Immunohistochemistry

Immunohistochemistry (IHC) is a powerful technique used in biomedical research and pathology to visualize and localize specific proteins or antigens within tissue sections. It involves the use of antibodies that specifically bind to target proteins of interest, followed by detection and visualization of the antibody-antigen complexes using various labeling methods. The process of immunohistochemistry begins with tissue fixation, embedding, and sectioning to prepare thin slices of tissue suitable for microscopic analysis. These tissue sections are then mounted onto glass slides and subjected to antigen retrieval methods, such as heat-induced epitope retrieval or enzymatic digestion, to enhance antigen accessibility and antibody binding. Next, the tissue sections are incubated with primary antibodies that recognize and bind to the target proteins within the tissue. The primary antibodies are typically produced in animals, such as mice, rabbits, or goats, and are selected based on their specificity and affinity for the target antigen. After incubation, unbound antibodies are washed away to remove nonspecific binding. To visualize the bound antibodies and the target antigens, secondary antibodies conjugated to detection labels, such as fluorescent dyes, enzymes, or colloidal gold particles, are applied to the tissue sections. These secondary antibodies bind to the primary antibodies and amplify the signal, allowing for sensitive detection and localization of the target proteins within the tissue.