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The IL-6/STAT Signaling Pathway and PPARα Are Involved in Mediating the Dose-Dependent Cardioprotective Effects of Fenofibrate in 5-Fluorouracil-Induced Cardiotoxicity

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Abstract

Purpose

The cardiotoxicity of anticancer drugs such as 5-fluorouracil (5FU) is a major complication that challenges their clinical usefulness. Thus there is a critical need to find new protective drugs to defend against these harmful side effects. Up to now, there have been no studies evaluating the possible cardioprotective effects of fenofibrate (FEN) in 5FU-induced cardiotoxicity. Therefore, we aimed in the current model to evaluate such an effect of FEN and to explore different mechanisms mediating it.

Methods

We used FEN (25, 50, 100 mg/kg/day) administered orally for 7 days with induction of cardiotoxicity by intraperitoneal (i.p.) injection of 5FU (150 mg/kg) on the fifth day.

Results

The current study showed that 5FU succeeded in inducing cardiotoxicity, manifested by significantly elevated levels of cardiac enzymes, tissue malondialdehyde (MDA), interleukin 6 (IL-6), signal transducer and activator of transcription 4 (STAT4), and caspase-3. Furthermore, the 5FU group showed toxic histopathological changes including marked cardiac damage and a significant decrease in reduced glutathione (GSH), total antioxidant capacity (TAC), and peroxisome proliferator-activated receptor alpha (PPARα) expression. FEN reversed 5FU-induced cardiotoxicity by various mechanisms including upregulation of PPARα, inhibition of the IL-6/STAT signaling pathway, and anti-inflammatory, antiapoptotic, and antioxidant properties.

Conclusion

FEN demonstrated a significant cardioprotective effect against 5FU-induced cardiac damage.

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Data Availability

All data are available in Prism files as supplementary material.

Code Availability

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Acknowledgements

All our thanks and appreciation to Dr. Wedad M. Abdelraheem, Department of Medical Microbiology and Immunology, Faculty of Medicine, Minia University, El-Minia, Egypt, for helping us in the rt-PCR part.

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Authors and Affiliations

Authors

Contributions

Dr. Marwa, Dr. Walaa and Dr. Sayed selected the point, performed the experimental part, wrote the manuscript, and submitted it for publication. Dr. Nashwa performed and wrote the histopathology and immunohistochemistry, and revised the manuscript. Dr. Asmaa performed and wrote the part on western blotting and revised the manuscript.

Corresponding author

Correspondence to Marwa M. M. Refaie.

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Ethics

Animal handling, medications, and animal euthanasia were carried out following the guidelines for the care of experimental animals and approved by the Institutional Ethical Committee, Faculty of Medicine, Minia University, Egypt, according to the NIH Guide for the Care and Use of Laboratory Animals. Approval No. 19:3/2021.

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The authors declare that they have no conflict of interest.

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Refaie, M.M.M., Shehata, S., Bayoumi, A.M.A. et al. The IL-6/STAT Signaling Pathway and PPARα Are Involved in Mediating the Dose-Dependent Cardioprotective Effects of Fenofibrate in 5-Fluorouracil-Induced Cardiotoxicity. Cardiovasc Drugs Ther 36, 817–827 (2022). https://doi.org/10.1007/s10557-021-07214-x

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