The distribution of α1-antichymotrypsin and amyloid production in the brain in Alzheimer’s disease

In this immunohistopathological study α1-antichymotrypsin, which is barely demonstrable in the normal brain, was found in amyloid fibrils, endothelial cells and the cytoplasm of astroglial cells in brains from patients with Alzheimer’s disease. Amyloid precursors stained with methenamine silver were arrayed mainly along the membranes, and amyloid fibrils, which stained densely with anti-α1-antichymotrypsin, were in direct contact with the fibrous structures connecting with the membranes of vascular feet or astrocytic processes.