title: Increased platelet-monocyte aggregation in male claudicants with the Pl(A1/A2) polymorphism of Gp IIb/IIIa.
abstract: OBJECTIVE
  To investigate the relationship between the Pl(A1/A2) polymorphism and platelet activation and aggregation in patients with Peripheral Arterial Disease (PAD).
  
  
  METHODS
  A prospective single-centre cohort study.
  
  
  METHODS
  45 patients with PAD on aspirin 75mg were recruited and phenotyped/genotyped for the Gp IIb/IIIa Pl(A1/A2) polymorphism. Platelet-Monocyte Aggregation (PMAs) was evaluated using flow-cytometry.
  
  
  RESULTS
  The formation of PMAs in the Pl(A2) group was higher but not statistically significant (p=0.17). However, when males were analysed separately, the formation of PMAs was significantly higher in the Pl(A2) group (p=0.0192). No difference was seen in the females.
  
  
  CONCLUSIONS
  In this study we show that the Pl(A1/A2) polymorphism primarily affects the aggregation of platelets to monocytes in males. The effect is not observed in females and understanding the mechanism behind this may help elucidate the way the polymorphism alters platelet function in the presence of aspirin.
authors.affiliation: Queen Elizabeth Hospital, Gateshead, UK.
authors.forename: J
authors.initials: J
authors.lastname: McCaslin
authors.affiliation: Queen Elizabeth Hospital, Gateshead, UK.
authors.forename: H
authors.initials: H
authors.lastname: Ashour
authors.affiliation: Queen Elizabeth Hospital, Gateshead, UK.
authors.forename: V
authors.initials: V
authors.lastname: Bhattacharya
authors.affiliation: Northern Vascular Unit, Freeman Hospital, Newcastle-upon-Tyne, UK.
authors.forename: M
authors.initials: M
authors.lastname: Cleanthis
authors.affiliation: Newcastle University, Newcastle, UK.
authors.forename: A
authors.initials: A
authors.lastname: Daly
authors.affiliation: Northern Vascular Unit, Freeman Hospital, Newcastle-upon-Tyne, UK. Electronic address: gerard.stansby@nuth.nhs.uk.
authors.forename: G
authors.initials: G
authors.lastname: Stansby
mesh_terms: D000368:Aged; D001241:Aspirin / Q000627:therapeutic use; D001792:Blood Platelets / Q000187:drug effects / Q000378:metabolism*; D005260:Female; D005434:Flow Cytometry; D005787:Gene Frequency; D005838:Genotype; D006801:Humans; D007383:Intermittent Claudication / Q000097:blood / Q000188:drug therapy / Q000235:genetics*; D008297:Male; D009000:Monocytes / Q000378:metabolism*; D016491:Peripheral Vascular Diseases / Q000097:blood / Q000150:complications / Q000188:drug therapy / Q000235:genetics*; D010641:Phenotype; D010973:Platelet Adhesiveness / Q000187:drug effects / Q000235:genetics*; D010975:Platelet Aggregation Inhibitors / Q000627:therapeutic use; D019039:Platelet Glycoprotein GPIIb-IIIa Complex / Q000235:genetics* / Q000378:metabolism; D012150:Polymorphism, Restriction Fragment Length; D011446:Prospective Studies; D012737:Sex Factors
chemical_list: D010975:Platelet Aggregation Inhibitors; D019039:Platelet Glycoprotein GPIIb-IIIa Complex; D001241:Aspirin