Abstract
The role of the monoterpenes, especially limonene and perillyl alcohol, in the treatment of certain cancers is currently being evaluated in clinical trials. In this study, the effects of perillyl alcohol (POH) and its analog, perillaldehyde (PALD), on human carcinoma cell lines (BroTo and A549) cultured in vitro were investigated using proliferation assays (MTT and colony formation) and DNA content analysis by flow cytometry. POH and PALD elicited dose- and time-dependent inhibition of proliferation in both cell lines. Concentrations of POH and PALD that inhibited cell proliferation by 50% (IC 50) in 24 hr were 1 and 3 mM, respectively. DNA content analysis revealed that 1 mM of either POH or PALD caused cell cycle arrest in the G 1 phase in both cell lines while POH alone caused increased hypodiploid and annexin V-positive populations in both BroTo and A549 cells. POH induced apoptosis and was more effective than PALD at inhibiting the proliferation of BroTo and A549 cells cultured in vitro.
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