目的研究羟苯磺酸钙在高糖诱导的环境下对Müller细胞氧化损伤的保护作用及其机制。方法通过高糖诱导建立Müller细胞氧化损伤模型,并将细胞分为4组,即对照组(正常培养)、高糖组(35mmol/L葡萄糖培养基)、对照+羟苯磺酸钙组(常...目的研究羟苯磺酸钙在高糖诱导的环境下对Müller细胞氧化损伤的保护作用及其机制。方法通过高糖诱导建立Müller细胞氧化损伤模型,并将细胞分为4组,即对照组(正常培养)、高糖组(35mmol/L葡萄糖培养基)、对照+羟苯磺酸钙组(常规培养基础上加入0.5μmol/L羟苯磺酸钙)和高糖+羟苯磺酸钙组(高糖基础上加入0.5μmol/L羟苯磺酸钙)。使用CCK-8评估细胞增殖,流式细胞术检测细胞凋亡,试剂盒检测氧化应激指标,蛋白印迹技术检测内向整流钾离子通道4.1(inwardly rectifying K channel 4.1,Kir4.1)和水通道蛋白4(aquaporin-4,AQP4)蛋白水平。结果与对照组比较,高糖组Müller细胞增殖活性降低且凋亡率升高,细胞发生氧化应激,AQP4蛋白表达水平升高而Kir4.1蛋白表达水平降低(P<0.05)。与高糖组比较,高糖+羟苯磺酸钙组细胞增殖活性增加且凋亡率降低,细胞氧化应激损伤减轻,AQP4蛋白表达水平降低而Kir4.1蛋白表达水平升高(P<0.05)。结论羟苯磺酸钙可能通过调节AQP4/Kir4.1轴抑制高糖诱导的Müller细胞氧化损伤。展开更多
The modulation of charge transfer pathways within type-I heterojunctions through interfacial electric field(IEF)engineering is of critical importance in promoting photocatalytic hydrogen evolution,effectively facilita...The modulation of charge transfer pathways within type-I heterojunctions through interfacial electric field(IEF)engineering is of critical importance in promoting photocatalytic hydrogen evolution,effectively facilitating the separation of photogenerated charge carriers.In this study,we performed in-situ growth of two-dimensional ZnIn_(2)S_(4)nanosheets on MnCo_(2)O_(4.5)nanorods to construct an ohmic-like type-I ZnIn_(2)S_(4)/MnCo_(2)O_(4.5)heterojunction for efficient photocatalytic hydrogen evolution.This ohmic-like charge transfer mechanism effectively addresses the intrinsic limitations inherent to conventional type-I heterojunctions neglecting IEF effects,particularly through IEF-induced enhancement of charge separation efficiency.Consequently,the optimized ZnIn_(2)S_(4)/MnCo_(2)O_(4.5)photocatalyst demonstrates an outstanding photocatalytic hydrogen evolution rate of 20.9 mmol g^(−1)h^(−1),14.9 times that of the bare ZnIn_(2)S_(4).Furthermore,the ohmic-like charge transport behavior has been rigorously validated by integrated advanced experimental characterizations,including in-situ X-ray photoelectron spectroscopy(XPS),Kelvin probe force microscopy(KPFM),and surface photovoltage(SPV)measurements,which collectively provide robust evidence for the proposed mechanism.This work offers valuable insights into the design of high-efficient ohmic-like type-I heterojunction catalysts for photocatalytic H_(2)evolution.展开更多
多种真菌多糖近年来因其免疫调节活性成为保健食品领域研究的热点。本实验以食药用真菌蛹虫草提取物蛹虫草多糖(Cordyceps militaris polysaccharides,CMP)为研究材料,初步探究CMP对小鼠巨噬细胞RAW264.7免疫活性的调节机制。噻唑蓝实...多种真菌多糖近年来因其免疫调节活性成为保健食品领域研究的热点。本实验以食药用真菌蛹虫草提取物蛹虫草多糖(Cordyceps militaris polysaccharides,CMP)为研究材料,初步探究CMP对小鼠巨噬细胞RAW264.7免疫活性的调节机制。噻唑蓝实验结果显示CMP无细胞毒性,且100、200μg/mL CMP可以明显增强RAW264.7细胞活性;中性红法、Griess法和酶联免疫吸附检测结果表明25～200μg/mL的CMP以剂量依赖方式增强RAW264.7细胞吞噬活性并增加一氧化氮(nitric oxide,NO)和白介素-1β(interleukin-1β,IL-1β)分泌,肿瘤坏死因子-α(tumor necrosisfactor-α,TNF-α)的分泌呈先升高后降低的趋势,在100μg/mL时达到最高值;抑制剂中和实验结果显示当Toll样受体4(Toll-like receptors 4,TLR4)和甘露糖受体(mannose receptor,MR)受到抑制时,CMP诱导的RAW264.7免疫反应显著降低,这表明TLR4和MR均为CMP激活巨噬细胞的受体;此外,Western blot结果显示丝裂原活化蛋白激酶(mitogen-activated protein kinases,MAPK)信号通路也参与CMP诱导的RAW264.7细胞分泌NO、TNF-α和IL-1β。表明TLR4和MR/MAPK信号传导途径在CMP诱导巨噬细胞RAW264.7产生免疫应答时发挥了重要作用。展开更多
Rare earth-Mg-Ni-based superlattice structure alloys have garnered recognition as promising materials for hydrogen storage.However,their application is impeded by suboptimal cycling longevity.The novel AB_(4)-type all...Rare earth-Mg-Ni-based superlattice structure alloys have garnered recognition as promising materials for hydrogen storage.However,their application is impeded by suboptimal cycling longevity.The novel AB_(4)-type alloy emerges as an attractive candidate,distinguished by its good structure stability,high rate capability,and long-term durability.Herein,we designed an AB_(4)-type La_(0.6)0Sm_(0.22)Mg_(0.18)Ni_(4.09)Al_(0.09)Mn_(0.10)alloy that manifests superior electrochemical performance.The obtained AB_(4)-type single-phase alloy delivers a high discharge capacity of 375.2 mAh·g^(-1)and features outstanding discharge ability at high rates,maintaining 121 mAh·g^(-1)even at a discharge rate of 6C.The excellent high-rate discharge performance can be attributed to its fast charge transfer and hydrogen diffusion kinetics.Moreover,the AB_(4)-type alloy maintains a capacity retention of 84.5%after 200 cycles and retains 55.7%of its capacity retention even after 500 cycles.This work provides a good alternative to hydrogen storage alloy with high power and long cycling durability performance for nickel metal hydride batteries.展开更多
文摘目的研究羟苯磺酸钙在高糖诱导的环境下对Müller细胞氧化损伤的保护作用及其机制。方法通过高糖诱导建立Müller细胞氧化损伤模型,并将细胞分为4组,即对照组(正常培养)、高糖组(35mmol/L葡萄糖培养基)、对照+羟苯磺酸钙组(常规培养基础上加入0.5μmol/L羟苯磺酸钙)和高糖+羟苯磺酸钙组(高糖基础上加入0.5μmol/L羟苯磺酸钙)。使用CCK-8评估细胞增殖,流式细胞术检测细胞凋亡,试剂盒检测氧化应激指标,蛋白印迹技术检测内向整流钾离子通道4.1(inwardly rectifying K channel 4.1,Kir4.1)和水通道蛋白4(aquaporin-4,AQP4)蛋白水平。结果与对照组比较,高糖组Müller细胞增殖活性降低且凋亡率升高,细胞发生氧化应激,AQP4蛋白表达水平升高而Kir4.1蛋白表达水平降低(P<0.05)。与高糖组比较,高糖+羟苯磺酸钙组细胞增殖活性增加且凋亡率降低,细胞氧化应激损伤减轻,AQP4蛋白表达水平降低而Kir4.1蛋白表达水平升高(P<0.05)。结论羟苯磺酸钙可能通过调节AQP4/Kir4.1轴抑制高糖诱导的Müller细胞氧化损伤。
基金financial support from the“Lingyan”R&D Plan Project of Zhejiang Province(2025C02218)。
文摘The modulation of charge transfer pathways within type-I heterojunctions through interfacial electric field(IEF)engineering is of critical importance in promoting photocatalytic hydrogen evolution,effectively facilitating the separation of photogenerated charge carriers.In this study,we performed in-situ growth of two-dimensional ZnIn_(2)S_(4)nanosheets on MnCo_(2)O_(4.5)nanorods to construct an ohmic-like type-I ZnIn_(2)S_(4)/MnCo_(2)O_(4.5)heterojunction for efficient photocatalytic hydrogen evolution.This ohmic-like charge transfer mechanism effectively addresses the intrinsic limitations inherent to conventional type-I heterojunctions neglecting IEF effects,particularly through IEF-induced enhancement of charge separation efficiency.Consequently,the optimized ZnIn_(2)S_(4)/MnCo_(2)O_(4.5)photocatalyst demonstrates an outstanding photocatalytic hydrogen evolution rate of 20.9 mmol g^(−1)h^(−1),14.9 times that of the bare ZnIn_(2)S_(4).Furthermore,the ohmic-like charge transport behavior has been rigorously validated by integrated advanced experimental characterizations,including in-situ X-ray photoelectron spectroscopy(XPS),Kelvin probe force microscopy(KPFM),and surface photovoltage(SPV)measurements,which collectively provide robust evidence for the proposed mechanism.This work offers valuable insights into the design of high-efficient ohmic-like type-I heterojunction catalysts for photocatalytic H_(2)evolution.
基金supported by the Natural Science Foundation of China(Nos.52201282 and 52371239)the Natural Science Foundation of Hebei Province(No.E2024203037)+1 种基金the Basic Innovation Research Project in Yanshan University(2022LGZD004)Baotou Science and Technology Planning Project(No.XM2022BT09).
文摘Rare earth-Mg-Ni-based superlattice structure alloys have garnered recognition as promising materials for hydrogen storage.However,their application is impeded by suboptimal cycling longevity.The novel AB_(4)-type alloy emerges as an attractive candidate,distinguished by its good structure stability,high rate capability,and long-term durability.Herein,we designed an AB_(4)-type La_(0.6)0Sm_(0.22)Mg_(0.18)Ni_(4.09)Al_(0.09)Mn_(0.10)alloy that manifests superior electrochemical performance.The obtained AB_(4)-type single-phase alloy delivers a high discharge capacity of 375.2 mAh·g^(-1)and features outstanding discharge ability at high rates,maintaining 121 mAh·g^(-1)even at a discharge rate of 6C.The excellent high-rate discharge performance can be attributed to its fast charge transfer and hydrogen diffusion kinetics.Moreover,the AB_(4)-type alloy maintains a capacity retention of 84.5%after 200 cycles and retains 55.7%of its capacity retention even after 500 cycles.This work provides a good alternative to hydrogen storage alloy with high power and long cycling durability performance for nickel metal hydride batteries.
