Lemon verbena and Green tea significantly inhibited reactive oxygen species in a concentration-dependent manner, whereas Camellia japonica and Antiallerge ® did not. The migratory activity of neutrophils was not affected by those plant extracts. Also, damaged cells were not detected. Conclusion: It was suggested that Lemon verbena and Green tea scavenged reactive oxygen species without causing cell death of neutrophils. This new method for measuring neutrophil activities can be applied not only for assessing the status of inflammation and oxidative stress but also as the screening system for predicting the effectiveness of antioxidant and anti-inflammatory substances.
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