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Liu, G. et al.

Effect of three flavonoids isolated from Japanese Polygonum species on superoxide generation in human neutrophils.

Three flavonoids, quercetin 3- O-glucoside-2''-gallate (QGG), quercetin 3- O-rhamnoside-2''-gallate (QRG) and kaempferol 3- O-glucoside-2''-gallate (KGG) were isolated from Japanese Polygonum species. The effect of these flavonoids on stimulus-induced superoxide generation in human neutrophils was assayed by measuring the reduction of cytochrome c. The tyrosyl or serine/threonine phosphorylation of neutrophil proteins and the translocation of p4(phox) and p67(phox) to the cell membrane were detected using specific monoclonal antibodies. The flavonoids used in this experiment significantly suppressed stimulus-induced superoxide generation in a concentration-dependent manner. FMLP- induced tyrosyl phosphorylation or PMA-induced serine/threonine phosphorylation and the translocation of the cytosolic proteins p47(phox) and p67(phox) to the cell membrane were suppressed in parallel to the suppression of the stimulus-induced superoxide generation.[1]

References

Effect of three flavonoids isolated from Japanese Polygonum species on superoxide generation in human neutrophils. Liu, G., Wang, W., Masuoka, N., Isobe, T., Yamashita, K., Manabe, M., Kodama, H. Planta Med. (2005) [Pubmed]

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