Postmenopausal women,elderly individuals,and transfusion-dependent patients are prone to bone marrow iron overload,which is closely associated with iron overload-associated osteoporosis(IOOP).Currently,the treatment o...Postmenopausal women,elderly individuals,and transfusion-dependent patients are prone to bone marrow iron overload,which is closely associated with iron overload-associated osteoporosis(IOOP).Currently,the treatment of IOOP mainly focuses on promoting iron efflux and alleviating iron-induced damage,but the intervention value of natural active ingredients remains unclear.Naringenin(NAR),as a natural flavonoid,can regulate bone metabolism,yet its role and mechanism in IOOP have not been elucidated.In this study,an in vitro model was established by inducing MC3T3-E1 cells with ferric ammonium citrate(FAC),and an in vivo IOOP model was constructed by inducing mice with iron dextran to investigate the effects and mechanisms of NAR.The results showed that NAR improved the alkaline phosphatase(ALP)activity and mineralization capacity of FAC-induced iron-overloaded cells,upregulated the expression of collagen I(Col1a1)and runt-related transcription factor 2(Runx2),reduced the accumulation of reactive oxygen species(ROS)and lipid peroxide(LPO),attenuated mitochondrial membrane potential(MMP)impairment,and inhibited apoptosis.In in vivo experiments,NAR restored the density and quantity of trabecular bone in iron-overloaded mice.Mechanistically,RNA sequencing indicated that the effect of NAR was associated with transcription factor EB(Tfeb)-dependent transcription:NAR promoted Tfeb nuclear translocation and upregulated p62 transcription under iron overload conditions.Co-immunoprecipitation(Co-IP)demonstrated that NAR enhanced the binding of p62 to kelch-like ECH associated protein 1(Keap1),while increasing Nrf2 phosphorylation and upregulating its key effector proteins HO-1 and NQO1.Functional validation showed that the Nrf2 antagonist ML385 or siRNA could block the effects of NAR without affecting Tfeb expression,whereas the Tfeb inhibitor eltrombopag simultaneously inhibited Nrf2 expression and NAR-induced effects.In conclusion,NAR alleviates iron overload-induced oxidative damage and osteogenic disorders via the Tfeb/p62/Nrf2 pathway,suggesting that it may serve as a potential therapeutic agent for IOOP.展开更多
Background:Circular RNAs(circRNAs)play a crucial role in the progression of malignant tumors such as breast cancer.Methods:A circRNA microarray was used to detect key circRNAs in breast cancer.Expression of Circ72688 ...Background:Circular RNAs(circRNAs)play a crucial role in the progression of malignant tumors such as breast cancer.Methods:A circRNA microarray was used to detect key circRNAs in breast cancer.Expression of Circ72688 was verified by quantitative reverse transcription PCR(qRT-PCR)and fluorescence in situ hybridization(FISH)assay.Transwell assay and in vivo assay were conducted to prove the function of Circ72688.Exploring the downstream mechanism,dual-luciferase reporter assay,western blotting,and tissue microarray were performed.Results:We sequenced and identified a circRNA,hsa-circ-0072688,also known as Circ72688.Our research found that Circ72688 enhanced tumor metastasis both in vivo and in vitro.Mechanistically,Circ72688 acted as a molecular sponge for hsa-miR-654-5p,thereby affecting the transcription of ORAI2.The expression levels of Circ72688 and ORAI2 were significantly higher in breast cancer tissues compared to adjacent normal tissues,and a notable positive correlation could be seen between them.Conclusions:In summary,our study demonstrated the critical role of Circ72688 in breast cancer invasion and metastasis,and how Circ72688 partially regulated ORAI2 through hsa-miR-654-5p.Targeting Circ72688 might be a potential therapeutic strategy for breast cancer.展开更多
P2型层状过渡金属氧化物(P2-NaxTMO2)因其优异的循环稳定性和倍率性能,成为钠离子电池正极材料的有力候选者。然而,其在高电压下的不可逆相变和固有低理论容量问题,阻碍了实际应用。本研究工作提出高熵策略与双相结构的协同设计...P2型层状过渡金属氧化物(P2-NaxTMO2)因其优异的循环稳定性和倍率性能,成为钠离子电池正极材料的有力候选者。然而,其在高电压下的不可逆相变和固有低理论容量问题,阻碍了实际应用。本研究工作提出高熵策略与双相结构的协同设计来克服这些挑战。通过在P2相高熵基体中引入O3相,构建新型P2/O3双相高熵层状氧化物Na0.70Ni0.25Mn0.35Co0.15Fe0.05Ti0.20O2(简称Na0.70NMCFT)。其中,高熵设计通过构型熵稳定效应有效抑制P2相的不可逆相变,而O3相则通过协同作用弥补容量不足并提升循环稳定性。此外,双相组分之间的相互作用进一步促进P2-O3与P2-P3相变的高度可逆性。Na0.70NMCFT在1C倍率下的初始放电容量为102.08 mAhg-1,200次循环后容量保持率达88.15%,表明具有优异的循环稳定性。更重要的是,即使在10C的高倍率下,Na0.70NMCFT仍能提供85.67 mAh g-1的初始放电比容量,并在1000次循环后容量保持率达70%。本工作证实双相高熵设计在提升钠离子电池正极性能中的关键作用,为开发先进钠离子电池正极材料提供了新思路。展开更多
Layered oxides have attracted significant attention as cathodes for sodium-ion batteries(SIBs)due to their compositional versatility and tuneable electrochemical performance.However,these materials still face challeng...Layered oxides have attracted significant attention as cathodes for sodium-ion batteries(SIBs)due to their compositional versatility and tuneable electrochemical performance.However,these materials still face challenges such as structural phase transitions,Na+/vacancy ordering,and Jahn–Teller distortion effect,resulting in severe capacity decay and sluggish ion kinetics.We develop a novel Cu/Y dual-doping strategy that leads to the formation of"Na–Y"interlayer aggregates,which act as structural pillars within alkali metal layers,enhancing structural stability and disrupting the ordered arrangement of Na+/vacancies.This disruption leads to a unique coexistence of ordered and disordered Na+/vacancy states with near-zero strain,which significantly improves Na+diffusion kinetics.This structural innovation not only mitigates the unfavorable P2–O2 phase transition but also facilitates rapid ion transport.As a result,the doped material demonstrates exceptional electrochemical performance,including an ultra-long cycle life of 3000 cycles at 10 C and an outstanding high-rate capability of~70 mAh g−1at 50 C.The discovery of this novel interlayer pillar,along with its role in modulating Na+/vacancy arrangements,provides a fresh perspective on engineering layered oxides.It opens up promising new pathways for the structural design of advanced cathode materials toward efficient,stable,and high-rate SIBs.展开更多
基金supported by the Guangzhou Municipal Science and Technology Program(No.2023B03J0056)the Natural Science Foundation of Guangdong Province(Nos.2024A1515012062 and 2021A1515010725)the Scientific Research Project of Guangdong Provincial Bureau of Traditional Chinese Medicine(No.20254028).
摘要Postmenopausal women,elderly individuals,and transfusion-dependent patients are prone to bone marrow iron overload,which is closely associated with iron overload-associated osteoporosis(IOOP).Currently,the treatment of IOOP mainly focuses on promoting iron efflux and alleviating iron-induced damage,but the intervention value of natural active ingredients remains unclear.Naringenin(NAR),as a natural flavonoid,can regulate bone metabolism,yet its role and mechanism in IOOP have not been elucidated.In this study,an in vitro model was established by inducing MC3T3-E1 cells with ferric ammonium citrate(FAC),and an in vivo IOOP model was constructed by inducing mice with iron dextran to investigate the effects and mechanisms of NAR.The results showed that NAR improved the alkaline phosphatase(ALP)activity and mineralization capacity of FAC-induced iron-overloaded cells,upregulated the expression of collagen I(Col1a1)and runt-related transcription factor 2(Runx2),reduced the accumulation of reactive oxygen species(ROS)and lipid peroxide(LPO),attenuated mitochondrial membrane potential(MMP)impairment,and inhibited apoptosis.In in vivo experiments,NAR restored the density and quantity of trabecular bone in iron-overloaded mice.Mechanistically,RNA sequencing indicated that the effect of NAR was associated with transcription factor EB(Tfeb)-dependent transcription:NAR promoted Tfeb nuclear translocation and upregulated p62 transcription under iron overload conditions.Co-immunoprecipitation(Co-IP)demonstrated that NAR enhanced the binding of p62 to kelch-like ECH associated protein 1(Keap1),while increasing Nrf2 phosphorylation and upregulating its key effector proteins HO-1 and NQO1.Functional validation showed that the Nrf2 antagonist ML385 or siRNA could block the effects of NAR without affecting Tfeb expression,whereas the Tfeb inhibitor eltrombopag simultaneously inhibited Nrf2 expression and NAR-induced effects.In conclusion,NAR alleviates iron overload-induced oxidative damage and osteogenic disorders via the Tfeb/p62/Nrf2 pathway,suggesting that it may serve as a potential therapeutic agent for IOOP.
基金supported by the Guangzhou Science and Technology Bureau[202002020002].
摘要Background:Circular RNAs(circRNAs)play a crucial role in the progression of malignant tumors such as breast cancer.Methods:A circRNA microarray was used to detect key circRNAs in breast cancer.Expression of Circ72688 was verified by quantitative reverse transcription PCR(qRT-PCR)and fluorescence in situ hybridization(FISH)assay.Transwell assay and in vivo assay were conducted to prove the function of Circ72688.Exploring the downstream mechanism,dual-luciferase reporter assay,western blotting,and tissue microarray were performed.Results:We sequenced and identified a circRNA,hsa-circ-0072688,also known as Circ72688.Our research found that Circ72688 enhanced tumor metastasis both in vivo and in vitro.Mechanistically,Circ72688 acted as a molecular sponge for hsa-miR-654-5p,thereby affecting the transcription of ORAI2.The expression levels of Circ72688 and ORAI2 were significantly higher in breast cancer tissues compared to adjacent normal tissues,and a notable positive correlation could be seen between them.Conclusions:In summary,our study demonstrated the critical role of Circ72688 in breast cancer invasion and metastasis,and how Circ72688 partially regulated ORAI2 through hsa-miR-654-5p.Targeting Circ72688 might be a potential therapeutic strategy for breast cancer.
摘要P2型层状过渡金属氧化物(P2-NaxTMO2)因其优异的循环稳定性和倍率性能,成为钠离子电池正极材料的有力候选者。然而,其在高电压下的不可逆相变和固有低理论容量问题,阻碍了实际应用。本研究工作提出高熵策略与双相结构的协同设计来克服这些挑战。通过在P2相高熵基体中引入O3相,构建新型P2/O3双相高熵层状氧化物Na0.70Ni0.25Mn0.35Co0.15Fe0.05Ti0.20O2(简称Na0.70NMCFT)。其中,高熵设计通过构型熵稳定效应有效抑制P2相的不可逆相变,而O3相则通过协同作用弥补容量不足并提升循环稳定性。此外,双相组分之间的相互作用进一步促进P2-O3与P2-P3相变的高度可逆性。Na0.70NMCFT在1C倍率下的初始放电容量为102.08 mAhg-1,200次循环后容量保持率达88.15%,表明具有优异的循环稳定性。更重要的是,即使在10C的高倍率下,Na0.70NMCFT仍能提供85.67 mAh g-1的初始放电比容量,并在1000次循环后容量保持率达70%。本工作证实双相高熵设计在提升钠离子电池正极性能中的关键作用,为开发先进钠离子电池正极材料提供了新思路。
基金supported by the “Pioneer” and “Leading Goose” R&D Program of Zhejiang Province of China (No. 2024C01056)the support from London South Bank University
摘要Layered oxides have attracted significant attention as cathodes for sodium-ion batteries(SIBs)due to their compositional versatility and tuneable electrochemical performance.However,these materials still face challenges such as structural phase transitions,Na+/vacancy ordering,and Jahn–Teller distortion effect,resulting in severe capacity decay and sluggish ion kinetics.We develop a novel Cu/Y dual-doping strategy that leads to the formation of"Na–Y"interlayer aggregates,which act as structural pillars within alkali metal layers,enhancing structural stability and disrupting the ordered arrangement of Na+/vacancies.This disruption leads to a unique coexistence of ordered and disordered Na+/vacancy states with near-zero strain,which significantly improves Na+diffusion kinetics.This structural innovation not only mitigates the unfavorable P2–O2 phase transition but also facilitates rapid ion transport.As a result,the doped material demonstrates exceptional electrochemical performance,including an ultra-long cycle life of 3000 cycles at 10 C and an outstanding high-rate capability of~70 mAh g−1at 50 C.The discovery of this novel interlayer pillar,along with its role in modulating Na+/vacancy arrangements,provides a fresh perspective on engineering layered oxides.It opens up promising new pathways for the structural design of advanced cathode materials toward efficient,stable,and high-rate SIBs.