title: Co-localization of beta/A4 and cystatin C in cortical blood vessels in Dutch, but not in Icelandic hereditary cerebral hemorrhage with amyloidosis.
abstract: Based on the recent discovery of co-localization of beta/A4 and cystatin C in cortical blood vessels of patients with cerebral hemorrhages due to sporadic amyloid angiopathy and patients with Alzheimer's disease we investigated the presence of these two proteins in the cortical blood vessels of patients suffering from hereditary cerebral hemorrhage with amyloidosis of the Dutch (n = 11) and the Icelandic (n = 2) type. The brains of three patients with sporadic cerebral amyloid angiopathy were also investigated. Blood vessels of the Dutch patients clearly showed immunostaining with beta/A4 as well as with cystatin C antibodies, whereas the blood vessels of Icelandic patients showed only staining with cystatin C. In one of the three sporadic amyloid angiopathy patients co-localization was shown as well. The co-localization of mutated beta/A4 with normal cystatin C in the Dutch patients suggests that cystatin C deposition occurs secondarily to beta/A4 deposition. This is probably also the case in sporadic amyloid angiopathy and Alzheimer's disease. Cystatin C deposition may play a role in the development of cerebral hemorrhages and leukoencephalopathy.
authors.affiliation: Department of Neurology, University Hospital Leiden, The Netherlands.
authors.forename: J
authors.initials: J
authors.lastname: Haan
authors.forename: M L
authors.initials: ML
authors.lastname: Maat-Schieman
authors.forename: S G
authors.initials: SG
authors.lastname: van Duinen
authors.forename: O
authors.initials: O
authors.lastname: Jensson
authors.forename: L
authors.initials: L
authors.lastname: Thorsteinsson
authors.forename: R A
authors.initials: RA
authors.lastname: Roos
mesh_terms: D000368:Aged; D016564:Amyloid beta-Protein Precursor / Q000097:blood*; D001921:Brain / Q000503:physiopathology; D016657:Cerebral Amyloid Angiopathy / Q000150:complications / Q000235:genetics* / Q000503:physiopathology; D002543:Cerebral Hemorrhage / Q000150:complications / Q000235:genetics* / Q000503:physiopathology; D002869:Chromosome Aberrations; D025063:Chromosome Disorders; D002890:Chromosomes, Human, Pair 20; D015891:Cystatins / Q000097:blood* / Q000134:cerebrospinal fluid; D005260:Female; D006801:Humans; D007055:Iceland; D008297:Male; D008875:Middle Aged; D009426:Netherlands; D017354:Point Mutation
chemical_list: D016564:Amyloid beta-Protein Precursor; D015891:Cystatins