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DOI: 10.1055/s-2003-39695
© Georg Thieme Verlag Stuttgart · New York
Antitumor Activity of Balsam Fir Oil: Production of Reactive Oxygen Species Induced by α-Humulene as Possible Mechanism of Action
Publikationsverlauf
Received: September 24, 2002
Accepted: November 9, 2002
Publikationsdatum:
12. Juni 2003 (online)
Abstract
The antitumor activity of the essential oil of Abies balsamea (balsam fir oil) was evaluated against several solid tumor cell lines including MCF-7, PC-3, A-549, DLD-1, M4BEU and CT-26. Balsam fir oil was found to be active against all the solid tumor cell lines tested, with GI50 values ranging between 0.76 and 1.7 mg/mL. The oil was analyzed by GC-MS and the cytotoxicity of each oil constituent was determined. Balsam fir oil is essentially constituted of monoterpenes (&γτ; 96 %) and some sesquiterpenes. All the compounds tested were inactive (&γτ; 250 μM) except for α-humulene (GI50 = 55 to 73 μM) which thus seems responsible for the cytotoxicity of the oil. We also tested the cytotoxicity of caryophyllene oxide, which proved inactive, and γ-caryophyllene which was found to be active against all solid tumor cell lines tested. We evaluated the effects of balsam fir oil and α-humulene on the cellular glutathione (GSH) content and on the production of reactive oxygen species (ROS). Balsam fir oil and α-humulene induced a dose- and time-dependent decrease in cellular GSH content and an increase in ROS production. These results suggest that GSH depletion and ROS production may be implicated in the cytotoxicity of α-humulene and balsam fir oil.
Key words
Pinaceae - Abies balsamea - balsam fir - essential oil - antitumor activity - glutathione - reactive oxygen species - sesquiterpenoids - α-humulene
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