Effect of the Isocoumarin Paepalantine on the Luminol and Lucigenin Amplified Chemiluminescence of Rat Neutrophils

作者: Rodrigo Rezende Kitagawa , Maria Stella Gonçalves Raddi , Najeh Maissar Khalil , Wagner Vilegas , Luiz Marcos da FONSECA

DOI: 10.1248/BPB.26.905

关键词:

摘要: Paepalantine (9,10-dihydroxy-5,7-dimethoxy-1H-naphto(2,3c)pyran-1-one), a natural isocoumarin isolated from the capitula of Paepalanthus bromelioides (Eriocaulaceae), was assessed for its effect on respiratory burst (zymosan-stimulated luminol-enhanced chemiluminescence and PMA-stimulated lucigenin-enhanced chemiluminescence) polymorphonuclear neutrophils in vitro. Special attention devoted to establishing IC50 neutrophils. able decrease luminol lucigenin chemiluminescence, reflecting an inhibitory burst, with ED50 0.44±0.05 0.84±0.15 μg/ml, respectively. A cell-free system performed paepalantine myeloperoxidase/H2O2 myeloperoxidase/H2O2/Cl− systems. inhibited oxidation both This inhibition related interaction paepalantine-myeloperoxidase scavenger HOCl.

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