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We established a triple-labeling method with two rabbit polyclonal antibodies and a mouse monoclonal antibody and examined autopsied brain tissue with cotton wool plaques (CWPs). One of the polyclonal antibodies was so diluted (anti-Aβ42 or anti-Aβ40/1:30,000 or anti-von Willebrand factor/1:1000) that its visualization was possible only after amplification with the catalyzed reporter deposition (CARD) method. The other polyclonal antibody (anti-Aβ40 or anti-Ap42/1:1000) was visualized with a fluorochrome conjugated to an anti-rabbit antibody that specifically visualized the latter polyclonal antibody because of its lower sensitivity. A monoclonal antibody, AT8, was superimposed to yield triple immunofluorolabeling. Serial optical sections with an interval of 0.3 μm were reconstructed to allow three-dimensional (3D) observation of these three epitopes. Aβ40 was localized to core-like structures, mainly in layers I–III, and was sometimes in contact with the vascular wall, both without neuritic reactions. CWPs, present in layers I–VI, were labeled with anti-Aβ42 and were accompanied by neuritic reactions. These differences suggest that mechanisms of Aβ deposition and its relation to neuritic reactions or to blood vessels differ according to the lesion, even in the same microscopic field.

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

Triple Immunofluorolabeling with Two Rabbit Polyclonal Antibodies and a Mouse Monoclonal Antibody Allowing Three-dimensional Analysis of Cotton Wool Plaques in Alzheimer Disease