Cu-Mn co-doped CeO_(2) photocatalyst was successfully synthesized by the sol-gel method to assess its capability in degrading tetracycline.XRD and TEM results showed that Cu and Mn were successfully co-doped into CeO_...Cu-Mn co-doped CeO_(2) photocatalyst was successfully synthesized by the sol-gel method to assess its capability in degrading tetracycline.XRD and TEM results showed that Cu and Mn were successfully co-doped into CeO_(2) without forming heterostructure,XPS and photoelectrochemical results revealed that Mn ions doping amplified the generation of photo-induced charge carriers,while Cu ions doping significantly facilitated the interfacial charge transfer process.Notably,the optimized Cu3Mn2CeO_(2) nanoparticles exhibited the highest TC removal efficiency,achieved a rate of 78.18%and maintained a stable cycling performance.展开更多
目的探讨山茱萸提取物(Cornus officinalis extract,COE)对紫外线B(ultraviolet-B,UVB)辐射引起的皮肤损伤的修复作用,并探讨其潜在的作用机制。方法通过检测人角化细胞(human keratinocytes cells,Ha Ca T)中UVB诱导的基质金属蛋白酶(m...目的探讨山茱萸提取物(Cornus officinalis extract,COE)对紫外线B(ultraviolet-B,UVB)辐射引起的皮肤损伤的修复作用,并探讨其潜在的作用机制。方法通过检测人角化细胞(human keratinocytes cells,Ha Ca T)中UVB诱导的基质金属蛋白酶(matrix metalloproteinases,MMPs)及促炎细胞因子的表达,评估COE的光保护作用,并对其抗氧化酶活性及胶原蛋白含量进行评价。小鼠无毛皮肤在UVB辐射下暴露后,局部应用提取物,并测定表皮厚度、皮肤含水量及胶原mRNA的表达量。结果在UVB照射(354.128 m J/cm^(2))下,1.00mg/m L COE显著增强了抗氧化酶活性,显著降低了促炎细胞因子前列腺素E2、白细胞介素1α、白细胞介素6的表达;同时降低了MMPs的表达;胶原蛋白含量显著增加,Ⅰ型胶原和Ⅲ型胶原蛋白的表达量分别增加13%和75%。此外,COE能够减轻UVB辐射引起的小鼠皮肤表皮增厚及胶原蛋白的丧失。同时,COE处理使丙二醛(malondialdehyde,MDA)含量降低69%,超氧化物歧化酶(superoxide dismutase,SOD)、谷胱甘肽过氧化物酶(clutathione peroxidase,GSH-Px)活性分别升高27%和234%。对小鼠表皮m RNA表达的分析表明,用COE处理导致Mmp1a和Mmp3 mRNA表达水平降低,Col1a1和Col3a1 m RNA水平升高。结论COE能够有效改善UVB辐射引起的皮肤损伤,其作用机制可能与抗氧化酶活性的增强以及促炎细胞因子和MMPs表达的抑制密切相关。本研究旨在通过小鼠和细胞模型进一步探究山茱萸对UVB诱导的皮肤损伤的光保护潜力并阐明其潜在机制,为治疗由UVB光老化导致皮肤疾病的研究和山茱萸新药开发提供理论依据。展开更多
基金Funded by the Scientific Research Fund of Wuhan Institute of Technology(No.K2023055)the Key Research and Development Project of Hubei Province(No.2020BCA075)the Shccig-Qinling Program(No.2022QL-XM-ZhuLi-HG-006)。
文摘Cu-Mn co-doped CeO_(2) photocatalyst was successfully synthesized by the sol-gel method to assess its capability in degrading tetracycline.XRD and TEM results showed that Cu and Mn were successfully co-doped into CeO_(2) without forming heterostructure,XPS and photoelectrochemical results revealed that Mn ions doping amplified the generation of photo-induced charge carriers,while Cu ions doping significantly facilitated the interfacial charge transfer process.Notably,the optimized Cu3Mn2CeO_(2) nanoparticles exhibited the highest TC removal efficiency,achieved a rate of 78.18%and maintained a stable cycling performance.
文摘目的探讨山茱萸提取物(Cornus officinalis extract,COE)对紫外线B(ultraviolet-B,UVB)辐射引起的皮肤损伤的修复作用,并探讨其潜在的作用机制。方法通过检测人角化细胞(human keratinocytes cells,Ha Ca T)中UVB诱导的基质金属蛋白酶(matrix metalloproteinases,MMPs)及促炎细胞因子的表达,评估COE的光保护作用,并对其抗氧化酶活性及胶原蛋白含量进行评价。小鼠无毛皮肤在UVB辐射下暴露后,局部应用提取物,并测定表皮厚度、皮肤含水量及胶原mRNA的表达量。结果在UVB照射(354.128 m J/cm^(2))下,1.00mg/m L COE显著增强了抗氧化酶活性,显著降低了促炎细胞因子前列腺素E2、白细胞介素1α、白细胞介素6的表达;同时降低了MMPs的表达;胶原蛋白含量显著增加,Ⅰ型胶原和Ⅲ型胶原蛋白的表达量分别增加13%和75%。此外,COE能够减轻UVB辐射引起的小鼠皮肤表皮增厚及胶原蛋白的丧失。同时,COE处理使丙二醛(malondialdehyde,MDA)含量降低69%,超氧化物歧化酶(superoxide dismutase,SOD)、谷胱甘肽过氧化物酶(clutathione peroxidase,GSH-Px)活性分别升高27%和234%。对小鼠表皮m RNA表达的分析表明,用COE处理导致Mmp1a和Mmp3 mRNA表达水平降低,Col1a1和Col3a1 m RNA水平升高。结论COE能够有效改善UVB辐射引起的皮肤损伤,其作用机制可能与抗氧化酶活性的增强以及促炎细胞因子和MMPs表达的抑制密切相关。本研究旨在通过小鼠和细胞模型进一步探究山茱萸对UVB诱导的皮肤损伤的光保护潜力并阐明其潜在机制,为治疗由UVB光老化导致皮肤疾病的研究和山茱萸新药开发提供理论依据。
