title: Platelet adhesion onto immobilized fibrinogen under arterial and venous in-vitro flow conditions does not significantly differ between men and women.
abstract: BACKGROUND
  Gender-related differences in incidence of arterial thrombosis have been a focus of interest for years. The platelet integrin alphaIIbbeta3 is primarily responsible for the interaction between platelets and fibrinogen and consecutive thrombus growth. In this study, we evaluated platelet adhesion onto immobilized fibrinogen under venous and arterial flow conditions in men and women.
  
  
  METHODS
  Platelets in whole anticoagulated blood were labelled with the fluorescence dye Mepacrine and perfused through the rectangular flow chamber over glass cover slips coated with fibrinogen (shear rates of 50 s-1, 500 s-1 and 1500 s-1). A fluorescence laser-scan microscope was used for visualisation and quantification of platelet adhesion at 15 seconds, 1 and 5 minutes after the start of perfusion.
  
  
  RESULTS
  During perfusion, the platelet adhesion linearly increased in regard to exposition time and shear rate. After five minutes of perfusion the platelet adhesion onto immobilized fibrinogen showed no significant gender related difference, neither at 50 s-1 nor at 500 s-1 and 1500 s-1 (p > 0.05), respectively. No significant difference in platelet adhesion onto immobilized fibrinogen, in regard to the menopausal status, was either observed (p > 0.05).
  
  
  CONCLUSIONS
  In our in vitro experimental system, hormonal differences between men and women did not influence platelet adhesion onto immobilized fibrinogen, neither under venous nor under arterial rheological conditions.
authors.affiliation: Institut für Hämostaseologie und Transfusionsmedizin, Heinrich-Heine-Universität, Moorenstr, 5, D-40225 Düsseldorf, Germany. Loncar@med.uni-duesseldorf.de
authors.forename: Robert
authors.initials: R
authors.lastname: Loncar
authors.forename: Reiner B
authors.initials: RB
authors.lastname: Zotz
authors.forename: Christoph
authors.initials: C
authors.lastname: Sucker
authors.forename: Aleksandar
authors.initials: A
authors.lastname: Vodovnik
authors.forename: Mario
authors.initials: M
authors.lastname: Mihalj
authors.forename: Rüdiger E
authors.initials: RE
authors.lastname: Scharf