The cytotoxic effect of cadmium is studied by detecting intracellular nicotinamide adenine dinucleotidea（NADH） autofluorescence in this work. NADH autofluorescence in processes of cadmium-induced apoptosis, necrosis...The cytotoxic effect of cadmium is studied by detecting intracellular nicotinamide adenine dinucleotidea（NADH） autofluorescence in this work. NADH autofluorescence in processes of cadmium-induced apoptosis, necrosis and reversible injury are recorded timely. The relativity between time course of NADH autofluorescence and cadmium toxicity is established. The cell toxicity effect of Cadmium on yeast cells is studied by detecting the time courses of intracellular reduced NADH autofluorescence in this work. The relativity between time courses of NADH autofluorescence and Cadmium toxicity is established.展开更多
Reduced nicotinamide adenine dinucleotide(NADH)plays a crucial role in many biochemical reactions in human metabolism.In this work,a flow-mediated skin fluorescence(FMSF)-postocclusion reactive hyperaemia(PORH)system ...Reduced nicotinamide adenine dinucleotide(NADH)plays a crucial role in many biochemical reactions in human metabolism.In this work,a flow-mediated skin fluorescence(FMSF)-postocclusion reactive hyperaemia(PORH)system was developed for noninvasive and in vivo measurement of NADH fluorescence and its real-time dynamical changes in human skin tissue.The real-time dynamical changes of NADH fluorescence were analyzed with the changes of skin blood flow measured by laser speckle contrast imaging(LSCI)experiments simultaneously with FMSFPORH measurements,which suggests that the dynamical changes of NADH fluorescence would be mainly correlated with the intrinsic changes of NADH level in the skin tissue.In addition,Monte Carlo simulations were applied to understand the impact of optical property changes on the dynamical changes of NADH fluorescence during the PORH process,which further supports that the dynamical changes of NADH fluorescence measured in our system would be intrinsic changes of NADH level in the skin tissue.展开更多
目的比较分析研究NADH(nicotinamide adenine dinucleotide)和HE(hematoxylin and eosin)染色评价射频治疗后即刻肝组织损伤。方法应用RF2000型射频治疗仪及LeVeen电极针,对5只实验猪肝脏进行射频消融,治疗后即刻取肝脏,分别行NADH和HE...目的比较分析研究NADH(nicotinamide adenine dinucleotide)和HE(hematoxylin and eosin)染色评价射频治疗后即刻肝组织损伤。方法应用RF2000型射频治疗仪及LeVeen电极针,对5只实验猪肝脏进行射频消融,治疗后即刻取肝脏,分别行NADH和HE染色,评价肝组织坏死程度。结果HE染色射频消融中央区表现为核浓缩、胞浆红染,而核碎裂、核消失少见,肝细胞索完整,其细胞核形态和排列较消融前无明显改变。周边带表现为肝窦充血、出血。消融中央区、周边出血带和正常区之间界限模糊,难以准确评价射频消融的组织坏死程度,而NADH染色见消融中央区肝细胞完全失去活力,周边充血出血带肝细胞尚有活力,与正常区呈色截然不同,境界清晰,可准确、快速地对射频消融的肝组织坏死程度作出判断。结论射频是一种有效的肝癌治疗方法,HE染色不能准确评价射频消融对肝组织的即刻灭活效应,酶组织化学NADH染色判定细胞活力简易、直观、准确。展开更多
Mitochondrial redox states provide important information about energy-linked biological processes and signaling events in tissues for various disease phenotypes including cancer.The redox scanning method developed at ...Mitochondrial redox states provide important information about energy-linked biological processes and signaling events in tissues for various disease phenotypes including cancer.The redox scanning method developed at the Chance laboratory about 30 years ago has allowed 3D highresolution(∼50×50×10µm^(3))imaging of mitochondrial redox state in tissue on the basis of the fluorescence of NADH(reduced nicotinamide adenine dinucleotide)and Fp(oxidized flavoproteins including flavin adenine dinucleotide,i.e.,FAD).In this review,we illustrate its basic principles,recent technical developments,and biomedical applications to cancer diagnostic and therapeutic studies in small animal models.Recently developed calibration procedures for the redox imaging using reference standards allow quantification of nominal NADH and Fp concentrations,and the concentration-based redox ratios,e.g.,Fp/(Fp+NADH)and NADH/(Fp+NADH)in tissues.This calibration facilitates the comparison of redox imaging results acquired for different metabolic states at different times and/or with different instrumental settings.A redox imager using a CCD detector has been developed to acquire 3D images faster and with a higher in-plane resolution down to 10µm.Ex vivo imaging and in vivo imaging of tissue mitochondrial redox status have been demonstrated with the CCD imager.Applications of tissue redox imaging in small animal cancer models include metabolic imaging of glioma and myc-induced mouse mammary tumors,predicting the metastatic potentials of human melanoma and breast cancer mouse xenografts,differentiating precancerous and normal tissues,and monitoring the tumor treatment response to photodynamic therapy.Possible future directions for the development of redox imaging are also discussed.展开更多
Most nanozyme research is limited to oxidase and peroxidase.Here,we reported the N,P,or S doped carbon nanotubes(CNTs)for enzyme mimics of nicotinamide adenine dinucleotide(NADH)oxidase and cytochrome c(Cyt c)reductas...Most nanozyme research is limited to oxidase and peroxidase.Here,we reported the N,P,or S doped carbon nanotubes(CNTs)for enzyme mimics of nicotinamide adenine dinucleotide(NADH)oxidase and cytochrome c(Cyt c)reductase.Through the doping of N element,the NADH oxidase-like activity of CNTs is highly improved,the maximum initial velocity for N doped CNT(N-CNT)is increased by 4.28 times compared to that before the modification.Through the analysis of NADH oxidation products,we found that biologically active NAD+was produced,the oxygen was selectively reduced to water or hydrogen peroxide,which is consistent with natural NADH oxidase.Furthermore,we found for the first time that carbon nanotubes can promote the transfer of electrons from NADH to Cyt c,thereby can mimic the properties of Cyt c reductase.展开更多
基金Supported by the National Natural Science Foundation of China (20275027)
文摘The cytotoxic effect of cadmium is studied by detecting intracellular nicotinamide adenine dinucleotidea（NADH） autofluorescence in this work. NADH autofluorescence in processes of cadmium-induced apoptosis, necrosis and reversible injury are recorded timely. The relativity between time course of NADH autofluorescence and cadmium toxicity is established. The cell toxicity effect of Cadmium on yeast cells is studied by detecting the time courses of intracellular reduced NADH autofluorescence in this work. The relativity between time courses of NADH autofluorescence and Cadmium toxicity is established.
基金supported by the Natural Science Foundation of Hubei Province(Grant No.2020CFB380)the Educational Commission of Hubei Province of China(Grant No.Q20191506).
文摘Reduced nicotinamide adenine dinucleotide(NADH)plays a crucial role in many biochemical reactions in human metabolism.In this work,a flow-mediated skin fluorescence(FMSF)-postocclusion reactive hyperaemia(PORH)system was developed for noninvasive and in vivo measurement of NADH fluorescence and its real-time dynamical changes in human skin tissue.The real-time dynamical changes of NADH fluorescence were analyzed with the changes of skin blood flow measured by laser speckle contrast imaging(LSCI)experiments simultaneously with FMSFPORH measurements,which suggests that the dynamical changes of NADH fluorescence would be mainly correlated with the intrinsic changes of NADH level in the skin tissue.In addition,Monte Carlo simulations were applied to understand the impact of optical property changes on the dynamical changes of NADH fluorescence during the PORH process,which further supports that the dynamical changes of NADH fluorescence measured in our system would be intrinsic changes of NADH level in the skin tissue.
文摘目的比较分析研究NADH(nicotinamide adenine dinucleotide)和HE(hematoxylin and eosin)染色评价射频治疗后即刻肝组织损伤。方法应用RF2000型射频治疗仪及LeVeen电极针,对5只实验猪肝脏进行射频消融,治疗后即刻取肝脏,分别行NADH和HE染色,评价肝组织坏死程度。结果HE染色射频消融中央区表现为核浓缩、胞浆红染,而核碎裂、核消失少见,肝细胞索完整,其细胞核形态和排列较消融前无明显改变。周边带表现为肝窦充血、出血。消融中央区、周边出血带和正常区之间界限模糊,难以准确评价射频消融的组织坏死程度,而NADH染色见消融中央区肝细胞完全失去活力,周边充血出血带肝细胞尚有活力,与正常区呈色截然不同,境界清晰,可准确、快速地对射频消融的肝组织坏死程度作出判断。结论射频是一种有效的肝癌治疗方法,HE染色不能准确评价射频消融对肝组织的即刻灭活效应,酶组织化学NADH染色判定细胞活力简易、直观、准确。
基金the Susan G.Komen Foundation Grant KG081069(PI:L.Z.Li)The Center for Magnietic Resonance and Optical Imaging,and an NIH supported research resource(P41-RR02305,PI:R.Reddy).
文摘Mitochondrial redox states provide important information about energy-linked biological processes and signaling events in tissues for various disease phenotypes including cancer.The redox scanning method developed at the Chance laboratory about 30 years ago has allowed 3D highresolution(∼50×50×10µm^(3))imaging of mitochondrial redox state in tissue on the basis of the fluorescence of NADH(reduced nicotinamide adenine dinucleotide)and Fp(oxidized flavoproteins including flavin adenine dinucleotide,i.e.,FAD).In this review,we illustrate its basic principles,recent technical developments,and biomedical applications to cancer diagnostic and therapeutic studies in small animal models.Recently developed calibration procedures for the redox imaging using reference standards allow quantification of nominal NADH and Fp concentrations,and the concentration-based redox ratios,e.g.,Fp/(Fp+NADH)and NADH/(Fp+NADH)in tissues.This calibration facilitates the comparison of redox imaging results acquired for different metabolic states at different times and/or with different instrumental settings.A redox imager using a CCD detector has been developed to acquire 3D images faster and with a higher in-plane resolution down to 10µm.Ex vivo imaging and in vivo imaging of tissue mitochondrial redox status have been demonstrated with the CCD imager.Applications of tissue redox imaging in small animal cancer models include metabolic imaging of glioma and myc-induced mouse mammary tumors,predicting the metastatic potentials of human melanoma and breast cancer mouse xenografts,differentiating precancerous and normal tissues,and monitoring the tumor treatment response to photodynamic therapy.Possible future directions for the development of redox imaging are also discussed.
基金the National Key Research and Development Program of China(No.2019YFA0709202)Natural Science Foundation of Jilin Province(No.20220101055JC)+1 种基金the International Cooperation Project of Jilin Scientific and Technological Development Program(No.20190701059GH)the National Natural Science Foundation of China(No.31301177).
文摘Most nanozyme research is limited to oxidase and peroxidase.Here,we reported the N,P,or S doped carbon nanotubes(CNTs)for enzyme mimics of nicotinamide adenine dinucleotide(NADH)oxidase and cytochrome c(Cyt c)reductase.Through the doping of N element,the NADH oxidase-like activity of CNTs is highly improved,the maximum initial velocity for N doped CNT(N-CNT)is increased by 4.28 times compared to that before the modification.Through the analysis of NADH oxidation products,we found that biologically active NAD+was produced,the oxygen was selectively reduced to water or hydrogen peroxide,which is consistent with natural NADH oxidase.Furthermore,we found for the first time that carbon nanotubes can promote the transfer of electrons from NADH to Cyt c,thereby can mimic the properties of Cyt c reductase.
