Multi fluorescence immunohistochemical detection

　　Multi fluorescence immunohistochemical detectionThe main technical principle is derived from the Signal Amplification (TSA) technology of casein amide. TSA is an enzymatic detection method that utilizes horseradish peroxidase (HRP) for high-density in situ labeling of target proteins or nucleic acids. This technology utilizes the peroxidase reaction of tyramine Tyramide to produce a large amount of enzymatic products at the antigen antibody binding site. These products bind to surrounding protein residues, which in turn bind to fluorescent groups, resulting in geometric amplification of the detection signal. This technology is compatible with high-performance dyes such as Alexa Fluor and traditional fluorescent dyes, enabling multiple fluorescent labeling.

Multi fluorescence immunohistochemistry technology is widely used in multiple fields:

　　single-cell analysisAbility to simultaneously detect the expression of multiple proteins at the single-cell level.

　　Chip analysisRealize high-throughput multiplex protein detection on biochips.

　　Organizational Form and Functional AnalysisStudy the spatial distribution and interrelationships of different proteins in organizations.

　　Tumor microenvironment analysisPanoramic analysis of tumor immune infiltration, immune checkpoints, and spatial relationships between tumor cells and immune cells.

　　Analysis of Autoimmune DiseasesExploring the pathogenesis and progression of autoimmune diseases.

　　Exclusion reaction assessmentMonitor and evaluate immune rejection reactions.

The general steps of multiplex fluorescence immunohistochemistry detection are as follows:

　　samplingTo obtain the tissue sample to be tested, the slicing method is usually used.

　　fixed processingFix tissue samples with substances such as formaldehyde or ethanol to maintain their morphological structure.

　　slice processingCut the fixed tissue into thin slices, usually with a thickness of 4-5 microns.

　　antibody labelingSelect specific antibodies to label the target protein, which typically bind to substances such as fluorescein or enzymes.

　　TSA amplificationUsing TSA technology for signal amplification, a large amount of fluorescein is deposited at the antigen antibody binding site.

　　Dyeing treatmentBinding of labeled antibodies to specific tissue cells through fluorescence staining method.

　　Image acquisition and analysisCollect images using a fluorescence microscope or confocal microscope and perform quantitative and qualitative analysis.

The image analysis methods of multiple fluorescence immunohistochemistry include:

　　qualitative analysisBy observing the distribution and intensity of fluorescence signals, determine the expression and localization of target proteins in tissues.

　　quantitative analysisQuantify fluorescence signals using image processing software and compare protein expression differences under different samples or conditions.

　　co-localization analysisAnalyze the spatial relationship between different fluorescent signals and explore the interactions and co localization between proteins.

Through these analytical methods,Multi fluorescence immunohistochemical detectionTechnology can provide rich biological information, which helps to gain a deeper understanding of the physiological and pathological processes of cells.