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Published on: March 21, 2018
Processing of cytological specimens
1Department of Gynecologic and Breast Pathology, Armed Forces Institute of Pathology, Washington, DC, USA.
Insights
This study details methods for preparing individual cells for antibody staining. Optimized fixation and permeabilization techniques improve antibody penetration for accurate cell analysis.
Area of Science:
- Cell Biology
- Immunohistochemistry
- Biotechnology
Background:
- Individual cell analysis is crucial in various biological and medical fields.
- Current methods for preparing cells for antibody staining can be challenging.
- Efficient antibody penetration is key for accurate cellular examination.
Purpose of the Study:
- To outline a standardized protocol for preparing diverse cell samples for antibody-based analysis.
- To enhance antibody accessibility into cells for improved detection.
- To provide a reliable method for single-cell examination.
Main Methods:
- Cells isolated from fluid, mucus, or tissue were prepared as smears, touch preparations, or cytocentrifuge concentrates.
- Fixation was performed using non-denaturing solutions (e.g., acetone, alcohol-based) or formalin.
- Permeabilization was achieved using buffers with Triton X-100 and dimethylsulfoxide (DMSO).
- Endogenous peroxidase activity was quenched using hydrogen peroxide.
- Non-specific binding was blocked using normal serum.
Main Results:
- The described methods yield well-preserved cell preparations suitable for antibody staining.
- Enhanced antibody penetration was observed due to optimized permeabilization.
- Reduced background staining was achieved through effective blocking procedures.
- The protocol is adaptable to various cell sources and preparation techniques.
Conclusions:
- This protocol provides a robust method for preparing individual cells for antibody detection.
- The techniques described facilitate improved antibody accessibility and staining efficiency.
- These methods support accurate and reliable single-cell analysis in research and diagnostics.
Abstract:
Individual cells often need to be examined with antibodies apart from the surrounding tissue. They may be cells in fluid, cells encased in mucus from a swab, or cells directly extracted from a piece of tissue. Cells can be viewed on a glass slide as cell smears produced from a cell enriched source, introduced as a touch preparation from a piece of wet tissue, concentrated on a slide by the use of a cytocentrifuge, or applied directly to a slide from a solid medium such as a cotton swab. These cell preparations can then be optimally fixed in weakly or nondenaturing solutions such as acetone or those that are alcohol based. They can also be postfixed in formalin if desired. Incubation in buffers containing 0.25% Triton X-100 and 5% dimethylsulfoxide (DMSO) allow for easier antibody penetration. The endogenous peroxidase enzyme or oxidative compounds can be quenched in a mild hydrogen peroxide solution. The sections are then ready to test with antibody after an incubation in a normal serum solution blocks any available charged sites.
