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Role of Metallothionein-1 and Metallothionein-2 in the Neuroprotective Mechanism of Sevoflurane Preconditioning in Mice

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Abstract

This study investigated the protective effects and mechanisms of sevoflurane preconditioning (SPC) on neurons in ischemic mice. After SPC, mice were subjected to middle cerebral artery occlusion (MCAO). Cerebral infarction area, cell apoptosis, and metallothionein-1 (MT-1) and metallothionein-2 (MT-2) expressions in MCAO mice were analyzed. Mouse primary neurons were isolated and cultured to determine the location of metallothioneins (MTs) using immunofluorescence. Neurons transfected with MT-siRNA, exogenous MTs, or sh-MTF-1 were subjected to SPC and/or oxygen-glucose deprivation (OGD), and MT-1/MT-2 expression and neurotoxin release were assayed. Meanwhile, neurons were treated with the nitric oxide donor SNAP, degraded SNAP, or the peroxide initiator paraquat, and alterations in MT-1/MT-2 expression and neurotoxicity release were observed. SPC attenuated neuronal injury and apoptosis in MCAO mice. SPC could protect neurons against OGD injury and resulted in upregulated MT-1/MT-2 expression. MT-siRNA transfection led to the downregulated expression of MT-1/MT-2 and increased neurotoxicity, and the expression patterns of these neurons were different from those of neurons transfected with exogenous MTs. The knockdown of MTs could hinder the protective effect of SPC against OGD. Pretreatment with SNAP or paraquat could increase MTF-1 expression in the nucleus of neurons, protecting against OGD injury. The inhibition of nitric oxide and peroxide inhibited the protective role of SPC in OGD by downregulating MTF-1 expression. sh-MTF-1 transfection downregulated MT-1/MT-2 expression and enhanced neurotoxicity in neurons. SPC confers neuroprotection in focal cerebral ischemia mouse models by upregulating the expression of MT-1 and MT-2 by activating NO and peroxide and increasing MTF-1 expression in the nucleus.

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Acknowledgments

We would like to thank the participants for all the support and contributions.

Funding

This work was supported by the Clinical Research Center for Anesthesiology of ERAS in Hunan Province (2018SK7001).

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Authors

Contributions

LJT conceived the ideas. TSH and WTS designed the experiments. LJT, LJ, and LY performed the experiments. TSH analyzed the data. MXP and LJT provided critical materials. LJT and TSH wrote the manuscript. TYX supervised the study. All the authors have read and approved the final version for publication.

Corresponding author

Correspondence to Yixun Tang.

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All experimental procedures were approved by the Ethical Committee at Hunan Provincial People’s Hospital. Animals were treated in accordance with the Guide for the Care and Use of Laboratory Animals.

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The authors declare that there are no conflicts of interest.

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Liu, J., Tan, S., Wang, Y. et al. Role of Metallothionein-1 and Metallothionein-2 in the Neuroprotective Mechanism of Sevoflurane Preconditioning in Mice. J Mol Neurosci 70, 713–723 (2020). https://doi.org/10.1007/s12031-020-01481-3

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