Abstract
The present study was aimed to evaluate the anticonvulsant activity of acteoside and explore its mechanism of action. Initially, the acteoside was evaluated in maximal electroshock (MES) and pentylenetetrazole (PTZ)–induced convulsions, and later it was evaluated against N-methyl-d-aspartic acid (NMDA)–induced mortality in Swiss albino mice. Based on the response in these models, further evaluations were performed to explore the mechanism of action. In the results, the acteoside (10, 25, and 50 mg/kg) has shown significant anticonvulsant activity in the PTZ model (p < 0.01 for all doses); however, there was no protection observed in MES and NMDA models. Therefore, further mechanism-based studies were performed on the PTZ model, and the outcomes have revealed that there was a significant reduction in GABA (p < 0.01 for both regions) and elevation of glutamate (p < 0.01 for both regions) in the cortex and hippocampus regions of PTZ-treated animals. Further, the antioxidant levels (SOD, catalase, GPx, GR, GSH, LPO) were altered significantly (p < 0.01 for all parameters), with reduced GABAA mRNA levels (p < 0.01) in the PTZ control compared with the normal control. Interestingly, co-administration of acteoside (25 mg/kg) (p < 0.01 for all parameters) has restored all the PTZ-induced alterations compared to PTZ-control. Moreover, the anti-PTZ action of acteoside was completely blocked in the presence of flumazenil, and thus confirmed the GABAergic mechanism behind the anticonvulsant activity of acteoside. Besides, actophotometer and rotarod tests have confirmed that the acteoside is free from central side effects like motor incoordination and locomotor deficits.
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Abbreviations
- ANOVA:
-
Analysis of variance
- CMC:
-
Carboxymethyl cellulose
- CPCSEA:
-
Committee for the Purpose of Control and Supervision of Experiments on Animals
- DMSO:
-
Dimethyl sulfoxide
- DNA:
-
Deoxyribonucleic acid
- ED:
-
Effective dose
- EDTA:
-
Ethylenediaminetetraacetic acid
- FT-IR:
-
Fourier transform-infrared spectroscopy
- GABA:
-
Gamma-aminobutyric acid
- GAPDH:
-
Glyceraldehyde-3-phosphate dehydrogenase
- GPx:
-
Glutathione peroxidase
- GR:
-
Glutathione reductase
- GSH:
-
Reduced glutathione
- HLTE:
-
Hind limb tonic extensor
- HLTF:
-
Hind limb tonic flexion
- HPLC:
-
High-performance liquid chromatography
- LC-MS/MS:
-
Liquid chromatography–mass spectroscopy
- LD:
-
Lethal dose
- LPO:
-
Lipid peroxidation
- mA:
-
Milliamps
- MCO:
-
Methanolic root extracts of C. oppositifolia
- MDA:
-
Malondialdehyde
- MES:
-
Maximal electroshock
- MPA:
-
3-Mercaptopropionic acid
- NMDA:
-
N-methyl-d-aspartic acid
- OPA:
-
o-Phthalaldehyde
- PTZ:
-
Pentylenetetrazole
- RNA:
-
Ribonucleic acid
- SEM:
-
Standard error of mean
- SOD:
-
Superoxide dismutase
- UV:
-
Ultraviolet spectroscopy
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The authors greatly acknowledge M/s Vittarthaa Life Sciences, Bommasandra Industrial Area, Bangalore for providing required facilities to carry out the research work.
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GLV, HS, DVK, MVV, and NBLP have contributed equally in the designing and conducting the study, data collection, analysis, and preparation of the manuscript. MVV and NBLP were involved in the critical analysis and interpretation of findings. HS and NBLP have proofread and approved the final version of the manuscript.
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Viswanatha, G.L., Shylaja, H., Kishore, D.V. et al. Acteoside Isolated from Colebrookea oppositifolia Smith Attenuates Epilepsy in Mice Via Modulation of Gamma-Aminobutyric Acid Pathways. Neurotox Res 38, 1010–1023 (2020). https://doi.org/10.1007/s12640-020-00267-0
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DOI: https://doi.org/10.1007/s12640-020-00267-0