title: Variable plasma levels of Factor V Leiden correlate with circulating platelet microparticles in carriers of Factor V Leiden.
abstract: BACKGROUND
  Inheritance of Factor V Leiden (FVL) is associated with an increased but variable level of risk for thrombosis. We have previously shown that FVL heterozygotes have elevated levels of circulating pro-coagulant microparticles (MP). Here we sought to determine if these subjects differed in their plasma levels of FVL and if this was related to MP concentrations and/or history of thrombosis.
  
  
  METHODS
  The Hemoclot Quanti. V-L clotting assay was used to specifically measure FVL in plasma samples from 44 known carriers (12M, 32F; aged 46±13years). Circulating MP were quantified by flow cytometry using fluorochrome conjugated antibodies to platelet (CD41a), leukocyte (CD45), and endothelial (CD62e) surface markers, and MP prothrombinase activity was determined by ELISA.
  
  
  RESULTS
  The cohort was found to have a mean FVL of 49.5±5.6% and this was positively correlated to the total number of circulating CD41a+MP (R=0.31, p=0.03) but not to other MP subsets or to MP prothrombinase activity. The amount of FVL relative to normal factor V (FVL/FV clotting ratio) was calculated and found to be highly variable, ranging from 0.37 to 0.69, and significantly correlated with a history of thrombosis (n=14; p=0.04).
  
  
  CONCLUSIONS
  This is the first study to investigate the relationship between varying levels of FVL and plasma derived MP. These results are consistent with our previous findings of an increase in MP levels in carriers of FVL as compared to controls, and suggest a role for FVL/FV ratio in predicting risk of thrombosis in carriers of FVL.
authors.affiliation: Hunter Haematology Research Group, Calvary Mater Newcastle Hospital, NSW, Australia. lisa.lincz@newcastle.edu.au
authors.forename: Lisa F
authors.initials: LF
authors.lastname: Lincz
authors.forename: Fiona E
authors.initials: FE
authors.lastname: Scorgie
authors.forename: Anoop
authors.initials: A
authors.lastname: Enjeti
authors.forename: Michael
authors.initials: M
authors.lastname: Seldon
mesh_terms: D001792:Blood Platelets / Q000473:pathology*; D002452:Cell Count; D055252:Cell-Derived Microparticles / Q000235:genetics / Q000473:pathology*; D005165:Factor V / Q000032:analysis* / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics; D006579:Heterozygote; D006801:Humans; D008297:Male; D008875:Middle Aged; D012680:Sensitivity and Specificity; D013223:Statistics as Topic; D013927:Thrombosis / Q000097:blood / Q000235:genetics* / Q000473:pathology*
chemical_list: C095381:factor V Leiden; D005165:Factor V