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.
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...
10:21
Protocol for HER2 FISH Using a Non-cross-linking, Formalin-free Tissue Fixative to Combine Advantages of Cryo-preservation and Formalin Fixation
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Cited by 3 •
2017
Fluorescence in-situ hybridization (FISH) is often required in combination with histopathology and molecular diagnostics for selection of therapy in personalized medicine. A novel non-cross-linking, formalin-free tissue fixative that allows high quality morphologic, molecular and FISH analyses from the same specimen by addition of a post-fixation step before FISH is presented.
06:57
Instillation and Fixation Methods Useful in Mouse Lung Cancer Research
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Cited by 48 •
2015
The goal of this paper is to describe simple methods that will greatly aid in the setup and analysis of mouse lungs with lung cancer or other pathologies. We present 3 protocols to simply and reliably carry out lung instillations, fixation, and lung volume measurements.
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.