adhesion, transmigration, and chemotaxis. Reduced...
82
Chronic Inflammation: Introduction
41
Chronic inflammation is a prolonged, dysregulated immune response that persists for weeks to years when the inciting stimulus is difficult to eradicate or when self‑antigens drive ongoing reactivity. Morphologically, it is defined by mononuclear cell infiltration, progressive tissue destruction, and concurrent attempts at healing via angiogenesis and fibrosis. Compared with acute inflammation, edema is less prominent while cellular infiltration predominates; triggers include persistent...
41
