中国病理生理杂志2025，Vol.41Issue(7)：1354-1364,11.DOI:10.3969/j.issn.1000-4718.2025.07.012
Sirt6通过Nrf2/HO-1信号途径抑制铁死亡并延缓D-Gal诱导的小鼠骨骼肌衰老
Sirt6 inhibits ferroptosis and attenuates D-Gal-induced skeletal muscle aging in mice via Nrf2/HO-1 signaling pathway
摘要
Abstract
AIM:To investigate the regulatory mechanism of silent information regulator 6(Sirt6)on nuclear factor E2-related factor 2(Nrf2)/heme oxygenase-1(HO-1)signaling pathway and ferroptosis in skeletal muscle aging in-duced by D-galactose(D-Gal)in mice.METHODS:A D-Gal-induced mouse aging model was established and randomly divided into control and D-Gal groups.In vitro,D-Gal-treated C2C12 mouse myoblasts were treated with ferroptosis ago-nist erastin(Era)and inhibitor ferrostatin-1(Fer-1),Sirt6 agonist MDL-800 and inhibitor OSS-128167,and Nrf2 siRNA.Mouse body weight and forelimb relative grip strength were monitored.RT-qPCR and Western blot were used to measure the expression of Sirt6,Nrf2,HO-1,P53,P21,P16,muscle ring finger protein 1,muscle atrophy F-box,solute carrier family 7 member 11,and glutathione peroxidase 4 in gastrocnemius muscle and myoblasts.Hematoxylin-eosin staining was performed to examine muscle fiber diameter.Levels of reactive oxygen species(ROS),mitochondrial ROS,mitochon-drial membrane potential,senescence-associated β-galactosidase activity,glutathione,lipid peroxidation,and Fe²⁺ con-centration were measured in myoblasts and myotubes.Immunofluorescence staining was used to detect myosin heavy chain(MyHC)expression in myotubes.RESULTS:Mice in the D-Gal group exhibited significant reductions in body weight and forelimb grip strength(P<0.01),upregulation of aging and muscle atrophy markers,and decreased mRNA and pro-tein levels of ferroptosis markers and Sirt6(P<0.01).Additionally,gastrocnemius muscle fiber diameter significantly de-creased(P<0.01).In D-Gal-treated myoblasts and myotubes,aging and muscle atrophy markers were elevated(P<0.01),MyHC expression was reduced,and protein levels of ferroptosis-related markers,Sirt6,Nrf2,and HO-1 were de-creased(P<0.05 or P<0.01).Fer-1 pre-treatment alleviated these changes(P<0.05 or P<0.01).MDL-800 significantly improved D-Gal-induced aging and muscle atrophy in myoblasts and myotubes,while increasing the expression of ferropto-sis-related proteins(P<0.05 or P<0.01).However,the addition of Erastin abolished the beneficial effects of MDL-800(P<0.05 or P<0.01).Following Nrf2 siRNA transfection,the ability of MDL-800 to improve ferroptosis and the quality of myotube formation was significantly diminished(P<0.05 or P<0.01).CONCLUSION:Sirt6 inhibits ferroptosis in myo-blasts through the Nrf2/HO-1 signaling pathway,thereby alleviating age-related changes in myoblasts and the decline in myotube formation quality,which is beneficial for improving skeletal muscle aging.关键词
肌少症/铁死亡/骨骼肌衰老/沉默信息调节因子6/Nrf2/HO-1信号通路/氧化应激Key words
sarcopenia/ferroptosis/skeletal muscle aging/silent information regulator 6/Nrf2/HO-1 signaling pathway/oxidative stress分类
医药卫生引用本文复制引用
王淦民,王瑶,陈士坤,段晨阳,王雨嫣,刘小溯,侯东尧,杜权..Sirt6通过Nrf2/HO-1信号途径抑制铁死亡并延缓D-Gal诱导的小鼠骨骼肌衰老[J].中国病理生理杂志,2025,41(7):1354-1364,11.基金项目
重庆市出国留学人员创新自主项目(No.CX2021069) （No.CX2021069）
重庆科卫联合项目(No.2020MSXM008) （No.2020MSXM008）
重庆市研究生科研创新项目(No.CYS23334) （No.CYS23334）
