Journal Article
Research Support, Non-U.S. Gov't
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Suppression of neutrophil recruitment in mice by geranium essential oil.

BACKGROUND: In aromatherapy, essential oils are used as anti-inflammatory remedies, but experimental studies on their action mechanisms are very limited.

AIMS OF THE STUDY: To assess their anti-inflammatory activities, the effects of essential oils on neutrophil recruitment in mice were examined in vivo.

METHOD: The effect of essential oils on leukocyte and neutrophil recruitment induced 6 h after intraperitoneal injection of casein in mice was examined.

RESULTS: Leukocyte recruitment into the peritoneal cavity in mice was suppressed by intraperitoneal injections of geranium, lemongrass and spearmint oils at the dose of 5 microl/mouse, but was not by tea tree oil. This recruitment was inhibited dose-dependently by geranium oil. The suppression of leukocyte recruitment resulted from inhibition of neutrophil accumulation.

CONCLUSION: Some essential oils used as anti-inflammatory remedies suppress neutrophil recruitment into the peritoneal cavity in mice.

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