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- W1996630711 abstract "Reactive oxygen species produced by neutrophils contribute to the pathogenesis of focal cerebral ischemia/reperfusion injury and signal the inflammatory response. We have previously shown that honokiol, an active principle extracted from Magnolia officinalis, has a protective effect against focal cerebral ischemia/reperfusion injury in rats that paralleled a reduction in reactive oxygen species production by neutrophils. To elucidate the underlying mechanism(s) of the antioxidative effect of honokiol, peripheral neutrophils isolated from rats were activated with phorbol-12-myristate-13-acetate (PMA) or N-formyl-methionyl-leucyl-phenylalanine (fMLP) in the presence or absence of honokiol. In this study, we found that honokiol inhibited PMA- or fMLP-induced reactive oxygen species production by neutrophils by three distinct mechanisms: (1) honokiol diminished the activity of assembled-NADPH oxidase, a major reactive oxygen species producing enzyme in neutrophils by 40% without interfering with its protein kinase C (PKC)-dependent assembly; (2) two other important enzymes for reactive oxygen species generation in neutrophils, i.e., myeloperoxidase and cyclooxygenase, were also inhibited by honokiol by 20% and 70%, respectively; and (3) honokiol enhanced glutathione (GSH) peroxidase activity by 30%, an enzyme that triggers the metabolism of hydrogen peroxide (H2O2). These data suggested that honokiol, acting as a potent reactive oxygen species inhibitor/scavenger, could achieve its focal cerebral ischemia/reperfusion injury protective effect by modulating enzyme systems related to reactive oxygen species production or metabolism, including NADPH oxidase, myeloperoxidase, cyclooxygenase, and GSH peroxidase in neutrophils." @default.
- W1996630711 created "2016-06-24" @default.
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- W1996630711 date "2003-08-01" @default.
- W1996630711 modified "2023-10-09" @default.
- W1996630711 title "The anti-inflammatory effect of honokiol on neutrophils: mechanisms in the inhibition of reactive oxygen species production" @default.
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- W1996630711 doi "https://doi.org/10.1016/s0014-2999(03)02121-6" @default.
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