Abstract
Aluminum is well recognized as a nephrotoxic agent. Its hazardous effects arise from the high risk of daily exposure. The consumption of fructose also represents a critical health issue that might negatively impact different organs, including the kidneys. To pursue our previous work, this study aimed to investigate the potential renoprotective effects of glycyrrhizic acid (GLYA) on aluminum-induced nephrotoxicity in insulin-resistant rats. Insulin resistance (IR) was induced by adding fructose (10%) in drinking water for 18 weeks. Male Wistar rats were divided into five groups: control (CTRL), aluminum chloride (ALM, 34 mg/kg/day), fructose (FRCT), aluminum plus fructose (AL/FR), and GLYA (rats received AL/FR and treated with 40 mg/kg GLYA daily). AL/FR resulted in abnormal renal function tests and renal tissue injury. This was associated with increased oxidative stress and inflammation in the renal tissue. Moreover, the expressions of the toll-like receptor 4 (TLR4) and its adaptor proteins were increased in AL/FR group. The administration of GLYA mollified AL/FR-induced renal injury, oxidative stress, activation of the TLR4 signaling pathway, and inflammation. In conclusion, we provide evidence for the promising renoprotective effect of GLYA against AL/FR-induced kidney damage in rats. The renoprotection is attributed to the suppression of oxidative stress and inhibition of the TLR4/NF-κB signaling pathway in the kidneys.
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Acknowledgments
The authors acknowledge Dr. Rehab Hasan, Department of Histology, Faculty of Medicine, Al-Azhar University, Egypt, for her great effort in the histopathological examination.
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MFM, HME, and AAAM conceived and designed research. NAE conducted the experiments. NAE and AAAM analyzed the data. NAE and AAAM wrote the first draft of manuscript. MFM, HME, and AAAM revised and edited the manuscript. All the authors read and approved the manuscript. The authors declare that all data were generated in-house and that no paper mill was used.
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The study protocol and animal handling procedures were approved by the Ethical Committee for Animal Handling at Zagazig University (ECAH ZU), Faculty of Pharmacy, Zagazig University, Egypt based on the recommendations of the Weatherall report.
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Emara, N.A., Mahmoud, M.F., El Fayoumi, H.M. et al. The renoprotective effect of glycyrrhizic acid in insulin-resistant rats exposed to aluminum involves the inhibition of TLR4/NF-κB signaling pathway. Naunyn-Schmiedeberg's Arch Pharmacol 394, 863–872 (2021). https://doi.org/10.1007/s00210-020-02012-y
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DOI: https://doi.org/10.1007/s00210-020-02012-y