title: Alterations of choroidal blood flow regulation in young healthy subjects with complement factor H polymorphism.
abstract: A common polymorphism in the complement factor H gene (rs1061170, Y402H) is associated with a high risk of age-related macular degeneration (AMD). In the present study we hypothesized that healthy young subjects homozygous for the high-risk haplotype (CC) show abnormal choroidal blood flow (ChBF) regulation decades before potentially developing the disease. A total of 100 healthy young subjects were included in the present study, of which 4 subjects were excluded due to problems with genotyping or blood flow measurements. ChBF was measured continuously using laser Doppler flowmetry while the subjects performed isometric exercise (squatting) for 6 minutes. The increase in ChBF was less pronounced than the response in ocular perfusion pressure (OPP), indicating for some degree of choroidal blood flow regulation. Eighteen subjects were homozygous for C, 47 subjects were homozygous for T and 31 subjects were heterozygous (CT). The increase in OPP during isometric exercise was not different between groups. By contrast the increase in ChBF was more pronounced in subjects homozygous for the high risk C allele (p = 0.041). This was also evident from the pressure/flow relationship, where the increase in ChBF in homozygous C carriers started at lower OPPs as compared to the other groups. Our data indicate that the regulation of ChBF is abnormal in rs1061170 CC carriers. So far this polymorphism has been linked to age related macular degeneration (AMD) mainly via inflammatory pathways associated with the complement system dysfunction. Our results indicate that it could also be related to vascular factors that have been implicated in AMD pathogenesis.
authors.affiliation: Department of Clinical Pharmacology, Medical University of Vienna, Vienna, Austria.
authors.forename: Reinhard
authors.initials: R
authors.lastname: Told
authors.forename: Stefan
authors.initials: S
authors.lastname: Palkovits
authors.forename: Helmuth
authors.initials: H
authors.lastname: Haslacher
authors.forename: Sophie
authors.initials: S
authors.lastname: Frantal
authors.forename: Doreen
authors.initials: D
authors.lastname: Schmidl
authors.forename: Agnes
authors.initials: A
authors.lastname: Boltz
authors.forename: Michael
authors.initials: M
authors.lastname: Lasta
authors.forename: Semira
authors.initials: S
authors.lastname: Kaya
authors.forename: René M
authors.initials: RM
authors.lastname: Werkmeister
authors.forename: Gerhard
authors.initials: G
authors.lastname: Garhöfer
authors.forename: Leopold
authors.initials: L
authors.lastname: Schmetterer
mesh_terms: D000293:Adolescent; D000328:Adult; D001794:Blood Pressure; D002829:Choroid / Q000098:blood supply*; D017242:Complement Factor H / Q000235:genetics*; D005260:Female; D006339:Heart Rate; D006439:Hemodynamics; D006579:Heterozygote; D006720:Homozygote; D006801:Humans; D007429:Intraocular Pressure; D008268:Macular Degeneration / Q000235:genetics; D008297:Male; D011110:Polymorphism, Genetic; D012039:Regional Blood Flow; D055815:Young Adult
chemical_list: D017242:Complement Factor H