title: Diurnal variation in PAI-1 activity predominantly confined to the 4G-allele of the PAI-1 gene.
abstract: We examined the diurnal pattern in Plasminogen Activator Inhibitor-type 1 (PAI-1) activity and Plasminogen activator (t-PA) in relation to the 4G/5G-polymorphism in the promoter of the PAI-1 gene. The analyses were performed in the Arnhem Elderly Study, a population-based study of 598 elderly. A single blood sample was drawn and the time of blood sampling was recorded (between 8 a.m. and 5.30 p.m.). Plasma PAI-1 activity was strongly associated with time of blood sampling, showing the highest values in the early morning. The diurnal pattern was clearly present in the 4G/4G (n = 184) and 4G/5G (n = 275) genotypes, but not in the 5G/5G-genotype (n = 139). T-PA antigen showed a weak diurnal variation, which did not differ across the variants of the 4G/5G-polymorphism. Our findings raise the hypothesis that 5G-homozygotic persons may be relatively protected from diurnal variation in the occurrence of coronary events.
authors.affiliation: Division of Human Nutrition & Epidemiology, Wageningen University, The Netherlands.
authors.forename: Tiny
authors.initials: T
authors.lastname: Hoekstra
authors.forename: Johanna M
authors.initials: JM
authors.lastname: Geleijnse
authors.forename: Evert G
authors.initials: EG
authors.lastname: Schouten
authors.forename: Cornelis
authors.initials: C
authors.lastname: Kluft
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000483:Alleles; D002940:Circadian Rhythm; D015331:Cohort Studies; D005260:Female; D005787:Gene Frequency; D005838:Genotype; D006801:Humans; D008297:Male; D017395:Plasminogen Activator Inhibitor 1 / Q000096:biosynthesis* / Q000097:blood / Q000235:genetics*; D011110:Polymorphism, Genetic; D011401:Promoter Regions, Genetic; D010959:Tissue Plasminogen Activator / Q000096:biosynthesis / Q000097:blood
chemical_list: D017395:Plasminogen Activator Inhibitor 1; D010959:Tissue Plasminogen Activator