A Brief History

Another pioneer in immunochemistry was Svante Arrhenius, a Swedish physicist whose work in chemistry brought the two disciplines together in what is now known as the study of physical chemistry. Arrhenius published a book called Immunochemistry in 1907 describing the application of physical chemistry methods to the study of toxins and antitoxins. Some immunochemists use antibodies to label epitopes of interest in cells (immunocytochemistry, ICC) or tissues (IHC, immunohistochemistry).
ICC uses antibodies to target specific peptides or protein antigens in cells through their specific epitopes. Bound antibodies are detected using a number of technologies such as f luorescent tagging, chromogenic staining, and secondary antibodies. For example, immunof luorescence is combined with confocal microscopy for studying the location of proteins and dynamic processes in cells — something for which Invitrogen’s Molecular Probes division of Eugene, OR, is well known. ICC allows researchers to evaluate whether particular cells express a specific biomolecule and shows them which subcellular compartments are expressing it. Similarly IHC methods detect antigens in tissue sections.
Immunohistochemical staining is widely used in diagnosis of abnormal (e.g., cancerous) cells. Certain molecular markers are characteristic of cellular events such as proliferation or apoptosis. IHC helps researchers understand the distribution and localization of biomarkers and differentially expressed proteins in tissues.
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