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Clinical Cancer Drugs

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ISSN (Print): 2212-697X
ISSN (Online): 2212-6988

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Research Article

Differential Proliferative and Cytotoxic Effect of Selected Components of Essential Oils on Human Glioblastoma Cells

Author(s): Sumbla Sheikh*, Alexander Sturzu, Hubert Kalbacher , Thomas Nägele , Ulrike Ernemann and Stefan Heckl

Volume 9, Issue 1, 2022

Published on: 26 January, 2022

Article ID: e101221198737 Pages: 10

DOI: 10.2174/2212697X08666211210104609

Price: $65

Abstract

Background: In the study of bioactive agents from traditional medicine, mono- and sesquiterpenes represent the main ingredients of essential oils. Till now, only thymoquinone and perillyl alcohol have been clinically tested on glioblastoma.

Objective: In the present study, we examined the effect of ten different essential oils on three human glioblastoma cell lines and one healthy human cell line.

Methods: We used confocal laser scanning microscopy, flow cytometry, and cell growth analysis to evaluate cell morphology changes, membrane disruption effects, acute cytotoxicity and effects on the proliferation rate caused by the essential oils pinene, geraniol, eucalyptol, perillaldehyde, limonene, and linalool, perillyl alcohol, myrcene, bisabolol and valencene on human cells. Caspase 3/7 activity was measured to observe apoptosis induced by the essential oils.

Results: We found that the cytotoxicity concentrations varied not only between different essential oils but also among different cell lines. Acute cytotoxicity of essential oils was based on cell membrane disruption and that HEK cells were affected to a much higher degree than the Glioblastoma cells. Vacuoles found in surviving glioblastoma cells appeared to be a factor in this effect.

Conclusion: Caspase activity did not correlate with the membrane damage observed in the flow cytometry experiments. This is especially evident in the HEK cells that only showed apoptosis with two out of ten essential oils. Comparison of the effects of other essential oil to perillyl alcohol, which is already used in glioblastoma therapy, revealed perillaldehyde and valencene as two new candidate substances that showed even stronger anti-glioblastoma effects in all experiments.

Keywords: Essential oils, glioblastoma, cytotoxicity, proliferation, terpenes, natural products.

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