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Antigen detection with indirect immunohistochemical methods is hampered by high background staining if the primary antibody is from the same species as the examined tissue. This high background can be eliminated in unfixed cryostat sections of mouse skeletal muscle by boiling sections in PBS, and several proteins including even the low abundant dystrophin protein can then be easily detected with murine monoclonal antibodies. However, not all antigens withstand the boiling procedure. Immunoreactivity of some of these antigens can be restored by subsequent washing in Triton X-100, whereas immunoreactivity of other proteins is not restored by this detergent treatment. When such thermolabile proteins are labeled with polyclonal primary antibodies followed by dichlorotriazinylaminofluorescein-conjugated secondary antibodies and boiled, the fluorescence signal persists, and sections can then be processed with a monoclonal antibody for double immunostaining of a protein unaffected by boiling. This stability of certain fluorochromes on heating can also be exploited for double immunofluorescence labeling of two different thermostable proteins with murine monoclonal antibodies as well as for combination with Y-chromosome fluorescence in situ hybridization. Our method should extend the range of monoclonal antibodies applicable to tissues derived from the same species as the monoclonal antibodies.

journal of histochemistry and cytochemistry/the journal of histochemistry and cytochemistry

Reduction of High Background Staining by Heating Unfixed Mouse Skeletal Muscle Tissue Sections Allows for Detection of Thermostable Antigens With Murine Monoclonal Antibodies