title: Genetic polymorphisms of platelet glycoprotein Ia and the risk for premature myocardial infarction: effects on the release of sCD40L during the acute phase of premature myocardial infarction.
abstract: OBJECTIVE
  The aim of this research was to evaluate the effect of genetic polymorphisms C807T and G1648A of platelet glycoprotein Ia (GPIa), on the risk for myocardial infarction (MI) and on the release of soluble CD40 ligand (sCD40L) during the acute phase of MI and one year after the event.
  
  
  BACKGROUND
  C807T and G1648A polymorphisms affect the density of GPIa on platelet surface, but their effect on the risk for MI and the release of sCD40L is unknown.
  
  
  METHODS
  The study population consisted of 219 patients with premature MI and 389 controls. One year after the event, 67 patients and 232 controls were recalled for the follow-up study.
  
  
  RESULTS
  The risk for MI in 807TT was 2.296 (95% confidence interval [CI]: 1.187 to 4.440) p < 0.05 versus CC + CT, 2.269 (95% CI: 1.085 to 4.745) p < 0.05 versus CC, and 2.135 (95% CI: 1.080 to 4.219) p < 0.05 versus CT. During the acute phase of MI, sCD40L was higher in 807CT + TT compared with 807CC (p < 0.01), an effect persisting after one year (p < 0.01). The carriage of 807T allele was an independent predictor for sCD40L during the acute phase of MI (beta = 9.442 [standard error (SE): 2.526], p = 0.001) and in the same patients one year later (beta = 8.282 [SE: 2.044], p = 0.001). In healthy individuals, 807T allele was associated with higher sCD40L levels compared with 807CC (p < 0.05), only among those with von Willebrand factor greater than or equal to median.
  
  
  CONCLUSIONS
  Genetic polymorphism C807T increases the risk for premature MI. 807T allele is an independent predictor for sCD40L levels during the acute phase of premature MI as well as one year after the event, while it is associated with elevated sCD40L levels in healthy subjects, only in the presence of high von Willebrand levels.
authors.affiliation: Athens University Medical School, 1st Cardiology Department, Hippokration Hospital, Athens, Greece.
authors.forename: Charalambos
authors.initials: C
authors.lastname: Antoniades
authors.forename: Dimitris
authors.initials: D
authors.lastname: Tousoulis
authors.forename: Carmen
authors.initials: C
authors.lastname: Vasiliadou
authors.forename: Elli
authors.initials: E
authors.lastname: Stefanadi
authors.forename: Kyriakoula
authors.initials: K
authors.lastname: Marinou
authors.forename: Christodoulos
authors.initials: C
authors.lastname: Stefanadis
mesh_terms: D023201:CD40 Ligand / Q000097:blood*; D005260:Female; D005500:Follow-Up Studies; D005838:Genotype; D006801:Humans; D039421:Integrin alpha2 / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000097:blood / Q000235:genetics*; D015539:Platelet Activation / Q000235:genetics*; D010973:Platelet Adhesiveness / Q000235:genetics; D011110:Polymorphism, Genetic; D012307:Risk Factors; D014841:von Willebrand Factor / Q000032:analysis
chemical_list: D039421:Integrin alpha2; D014841:von Willebrand Factor; D023201:CD40 Ligand