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Klotho Upregulation via PPARγ Contributes to the Induction of Brain Ischemic Tolerance by Cerebral Ischemic Preconditioning in Rats

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Abstract

Cerebral ischemic preconditioning (CIP)-induced brain ischemic tolerance protects neurons from subsequent lethal ischemic insult. However, the specific mechanisms underlying CIP remain unclear. In the present study, we explored the hypothesis that peroxisome proliferator-activated receptor gamma (PPARγ) participates in the upregulation of Klotho during the induction of brain ischemic tolerance by CIP. First we investigated the expression of Klotho during the brain ischemic tolerance induced by CIP. Lethal ischemia significantly decreased Klotho expression from 6 h to 7 days, while CIP significantly increased Klotho expression from 12 h to 7 days in the hippocampal CA1 region. Inhibition of Klotho expression by its shRNA blocked the neuroprotection induced by CIP. These results indicate that Klotho participates in brain ischemic tolerance by CIP. Furthermore, we tested the role of PPARγ in regulating Klotho expression after CIP. CIP caused PPARγ protein translocation to the nucleus in neurons in the CA1 region of the hippocampus. Pretreatment with GW9962, a PPARγ inhibitor, significantly attenuated the upregulation of Klotho protein and blocked the brain ischemic tolerance induced by CIP. Taken together, it can be concluded that Klotho upregulation via PPARγ contributes to the induction of brain ischemic tolerance by CIP.

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Data Availability

The data used in the present study are available from the corresponding author on reasonable request.

Abbreviations

BCCAs:

Bilateral common carotid arteries

CIP:

Cerebral ischemic preconditioning for 3 min

d:

Day

h:

Hour

i.c.v.:

Intracerebroventricular injection

II:

Ischemic insult for 8 min

KL:

Klotho

min:

Minute

PPARγ:

Peroxisome proliferator-activated receptor gamma

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Acknowledgements

This work was supported by the Natural Science Foundation of Hebei Province (Nos. H2021206160, H2022206579) and the National Natural Science Foundation of China (No. 81971228).

Funding

Innovative Research Group Project of the National Natural Science Foundation of China,81771253,Min Zhang,81971228,Min Zhang,Natural Science Foundation of Hebei Province,H201906702,Min Zhang,the Natural Science Foundation of Hebei Province,H2021206160,Min Zhang

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Authors

Contributions

LYZ, XYL and ACS performed the experiments. LYZ and XYL analyzed the data and drafted the manuscript. YYH and XHX drafted the figures. MZ, JGZ and WBL designed the study and contributed to editing the final draft. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Min Zhang.

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The authors declare no potential conflicts of interest.

Ethical Approval

All animals in this study were approved by the Laboratory Animal Ethical and Welfare Committee of Hebei Medical University, China (Approval No. IACUC-Hebmu–2020013).

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Zhang, LY., Liu, XY., Su, Ac. et al. Klotho Upregulation via PPARγ Contributes to the Induction of Brain Ischemic Tolerance by Cerebral Ischemic Preconditioning in Rats. Cell Mol Neurobiol 43, 1355–1367 (2023). https://doi.org/10.1007/s10571-022-01255-y

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  • DOI: https://doi.org/10.1007/s10571-022-01255-y

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