Abstract
Obesity has been identified as an independent risk factor for cardiovascular disease. Recent reports have highlighted the significance of stimulator of interferon genes (STING)-NOD-like receptor protein 3 (NLRP3) signaling pathway mediated pyroptosis, and inflammation in cardiovascular disease. Previous studies have demonstrated that exercise training effectively prevents cardiac pyroptosis and inflammation in high-fat diet (HFD)-fed mice. However, it is currently unknown whether exercise reduces pyroptosis and inflammation in obese hearts by targeting the STING-NLRP3 signaling pathway. We investigated the impact of an 8-week aerobic exercise regimen on cardiac function, pyroptosis, inflammation, and the STING-NLRP3 signaling pathway in HFD-induced obese mice. Additionally, to explore the underlying mechanism of STING in exercise-mediated cardioprotection, we administered intraperitoneal injections of the STING agonist diABZI to the mice. Furthermore, to investigate the role of the STING-NLRP3 signaling pathway in HFD-induced cardiac dysfunction, we administered adeno-associated virus 9 (AAV9) encoding shRNA targeting STING (shRNA-STING) via tail vein injection to knockdown STING expression specifically in mouse hearts. After one week of AAV9 injection, we intraperitoneally injected nigericin as an NLRP3 agonist. We first found that aerobic exercise effectively suppressed HFD-mediated upregulation of STING and NLRP3 in the hearts. Moreover, we demonstrated that the protective effect of aerobic exercise in HFD-induced cardiac dysfunction, pyroptosis, and inflammation was impaired by stimulating the STING pathway using diABZI. Additionally, activation of the NLRP3 with nigericin abolished the ameliorative effect of STING deficiency in HFD-induced cardiac dysfunction, pyroptosis, and inflammation. Based on these findings, we concluded that 8-week aerobic exercise alleviates HFD-induced cardiac dysfunction, pyroptosis, and inflammation by targeting STING-NLRP3 signaling pathway. Inhibition of STING-NLRP3 signaling pathway may serve as a promising therapeutic strategy against obesity-induced cardiomyopathy.
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Data availability
The datasets used and analyzed during the current study are available upon request by contacting with the corresponding author.
Abbreviations
- HFD:
-
High-fat diet
- STING:
-
Stimulator of interferon genes
- NLRP3:
-
NOD-like receptor protein 3
- AE:
-
Aerobic exercise
- ASC:
-
Apoptosis-associated speck-like protein
- GSDMD:
-
Gasdermin D
- IL-1β:
-
Interleukin-1β
- ND:
-
Normal diet
- AAV9:
-
Adeno-associated virus 9
- LVIDd:
-
Left ventricle internal dimension diastole
- LVIDs:
-
Left ventricle internal dimension systole
- EF:
-
Ejection fraction
- FS:
-
Fractional shortening
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Acknowledgements
This work is particularly supported by Taiyuan University of Technology high-level talent scientific research funding.
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This study was supported by Science and Technology Service Project of Winter Sports Management Center of General Administration of Sport of China (No. 20212001045) and Taiyuan University of Technology high-level talent scientific research funding.
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ZX and BZ researched and designed the experiment. ZX and ZM performed the experiment and analyzed the data. ZX, XZ, and BZ contributed reagents and materials. ZX wrote and edited the manuscript. All authors have read and critically revised the manuscript and approved the final version.
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Supplementary file1 (DOCX 27 KB)—Table S1 Aerobic exercise protocol. Table S2 Biometric and echocardiographic measurements in experimental mice. Table S3 Primer sequences used for Real-Time qPCR.
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Xu, Z., Ma, Z., Zhao, X. et al. Aerobic exercise mitigates high-fat diet-induced cardiac dysfunction, pyroptosis, and inflammation by inhibiting STING-NLRP3 signaling pathway. Mol Cell Biochem (2024). https://doi.org/10.1007/s11010-024-04950-0
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DOI: https://doi.org/10.1007/s11010-024-04950-0