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Abstract: doxorubicin (DOX) is a commonly administered chemotherapy drug for treating hematological malignancies and solid tumors; however, its clinical application is limited by significant cardiotoxicity. cynaroside (Cyn) is a flavonoid glycoside distributed in honeysuckle, with confirmed potential biological functions in regulating inflammation, pyroptosis, and oxidative stress. Herein, the effects of Cyn were evaluated in a DOX-induced cardiotoxicity (DIC) mouse model, which was established by intraperitoneal injections of DOX (5 mg/kg) once a week for three weeks. The mice in the treatment group received dexrazoxane, MCC950, and Cyn every two days. Blood biochemistry, histopathology, immunohistochemistry, reverse transcription-quantitative polymerase chain reaction (RT-qPCR), and western blotting were conducted to investigate the cardioprotective effects and potential mechanisms of Cyn treatment. The results demonstrated the significant benefits of Cyn treatment in mitigating DIC; it could effectively alleviate oxidative stress to a certain extent, maintain the equilibrium of cell apoptosis, and enhance the cardiac function of mice. These effects were realized via regulating the transcription levels of pyroptosis-related genes, such as nucleotide-binding oligomerization domain-like receptor protein 3 (NLRP3), caspase-1, and gasdermin D (GSDMD). Mechanistically, for DOX-induced myocardial injury, Cyn could significantly modulate the expression of pivotal genes, including adenosine monophosphate-activated protein kinase (AMPK), peroxisome proliferator-activated receptor γ coactivator-1α (PGC-1α), sirtuin 3 (SIRT3), and nuclear factor erythroid 2-related factor 2 (Nrf2). We attribute it to the mediation of AMPK/SIRT3/Nrf2 pathway, which plays a central role in preventing DOX-induced cardiomyocyte injury. In conclusion, the present study confirms the therapeutic potential of Cyn in DIC by regulating the AMPK/SIRT3/Nrf2 pathway.

木犀草苷通过调节AMPK/SIRT3/Nrf2通路抑制阿霉素诱导的心肌细胞焦亡

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