title: [Lipid peroxidation and hemolysis in HES cryopreserved erythrocytes].
abstract: Using malondialdehyde (MDH) as an indicator of lipid peroxidation it was examined, whether oxygen radicals could be an origin of freeze-induced weakness of HES-cryopreserved erythrocytes. Each of 11 erythrocyte suspensions (Hct = 40; HES 200,000/0.62/12.5%; 60 mmol NaCl) was separated into 40 ml samples, cooled down to -196 degrees C und stored at -80 degrees C, finally. Samples were thawed after 1, 2, 3 und 6 months storage and besides that, one sample having remained at -196 degrees C (LN2). The MDH content (1.5 mumol/l Ery unwashed; 0.4 mumol/l Ery washed) amounted to 3.4 mumol/l Ery after LN2 storage, to 4 mumol/l Ery after 1 und to 8 mumol/l Ery after 6 months at -80 degrees C. Similarly, the MDH generation rate at -80 degrees C increased with storage time. The membrane fragility (1 in freshly drawn erythrocytes; 1.3 in erythrocytes out of LN2) rose from 1.6 after 1 month to 2.4 after 6 months. MDH content and membrane fragility were correlated linearly (r = 0.98). It is concluded that increased superoxide formation is mediated by freezed-induced oxidation of Hb-bound Fe. This allows peroxidation of membrane lipids which in consequence causes hemolysis.
authors.affiliation: Chirurgische Universitätsklinik, Abteilung Experimentelle Chirurgie, Würzburg, Deutschland.
authors.forename: R
authors.initials: R
authors.lastname: Langer
authors.forename: T
authors.initials: T
authors.lastname: Herold
authors.forename: H A
authors.initials: HA
authors.lastname: Henrich
mesh_terms: D001793:Blood Preservation; D015925:Cryopreservation; D006461:Hemolysis / Q000187:drug effects*; D006801:Humans; D006895:Hydroxyethyl Starch Derivatives / Q000494:pharmacology*; D015227:Lipid Peroxidation / Q000187:drug effects*; D008315:Malondialdehyde / Q000097:blood; D008563:Membrane Lipids / Q000378:metabolism; D009996:Osmotic Fragility / Q000187:drug effects
chemical_list: D006895:Hydroxyethyl Starch Derivatives; D008563:Membrane Lipids; D008315:Malondialdehyde
vernacular_title: Lipidperoxidation und Hämolyse bei HES-kryokonservierten Erythrozyten.