title: Powerful protective role of 3,4-dihydroxyphenylethanol-elenolic acid dialdehyde against erythrocyte oxidative-induced hemolysis.
abstract: The present work studied and compared the capacity of four important olive oil polyphenolic compounds, oleuropein, hydroxytyrosol, and the oleuropein aglycones 3,4-dihydroxyphenylethanol-elenolic acid (3,4-DHPEA-EA) and 3,4-dihydroxyphenylethanol-elenolic acid dialdehyde (3,4-DHPEA-EDA), to protect red blood cells (RBCs) from oxidative hemolysis induced by the physiological initiator H2O2. The amount of hemolysis was evaluated spectrophotometrically. The compounds were also tested in the presence and absence of the naturally occurring antioxidant ascorbic acid. All compounds were revealed to significantly protect RBCs from oxidative hemolysis induced by H2O2 at 40 and 80 microM, with the order of activity being 3,4-DHPEA-EDA>3,4-DHPEA-EA>hydroxytyrosol=oleuropein. At 20, 10, and 5 microM, only 3,4-DHPEA-EDA showed a significant protection against the oxidative injury. In the presence of ascorbic acid at physiological concentration, the addition of individual compounds at 40 microM increased the stability of erythrocytes. The addition of phenolic compounds at 20 and 10 microM did not produce further protection when compared with the protection given by ascorbic acid alone, except for 3,4-DHPEA-EDA. This compound was shown to produce further protection even at 5 microM. In summary, 3,4-DHPEA-EDA plays an important protective role against reactive oxygen species-induced oxidative injury in RBCs, and this effect is more potent than the one evidenced by hydroxytyrosol or oleuropein.
authors: CIQ, Porto, Portugal. mpmartin@fc.up.pt
authors: Fátima
authors: F
authors: Paiva-Martins
authors: João
authors: J
authors: Fernandes
authors: Vera
authors: V
authors: Santos
authors: Lisete
authors: L
authors: Silva
authors: Fernanda
authors: F
authors: Borges
authors: Susana
authors: S
authors: Rocha
authors: Luis
authors: L
authors: Belo
authors: Alice
authors: A
authors: Santos-Silva
mesh_terms: D000328:Adult; D004912:Erythrocytes / Q000187:drug effects* / Q000378:metabolism*; D005260:Female; D006461:Hemolysis / Q000187:drug effects*; D006801:Humans; D006861:Hydrogen Peroxide / Q000494:pharmacology; D008297:Male; D000069463:Olive Oil; D018384:Oxidative Stress / Q000187:drug effects*; D010636:Phenols / Q000032:analysis / Q000494:pharmacology*; D010938:Plant Oils / Q000032:analysis*; D011714:Pyrans / Q000032:analysis / Q000494:pharmacology*; D055815:Young Adult
chemical_list: C547883:3,4-dihydroxyphenylethanol-elenolic acid dialdehyde; C121925:3,4-dixydroxyphenylethanol elenolic acid; D000069463:Olive Oil; D010636:Phenols; D010938:Plant Oils; D011714:Pyrans; D006861:Hydrogen Peroxide