title: Demonstration of puromycin-sensitive alanyl aminopeptidase in Alzheimer disease brain.
abstract: Puromycin-sensitive alanyl aminopeptidase (PSA, EC 3.4.11.14) is a member of the ubiquitous aminopeptidase family, which cleaves N-terminal amino acids from proteins. PSA is suggested to function as a trimming protease in the MHC class I pathway, which is activated in brains of Alzheimer disease (AD). We examined the immunohistochemical localization of PSA in brains of AD and control cases using a rabbit anti-PSA. In the control cases, the antiserum revealed staining in a few glial cells and blood vessels. In AD brain, however, intensely stained cells were found richly in the cerebral cortex. Double immunofluorescence studies confirmed that PSA-positive cells were reactive microglia. Such PSA-positive reactive microglia tended to locate in and around senile plaques and were sometimes observed to associate with neurons containing neurofibillary tangles. The present result indicates that reactive microglia express PSA-immunoreactive molecules, probably in association with the pathological conditions of AD.
authors.affiliation: Molecular Neuroscience Research Center, Shiga University of Medical Science, Tsukinowachoo 18-1, Otsu, Shiga 520-2192, Japan. minnasch@belle.shiga-med.ac.jp
authors.forename: Petra
authors.initials: P
authors.lastname: Minnasch
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Yamamoto
authors.forename: Iwao
authors.initials: I
authors.lastname: Ohkubo
authors.forename: Katsuji
authors.initials: K
authors.lastname: Nishi
mesh_terms: D000544:Alzheimer Disease / Q000201:enzymology* / Q000473:pathology; D001921:Brain / Q000201:enzymology* / Q000473:pathology; D018826:CD13 Antigens / Q000378:metabolism*; D016022:Case-Control Studies; D006801:Humans; D007150:Immunohistochemistry; D011691:Puromycin / Q000494:pharmacology*
chemical_list: D011691:Puromycin; D018826:CD13 Antigens