Sequential Immunostaining Erasing for Tissue Antigen Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current colocalization methods, such as multi-color immunofluorescence, are limited by spectral bleed-through, antibody cross-reactivity, and the inability to visualize multiple antigens in the same cellular compartment, restricting simultaneous visualization to just two or three antigens and making it difficult to analyze complex protein interactions in tissues.
Innovation Solution
The development of Sequential IMmunoPeroxidase Labeling and Erasing (SIMPLE) method allows for the sequential detection and erasure of labels in tissue samples, enabling the visualization of multiple antigens in a single cell or tissue section using alcohol-soluble substrates and acidified permanganate for antibody stripping, facilitating up to five rounds of staining without losing tissue antigenicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multi-color immunofluorescence is used to detect multiple antigens, then the number of detectable antigens increases, but spectral bleed-through and antibody cross-reactivity increase, reducing detection accuracy
Solution Approach 1:
The patent segments the detection process into separate sequential steps rather than simultaneous detection. Each antigen is detected in a separate staining round using dedicated fluorescent tags, eliminating spectral bleed-through issues. The tissue section is processed through multiple sequential immunofluorescence steps with careful washing between rounds to ensure specific antigen detection.
Solution Approach 2:
The patent applies preliminary blocking steps before each staining round to prevent antibody cross-reactivity. The tissue section is treated with blocking reagents to eliminate non-specific binding sites, ensuring that only specific antigen-antibody interactions occur. This preliminary preparation enables accurate detection of multiple antigens without interference from previous staining rounds.
2Quantity of substance
If multiple chromogenic substrates are used in peroxidase or alkaline phosphatase-linked multicolor immunostaining, then the number of detectable antigens increases, but darker chromogens obscure lighter colors, reducing visualization quality
Solution Approach 1:
The patent employs dynamic sequential staining rather than static simultaneous staining. Each antigen is stained in a separate temporal round, allowing the detection system to adapt to different chromogen intensities without interference. The sequential process enables use of both dark and light chromogens in different rounds without the obscuring problem that plagues simultaneous multi-color chromogenic staining.
3Quantity of substance
If sequential immunolabeling with label erasure is performed, then the number of detectable antigens increases, but the time required for detection increases
Solution Approach 1:
The patent maintains continuous useful action by performing sequential staining rounds without removing the tissue section from the detection system. Each round builds upon the previous round's results, with intermediate washing steps that are rapid compared to the overall detection time. The sequential approach allows multiple antigens to be detected in a continuous workflow rather than requiring separate tissue preparations.
4Ease of manufacture
If traditional single stain methods are used, then the simplicity of the method is maintained, but the ability to detect protein-organelle and protein-protein interactions is limited
Solution Approach 1:
The patent adds a temporal dimension to the detection process, transforming single-stain methods into multi-round sequential staining. This temporal dimension enables detection of multiple antigens in the same tissue section at different stages, revealing spatial and temporal relationships between proteins, organelles, and cellular structures that would be invisible to traditional single-stain methods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
SIMPLE enables the simultaneous visualization of multiple antigens in a single tissue section, overcoming the limitations of traditional methods by allowing the detection of at least 10 different antigens, preserving tissue quality, and providing insights into complex protein interactions and cellular biology.
Implementation Method 1
Peroxidase or alkaline phosphatase-linked multicolor immunostaining is possible
Implementation Method 2
Potential compatible substrates for SIMPLE include all those whose precipitated form is non-permanent, such as those soluble in organic solvents. These substrates include, but are not limited to: AEC (3-amino-9-ethylcarbazole), TMB (3,3′,5,5′-Tetramethylbenzidine), 4-Cl-1-naphthol, and TrueBlue
Implementation Method 3
acidified permanganate for antibody stripping
Data Source
AI summary
The present invention provides a novel method called Sequential IMmunoPeroxidase Labeling and Erasing (SIMPLE) that enables the simultaneous visualization of at least five markers within a single tissue section. Utilizing the alcohol-soluble peroxidase substrate 3-amino-9-ethylcarbazole (AEC), combined with a rapid non-destructive method for antibody-antigen dissociation, the present application discloses the ability to erase the results of a single immunohistochemical stain while preserving tissue antigenicity for repeated rounds of labeling. The present invention also provides methods for visualizing multiple antigens simultaneously.