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白杨素通过抑制氧化应激、炎症和细胞凋亡来减轻大鼠急性多柔比星心脏毒性。

Chrysin alleviates acute doxorubicin cardiotoxicity in rats via suppression of oxidative stress, inflammation and apoptosis.

机构信息

Department of Pharmacology & Toxicology, Faculty of Pharmacy, Ain Shams University, Abasia, Cairo, Egypt.

Department of Pharmacology & Therapeutics, Faculty of Medicine, Ain Shams University, Cairo, Egypt.

出版信息

Eur J Pharmacol. 2014 Apr 5;728:107-18. doi: 10.1016/j.ejphar.2014.01.065. Epub 2014 Feb 6.

Abstract

Doxorubicin (DOX) is one of the most effective chemotherapeutic drugs; however, its incidence of cardiotoxicity compromises its therapeutic index. Chrysin, a natural flavone, possesses multiple biological activities, such as antioxidant, anti-inflammatory and anti-cancer. The present study was designed to investigate whether chrysin could protect against DOX-induced acute cardiotoxicity; and if so, unravel the molecular mechanisms of this protective effect. Chrysin was administered to male albino rats once daily for 12 consecutive days at doses of 25 and 50mg/kg orally. DOX (15 mg/kg; i.p.) was administered on day 12. Chrysin pretreatment significantly protected against DOX-induced myocardial damage which was characterized by conduction abnormalities, increased serum creatine kinase isoenzyme-MB (CK-MB), and lactate dehydrogenase (LDH) and myofibrillar disarrangement. As indicators of oxidative stress, DOX caused significant glutathione depletion, lipid peroxidation and reduction in activities of antioxidant enzymes; catalase (CAT) and superoxide dismutase (SOD). Chrysin pretreatment significantly attenuated DOX-induced oxidative injury. Additionally, DOX provoked inflammatory responses by increasing the expressions of nuclear factor kappa-B (NF-κB), inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) and the levels of tumor necrosis factor-alpha (TNF-α) and nitric oxide while chrysin pretreatment significantly inhibited these inflammatory responses. Furthermore, DOX induced apoptotic tissue damage by increasing Bax and cytochrome c expressions and caspase-3 activity while decreasing the expression of Bcl-2. Chrysin pretreatment significantly ameliorated these apoptotic actions of DOX. Collectively, these findings indicate that chrysin possesses a potent protective effect against DOX-induced acute cardiotoxicity via suppressing oxidative stress, inflammation and apoptotic tissue damage.

摘要

阿霉素(DOX)是最有效的化疗药物之一;然而,其心脏毒性的发生率降低了其治疗指数。白杨素,一种天然黄酮类化合物,具有多种生物学活性,如抗氧化、抗炎和抗癌作用。本研究旨在探讨白杨素是否能预防 DOX 引起的急性心脏毒性;如果是这样,阐明这种保护作用的分子机制。白杨素以 25 和 50mg/kg 剂量每天口服一次,连续 12 天给予雄性白化大鼠。第 12 天给予 DOX(15mg/kg;腹腔注射)。白杨素预处理显著保护 DOX 引起的心肌损伤,表现为传导异常、血清肌酸激酶同工酶-MB(CK-MB)和乳酸脱氢酶(LDH)升高,肌原纤维排列紊乱。作为氧化应激的指标,DOX 导致谷胱甘肽耗竭、脂质过氧化和抗氧化酶活性降低;过氧化氢酶(CAT)和超氧化物歧化酶(SOD)。白杨素预处理显著减轻 DOX 引起的氧化损伤。此外,DOX 通过增加核因子 kappa-B(NF-κB)、诱导型一氧化氮合酶(iNOS)和环氧化酶-2(COX-2)的表达以及肿瘤坏死因子-α(TNF-α)和一氧化氮的水平来引发炎症反应,而白杨素预处理显著抑制了这些炎症反应。此外,DOX 通过增加 Bax 和细胞色素 c 的表达和 caspase-3 活性,同时降低 Bcl-2 的表达,诱导细胞凋亡性组织损伤。白杨素预处理显著改善了 DOX 的这些凋亡作用。总之,这些发现表明,白杨素通过抑制氧化应激、炎症和凋亡性组织损伤,对 DOX 引起的急性心脏毒性具有很强的保护作用。

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