Protective response of gallic acid from oxidative nuclear and mitochondrial DNA damage in HeLa cells

Viscum albumL. is a semiparasitic plant grown on trees and widely used for the treatment of many diseases in traditional and complementary therapy. It is well known that some activities ofViscum albumextracts are varied depending on the host trees, such as antioxidant, apoptosis-inducing, anticancer activities of the plant. The aim of the present study is to examine the comparative effects of methanolic extracts ofV. albumgrown on three different host trees (locust tree, lime tree, and hedge maple tree) on H2O2-induced DNA damage in HeLa cells. Oxidative damage in mitochondrial DNA and two nuclear regions was assessed by QPCR assay. The cells were pretreated with methanolic extracts (10 μg/mL) for 48 h, followed by the treatment with 750 μM H2O2for 1 hour. DNA damage was significantly induced by H2O2while it was inhibited byV. albumextracts. All extracts completely protected against nuclear DNA damage. While the extract from lime tree or white locust tree entirely inhibited mitochondrial DNA damage, that from hedge maple tree inhibited by only 50%. These results suggest that methanolic extracts ofV. albumcan prevent oxidative DNA damage, and the activity is dependent on the host tree.

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Cytotoxic and antigenotoxic properties of phenolic compound isolated from the fruit of Terminalia chebula on HeLa cell

Beni-Suef University Journal of Basic and Applied Sciences ◽

10.1186/s43088-019-0017-9 ◽

2019 ◽

Vol 8 (1) ◽

Author(s):

K. Soumya ◽

Jesna James ◽

T. M. Archana ◽

A. T. Dhanya ◽

A. P. Shahid ◽

...

Keyword(s):

Dna Damage ◽

Gallic Acid ◽

Phenolic Compound ◽

Diethyl Ether ◽

Hela Cells ◽

Protective Role ◽

Terminalia Chebula ◽

Diethyl Ether Extract ◽

Toxic Concentration ◽

Isolated Compound

Abstract Background DNA in a human cell is subjected to constant assault from both environmental factors and normal metabolic processes. Accumulation of DNA damage drives the progression of many health disorders like aging, cancer, diabetes, and neurodegenerative disorders. Results The present study focuses on the isolation of phenolic compound from the fruit of Terminalia chebula and its protective role on induced DNA damage. Diethyl ether and ethyl acetate extract of Terminalia chebula fruit were subjected to column chromatographic purification, and the fractions obtained were tested for the presence of phenolics. Fraction-12 isolated from diethyl ether extract was identified as gallic acid, which is used for cytotoxic and DNA damage protection activity assays. To select a non-toxic concentration of isolated compound, cytotoxicity was assessed by MTT assay. Gallic acid showed moderate toxicity at the highest concentration tested (i.e., percentage cell viability at 100 μg/ml is 40.51 ± 1.31). Antigenotoxic effect of gallic acid on HeLa cells was carried by alkaline comet assay. The compound showed significant protective abilities against hydrogen peroxide-induced DNA damage in HeLa cells. Conclusion These results show the importance of gallic acid isolated from Terminalia chebula fruit, as protector of oxidative stress-induced DNA damage.

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