Vascular Permeability
Vascular Permeability - Related Videos
07:10
In Vivo Vascular Permeability Detection in Mouse Submandibular Gland
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Cited by 2 •
2022
In the present protocol, the endothelial barrier function of the submandibular gland (SMG) was evaluated by injecting different molecular weighted fluorescent tracers into the angular veins of test animal models in vivo under a two-photon laser-scanning microscope.
07:03
An in vivo Assay to Test Blood Vessel Permeability
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Cited by 335 •
2013
We are presenting an in vivo assay to test blood vessel permeability. This assay is based on intravenous injection of a dye and subsequent visualization of its diffusion into interstitial spaces.
06:37
An Assay for Permeability of the Zebrafish Embryonic Neuroepithelium
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Cited by 11 •
2012
We describe a live whole animal quantitative measurement for permeability of the embryonic zebrafish brain. The technique analyzes the ability to retain cerebrospinal fluid and molecules of different molecular weights within the neural tube lumen and quantifies their movement out of the ventricles. This method is useful for determining differences in epithelial permeability and maturation during development and disease.
07:41
High-Throughput Bioprinting Method for Modeling Vascular Permeability in Standard Six-well Plates with Size and Pattern Flexibility
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2024
We present a protocol for high-throughput production of vascular channels with flexible sizes and desired patterns on a standard six-well plate using 3D bioprinting technology, referred to as vessels-on-a-plate (VOP). This platform has the potential to advance the development of therapeutics for the disorders associated with compromised endothelium.
12:48
Microperfusion Technique to Investigate Regulation of Microvessel Permeability in Rat Mesentery
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Cited by 3 •
2015
The modified Landis technique enables paired measurement of the hydraulic conductivity of individual microvessels in the mesentery of normal and genetically modified rats under control and test conditions using microperfusion techniques. It provides a convenient method to evaluate mechanisms that regulate microvessel permeability and transvascular exchange under physiological conditions.
FAQs
Tight and adherens junctions form regulated contacts between endothelial cells, while the glycocalyx contributes an additional surface barrier. Together, these structures restrict movement from blood into surrounding tissue under normal conditions. Changes in junction integrity or glycocalyx-related barrier function can therefore increase leakage and contribute to clinically significant tissue fluid accumulation.
These signals can increase permeability through different effects on the endothelial barrier. Histamine and cytokines can loosen intercellular junctions, whereas vascular endothelial growth factor can also increase vesicular transport. The resulting movement of fluid, proteins, or cells depends on which endothelial process is affected, helping explain varied vascular responses during disease.
Permeability changes can arise from wider gaps between endothelial cells or from increased vesicular transport across the endothelial lining. These routes are not interchangeable: junctional loosening changes passage between cells, while vesicular transport changes movement through cells. Distinguishing them helps interpret how a vascular stimulus produces edema, inflammation, or other tissue effects.
The condition of endothelial junctions, the glycocalyx, and transport pathways all influence barrier behavior. Local signals, including histamine, cytokines, and vascular endothelial growth factor, can shift these components toward greater passage. Consequently, permeability may differ between healthy and affected regions, allowing local vascular responses to contribute to broader clinical disease patterns.
Clinical research assesses altered permeability to clarify how vascular changes relate to edema, inflammation, ischemic injury, and tumor progression. Measurements can also support evaluation of biomarkers and vascular-targeted therapies. The important outcome is not simply detecting leakage, but connecting permeability changes with disease mechanisms and the response to an intervention.
Permeability studies are useful when researchers need to evaluate treatments that target blood vessels or strategies designed to deliver drugs through the vascular barrier. They can reveal whether an intervention changes endothelial restriction or transport and whether that change is relevant to disease. This supports development of vascular-targeted therapies and delivery approaches.