title: Neopterin concentrations in blood donors differ between AB0 blood group phenotypes.
abstract: OBJECTIVE
  Neopterin is produced by human monocyte-derived macrophages upon stimulation with interferon-gamma and is therefore a sensitive indicator for cellular immune activation. Common factors like age, diastolic blood pressure, body mass index, or smoking habits were found to be associated with neopterin concentrations in humans.
  
  
  METHODS
  In order to find possible genetic determinants which might influence neopterin production, we investigated 8288 consecutive blood donors after exclusion of samples suspicious of infections.
  
  
  RESULTS
  Donors with blood group phenotype 0 had moderately, but significantly (P < 0.0001) higher neopterin concentrations (mean +/- SD: 6.94 +/- 1.52 nmol/L) than those with phenotype A (6.75 +/- 1.50 nmol/L), phenotype B (6.73 +/- 1.48 nmol/L), and phenotype AB (6.68 +/- 1.57 nmol/L).
  
  
  CONCLUSIONS
  Neopterin levels are higher in donors with blood group phenotype 0 than in other phenotypes. Data point to a genetic background of different neopterin concentrations. However, alterations of neopterin levels were much less expressed than the changes known to occur during diseases with an activated immune response.
authors.affiliation: Division of Biological Chemistry, Biocentre, Innsbruck Medical University, Fritz Pregl Strasse 3, A-6020 Innsbruck, Austria.
authors.forename: Christian
authors.initials: C
authors.lastname: Murr
authors.forename: Katharina
authors.initials: K
authors.lastname: Schroecksnadel
authors.forename: Diether
authors.initials: D
authors.lastname: Schönitzer
authors.forename: Dietmar
authors.initials: D
authors.lastname: Fuchs
authors.forename: Harald
authors.initials: H
authors.lastname: Schennach
mesh_terms: D000017:ABO Blood-Group System / Q000097:blood*; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D001782:Blood Donors; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D019798:Neopterin / Q000097:blood*; D010641:Phenotype; D012737:Sex Factors
chemical_list: D000017:ABO Blood-Group System; D019798:Neopterin