title: Identification of target antigens of antiendothelial cell antibodies against human brain microvascular endothelial cells in healthy subjects.
abstract: Antiendothelial cell antibodies (AECAs) have been detected in patients who have autoimmune and inflammatory diseases. Previous studies showed that AECAs against human umbilical vein endothelial cells were detected in healthy subjects. In the present study, we evaluated AECAs against human brain microvascular endothelial cells (HBMEC) in serum. We detected 250 antigen spots that reacted with AECAs in serum samples from 30 healthy subjects by 2-dimensional immunoblot using primary cultured HBMEC as the antigen source. There were 10 spots that corresponded to common target antigen spots and reacted with AECAs in serum samples from > 25% of the 30 healthy subjects. We identified 7 proteins that corresponded to 8 of the 10 spots by mass spectrometry: 78-kDa glucose-regulated protein, dihydropyrimidinase-related protein 2, heterogeneous nuclear ribonucleoprotein L, vimentin, perilipin 3, alpha-enolase, and annexin A2. The results suggest that these 7 HBMEC proteins are major target antigens of natural AECAs.
authors.forename: Akio
authors.initials: A
authors.lastname: Kimura
authors.forename: Takeo
authors.initials: T
authors.lastname: Sakurai
authors.forename: Nobuaki
authors.initials: N
authors.lastname: Yoshikura
authors.forename: Akihiro
authors.initials: A
authors.lastname: Koumura
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Hayashi
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Ohtaki
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Chousa
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Seishima
authors.affiliation: Department of Neurology and Geriatrics, Gifu University Graduate School of Medicine, Gifu, 1-1 Yanagido, Gifu 501-1194, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Inuzuka
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001323:Autoantibodies / Q000097:blood* / Q000378:metabolism; D001921:Brain / Q000166:cytology*; D055664:Electrochemical Techniques; D015180:Electrophoresis, Gel, Two-Dimensional; D004730:Endothelium, Vascular / Q000166:cytology* / Q000378:metabolism*; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D008297:Male; D013058:Mass Spectrometry; D008875:Middle Aged; D055815:Young Adult
chemical_list: D001323:Autoantibodies; C087589:anti-endothelial cell antibody