Dual Immunohistochemistry Kit for Clear CK7 and Elastin Staining
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Solution Overview
Problem
Traditional immunohistochemistry techniques face challenges in clearly distinguishing between the brownish staining of CK7 in the cytoplasm of alveolar epithelial cells and the deep blue wavy staining of elastin fibers, making it difficult to accurately diagnose lung adenocarcinoma, particularly in cases of alveolar wall structure obscuration or tumor infiltration.
Innovation Solution
A reagent kit and staining method for dual immunohistochemistry using a combination of primary antibodies (rabbit anti-human CK7 and mouse anti-human CD34 monoclonal antibodies) with Victoria blue staining, allowing simultaneous detection of CK7 and CD34 antigens, along with a simplified staining process that includes Fast Red and DAB chromogenic agents, enhancing tissue morphology visualization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional immunohistochemistry staining is used with CK7 and elastin fiber double staining, then multiple antigens can be detected, but the contrast between brownish CK7 staining and deep blue elastin fiber staining is not clear enough
Solution Approach 1:
The patent changes the chromogenic agent for CK7 from DAB (brown) to Fast Red (red), creating a distinct color contrast with Victoria blue (deep blue) elastin fiber staining. This color change principle directly resolves the insufficient contrast issue between brown and deep blue stains, enabling clear visual differentiation of multiple targets on the same tissue section.
Solution Approach 2:
The patent applies different chromogenic agents (Fast Red for CK7, Victoria blue for elastin fibers) to different target antigens within the same tissue section. This local differentiation of staining qualities allows each antigen to be visualized with its own characteristic color, maintaining diagnostic clarity while detecting multiple targets simultaneously.
2Loss of information
If multicolor immunohistochemistry is performed to detect multiple antigens, then diagnostic information is enhanced, but the complexity of the staining process increases
Solution Approach 1:
The patent combines elastin fiber staining (Victoria blue) with dual immunohistochemistry staining (Fast Red and DAB) into a single integrated staining protocol. By merging these previously separate procedures into one unified process, the patent reduces the number of separate staining steps while maintaining the ability to detect multiple antigens and visualize elastin fibers simultaneously, thus enhancing diagnostic information without proportionally increasing complexity.
Solution Approach 2:
The staining protocol is designed to serve multiple functions simultaneously: detecting CK7 antigen, detecting elastin fibers, and visualizing tissue morphology all in one process. This multi-functionality allows a single staining procedure to provide comprehensive diagnostic information that would otherwise require multiple separate assays, reducing overall procedural complexity.
3Loss of information
If multiple primary antibodies are used for dual immunohistochemistry, then multiple antigens can be detected, but the sample requirement increases
Solution Approach 1:
The patent combines the detection of multiple antigens (CK7 and elastin fibers) on the same tissue section using a single biopsy sample. By merging multiple detection functions into one assay performed on one sample, the patent eliminates the need for multiple separate biopsies or sections, thus reducing the total sample requirement while maintaining comprehensive antigen detection capability.
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
The method provides clear visualization of tumor epithelium growth patterns and elastin fiber integrity, improving diagnostic accuracy and consistency by reducing sample requirements and experimental complexity, and enabling objective assessment of lung adenocarcinoma conditions.
Implementation Method 1
This technique is based on the antigen-antibody reaction principle in immunology, where a chromogenic agent labeled on the antibody undergoes a chemical reaction
Implementation Method 2
The secondary antibody reagent includes: 1) A secondary antibody polymer reagent labeled with horseradish peroxidase from one species and a secondary antibody polymer reagent labeled with alkaline phosphatase from another species
Implementation Method 3
where a chromogenic agent labeled on the antibody undergoes a chemical reaction, allowing for the localization, qualitative, and relative quantitative study of antigens within tissue cells
Implementation Method 4
After hematoxylin counterstaining and bluing, Victoria blue staining is applied directly
Implementation Method 5
the deep blue wavy staining of elastin fibers with Victoria blue
Data Source
AI summary
A reagent kit, staining method, and application for combining dual immunohistochemistry with elastin fiber staining. The reagent kit includes a combination of primary antibodies, consisting of anti-CK7 and anti-CD34 monoclonal antibodies from different species, such as rabbit anti-human CK7 monoclonal antibody and mouse anti-human CD34 monoclonal antibody. By selecting CK7 and CD34 as the primary antibody combination, the growth pattern of tumor epithelium can be accurately indicated, and the proliferation and thickening of alveolar septal fibrous tissue caused by tumors can be clearly revealed, as opposed to structural changes of alveoli induced by other factors. Combined with independent Victoria blue staining, the elastin fibers of the walls of arteries and veins, as well as the pleura of the lungs, can be clearly visualized, aiding in the assessment of the integrity of elastin fibers on the lung surface and in determining the extent of tumor infiltration.