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The use of immunofluorescence (IF) technique to detect and evaluate expression levels and localization of cellular proteins and other antigens of interest through the antibodies in their cellular or tissue context has become a standard approach among researchers. Optimizing primary antibody concentrations/dilutions is an essential step in the fluorescent antibody staining protocol. The steps in IF staining are similar to those of the immunohistochemistry (IHC) technique. The use of IHC technique to determine the optimal working dilutions of primary antibodies for IF staining of formalin-fixed paraffin-embedded (FFPE) tissues sections can minimize time wasting and cumbersome approach of using direct IF single labeling using variable dilutions of both primary and secondary antibodies. We used IHC staining technique to determine the working dilutions of the respective primary antibodies by staining 3-µm sections of recommended positive FFPE tissue sections using 3 different dilutions of the primary antibodies and an isotype control (used at the highest concentration). Digital images of sections stained were reviewed in ImageScope by a Consultant Pathologist for positivity, intensity, and histologic distribution. We adopted the IHC predetermined optimal dilutions of primary antibodies to CD4, CD8, CD16, CD21, CD56, CD68, CD163, FOXP3, and PD1 to carry out IF staining of FFPE tissue sections. This approach has helped to remove the complexities associated with grappling with 2 unknown to optimize for both the primary and secondary antibodies using IF technique.
Applied Immunohistochemistry & Molecular Morphology – Wolters Kluwer Health
Published: Mar 11, 2020
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