The fluorescent dyes of the Enklife TSA kits have excellent anti-fade properties, so there is no need to avoid light under fluorescent lamps, and no need to operate in a dark environment during use. However, please avoid direct exposure of the kit to sunlight. Stained slides can usually be stored at 4℃ for 6 to 12 months.
The interaction between cancer and the host immune system mainly occurs in the reactive tissue stroma surrounding tumors, an area known as the Tumor Immune Microenvironment (TIME). The breakthrough clinical application of immune checkpoint inhibitors, particularly targeted therapies against Programmed Death Protein 1 (PD-1, a T-cell co-inhibitory receptor) and Programmed Death Ligand 1 (PD-L1, also known as B7-H1/CD274), has not only propelled cancer immunotherapy into a new era but also made functional analysis of TIME a core focus in both research and clinical settings. Precise characterization of TIME's cellular composition, functional states, and molecular interaction networks is a crucial prerequisite for screening predictive biomarkers for immunotherapy response. Furthermore, deeply clarifying the dual pro-cancer/anti-cancer mechanisms of various immune cells in TIME and their dynamic associations with tumor cells can provide core support for developing novel immunotherapeutic strategies. However, the high heterogeneity of TIME and the challenge of detecting low-abundance immune molecules pose severe challenges to traditional analytical techniques, urgently requiring highly sensitive, multiplex-targeted in situ detection tools to overcome this dilemma.
In the field of in situ protein detection in tissues, immunohistochemistry (IHC), conventional immunofluorescence (IF), and multiplex immunofluorescence (TSA) are the three most widely used technologies. All three are based on specific antigen-antibody binding, but they differ fundamentally in detection throughput, sensitivity, and spatial resolution capabilities, which directly determine their applicable scope in scientific research and clinical settings. This article will systematically analyze the differences between the three from three dimensions: technical core, key performance, and applicable scenarios, providing precise references for experimental design and technology selection.
Our TSA kit has a full range of product components, including TSA-labeled fluorophores, TSA dilution buffer, 3% H₂O₂, blocking solution, primary antibody dilution buffer, antibody elution buffer, HRP-goat anti-rabbit/mouse IgG, DAPI staining solution, and anti-fluorescence quenching mounting medium, providing users with a one-stop experimental solution and greatly enhancing experimental convenience.
Tyramide Signal Amplification (TSA) technology is a high-sensitivity in situ detection technique based on enzymatic catalytic reactions. Its core mechanism utilizes the highly efficient catalytic activity of horseradish peroxidase (HRP) to specifically and densely label target proteins or nucleic acid molecules in samples. As a key method to break through the sensitivity bottleneck of traditional detection technologies, TSA technology, through its unique signal amplification effect, can significantly enhance the intensity of target-related fluorescent signals in multiple core application scenarios such as immunocytochemistry (ICC), immunohistochemistry (IHC), and in situ hybridization (FISH). Compared with traditional detection methods, this technology can effectively capture low-abundance targets — including functionally expressed proteins, rare cell surface markers, low-copy nucleic acid fragments, and other target molecules that are difficult to detect with traditional methods, providing more precise and comprehensive detection solutions for life science research and clinical diagnosis, widely applicable to various sample types such as paraffin sections, frozen tissues, cell samples, and organoids.
The advent of Tyramide Signal Amplification (TSA) technology has provided an efficient signal amplification solution for fluorescence multiplex staining, effectively addressing many limitations faced by traditional technologies. Its core principle is that the primary antibody specifically binds to the target, and after the secondary antibody conjugated with horseradish peroxidase (HRP) binds to the primary antibody, tyramide molecules carrying fluorophores are introduced into the reaction system. Fluorescently labeled tyramide salts produce covalent binding sites under the condition of HRP-catalyzed hydrogen peroxide, thereby triggering a large number of enzymatic reactions. These reaction products can bind to surrounding proteins (such as proteins containing tryptophan, histidine, and tyrosine residues), accumulating a large amount of fluorophores at the antigen-antibody binding site, increasing the signal intensity by tens of times, allowing even low-abundance targets to be accurately detected.
Frozen section IHC is a technique that involves quickly freezing tissue samples and then using a cryostat to prepare ultrathin sections. These sections are subsequently stained with specific antibodies to target antigens. Compared with traditional paraffin - embedded section IHC, frozen section IHC has the advantages of being rapid and efficient and preserving more antigen activity. It is especially suitable for clinical situations that require rapid diagnosis and for the study of fresh tissue samples.
