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The Prevention and Reversal of a Phenytoin-Resistant Model by N-acetylcysteine Therapy Involves the Nrf2/P-Glycoprotein Pathway at the Blood–Brain Barrier

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Abstract

The transporter hypothesis is one of the most popular hypotheses of drug-resistant epilepsy (DRE). P-glycoprotein (P-gp), a channel protein at the blood–brain barrier (BBB), plays an important role in the transport of some anti-seizure drugs from brain tissue into vessels, which reduces drug concentrations and diminishes the effects of drug treatment. We performed this study to test whether P-gp is overexpressed in DRE and identify ways to prevent and reverse DRE. In this study, we established a phenytoin (PHT)-resistant mouse model and revealed that P-gp was overexpressed at the BBB in PHT-resistant mice. The P-gp inhibitor nimodipine decreased the resistance of phenytoin. Antioxidative preventive treatment with N-acetylcysteine (NAC) prevented the mice from entering a PHT-resistant state, and NAC therapy tended to reverse PHT resistance into sensitivity. We were also able to induce PHT resistance by activating the Nrf2/P-gp pathway, which indicates that oxidative stress plays an important role in drug resistance. Taken together, these findings suggest that antioxidative therapy may be a promising strategy for overcoming DRE.

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Data Availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors are grateful to The Second Affiliated Hospital of Chongqing Medical University and Chongqing Key Laboratory of Neurology for providing facilities for this work.

Funding

This research was supported by the National Natural Science Foundation of China (82071458).

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Authors and Affiliations

Authors

Contributions

Qiankun Liu: Performing the experiments; methodology; writing, original draft; writing, review and editing. You Wang: Ideas; writing, original draft; writing, review and editing; supervision. Dandan Tan: Methodology, performing the experiments. Yong Liu: Ideas, methodology, writing—original draft. Peng Zhang: Data curation, methodology. Limin Ma: Analyze or synthesize study data, writing—review and editing. Minxue Liang: Analyze or synthesize study data, performing the experiments. Yangmei Chen: Ideas, resources, writing—review and editing, Funding acquisition, project administration. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Yangmei Chen.

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Ethics Approval

All animal experiments complied with the National Institutes of Health Guide for the Care and Use of Laboratory Animals and the rules of the Animal Ethical Committee of Chongqing Medical University.

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The authors declare no competing interests.

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Liu, Q., Wang, Y., Tan, D. et al. The Prevention and Reversal of a Phenytoin-Resistant Model by N-acetylcysteine Therapy Involves the Nrf2/P-Glycoprotein Pathway at the Blood–Brain Barrier. J Mol Neurosci 72, 2125–2135 (2022). https://doi.org/10.1007/s12031-022-02056-0

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  • DOI: https://doi.org/10.1007/s12031-022-02056-0

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