title: The effect of hemolysis on plasma oxidation and nitration in patients with sickle cell disease.
abstract: This study aimed to determine the effect of haemolysis on plasma oxidation and nitration in sickle cell disease (SCD) patients. Blood was collected from haemoglobin (Hb)A volunteers and homozygous HbSS patients who had not received blood transfusions in the last 3 months. Haemolysis was characterised by low levels of haemoglobin and haptoglobin and high levels of reticulocyte, mean corpuscular volume (MCV), mean corpuscular haemoglobin (MCH), plasma cell-free haemoglobin, bilirubin, total lactate dehydrogenase (LDH) and dominance of LDH-1 isoenzyme. Plasma 8-isoprostane, protein carbonyl and nitrotyrosine levels were measured to evaluate oxidised lipids, oxidised and nitrated proteins, respectively. Plasma nitrite-nitrate levels were also determined to assess nitric oxide (NO) production in both SCD patients and controls. Markers of haemolysis were significantly evident in SCD patients compared to controls. Plasma 8-isoprostane, protein carbonyl and nitrotyrosine levels were markedly elevated in SCD patients compared to controls. Linear regression analysis revealed a significant inverse correlation between haemoglobin and reticulocyte counts and a significant positive correlation of plasma cell-free haemoglobin with protein carbonyl and nitrotyrosine levels. The obtained data shows that increased haemolysis in SCD increases plasma protein oxidation and nitration.
authors.affiliation: Department of Pediatric Hematology, Akdeniz University Medical School, Antalya, Turkey.
authors.forename: Alphan
authors.initials: A
authors.lastname: Kupesiz
authors.forename: Gamze
authors.initials: G
authors.lastname: Celmeli
authors.forename: Serdar
authors.initials: S
authors.lastname: Dogan
authors.forename: Bulent
authors.initials: B
authors.lastname: Antmen
authors.forename: Mutay
authors.initials: M
authors.lastname: Aslan
mesh_terms: D000293:Adolescent; D000328:Adult; D000755:Anemia, Sickle Cell / Q000097:blood*; D001663:Bilirubin / Q000097:blood; D015415:Biomarkers / Q000097:blood; D002648:Child; D002675:Child, Preschool; D015237:Dinoprost / Q000031:analogs & derivatives / Q000097:blood; D004909:Erythrocyte Indices; D005260:Female; D006242:Haptoglobins / Q000032:analysis; D006441:Hemoglobin A / Q000032:analysis*; D006451:Hemoglobin, Sickle / Q000032:analysis*; D006461:Hemolysis; D006801:Humans; D007527:Isoenzymes / Q000097:blood; D007770:L-Lactate Dehydrogenase / Q000097:blood; D008297:Male; D009569:Nitric Oxide / Q000097:blood; D010084:Oxidation-Reduction; D017701:Reticulocyte Count; D012156:Reticulocytes / Q000473:pathology; D014443:Tyrosine / Q000031:analogs & derivatives / Q000097:blood
chemical_list: D015415:Biomarkers; D006242:Haptoglobins; D006451:Hemoglobin, Sickle; D007527:Isoenzymes; C075750:8-epi-prostaglandin F2alpha; D009569:Nitric Oxide; C002744:3-nitrotyrosine; D014443:Tyrosine; D006441:Hemoglobin A; D015237:Dinoprost; D007770:L-Lactate Dehydrogenase; C409667:lactate dehydrogenase 1; D001663:Bilirubin