Abstract
The in vitro antioxidant properties, cytoprotective activity, and ability to induce nuclear translocation of nuclear factor E2-related factor-2 (Nrf-2) of five solvent fractions of the methylene chloride/methanol (1:1 v/v) extract of Khaya grandifoliola (Meliaceae) and Entada africana (Fabaceae) were evaluated. Five antioxidant endpoints were used in the antioxidant activity investigation. The total phenolic content of the fractions was assessed as to the Folin–Ciocalteu method and the profile of interesting fractions analyzed by high-performance liquid chromatography (HPLC). The cytoprotective activity of fractions was determined by H2O2-induced oxidative stress in HC-04 cells by measuring lactate dehydrogenase (LDH) leakage into culture medium. HC-04 cells were used to investigate the ability to induce nuclear translocation of Nrf2. For both plants, the methylene chloride/methanol (90/10; v/v) fraction (F10), methylene chloride/methanol (75/25; v/v) (F25), and the methanolic fraction (F100) were found to have the highest total polyphenol content and exhibited high antioxidant activity strongly correlated with total polyphenol content. The cytoprotective activity of fraction F25 from both plants was comparable to that of quercetin (3.40 ± 0.05 μg/mL), inhibiting LDH leakage with a low half inhibition concentration (IC50) of 4.05 ± 0.03 and 3.8 ± 0.02 μg/mL for K. grandifoliola and E. africana, respectively. Lastly, fraction F25 of K. grandifoliola significantly (P < 0.05) induced nuclear Nrf2 translocation by sixfold, whereas that from E. africana and quercetin was only twofold. The results indicate for the first time that fraction F25 of the studied plants is more antioxidant and cytoprotective and induces nuclear translocation of Nrf2 in a human hepatocyte cell line.
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Abbreviations
- CE:
-
Plant crude extracts
- F0:
-
Methylene chloride fraction
- F5:
-
Methylene chloride/methanol (95/5; v/v) fraction
- F10:
-
Methylene chloride/methanol (90/10; v/v) fraction
- F25:
-
Methylene chloride/methanol (75/25; v/v) fraction
- F100:
-
Methanolic fraction
- RC:
-
Reference compound
- PE:
-
Plant extracts
- AA:
-
Ascorbic acid
- DPPH 2:
-
2-Diphenyl-picryl-hydrazyl (DPPH) free-radical scavenging assay
- LP:
-
Inhibition of rat liver lipid peroxidation assay
- HR:
-
Hydroxyl radical scavenging assay
- LDH:
-
Lactate dehydrogenase
- HPLC-UV:
-
High-performance liquid chromatography-ultraviolet
- ROS:
-
Reactive oxygen species
- Nrf2:
-
Nuclear factor E2-related factor-2
- DMEM:
-
Dulbecco’s modified Eagle’s medium
- DMSO:
-
Dimethyl sulfoxide
- MTS:
-
3-(4, 5-Dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium salt
- CAE:
-
Chlorogenic acid equivalents
- AAE:
-
Ascorbic acid equivalent
- HEPES:
-
N-2-hydroxyethylpiperazine-N-2-ethanesulfonic acid
- EDTA:
-
Ethylenediaminetetraacetic acid
- DTT:
-
Dithiotreitol
- PVDF:
-
Polyvinylidene difluoride
- SDS-PAGE:
-
Sodium dodecyl sulfate polyacrylamide gel electropheresis
- ANOVA:
-
Analysis of variance
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Acknowledgments
Grants from the International Foundation for Sciences and the Organisation for the Prohibition of Chemical Weapons (F/4223-2) and National Institute of Health (DK069557) awarded to Drs. Njayou and Manautou, respectively, supported this work. Dr. Njayou thanks the Fulbright Program for the award which allowed him to carry out experiments on HC-04 cells in the laboratory of Dr. Manautou at the School of Pharmacy, Connecticut, USA.
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Njayou, F.N., Amougou, A.M., Fouemene Tsayem, R. et al. Antioxidant fractions of Khaya grandifoliola C.DC. and Entada africana Guill. et Perr. induce nuclear translocation of Nrf2 in HC-04 cells. Cell Stress and Chaperones 20, 991–1000 (2015). https://doi.org/10.1007/s12192-015-0628-6
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DOI: https://doi.org/10.1007/s12192-015-0628-6