Fixation Permeabilization
Fixation Permeabilization - Related Videos
08:53
Whole Animal Perfusion Fixation for Rodents
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Cited by 531 •
2012
Here we describe a low-cost, rapid, controlled and uniform fixation procedure using 4% paraformaldehyde perfused via the vascular system: through the heart of the rat to obtain the best possible preservation of the brain.
05:30
Live-cell Imaging of Lysosomal Membrane Permeabilization During Necroptosis
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2025
This protocol describes a live-cell imaging method for monitoring lysosomal membrane permeabilization during necroptosis, utilizing fluorescent probes that detect changes in lysosomal membrane integrity and acidification.
10:34
The Fabrication and Operation of a Continuous Flow, Micro-Electroporation System with Permeabilization Detection
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Cited by 4 •
2022
This protocol describes the microfabrication techniques required to build a lab-on-a-chip, microfluidic electroporation device. The experimental setup performs controlled, single-cell-level transfections in a continuous flow and can be extended to higher throughputs with population-based control. An analysis is provided showcasing the ability to electrically monitor the degree of cell membrane permeabilization in real-time.
01:03
Fixation and Sectioning
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2023
Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens. The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...
06:17
Measuring Mitochondrial Substrate Flux in Recombinant Perfringolysin O-Permeabilized Cells
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Cited by 1 •
2021
In this work, we describe a modified protocol to test mitochondrial respiratory substrate flux using recombinant perfringolysin O in combination with microplate-based respirometry. With this protocol, we show how metformin affects mitochondrial respiration of two different tumor cell lines.
FAQs
Excessive fixation can mask epitopes, the specific molecular features recognized by antibodies, even when it preserves overall cellular structure. Chemical cross-linking may restrict antibody access or alter how a protein is presented. As a result, samples can show weaker intracellular staining despite intact organization, making fixation control crucial for reliable antigen localization and comparison.
Detergents and organic solvents increase access by partially disrupting lipid membranes and creating pores. This opening allows probes and antibodies to reach intracellular targets, but the same disruption can become damaging when conditions are too harsh. Excessive treatment may distort morphology or remove soluble components, reducing the reliability of visual interpretation and quantitative measurements.
Optimization balances structural preservation against molecular access. Fixation must stabilize the sample sufficiently for cell organization to remain interpretable, while permeabilization must open membranes enough for probes and antibodies to reach intracellular targets. If either step is too mild or too harsh, the resulting image may underrepresent antigen distribution, morphology, or soluble cellular content.
A useful workflow treats stabilization and access as linked stages: first preserve the cellular architecture through fixation, then create membrane openings through permeabilization, followed by probe or antibody-based detection and microscopy. Keeping these stages conceptually separate helps investigators identify whether weak signal reflects limited access or whether structural changes arose during sample preparation.
Treatment choices depend on the measurement goal. Chemical cross-linking stabilizes proteins and membranes, whereas detergents or organic solvents provide the membrane disruption needed for intracellular labeling. Conditions should be adjusted to avoid both epitope masking and loss of soluble components. This balance is especially important when images will support localization studies or quantitative analysis.
Researchers apply this preparation to immunofluorescence staining, intracellular antigen detection, and microscopic analysis of cell organization. The resulting samples can support localization studies by showing where targets occur within cells, while quantitative imaging can compare signal or organization across samples. In biomedical research, careful optimization helps distinguish biological patterns from preparation-induced damage.