Fluorescent Dextran Labeling
Fluorescent Dextran Labeling - Related Videos
07:35
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02:56
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11:12
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05:14
Assessment of Gut Barrier Integrity in Mice Using Fluorescein-Isothiocyanate-Labeled Dextran
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Cited by 22 •
2022
In the present study, fluorescein-isothiocyanate-labeled (FITC) dextran is administered to mice via oral gavage to evaluate intestinal permeability both in vivo and in plasma and fecal samples. As gut barrier function is affected in many disease processes, this direct and quantitative assay can be used in diverse research areas.
FAQs
Molecular weight is a key experimental variable because it changes how readily labeled dextran can move through biological barriers. Comparing dextrans of different sizes lets investigators evaluate size-dependent transport rather than treating fluorescence as a simple presence-or-absence signal. This comparison can reveal whether a barrier selectively restricts larger macromolecules or permits broader leakage.
The fluorescent tag converts dextran distribution into an optical signal, but interpretation depends on excitation and detection conditions. Researchers illuminate samples at wavelengths that excite the attached fluorophore and then use fluorescence microscopy to observe the emitted light. Signal location and intensity can therefore be related to labeled material in cells, tissues, or experimental organisms.
Movement patterns help separate ordinary transport from abnormal loss of vascular integrity. Localization within cells can indicate uptake or endocytosis, whereas fluorescence beyond a vessel or across a tissue boundary can indicate permeability or leakage. Thus, the same labeling strategy can provide different biological interpretations depending on where the signal appears.
A typical workflow begins by selecting labeled dextran, administering it to cells, tissues, or an experimental organism, and examining the resulting distribution with fluorescence microscopy. The observed pattern is then interpreted in relation to fluid transport, cellular uptake, vascular permeability, or macromolecular movement. This workflow links administration to spatially resolved biological observations.
In medical research, the method supports assessment of blood vessel integrity, tissue perfusion, and barrier function. Fluorescence patterns can show whether labeled material remains within an expected vascular or tissue compartment or spreads beyond it. These observations help characterize transport and permeability in disease models without reducing the analysis to a single bulk measurement.
When labeled dextran is administered to cells or tissues, fluorescence microscopy can track whether material enters cells and where it becomes distributed. Such localization provides evidence relevant to endocytosis, the process by which cells internalize extracellular material, and to broader studies of macromolecular movement. The approach therefore connects visible intracellular signal with uptake behavior.