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An immunogold-silver staining technique for detection of cell-surface antigens in cell suspensions was developed. Leukocyte cell suspensions were first incubated with monoclonal antibodies directed against cell-surface antigens and then with colloidal gold-labeled goat anti-mouse antibodies. Cytocentrifuge preparations of the cell suspensions were immersed in a physical developer containing silver lactate and hydroquinone as reducing substance. The preparations were then counterstained and mounted. In light microscopy, cells reacting with the monoclonal antibodies showed dark granules on their surface membrane. An optimal morphology, as revealed by a May-Grünwald-Giemsa counterstain, permitted accurate cell identification. The labeling was influenced by the gold particle diameter and the concentration of the gold reagents, by the duration of incubation in the physical developer, and by the composition and temperature of this medium. The T-cell subsets enumerated with this method in the peripheral blood of normal adults were identical to those found with other methods. The sensitivity of the technique was comparable with that of immunofluorescence microscopy. This immunogold-silver staining procedure proved to be a reliable tool for detection of cell-surface antigens in light microscopy.

An immunogold-silver staining method for detection of cell-surface antigens in light microscopy.