Cedrus deodara (Bark) Essential Oil Induces Apoptosis in Human Colon Cancer Cells by Inhibiting Nuclear Factor kappa B

Author(s): Madhulika Bhagat*, Ajay Kumar, Renuka Suravajhala

Journal Name: Current Topics in Medicinal Chemistry

Volume 20 , Issue 22 , 2020


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Abstract:

Aims: The aim of this study is to explore essential oil from the bark of Cedrus deodara (CDEO) as an potential anticancer agent.

Background: The frontline drugs against cancer in clinical settings are posing challenges of resistance and other detrimental side-effects. This has led to the exploration of new anticancer chemical entities from natural sources, particularly plant-based products such as essential oils that serve as vast repositories of pharmacologically active substances for combating cancer.

Objective: The objective is to isolate and characterize the essential oil from the bark of Cedrus deodara (CDEO) and evaluate its potential as an anticancer agent and delineate the possible underlying mechanism of action.

Methods: Cedrus deodara essential oil from bark (CDEO) was obtained by hydro-distillation and analyzed by GC/MS for vital constituents. Further, in vitro cytotoxic potential was measured by MTT assay against a panel of cancer cell lines. The apoptosis-inducing potential of CDEO was analyzed by mitochondrial membrane potential loss (ΔΨm) and nuclear fragmentation assay. Besides, wound healing assay and colonogenic assay were employed to check the anti-metastatic potential of CDEO. Molecular docking approaches were employed for target identification, while immuno-blotting was carried out for target validation.

Results and Discussion: The major components identified were 2-(tert-Buyl)-6-methyl-3-(2- (trifluoromethyl) benzyl)imidazo [1,2-a]pyridine (26.32 %);9- Octadecenoic acid (8.015 %); Copaene (5.181 %);2-(4-Methoxy-2,6-dimethylphenyl) -3-methyl-2H- benzo[g]indazole(4.36 %) and 9(E),11(E)- Conjugated linoleic acid (4.299 %). Further, potent in vitro cytotoxic activity with IC50 values of 11.88 μg/ ml and 14.63 μg/ ml in colon cancer cell lines of HCT-116 and SW-620, respectively. Further, a significant and dose-dependent decrease in colony formation, cell migration, induction of ROS formation and loss in ΔΨm was observed. Additionally, major compounds identified were chosen for ligandprotein binding interaction studies to predict the molecular targets in colon cancer. It was observed that compounds such as 9-Octadecenoic acid;4H-1- Benzopyran-4-one, 3-(3,4-dimethoxyphenyl)-6,7- dimethoxy; 2-(4-Methoxy-2,6-dimethylphenyl) -3-methyl-2H-benzo [g]indazole and 2-Bornanol,5-(2,4- dinitro phenyl) hydrazono have a prominent binding affinity with NF-κB. This was also further validated by immuno-blotting results wherein CDEO treatment in colon cancer cells led to the abrogation of NFκB, and the Bcl-2-associated X protein (Bax): B-cell lymphoma (Bcl)-2 ratio was up-regulated leading to enhanced cleaved caspase 3 formation and subsequent apoptosis.

Conclusion: These results unveil CDEO inhibits cell proliferation and induces apoptosis in colon cancer cells, which can be attributed to the abrogation of the NFκB signaling pathway.

Keywords: Cedrus deodara, Essential oil, Colon cancer, Antiproliferative, Apoptosis, Cell migration.

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VOLUME: 20
ISSUE: 22
Year: 2020
Published on: 22 July, 2020
Page: [1981 - 1992]
Pages: 12
DOI: 10.2174/1568026620666200722120826
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