title: Leucoreduction helps to preserve activity of antioxidant barrier enzymes in stored red blood cell concentrates.
abstract: BACKGROUND
  Oxidoreductive imbalance is a major cause of excessive haemolysis in in vitro conditions. Leucocytes and blood platelets present in red blood cell concentrates (RBCs) are one of the sources of free radicals, which have a significant effect on the status of stored erythrocytes. The study objective was to assess the effect of leucoreduction on the intensity of lipid peroxidation and the activity of antioxidant barrier enzymes in RBC.
  
  
  METHODS
  Red blood cell concentrates units obtained from 10 whole-blood units were split into two equal units, one of which was leucoreduced on the day of donation. Both units were stored for 35 days. The following markers of oxidoreductive balance were measured on day 0 (donation day) and on storage days 7, 14, 21 and 35: concentration of malondialdehyde (MDA) and activities of antioxidant barrier components, that is superoxide dismutase, glutathione peroxidase and glutathione reductase.
  
  
  RESULTS
  Lipid peroxidation in leucodepleted units (LRBC) was slower than that in non-leucodepleted ones. The analysis of LRBC revealed statistically significant decrease in concentrations of MDA. The activities of superoxide dismutase, glutathione peroxidase and glutathione reductase were higher throughout the storage period as compared to non-leucoreduced RBC. Statistically significant differences between RBC and LRBC units were noted throughout the storage in the activity of lactate dehydrogenase, and concentrations of K(+) ions and free haemoglobin.
  
  
  CONCLUSIONS
  Leucoreduction of RBC before storage helps to preserve the activity of antioxidant barrier enzymes in stored RBCs and significantly improves the quality of stored red blood cell components.
authors.affiliation: Department of Hematology, Medical University of Bialystok, Bialystok, Poland.
authors.forename: M
authors.initials: M
authors.lastname: Nędzi
authors.affiliation: Regional Centre for Transfusion Medicine in Bialystok, Bialystok, Poland.
authors.forename: A M
authors.initials: AM
authors.lastname: Chabowska
authors.affiliation: Regional Centre for Transfusion Medicine in Bialystok, Bialystok, Poland.
authors.forename: A
authors.initials: A
authors.lastname: Rogowska
authors.affiliation: Regional Centre for Transfusion Medicine in Bialystok, Bialystok, Poland.
authors.forename: B
authors.initials: B
authors.lastname: Boczkowska-Radziwon
authors.affiliation: Department of Pediatric Neurology, Medical University of Bialystok, Bialystok, Poland.
authors.forename: A
authors.initials: A
authors.lastname: Nędzi
authors.affiliation: Department of Hematology, Medical University of Bialystok, Bialystok, Poland.|Regional Centre for Transfusion Medicine in Bialystok, Bialystok, Poland.
authors.forename: P
authors.initials: P
authors.lastname: Radziwon
mesh_terms: D001793:Blood Preservation / Q000009:adverse effects / Q000379:methods*; D004912:Erythrocytes / Q000201:enzymology*; D005979:Glutathione Peroxidase / Q000097:blood*; D006461:Hemolysis; D006801:Humans; D015227:Lipid Peroxidation; D013482:Superoxide Dismutase / Q000097:blood*
chemical_list: D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase
keywords: antioxidant barrier; leucoreduction; lipid peroxidation; red blood cell concentrates