Potentilla sericea is a heavy metal hyperaccumulator landscaping plant.MYB transcription factors play an important role in regulating plant stress response to adversity.However,there are few studies on MYB transcripti...Potentilla sericea is a heavy metal hyperaccumulator landscaping plant.MYB transcription factors play an important role in regulating plant stress response to adversity.However,there are few studies on MYB transcription factors in stress tolerance in Potentilla sericea.In this study,the PsMYB62 gene was successfully cloned from Potentilla sericea.Methods:Bioinformatic analysis and real-time quantitative PCR(qPCR)methods were used to evaluate this gene.The transgenic A.thaliana were obtained by flower dipping and the gene function was identified by determining physiological indicators under cadmium stress.Results:The open reading frame of PsMYB62 is 942 bp,which encodes 313 amino acids(aa)and belongs to the R2R3 MYB transcription factor.The plant overexpression vector PBI121-PsMYB62-GFP was constructed and successfully transferred into A.thaliana.The relative expression level of PsMYB62 was significantly increased by CdCl_(2),NaCl,ABA,and mannitol treatments.The germination rate of transgenic seeds was higher than those of wild type(WT)and empty vector(EV)under different concentrations of cadmium treatment.Upon treatment with 100μmol·L^(−1)of CdCl_(2)·2.5H_(2)O,the activities of superoxide dismutase(SOD),peroxidase(POD),and catalase(CAT)in the transgenic plants were significantly higher than those in the WT and EV.The contents of H_(2)O_(2),O_(2)·−and malondialdehyde(MDA)in transgenic lines were increased,but lower than those in WT and EV.The expression levels of AtGSH,AtPCS,and AtNAS4 that were related to the regulation of cadmium were increased,but the expression levels of transgenic lines were higher than those of WT and EV.Conclusion:The above results showed that PsMYB62 could be induced by cadmium and could improve the cadmium resistance of plants.展开更多
研究了十二烷基苯磺酸钠（SDBS）、十六烷基三甲基溴化铵（CTAB）、聚乙二醇辛基苯基醚（TritonX-100）等不同离子类型的表面活性剂对水稻土中重金属的解吸效果,并采用盆栽实验研究了上述3种表面活性剂对Zn超富集植物长柔毛委陵菜（Pote...研究了十二烷基苯磺酸钠（SDBS）、十六烷基三甲基溴化铵（CTAB）、聚乙二醇辛基苯基醚（TritonX-100）等不同离子类型的表面活性剂对水稻土中重金属的解吸效果,并采用盆栽实验研究了上述3种表面活性剂对Zn超富集植物长柔毛委陵菜（Potentilla griffithii var. velutina）的生物量、吸收和富集重金属的影响。结果表明：CTAB对水稻土中Zn、Pb、Cd和Cu的解吸效果好于SDBS和TritonX-100,而且3种表面活性剂对各重金属的解吸率大小都为Cd〉Zn〉Cu〉Pb。3种表面活性剂促进长柔毛委陵菜叶、柄和根的生物量增加了0.2-2.5倍,并且长柔毛委陵菜各部位的生物量大小为叶〉柄〉根。3种表面活性剂都增加了长柔毛委陵菜各部位对Zn、Cd吸收及其叶和柄对Pb、Cu的吸收,同时显著促进Zn、Pb、Cd和Cu从植物根部向地上部转运,从而增加了Zn、Pb、Cd和Cu在长柔毛委陵菜地上部的提取量和分布以及长柔毛委陵菜对Zn、Pb、Cd和Cu的富集能力;因此3种表面活性剂都提高了长柔毛委陵菜修复重金属污染土壤的效率。展开更多
Potentilla anserina L.and Elymus nutans Griseb.are dominant species in the subalpine meadows of China.Grazing is one of the most important factors that influence community structure and productivity of subalpine meado...Potentilla anserina L.and Elymus nutans Griseb.are dominant species in the subalpine meadows of China.Grazing is one of the most important factors that influence community structure and productivity of subalpine meadows.Understanding how grazing changes photosynthetic capability is essential for preservation and restoration of grasslands.However,information about the effects of grazing on photosynthetic capability remains inadequate.Experiments were conducted in fencing and grazing areas in the Qilian Mountains,Northwest China.The leaf gas exchange and photosynthetic curves of P.anserina and E.nutans were measured at different growth stages.Results showed that grazing decreased the values of leaf gas exchange parameters,such as net photosynthetic rate,stomatal conductance,transpiration rate,and intercellular CO2 concentration of P.anserina and E.nutans.In addition,grazing decreased the values of net photosynthetic rate-photosynthetically active radiation(PN-PAR)curve parameters,such as light-saturated net photosynthetic rate,apparent quantum efficiency,light compensation point,light saturation point,and dark respiration rate.Our results demonstrated that grazing was the primary limiting factor for photosynthesis of dominant grassland species in the study area.展开更多
The non-rectangular hyperbola(NRH)equation is the most popular method that plots the photosynthetic light-response(PLR)curve and helps to identify plant photosynthetic capability.However,the PLR curve can't be plo...The non-rectangular hyperbola(NRH)equation is the most popular method that plots the photosynthetic light-response(PLR)curve and helps to identify plant photosynthetic capability.However,the PLR curve can't be plotted well by the NRH equation at different plant growth phases due to the variations of plant development.Recently,plant physiological parameters have been considered into the NRH equation to establish the modified NRH equation,but plant height(H),an important parameter in plant growth phases,is not taken into account.In this study,H was incorporated into the NRH equation to establish the modified NRH equation,which could be used to estimate photosynthetic capability of herbage at different growth phases.To explore photosynthetic capability of herbage,we selected the dominant herbage species Potentilla anserina L.and Elymus nutans Griseb.in the Heihe River Basin,Northwest China as the research materials.Totally,twenty-four PLR curves and H at different growth phases were measured during the growing season in 2016.Results showed that the maximum net photosynthetic rate and the initial slope of PLR curve linearly increased with H.The modified NRH equation,which is established by introducing H and an H-based adjustment factor into the NRH equation,described better the PLR curves of P.anserina and E.nutans than the original ones.The results may provide an effective method to estimate the net primary productivity of grasslands in the study area.展开更多
Herbal medicinal products have a long-standing therapeutic record. To ensure the quality of herbal products specific identification tests which allow experts to discriminate related species and/or potential adulterant...Herbal medicinal products have a long-standing therapeutic record. To ensure the quality of herbal products specific identification tests which allow experts to discriminate related species and/or potential adulterants/substitutes are required. The purpose of the research was to recommend an original and simple method for the separation of closely related five triterpenic acids (ursolic, oleanolic, tormentic, euscaphic, pomolic acid) and its application to chemotaxonomy studies. 17 standard samples of Potentilla species and 3 test samples were chromatographed (with or without prechromatographic derivatization) on silica gel plates using the mobile phase: chloroform-diethyl ether-methanol-formic acid (30:10:1:0.2 v/v/v/v);they were subsequently derivatized, and visualized in UV 366 nm light. After images received pre-treatment (montaging stack, removal of noise, background subtract, horizontal equalization, two types of warping) exploratory analysis of the investigated Potentilla species fingerprints was processed. The method without prechromatographic derivatization was used to create differential fingerprints. Good results were obtained by the application of r-project iterative algorithm for subtract background and our simple algorithm for warping to image processing of TLC chromatograms for the first time.展开更多
[Objectives]To study the effects of Fruticosa potentilla L.on the expression of key enzymes and hormones related to glucose and lipid metabolism in T2DM rats.[Methods]The ethyl acetate fraction of 95%methanol extract ...[Objectives]To study the effects of Fruticosa potentilla L.on the expression of key enzymes and hormones related to glucose and lipid metabolism in T2DM rats.[Methods]The ethyl acetate fraction of 95%methanol extract of F.potentilla(MEE)was administered orally to the T2DM rats,and the level of glucose and expression of insulin,resistin,leptin,glucokinase(GK)and glucose-6-phosphatase(G-6-Pase)in the rats were measured and detected.[Results]In the T2DM rats administered with MEE,the postprandial blood glucose level decreased,the expression levels of resistin,leptin and G-6-Pase were down-regulated,and the expression levels of insulin and GK were up-regulated(P<0.05,P<0.01).[Conclusions]F.potentilla can reduce effectively postprandial blood glucose level,regulate the expression of a variety of enzymes and hormones related to glucose and lipid metabolism and recover partially the insulin level in T2DM rats to achieve resistance to T2DM.展开更多
The alcohol and n-butanol extract of Potentilla anserine L. significantly protects myocardium from acute ischemic injury. However, its effects on rat hippocampal neurons and the mechanism of protection remain unclear....The alcohol and n-butanol extract of Potentilla anserine L. significantly protects myocardium from acute ischemic injury. However, its effects on rat hippocampal neurons and the mechanism of protection remain unclear. In this study, primary cultured hippocampal neurons from neonatal rats were incubated in 95% N2 and 5% CO2 for 4 hours. Results indicated that hypoxic injury decreased the viability of neurons, increased the expression levels of caspase-9 and caspase-3 mRNA, as well as cytochrome c, Caspase-9, and Caspase-3 protein. Pretreatment with 0.25, 0.062 5, 0.015 6 mg/mL n-butanol extract of Potentilla anserine L. led to a significant increase in cell viability. Expression levels of caspase-9 and caspase-3 mRNA, as well as cytochrome c, Caspase-9, and Caspase-3 protein, were attenuated. The neuroprotective effect of n-butanol extract of Potentilla anserine L. was equivalent to tanshinone IIA. Our data suggest that the n-butanol extract of Potentilla anserine L. could protect primary hippocampal neurons from hypoxic injury by deactivating mitochondrial cell death.展开更多
A new taraxastane-20β, 28β-epoxy-28-hydroxy-3β,11α-diol-11-p-hydroxylbenzoate was isolated from the roots of Potentilla multicaulis. Its structure was elucidated by spectroscopic methods, especially 2D NMR techniq...A new taraxastane-20β, 28β-epoxy-28-hydroxy-3β,11α-diol-11-p-hydroxylbenzoate was isolated from the roots of Potentilla multicaulis. Its structure was elucidated by spectroscopic methods, especially 2D NMR techniques.展开更多
Oxidative stress plays a crucial role in cadmium(Cd)-induced myocardial injury.Mitsugumin 53(MG53)and its mediated reperfusion injury salvage kinase(RISK)pathway have been demonstrated to be closely related to myocard...Oxidative stress plays a crucial role in cadmium(Cd)-induced myocardial injury.Mitsugumin 53(MG53)and its mediated reperfusion injury salvage kinase(RISK)pathway have been demonstrated to be closely related to myocardial oxidative damage.Potentilla anserina L.polysaccharide(PAP)is a polysaccharide with antioxidant capacity,which exerts protective effect on Cd-induced damage.However,it remains unknown whether PAP can prevent and treat Cd-induced cardiomyocyte damages.The present study was desgined to explore the effect of PAP on Cd-induced damage in H9c2 cells based on MG53 and the mediated RISK pathway.For in vitro evaluation,cell viability and apoptosis rate were analyzed by CCK-8 assay and flow cytometry,respectively.Furthermore,oxidative stress was assessed by 2',7'-dichlorodihydrofluorescein diacetate(DCFH-DA)staining and using superoxide dismutase(SOD),catalase(CAT),and glutathione/oxidized glutathione(GSH/GSSG)kits.The mitochondrial function was measured by JC-10 staining and ATP detection assay.Western blot was performed to detect the expression of proteins related to MG53,the RISK pathway,and apoptosis.The results indicated that Cd increased the levels of reactive oxygen species(ROS)in H9c2 cells.Cd decreased the activities of SOD and CAT and the ratio of GSH/GSSG,resulting in decreases in cell viability and increases in apoptosis.Interestingly,PAP reversed Cd-induced oxidative stress and cell apoptosis.Meanwhile,Cd reduced the expression of MG53 in H9c2 clls and inhibited the RISK pathway,which was mediated by decreasing the ratio of p-Akt^(Ser473)/Akt,p-GSK3β^(Ser9)/GSK3β and p ERK1/2/ERK1/2.In addition,Cd impaired mitochondrial function,which involved a reduction in ATP content and mitochondrial membrane potential(MMP),and an increase in the ratio of Bax/Bcl-2,cytoplasmic cytochrome c/mitochondrial cytochrome c,and Cleaved-Caspase 3/Pro-Caspase 3.Importantly,PAP alleviated Cd-induced MG53 reduction,activated the RISK pathway,and reduced mitochondrial damage.Interestingly,knockdown of MG53 or inhibition of the RISK pathway attenuated the protective effect of PAP in Cd-induced H9c2 cells.In sum,PAP reduces Cd-induced damage in H9c2 cells,which is mediated by increasing MG53 expression and activating the RISK pathway.展开更多
The study by the eddy covariance technique in the alpine shrub meadow of the Qing-hai-Tibet Plateau in 2003 and 2004 showed that the net ecosystem carbon dioxide exchange (NEE) exhibited noticeable diurnal and annual ...The study by the eddy covariance technique in the alpine shrub meadow of the Qing-hai-Tibet Plateau in 2003 and 2004 showed that the net ecosystem carbon dioxide exchange (NEE) exhibited noticeable diurnal and annual variations, with more distinct daily changes during the warmer seasons. The CO2 emission of the shrub ecosystem culminated in April and September while the CO2 absorption capacity reached a maximum in July and August. The absorbed carbon dioxide during the two consecutive years was 231.4 and 274.8 g CO2·m-2 respectively, yielding an average of 253.1 gCO2·m-2 per year: that accounts for a large proportion of absorbed CO2 in the region. Obviously, the diurnal carbon flux was negatively related to temperature, radiation and other atmospheric factors. Still, minute discrepancies in kurtosis and duration of carbon emission/absorption were detected between 2003 and 2004. It was found that the CO2 flux in the daytime was similarly affected by photosynthetic photon flux density in both years. Temperature appears to be the most important determinant of CO2 flux: specifically, the high temperature during the plant growing season inhibits the carbon absorption capacity. One potential explanation is that soil respiration is enhanced under such condition. Analysis of biomass revealed that the annual net carbon fixed capacity of aboveground and belowground biomass was 544.0 in 2003 and 559.4 g Cm"2 in 2004, which coincided with the NEE absorption capacity (63.1 g C·m-2 in 2003 and 74.9 g C·m-2 in 2004) in the corresponding plant growing season.展开更多
Objective To investigate the protective effect of n-butanol extract from the roots of Potentilla anserina (NP) on hypoxic hippocampal neurons in neonatal rats. Methods Primary cultured hippocampal neurons were pretrea...Objective To investigate the protective effect of n-butanol extract from the roots of Potentilla anserina (NP) on hypoxic hippocampal neurons in neonatal rats. Methods Primary cultured hippocampal neurons were pretreated with different concentration of NP (0.25, 0.0625, and 0.0156 mg/mL) before incubation in a low oxygen (0.1%) environment for 4 h. Cell viability was evaluated by Trypan blue staining assay. Lactate dehydrogenase (LDH) released by neurons into the medium was measured. The activity of superoxide dismutase (SOD) in cell cytosol was determined using nitroblue tetrazolium. Morphological changes and mitochondrial function were observed by transmission electron microscopy. Results Hypoxic injury could decrease the cells viability of neuron, enhance LDH release (P < 0.05), decrease SOD activity, and increase mitochondrial injury. Pretreatment with NP significantly increased cell viability, decreased LDH release (P < 0.05), promoted SOD activity (P < 0.05), and remarkably improved cellular ultra-microstructure compared with the model group. Conclusion NP could protect the primary hippocampal neurons from hypoxic injury by attenuating mitochondrial cell death.展开更多
基金funded by the Natural Science Foundation of Heilongjiang Province(LH2020C045).
文摘Potentilla sericea is a heavy metal hyperaccumulator landscaping plant.MYB transcription factors play an important role in regulating plant stress response to adversity.However,there are few studies on MYB transcription factors in stress tolerance in Potentilla sericea.In this study,the PsMYB62 gene was successfully cloned from Potentilla sericea.Methods:Bioinformatic analysis and real-time quantitative PCR(qPCR)methods were used to evaluate this gene.The transgenic A.thaliana were obtained by flower dipping and the gene function was identified by determining physiological indicators under cadmium stress.Results:The open reading frame of PsMYB62 is 942 bp,which encodes 313 amino acids(aa)and belongs to the R2R3 MYB transcription factor.The plant overexpression vector PBI121-PsMYB62-GFP was constructed and successfully transferred into A.thaliana.The relative expression level of PsMYB62 was significantly increased by CdCl_(2),NaCl,ABA,and mannitol treatments.The germination rate of transgenic seeds was higher than those of wild type(WT)and empty vector(EV)under different concentrations of cadmium treatment.Upon treatment with 100μmol·L^(−1)of CdCl_(2)·2.5H_(2)O,the activities of superoxide dismutase(SOD),peroxidase(POD),and catalase(CAT)in the transgenic plants were significantly higher than those in the WT and EV.The contents of H_(2)O_(2),O_(2)·−and malondialdehyde(MDA)in transgenic lines were increased,but lower than those in WT and EV.The expression levels of AtGSH,AtPCS,and AtNAS4 that were related to the regulation of cadmium were increased,but the expression levels of transgenic lines were higher than those of WT and EV.Conclusion:The above results showed that PsMYB62 could be induced by cadmium and could improve the cadmium resistance of plants.
文摘研究了十二烷基苯磺酸钠（SDBS）、十六烷基三甲基溴化铵（CTAB）、聚乙二醇辛基苯基醚（TritonX-100）等不同离子类型的表面活性剂对水稻土中重金属的解吸效果,并采用盆栽实验研究了上述3种表面活性剂对Zn超富集植物长柔毛委陵菜（Potentilla griffithii var. velutina）的生物量、吸收和富集重金属的影响。结果表明：CTAB对水稻土中Zn、Pb、Cd和Cu的解吸效果好于SDBS和TritonX-100,而且3种表面活性剂对各重金属的解吸率大小都为Cd〉Zn〉Cu〉Pb。3种表面活性剂促进长柔毛委陵菜叶、柄和根的生物量增加了0.2-2.5倍,并且长柔毛委陵菜各部位的生物量大小为叶〉柄〉根。3种表面活性剂都增加了长柔毛委陵菜各部位对Zn、Cd吸收及其叶和柄对Pb、Cu的吸收,同时显著促进Zn、Pb、Cd和Cu从植物根部向地上部转运,从而增加了Zn、Pb、Cd和Cu在长柔毛委陵菜地上部的提取量和分布以及长柔毛委陵菜对Zn、Pb、Cd和Cu的富集能力;因此3种表面活性剂都提高了长柔毛委陵菜修复重金属污染土壤的效率。
基金financially supported by the National Natural Science Foundation of China(91025015,51178209)the Project of Arid Meteorological Science Research Foundation of China Meteorological Administration(IAM201608)
文摘Potentilla anserina L.and Elymus nutans Griseb.are dominant species in the subalpine meadows of China.Grazing is one of the most important factors that influence community structure and productivity of subalpine meadows.Understanding how grazing changes photosynthetic capability is essential for preservation and restoration of grasslands.However,information about the effects of grazing on photosynthetic capability remains inadequate.Experiments were conducted in fencing and grazing areas in the Qilian Mountains,Northwest China.The leaf gas exchange and photosynthetic curves of P.anserina and E.nutans were measured at different growth stages.Results showed that grazing decreased the values of leaf gas exchange parameters,such as net photosynthetic rate,stomatal conductance,transpiration rate,and intercellular CO2 concentration of P.anserina and E.nutans.In addition,grazing decreased the values of net photosynthetic rate-photosynthetically active radiation(PN-PAR)curve parameters,such as light-saturated net photosynthetic rate,apparent quantum efficiency,light compensation point,light saturation point,and dark respiration rate.Our results demonstrated that grazing was the primary limiting factor for photosynthesis of dominant grassland species in the study area.
基金funded by the National Natural Science Foundation of China(91025015,51178209)the Project of Arid Meteorological Science Research Foundation of China Meteorological Administration(IAM201608)
文摘The non-rectangular hyperbola(NRH)equation is the most popular method that plots the photosynthetic light-response(PLR)curve and helps to identify plant photosynthetic capability.However,the PLR curve can't be plotted well by the NRH equation at different plant growth phases due to the variations of plant development.Recently,plant physiological parameters have been considered into the NRH equation to establish the modified NRH equation,but plant height(H),an important parameter in plant growth phases,is not taken into account.In this study,H was incorporated into the NRH equation to establish the modified NRH equation,which could be used to estimate photosynthetic capability of herbage at different growth phases.To explore photosynthetic capability of herbage,we selected the dominant herbage species Potentilla anserina L.and Elymus nutans Griseb.in the Heihe River Basin,Northwest China as the research materials.Totally,twenty-four PLR curves and H at different growth phases were measured during the growing season in 2016.Results showed that the maximum net photosynthetic rate and the initial slope of PLR curve linearly increased with H.The modified NRH equation,which is established by introducing H and an H-based adjustment factor into the NRH equation,described better the PLR curves of P.anserina and E.nutans than the original ones.The results may provide an effective method to estimate the net primary productivity of grasslands in the study area.
文摘Herbal medicinal products have a long-standing therapeutic record. To ensure the quality of herbal products specific identification tests which allow experts to discriminate related species and/or potential adulterants/substitutes are required. The purpose of the research was to recommend an original and simple method for the separation of closely related five triterpenic acids (ursolic, oleanolic, tormentic, euscaphic, pomolic acid) and its application to chemotaxonomy studies. 17 standard samples of Potentilla species and 3 test samples were chromatographed (with or without prechromatographic derivatization) on silica gel plates using the mobile phase: chloroform-diethyl ether-methanol-formic acid (30:10:1:0.2 v/v/v/v);they were subsequently derivatized, and visualized in UV 366 nm light. After images received pre-treatment (montaging stack, removal of noise, background subtract, horizontal equalization, two types of warping) exploratory analysis of the investigated Potentilla species fingerprints was processed. The method without prechromatographic derivatization was used to create differential fingerprints. Good results were obtained by the application of r-project iterative algorithm for subtract background and our simple algorithm for warping to image processing of TLC chromatograms for the first time.
基金Supported by National Natural Science Foundation of China(No.81460652)Key Research and Development and Achievements Transformation Program of Qinghai Province(No.2018-SF-144)Project Funded by Key Laboratory of Medicinal Animal and Plant Resources of Qinghai-Tibet Plateau in Qinghai Province(No.2017-z-y25)
文摘[Objectives]To study the effects of Fruticosa potentilla L.on the expression of key enzymes and hormones related to glucose and lipid metabolism in T2DM rats.[Methods]The ethyl acetate fraction of 95%methanol extract of F.potentilla(MEE)was administered orally to the T2DM rats,and the level of glucose and expression of insulin,resistin,leptin,glucokinase(GK)and glucose-6-phosphatase(G-6-Pase)in the rats were measured and detected.[Results]In the T2DM rats administered with MEE,the postprandial blood glucose level decreased,the expression levels of resistin,leptin and G-6-Pase were down-regulated,and the expression levels of insulin and GK were up-regulated(P<0.05,P<0.01).[Conclusions]F.potentilla can reduce effectively postprandial blood glucose level,regulate the expression of a variety of enzymes and hormones related to glucose and lipid metabolism and recover partially the insulin level in T2DM rats to achieve resistance to T2DM.
基金supported by the National Natural Science Foundation of China, No. 30672774 and No. 81073152the Great Program of Science Foundation of Tianjin, No.10JCZDJC21100
文摘The alcohol and n-butanol extract of Potentilla anserine L. significantly protects myocardium from acute ischemic injury. However, its effects on rat hippocampal neurons and the mechanism of protection remain unclear. In this study, primary cultured hippocampal neurons from neonatal rats were incubated in 95% N2 and 5% CO2 for 4 hours. Results indicated that hypoxic injury decreased the viability of neurons, increased the expression levels of caspase-9 and caspase-3 mRNA, as well as cytochrome c, Caspase-9, and Caspase-3 protein. Pretreatment with 0.25, 0.062 5, 0.015 6 mg/mL n-butanol extract of Potentilla anserine L. led to a significant increase in cell viability. Expression levels of caspase-9 and caspase-3 mRNA, as well as cytochrome c, Caspase-9, and Caspase-3 protein, were attenuated. The neuroprotective effect of n-butanol extract of Potentilla anserine L. was equivalent to tanshinone IIA. Our data suggest that the n-butanol extract of Potentilla anserine L. could protect primary hippocampal neurons from hypoxic injury by deactivating mitochondrial cell death.
文摘A new taraxastane-20β, 28β-epoxy-28-hydroxy-3β,11α-diol-11-p-hydroxylbenzoate was isolated from the roots of Potentilla multicaulis. Its structure was elucidated by spectroscopic methods, especially 2D NMR techniques.
基金supported by the Open Fund of Key Laboratory of Dunhuang Medicine,Ministry of Education(No.DHYX20-09)the Youth Research Foundation of Gansu University of Chinese Medicine(No.ZQ2017-14)+1 种基金the Natural Science Foundation of Gansu Province of China(No.20JR10RA600)the Young Doctors Fund Project of Colleges and Universities in Gansu Provine(No.2022QB-133)。
文摘Oxidative stress plays a crucial role in cadmium(Cd)-induced myocardial injury.Mitsugumin 53(MG53)and its mediated reperfusion injury salvage kinase(RISK)pathway have been demonstrated to be closely related to myocardial oxidative damage.Potentilla anserina L.polysaccharide(PAP)is a polysaccharide with antioxidant capacity,which exerts protective effect on Cd-induced damage.However,it remains unknown whether PAP can prevent and treat Cd-induced cardiomyocyte damages.The present study was desgined to explore the effect of PAP on Cd-induced damage in H9c2 cells based on MG53 and the mediated RISK pathway.For in vitro evaluation,cell viability and apoptosis rate were analyzed by CCK-8 assay and flow cytometry,respectively.Furthermore,oxidative stress was assessed by 2',7'-dichlorodihydrofluorescein diacetate(DCFH-DA)staining and using superoxide dismutase(SOD),catalase(CAT),and glutathione/oxidized glutathione(GSH/GSSG)kits.The mitochondrial function was measured by JC-10 staining and ATP detection assay.Western blot was performed to detect the expression of proteins related to MG53,the RISK pathway,and apoptosis.The results indicated that Cd increased the levels of reactive oxygen species(ROS)in H9c2 cells.Cd decreased the activities of SOD and CAT and the ratio of GSH/GSSG,resulting in decreases in cell viability and increases in apoptosis.Interestingly,PAP reversed Cd-induced oxidative stress and cell apoptosis.Meanwhile,Cd reduced the expression of MG53 in H9c2 clls and inhibited the RISK pathway,which was mediated by decreasing the ratio of p-Akt^(Ser473)/Akt,p-GSK3β^(Ser9)/GSK3β and p ERK1/2/ERK1/2.In addition,Cd impaired mitochondrial function,which involved a reduction in ATP content and mitochondrial membrane potential(MMP),and an increase in the ratio of Bax/Bcl-2,cytoplasmic cytochrome c/mitochondrial cytochrome c,and Cleaved-Caspase 3/Pro-Caspase 3.Importantly,PAP alleviated Cd-induced MG53 reduction,activated the RISK pathway,and reduced mitochondrial damage.Interestingly,knockdown of MG53 or inhibition of the RISK pathway attenuated the protective effect of PAP in Cd-induced H9c2 cells.In sum,PAP reduces Cd-induced damage in H9c2 cells,which is mediated by increasing MG53 expression and activating the RISK pathway.
基金This work was mainly supported by the Knowledge Innovation Program of the Chinese Acad-emy of Sciences (Grant No. KZCX1-SW-01-01A) the State Key Basic Research Plan of China (Grant No.2002CB412 501).
文摘The study by the eddy covariance technique in the alpine shrub meadow of the Qing-hai-Tibet Plateau in 2003 and 2004 showed that the net ecosystem carbon dioxide exchange (NEE) exhibited noticeable diurnal and annual variations, with more distinct daily changes during the warmer seasons. The CO2 emission of the shrub ecosystem culminated in April and September while the CO2 absorption capacity reached a maximum in July and August. The absorbed carbon dioxide during the two consecutive years was 231.4 and 274.8 g CO2·m-2 respectively, yielding an average of 253.1 gCO2·m-2 per year: that accounts for a large proportion of absorbed CO2 in the region. Obviously, the diurnal carbon flux was negatively related to temperature, radiation and other atmospheric factors. Still, minute discrepancies in kurtosis and duration of carbon emission/absorption were detected between 2003 and 2004. It was found that the CO2 flux in the daytime was similarly affected by photosynthetic photon flux density in both years. Temperature appears to be the most important determinant of CO2 flux: specifically, the high temperature during the plant growing season inhibits the carbon absorption capacity. One potential explanation is that soil respiration is enhanced under such condition. Analysis of biomass revealed that the annual net carbon fixed capacity of aboveground and belowground biomass was 544.0 in 2003 and 559.4 g Cm"2 in 2004, which coincided with the NEE absorption capacity (63.1 g C·m-2 in 2003 and 74.9 g C·m-2 in 2004) in the corresponding plant growing season.
基金Natural Science Foundation of China (30672774 81073152)the Great Program of Science Foundation of Tianjin (10JCZDJC21100)
文摘Objective To investigate the protective effect of n-butanol extract from the roots of Potentilla anserina (NP) on hypoxic hippocampal neurons in neonatal rats. Methods Primary cultured hippocampal neurons were pretreated with different concentration of NP (0.25, 0.0625, and 0.0156 mg/mL) before incubation in a low oxygen (0.1%) environment for 4 h. Cell viability was evaluated by Trypan blue staining assay. Lactate dehydrogenase (LDH) released by neurons into the medium was measured. The activity of superoxide dismutase (SOD) in cell cytosol was determined using nitroblue tetrazolium. Morphological changes and mitochondrial function were observed by transmission electron microscopy. Results Hypoxic injury could decrease the cells viability of neuron, enhance LDH release (P < 0.05), decrease SOD activity, and increase mitochondrial injury. Pretreatment with NP significantly increased cell viability, decreased LDH release (P < 0.05), promoted SOD activity (P < 0.05), and remarkably improved cellular ultra-microstructure compared with the model group. Conclusion NP could protect the primary hippocampal neurons from hypoxic injury by attenuating mitochondrial cell death.
