title: Simple chemiluminescence assays for free radicals in venous blood and serum samples: results in atopic, psoriasis, MCS and cancer patients.
abstract: OBJECTIVE
  To investigate the generation of reactive oxygen species (ROS) in serum and venous blood as well as the serum antioxidative activity (AOA) in patients and healthy controls by means of a simplified chemiluminescence (CL) methodology.
  
  
  METHODS
  48 Atopic eczema, 23 psoriasis, 15 multiple chemical sensitivity (MCS) and 35 cancer patients together with 22 healthy volunteers.
  
  
  METHODS
  ROS generation/photon emission in blood and serum samples under basal conditions and after light exposure as well as the AOA of the serum samples was investigated at room temperature (22 degrees C) in all 143 fasted subjects. The 3-step methodology resumes in adding a constant amount of blood or serum to a constant amount of CL substrate (or to an ROS-generating mixture for the AOA test), followed by a short preincubation and registration of the photon counts over a 600-second time interval.
  
  
  RESULTS
  In the basal and light exposure tests significantly higher photon counts (> 14, 000 counts/600 s) were registered in venous blood in all patient groups when compared to healthy controls (p < 0.001), suggesting increased amounts of activated leukocytes and light-sensitizing compounds, respectively. By contrast, most patient sera showed in all three CL tests a strongly inhibited light emission (p < 0.005), suggesting an adaptive antioxidative response to oxidant stress factors.
  
  
  CONCLUSIONS
  Atopic, psoriasis, MCS and cancer patients are exhibiting significantly changed blood and serum CL patterns when compared to healthy controls. The described assays are simple, well reproducible and enable a fast assessment of ROS generation and AOA in biological samples at low operational costs.
authors.affiliation: Forschungsabteilung der Spezialklinik Neukirchen, Germany. www.spezialklinik-neukirchen.de
authors.forename: G
authors.initials: G
authors.lastname: Ionescu
authors.forename: M
authors.initials: M
authors.lastname: Merk
authors.forename: R
authors.initials: R
authors.lastname: Bradford
mesh_terms: D002138:Calibration; D003876:Dermatitis, Atopic / Q000097:blood*; D004485:Eczema / Q000097:blood*; D005609:Free Radicals / Q000097:blood; D006801:Humans; D008163:Luminescent Measurements; D018777:Multiple Chemical Sensitivity / Q000097:blood*; D009369:Neoplasms / Q000097:blood*; D011565:Psoriasis / Q000097:blood*; D012016:Reference Values; D012680:Sensitivity and Specificity
chemical_list: D005609:Free Radicals