橙皮素通过激活SIRT1/NRF2信号改善阿霉素诱导的H9c2细胞毒性
Hesperetin Alleviates Doxorubicin-Induced Cytotoxicity in H9c2 Cells by Activating SIRT1/NRF2 Signaling
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摘要:目的 本研究旨在探讨橙皮素(hesperetin, Hes)能否通过调控沉默信息调节因子1(silent information regulator 1, SIRT1)/核转录因子E2相关因子2(nuclear transcription factor E2-related factor 2, NRF2)信号减轻氧化应激改善阿霉素(doxorubicin, DOX)诱导的H9c2心肌细胞毒性。方法 采用DOX诱导的H9c2心肌细胞毒性模型,随机分为4组:对照组(Control)、DOX处理组(DOX)、Hes加DOX处理组(DOX+Hes)以及Hes加SIRT1抑制剂EX527联合DOX处理组(DOX+Hes+EX527)。光镜下观察细胞形态,CCK-8检测各组细胞活力,流式细胞术检测各组细胞凋亡率,DCFH-DA染色观察各组ROS水平,ELISA试剂盒检测乳酸脱氢酶(lactic dehydrogenase, LDH)、超氧化物歧化酶(superoxide dismutase, SOD)、过氧化氢酶(catalase, CAT)和SIRT1活性以及丙二醛(malondialdehyde, MDA)含量,Western blot检测裂解的caspase-3(cleaved caspase-3)、细胞色素c(cytochrome c)、SIRT1、Ac-FOXO1、NRF2和血红素加氧酶1(heme oxygenase 1, HO-1)的表达。结果 和Control组相比,DOX组细胞形态肿胀,密度减小,细胞活力降低,培养基中LDH活性增加(P<0.01);细胞凋亡增多,cleaved caspase-3和cytochrome c表达增加(P<0.01);CAT和SOD活性降低,MDA含量和ROS水平增加(P<0.01);SIRT1、NRF2和HO-1表达以及SIRT1活性降低,Ac-FOXO1表达增加(P<0.01);与DOX组相比,DOX+Hes组细胞形态改善,密度和细胞活力增加,培养基中LDH活性降低(P<0.01);细胞凋亡减少,cleaved caspase-3和cytochrome c表达降低(P<0.01);CAT和SOD活性升高,MDA含量和ROS水平降低(P<0.01);SIRT1、NRF2和HO-1表达以及SIRT1活性增加,Ac-FOXO1表达降低(P<0.01);而与DOX+Hes组相比,EX527阻断Hes对DOX诱导的H9c2细胞损伤、氧化应激和SIRT1/NRF2信号的作用。结论 Hes可以通过调控SIRT1/NRF2信号抑制氧化应激和细胞凋亡减轻DOX诱导的H9c2心肌细胞毒性。Abstract:Objective To investigate whether hesperetin (Hes) alleviates doxorubicin (DOX)-induced cardiomyocytotoxicity by reducing oxidative stress via regulating silent information regulator 1 (SIRT1)/nuclear transcription factor E2-related factor 2 (NRF2) signaling in H9c2 cells.Methods H9c2 cells were treated with DOX to establish the cardiotoxicity model and were randomly assigned to four groups, a control group (Control) and three treatment groups, receiving respectively DOX (the DOX group), Hes+DOX (the DOX+Hes group), and Hes+SIRT1 inhibitor EX527+DOX (the DOX+Hes+EX527 group). Cellular morphology was observed by the light microscope. Cell viability was evaluated by CCK-8. DOX-induced apoptosis in H9c2 cells was examined by flow cytometry. The levels of reactive oxygen species (ROS) in the H9c2 cells of the four groups were determied with 2'-7'-dichlorodihydrofluorescein diacetate (DCFH-DA) staining. The activities of lactate dehydrogenase (LDH), superoxide dismutase (SOD), catalase (CAT), and SIRT1 as well as the malondialdehyde (MDA) content were measured using ELISA kits. The expressions of cleaved caspase-3, cytochrome c, SIRT1, Ac-FOXO1, NRF2, and heme oxygenase 1 (HO-1) were determined by Western blot.Results Compared with the Control group, the DOX group showed swollen cellular morphology, decreased cell density and viability, and increased LDH activity in the medium (P<0.01); both apoptosis and the expression of cleaved caspase-3 and cytochrome c increased (P<0.01); the activities of CAT and SOD decreased while the contents of MDA and ROS increased (P<0.01); the expression of SIRT1, NRF2, and HO-1 decreased, the activity of SIRT1 decreased, and the expression of Ac-FOXO1 increased (P<0.01). Compared with the DOX group, the DOX+Hes group showed improved cellular morphology, increased cell density and viability, and decreased LDH activity in the medium (P<0.01); the apoptosis and the expression of cleaved caspase-3 and cytochrome c decreased (P<0.01); the activities of CAT and SOD increased while the levels of MDA and ROS decreased (P<0.01); the expression of SIRT1, NRF2, and HO-1 increased, the activity of SIRT1 increased, and the expression of Ac-FOXO1 decreased (P<0.01). Comparison of the findings for the DOX+Hes group and the DOX+Hes+EX527 group showed that EX527 could block the protective effects of Hes against DOX-induced cell injury, oxidative stress, and SIRT1/NRF2 signaling.Conclusion Hes inhibits oxidative stress and apoptosis via regulating SIRT1/NRF2 signaling, thereby reducing DOX-induced cardiotoxicity in H9c2 cells.
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