[Objective] The study aimed at investigating the influence of enhanced UV-B radiation on photosynthesis of grapevine.[Method] The seedlings of Cabernet sauvignon were treated with different intensities of UV-B radiati...[Objective] The study aimed at investigating the influence of enhanced UV-B radiation on photosynthesis of grapevine.[Method] The seedlings of Cabernet sauvignon were treated with different intensities of UV-B radiation under outdoor conditions,and then the contents of photosynthetic pigments and flavonoids in leaves were determined by measuring the absorbance of leaves extracts at 663,645,470 and 300 nm,respectively.[Result] The content of photosynthetic pigments in the leaves of grapevine obviously increased with time under the treatments of different enhanced UV-B radiation.Compared with the control,the chlorophyll a,chlorophyll b,total chlorophyll and carotenoid were obviously increased by 5%,2%,4% and 3% in the enhanced UV-B radiation treatment of 10.8 μW/cm2（T1）,and in the treatment of 25.6 μW/cm2（T2） the corresponding levels were subsequently increased by 11%,9%,10% and 7% with a significant increase in the content of chlorophyll a.On the other hand,the flavonoids content in the leaves of grapevine were obviously increased by 13%,9% in T1 and T2.[Conclusion] The grapevine has strong adaptability to UV-B radiation,and appropriate enhanced UV-B radiation couldn＇t decrease the photosynthesis of grapevine leaves.展开更多
[Objective] Effects of different concentrations of nitric oxide on membrane lipid peroxidation of wheat induced by enhanced UV-B radiation were researched,sodium nitroprusside （SNP） was selected as an exogenous nitr...[Objective] Effects of different concentrations of nitric oxide on membrane lipid peroxidation of wheat induced by enhanced UV-B radiation were researched,sodium nitroprusside （SNP） was selected as an exogenous nitric oxide（NO）donor.[Method] There are 3 groups including CK,UV treatment group （B）,B＋SNP treatment group,0,1,2,3,4 d sampling after treatment respectively,and physiological and biochemical indexes of MDA content and CAT,POD,SOD and so on were determined,repeated 3 times,and statistical analyzed.[Result] The results showed that,after the enhanced UV-B radiation,activity of the catalase （CAT）,superoxide dismutase （SOD） and of the guaiacol peroxidase （POD） all reduced apparently,and the concentration of malondialdehyde （MDA） increased obviously,leading to oxidative damage in wheat seedlings.Impose different concentrations of SNP after UV-B radiation,may mitigate oxidative damage of wheat seedling from different degrees,which was in agreement with the effect of making the concentration of MDA decrease and the activity of the CAT,SOD and POD all increased.The mitigation role of 0.01 mol/L SNP was more obvious for roots＇ oxidative damage,while 0.1 mmol/L SNP is more effective for oxidative damage of leaves.[Conclusion] Exogenous NO donor SNP had obvious relieve effects on oxidative damage of wheat seedlings caused by UV-B radiation,which can enhance adaptive capacity of plants to adversity stress.展开更多
Effect of cerium （Ce^3＋） on growth and photosynthesis in rape seedlings exposed to two levels of ultraviolet-B radiation （UV-B, 280 - 320 nm） was studied with hydroponics under laboratory conditions. The growth o...Effect of cerium （Ce^3＋） on growth and photosynthesis in rape seedlings exposed to two levels of ultraviolet-B radiation （UV-B, 280 - 320 nm） was studied with hydroponics under laboratory conditions. The growth of rape seedlings exposed to two levels of UV-B irradiation （0.15 and 0.35 W· m^-2/T2） was both heavily restrained. The aboveground growth indices including stem （plant） height, leaf number, leaf area, leaf fresh/dry weight and stem fresh/dry weight were obviously decreased by 13.2% - 44.1% （T1） and 21 .4% - 49.3% （T2）. Compared to CK, and except active absorption area of roots, the belowground indices main root length, root volume and fresh/dry weight by 14.1% -35.6% （T1） and 20.3% - 42.6% （T2）, respectively. For Ce ＋ UV-B treatments, the aboveground and belowground growth indices were decreased by 4.1% - 23.6%, 5.2% -23.3% （Ce＋T1） and 10.8% -28.4%, 7.0% -27.8% （Ce ＋T2）, lower than those of UV-B treatments mentioned above. These results show that Ce has protective effect on plant against injury of UV-B radiation. Furthermore, the protective effect of Ce on seedlings exposed to T1 level of UV-B radiation is superior to T2 level. Chlorophyll content, net photosynthesis rate, transpiration rate, stomatal conductance and water use efficiency in UV-B treatments decrease dramatically, whereas intercellular CO2 concentration increases. Although these indices in Ce ＋ UV-B treatments decrease compared with those of CK, the decrease in Ce ＋ UV-B treatments are lower than those in UV-B treatment. This phenomenon indicates that the ecophysiological protective effect of Ce is based on improving photosynthesis in plants. The dynamic curves of photosynthesis indices show that the course of light-repair is shortened and the injury to rape seedlings by UV-B radiation stress is alleviated by Ce.展开更多
In order to investigate the effects of lanthanum（Ⅲ） on cell ultrastructure of soybean leaves under elevated ultraviolet-B irradiation （UV-B, 280-320 nm）, the chloroplast ultrastructure of soybean seedlings was st...In order to investigate the effects of lanthanum（Ⅲ） on cell ultrastructure of soybean leaves under elevated ultraviolet-B irradiation （UV-B, 280-320 nm）, the chloroplast ultrastructure of soybean seedlings was studied by hydroponics under laboratory conditions. The resuits showed that the thylakoid in chloroplast was orderly and clearly as soybean leaves were pretreated by La（Ⅲ）. The thylakoid was indis- tinctly disordered, expanded and even indiscoverable in the chloroplast under UV-B stress. The impact on the thylakoid by the high intensity UV-B irradiation （T2） was bigger than that by the low intensity UV-B irradiation （T1）. However, the destruction of the chloroplast structure caused by UV-B stress was alleviated by La（Ⅲ）, and the arrangement of the thylakoid in the chloroplast became orderly and clearly. The effect of the alleviation by La（Ⅲ） under the low intensity UV-B irradiation （T1） was better than that under the high intensity UV-B irradiation （T2）.展开更多
The effect of La on flavonoids, chlorophyll contents, and phenylalanine ammonia-lyase （PAL） activity in soybean seedlings under supplementary ultraviolet-B radiation （UV-B, 280 - 320 nm） was studied. The results s...The effect of La on flavonoids, chlorophyll contents, and phenylalanine ammonia-lyase （PAL） activity in soybean seedlings under supplementary ultraviolet-B radiation （UV-B, 280 - 320 nm） was studied. The results show that PAL activity, contents of flavonoids and chlorophyll in the plants pretreated with La （20 mg·L^- 1 ） are higher than those in CK. UV-B radiation could result in an increase in flavonoid content and PAL activity, associated with a decrease in chlorophyll content. However, the increase in the range of PAL activity and flavonoid content in UV-B treatment are lesser than those in the La treatment. The changes of flavonoid contents and PAL activity in La ＋ UV-B treatment are similar to those in UV-B treatment, and the increase in their range is higher than those in UV-B treatment. This shows that La can enhance the resistance of soybean seedling to UV-B radiation and alleviate the damage of UV-B radiation by increasing flavonoid content, chlorophyll content, and PAL activity.展开更多
In order to investigate the possible role of silicon in rice(Oryza sativa L.)leaves resistance to ultraviolet-B(UV-B).experiments were conducted by using rice plants solution-cultured with or without silicon supplemen...In order to investigate the possible role of silicon in rice(Oryza sativa L.)leaves resistance to ultraviolet-B(UV-B).experiments were conducted by using rice plants solution-cultured with or without silicon supplementation.Results showed that under high UV-B irradiation the silicon-deficient leaves exhibited obvious brown spots and strips of UV damage symptoms,but the silicon-treated leaves were not affected.A 21%and 67%increase in soluble and insoluble UV-absorbing compounds was observed in the epidermis of silicon-treated leaves,respectively.Furthermore,fluorescence microscopy revealed that a great deal of insoluble UV-absorbing compounds was enriched in silicon bodies that were formed in the cell walls and cell lumina of epidermis of silicon-treated leaves,whereas the insoluble UV-absorbing compounds were less in the epidermis of non-silicon-treated leaves.Based on these results,it is concluded that the elevated UV resistance of silicon-treated leaves is due to the increase of phenolic compounds in epidermis induced by silicon.展开更多
AIM:To explore the DNA methylation of COL4A1 in ultraviolet-B(UVB)-induced age-related cataract(ARC)models in vitro and in vivo.METHODS:Human lens epithelium B3(HLEB3)cells and Sprague Dawley rats were exposure to UVB...AIM:To explore the DNA methylation of COL4A1 in ultraviolet-B(UVB)-induced age-related cataract(ARC)models in vitro and in vivo.METHODS:Human lens epithelium B3(HLEB3)cells and Sprague Dawley rats were exposure to UVB respectively.The MTT assay was utilized to evaluate cell proliferation.Flow cytometry was employed for analysis of cell apoptosis and cell cycle.COL4A1 expression in HLEB3 cells and anterior lens capsules were assessed using Western blot and reverse transcription-polymerase chain reaction(RTPCR).The localization of COL4A1 in HLEB3 cells was determined by immunofluorescence.The methylation status of CpG islands located in COL4A1 promoter was verified using bisulfite-sequencing PCR(BSP).DNMTs and TETs mRNA levels was examined by RT-PCR.RESULTS:UVB exposure decreased HLEB3 cells proliferation,while increased the apoptosis rate and cells were arrested in G0/G1 phase.COL4A1 expression was markedly inhibited in UVB treated cells compared to the controls.Hypermethylation status was detected in the CpG islands within COL4A1 promoter in HLEB3 cells subjected to UVB exposure.Expressions of DNMTs including DNMT1/2/3 were elevated in UVB treated HLEB3 cells compared to that in the controls,while expressions of TETs including TET1/2/3 showed the opposite trend.Results from the UVB treated rat model further confirmed the decreased expression of COL4A1,hypermethylation status of the CpG islands at promoter of COL4A1 and abnormal expression of DNMT1/2/3 and TET1/2/in UVB exposure group.CONCLUSION:DNA hypermethylation of COL4A1 promoter CpG islands is correlated with decreased COL4A1 expression in UVB induced HLEB3 cells and anterior lens capsules of rats.展开更多
Wheat (Triticum aestivum), as a kind of important economic crop cultured in the Northern China, is affected by present-day enhanced ultraviolet-B (UV-B) radiation. To get the information of the impact by UV-B radiatio...Wheat (Triticum aestivum), as a kind of important economic crop cultured in the Northern China, is affected by present-day enhanced ultraviolet-B (UV-B) radiation. To get the information of the impact by UV-B radiation on it, the proteins of wheat (Jin mai NO.8) leaves, which were divided into the normal light group (CK) and UV-B radiation group (B), were extracted and ran at SDS-PAGE at different treatment days (5, 6, 7). The proteins were also analyzed by run two-dimensional gel electrophoresis (2-DE), which allowed the identification of some significantly different gel spots. The proteins spots were further verified by Matrix-Assisted Laser Desorption/lonization-time of Flight Mass Spectrometry. The results showed: 1) the enhanced UV-B affects the growth of the wheat, as the visual changes appear on the sixth day;2) the proteins expressions between the B group and the CK group were remarkably different on the sixth day;3) the proteins of wheat leaves of the sixth day were further analyzed by 2-DE revealed that twenty-one protein points were identificated between the B group and the CK group. Among these twenty-one proteins, six proteins of them were up-regulated and twelve proteins of them were down-regulated, three new proteins were expressed only in the B group. Three proteins among six proteins, which were up-regulated, were further verified as RuBisCo large subunit binding protein;SOD;Calmodulin. The result indicates wheat could improve genes encoding proteins in their leaves and protect themselves, when enhanced UV-B affects the growth of the wheat.展开更多
The aim of this research was to explore the effects and signaling pathway of ultraviolet-B(UVB)irradiation on the expression of hypoxia-inducible factor 1a(HIF-1α)and transferrin receptor(TfR).HIF-1α protein was mea...The aim of this research was to explore the effects and signaling pathway of ultraviolet-B(UVB)irradiation on the expression of hypoxia-inducible factor 1a(HIF-1α)and transferrin receptor(TfR).HIF-1α protein was measured by Western blot method.Expressions of epidermal growth factor receptor(EGFR),phosphor-EGF-R and TfR after UVB irradiation were determined with flow cytometry.After UVB irradiation,mRNA levels of HIF-1α and TfR were detected by real time-PCR.Results showed that compared with control groups,UVB was able to induce HIF1α and TfR protein expression in a dose-and time-dependent manner in HaCat cells(P<0.05).TfR mRNA was expressed in a dose-dependent manner and reached a peak at the 8th hour in HaCat cells(P<0.05)whereas HIF-1α mRNA expression was not affected by UVB treatment(P>0.05).The EGFR/PI3K/AKT signaling pathway was required for the induction of HIF-1α and TfR expression induced by UVB.UVB induced activation of EGFR in HaCat cells and EGFR regulated expression of TfR and HIF-1α.EGFR(−/−)MEF did not increase the HIF1 expression following UVB irradiation(P>0.05).In contrast,EGFR(+/+)MEF strongly enhanced HIF1a expression after UVB irradiation(P<0.05).PD153035,a selective inhibitor of EGFR tyrosine kinase,inhibited the TfR protein expression in UVB-treated cells in a dose-dependent manner(P<0.05).PI3K inhibitors,LY294002 and wortmannin,inhibited HIF-1a and TfR expressions induced by UVB(P<0.05).The DEC1(−/−)Ha-Cat cells did not increase their TfR and HIF-1α expressions following UVB irradiation(P>0.05).In contrast,DEC1(+/+)HaCat cells strongly enhanced TfR and HIF-1α protein expression after UVB irradiation(P<0.05).We conclude that UVB induces TfR and HIF-1α expressions via EGFR/PI3K/AKT/DEC1 signaling pathway.展开更多
目的:探讨窄谱中波紫外线(narrow-band ultraviolet B,NB-UVB)通过促进维生素D(vitamin D,VD)代谢缓解咪喹莫特(imiquimod,IMQ)诱导银屑病样小鼠皮炎的效应机制。方法:C57BL/6小鼠背部去毛外涂IMQ乳膏进行银屑病样皮炎的造模,检测小鼠...目的:探讨窄谱中波紫外线(narrow-band ultraviolet B,NB-UVB)通过促进维生素D(vitamin D,VD)代谢缓解咪喹莫特(imiquimod,IMQ)诱导银屑病样小鼠皮炎的效应机制。方法:C57BL/6小鼠背部去毛外涂IMQ乳膏进行银屑病样皮炎的造模,检测小鼠血清中VD代谢产物25(OH)D_(3)和1,25(OH)_(2)D_(3)的含量,以及皮损中VD受体(vitamin D receptor,VDR)mRNA表达;确定NB-UVB照射小鼠的辐照能量后,进行造模联合NB-UVB照射,观察小鼠皮损,检测血清中25(OH)D_(3)和1,25(OH)_(2)D_(3)的含量、皮损中VDR和炎症因子[白细胞介素(interleukin,IL)-17A、IL-23、肿瘤坏死因子(tumor necrosis factor,TNF)-α、IL-1β]的mRNA表达及蛋白含量及CD_(3)^(+)CD4^(+)IL-17A^(+)T细胞比例。使用特异性抑制剂Dafadine-A阻断小鼠VD代谢关键酶细胞色素P450家族27亚家族A成员1(cytochrome P450 family 27 subfamily A member 1,CYP27A1)活性后,再进行造模和NB-UVB照射,观察皮损,检测皮损中CD_(3)^(+)CD4^(+)IL-17A^(+)T细胞比例、炎症因子表达情况、VDR mRNA表达情况和血清中25(OH)D_(3)、1,25(OH)_(2)D_(3)的含量。结果:银屑病样小鼠模型血清中25(OH)D_(3)、1,25(OH)_(2)D_(3)含量和皮损中VDR的mRNA表达均显著降低。NB-UVB照射银屑病样小鼠模型后,相比模型组,小鼠血清中25(OH)D_(3)、1,25(OH)_(2)D_(3)含量和皮损中VDR的mRNA表达上调,皮损中炎症因子IL-17A、IL-23、TNF-α、IL-1β的表达及含量均下调、CD_(3)^(+)CD4^(+)IL-17A^(+)T细胞比例也显著下降。使用Dafadine-A预处理小鼠后进行造模联合NB-UVB照射,相比IMQ联合NB-UVB照射组,血清中25(OH)D_(3)、1,25(OH)_(2)D_(3)含量和皮损中VDR的mRNA表达均显著降低,皮损中CD_(3)^(+)CD4^(+)IL-17A^(+)T细胞比例和炎症因子IL-17A、IL-23、TNF-α、IL-1β的含量均显著升高。结论:NB-UVB照射通过促进VD代谢缓解银屑病样小鼠皮肤炎症。特异性阻断VD代谢关键酶CYP27A1活性后,NB-UVB照射缓解银屑病样小鼠皮损及炎症反应的效应显著减弱。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
文摘[Objective] The study aimed at investigating the influence of enhanced UV-B radiation on photosynthesis of grapevine.[Method] The seedlings of Cabernet sauvignon were treated with different intensities of UV-B radiation under outdoor conditions,and then the contents of photosynthetic pigments and flavonoids in leaves were determined by measuring the absorbance of leaves extracts at 663,645,470 and 300 nm,respectively.[Result] The content of photosynthetic pigments in the leaves of grapevine obviously increased with time under the treatments of different enhanced UV-B radiation.Compared with the control,the chlorophyll a,chlorophyll b,total chlorophyll and carotenoid were obviously increased by 5%,2%,4% and 3% in the enhanced UV-B radiation treatment of 10.8 μW/cm2（T1）,and in the treatment of 25.6 μW/cm2（T2） the corresponding levels were subsequently increased by 11%,9%,10% and 7% with a significant increase in the content of chlorophyll a.On the other hand,the flavonoids content in the leaves of grapevine were obviously increased by 13%,9% in T1 and T2.[Conclusion] The grapevine has strong adaptability to UV-B radiation,and appropriate enhanced UV-B radiation couldn＇t decrease the photosynthesis of grapevine leaves.
基金Supported by National Natural Science Foundation of China(No.30671061)Natural Science Foundation of Shanxi Province(No.2008011059-1 and No.20041101)~~
文摘[Objective] Effects of different concentrations of nitric oxide on membrane lipid peroxidation of wheat induced by enhanced UV-B radiation were researched,sodium nitroprusside （SNP） was selected as an exogenous nitric oxide（NO）donor.[Method] There are 3 groups including CK,UV treatment group （B）,B＋SNP treatment group,0,1,2,3,4 d sampling after treatment respectively,and physiological and biochemical indexes of MDA content and CAT,POD,SOD and so on were determined,repeated 3 times,and statistical analyzed.[Result] The results showed that,after the enhanced UV-B radiation,activity of the catalase （CAT）,superoxide dismutase （SOD） and of the guaiacol peroxidase （POD） all reduced apparently,and the concentration of malondialdehyde （MDA） increased obviously,leading to oxidative damage in wheat seedlings.Impose different concentrations of SNP after UV-B radiation,may mitigate oxidative damage of wheat seedling from different degrees,which was in agreement with the effect of making the concentration of MDA decrease and the activity of the CAT,SOD and POD all increased.The mitigation role of 0.01 mol/L SNP was more obvious for roots＇ oxidative damage,while 0.1 mmol/L SNP is more effective for oxidative damage of leaves.[Conclusion] Exogenous NO donor SNP had obvious relieve effects on oxidative damage of wheat seedlings caused by UV-B radiation,which can enhance adaptive capacity of plants to adversity stress.
文摘Effect of cerium （Ce^3＋） on growth and photosynthesis in rape seedlings exposed to two levels of ultraviolet-B radiation （UV-B, 280 - 320 nm） was studied with hydroponics under laboratory conditions. The growth of rape seedlings exposed to two levels of UV-B irradiation （0.15 and 0.35 W· m^-2/T2） was both heavily restrained. The aboveground growth indices including stem （plant） height, leaf number, leaf area, leaf fresh/dry weight and stem fresh/dry weight were obviously decreased by 13.2% - 44.1% （T1） and 21 .4% - 49.3% （T2）. Compared to CK, and except active absorption area of roots, the belowground indices main root length, root volume and fresh/dry weight by 14.1% -35.6% （T1） and 20.3% - 42.6% （T2）, respectively. For Ce ＋ UV-B treatments, the aboveground and belowground growth indices were decreased by 4.1% - 23.6%, 5.2% -23.3% （Ce＋T1） and 10.8% -28.4%, 7.0% -27.8% （Ce ＋T2）, lower than those of UV-B treatments mentioned above. These results show that Ce has protective effect on plant against injury of UV-B radiation. Furthermore, the protective effect of Ce on seedlings exposed to T1 level of UV-B radiation is superior to T2 level. Chlorophyll content, net photosynthesis rate, transpiration rate, stomatal conductance and water use efficiency in UV-B treatments decrease dramatically, whereas intercellular CO2 concentration increases. Although these indices in Ce ＋ UV-B treatments decrease compared with those of CK, the decrease in Ce ＋ UV-B treatments are lower than those in UV-B treatment. This phenomenon indicates that the ecophysiological protective effect of Ce is based on improving photosynthesis in plants. The dynamic curves of photosynthesis indices show that the course of light-repair is shortened and the injury to rape seedlings by UV-B radiation stress is alleviated by Ce.
基金supported by the National Natural Science Foundation of China (30570323)the Special Foundation for Rare Earth of State Planning Committee (IFZ20051210)
文摘In order to investigate the effects of lanthanum（Ⅲ） on cell ultrastructure of soybean leaves under elevated ultraviolet-B irradiation （UV-B, 280-320 nm）, the chloroplast ultrastructure of soybean seedlings was studied by hydroponics under laboratory conditions. The resuits showed that the thylakoid in chloroplast was orderly and clearly as soybean leaves were pretreated by La（Ⅲ）. The thylakoid was indis- tinctly disordered, expanded and even indiscoverable in the chloroplast under UV-B stress. The impact on the thylakoid by the high intensity UV-B irradiation （T2） was bigger than that by the low intensity UV-B irradiation （T1）. However, the destruction of the chloroplast structure caused by UV-B stress was alleviated by La（Ⅲ）, and the arrangement of the thylakoid in the chloroplast became orderly and clearly. The effect of the alleviation by La（Ⅲ） under the low intensity UV-B irradiation （T1） was better than that under the high intensity UV-B irradiation （T2）.
基金Project supported by the National Natural Science Foundation of China (20471030)the Foundation of State PlanningCommittee (IFZ20051210)
文摘The effect of La on flavonoids, chlorophyll contents, and phenylalanine ammonia-lyase （PAL） activity in soybean seedlings under supplementary ultraviolet-B radiation （UV-B, 280 - 320 nm） was studied. The results show that PAL activity, contents of flavonoids and chlorophyll in the plants pretreated with La （20 mg·L^- 1 ） are higher than those in CK. UV-B radiation could result in an increase in flavonoid content and PAL activity, associated with a decrease in chlorophyll content. However, the increase in the range of PAL activity and flavonoid content in UV-B treatment are lesser than those in the La treatment. The changes of flavonoid contents and PAL activity in La ＋ UV-B treatment are similar to those in UV-B treatment, and the increase in their range is higher than those in UV-B treatment. This shows that La can enhance the resistance of soybean seedling to UV-B radiation and alleviate the damage of UV-B radiation by increasing flavonoid content, chlorophyll content, and PAL activity.
文摘In order to investigate the possible role of silicon in rice(Oryza sativa L.)leaves resistance to ultraviolet-B(UV-B).experiments were conducted by using rice plants solution-cultured with or without silicon supplementation.Results showed that under high UV-B irradiation the silicon-deficient leaves exhibited obvious brown spots and strips of UV damage symptoms,but the silicon-treated leaves were not affected.A 21%and 67%increase in soluble and insoluble UV-absorbing compounds was observed in the epidermis of silicon-treated leaves,respectively.Furthermore,fluorescence microscopy revealed that a great deal of insoluble UV-absorbing compounds was enriched in silicon bodies that were formed in the cell walls and cell lumina of epidermis of silicon-treated leaves,whereas the insoluble UV-absorbing compounds were less in the epidermis of non-silicon-treated leaves.Based on these results,it is concluded that the elevated UV resistance of silicon-treated leaves is due to the increase of phenolic compounds in epidermis induced by silicon.
基金Supported by the Shaanxi Provincial Department of Science and Technology Agency Project(No.2022SF-502)Xi’an Medical University Scientific Research Capacity Improvement Project(No.2022NLTS104)+2 种基金The Fifth Batch of Key Disciplines of Xi’an Medical University(No.medical technology12202306)Yunzhen Optometry Special Fund(No.2021HXZR10)Innovation and Entrepreneurship Training Program for College Students(No.S202211840043).
文摘AIM:To explore the DNA methylation of COL4A1 in ultraviolet-B(UVB)-induced age-related cataract(ARC)models in vitro and in vivo.METHODS:Human lens epithelium B3(HLEB3)cells and Sprague Dawley rats were exposure to UVB respectively.The MTT assay was utilized to evaluate cell proliferation.Flow cytometry was employed for analysis of cell apoptosis and cell cycle.COL4A1 expression in HLEB3 cells and anterior lens capsules were assessed using Western blot and reverse transcription-polymerase chain reaction(RTPCR).The localization of COL4A1 in HLEB3 cells was determined by immunofluorescence.The methylation status of CpG islands located in COL4A1 promoter was verified using bisulfite-sequencing PCR(BSP).DNMTs and TETs mRNA levels was examined by RT-PCR.RESULTS:UVB exposure decreased HLEB3 cells proliferation,while increased the apoptosis rate and cells were arrested in G0/G1 phase.COL4A1 expression was markedly inhibited in UVB treated cells compared to the controls.Hypermethylation status was detected in the CpG islands within COL4A1 promoter in HLEB3 cells subjected to UVB exposure.Expressions of DNMTs including DNMT1/2/3 were elevated in UVB treated HLEB3 cells compared to that in the controls,while expressions of TETs including TET1/2/3 showed the opposite trend.Results from the UVB treated rat model further confirmed the decreased expression of COL4A1,hypermethylation status of the CpG islands at promoter of COL4A1 and abnormal expression of DNMT1/2/3 and TET1/2/in UVB exposure group.CONCLUSION:DNA hypermethylation of COL4A1 promoter CpG islands is correlated with decreased COL4A1 expression in UVB induced HLEB3 cells and anterior lens capsules of rats.
文摘Wheat (Triticum aestivum), as a kind of important economic crop cultured in the Northern China, is affected by present-day enhanced ultraviolet-B (UV-B) radiation. To get the information of the impact by UV-B radiation on it, the proteins of wheat (Jin mai NO.8) leaves, which were divided into the normal light group (CK) and UV-B radiation group (B), were extracted and ran at SDS-PAGE at different treatment days (5, 6, 7). The proteins were also analyzed by run two-dimensional gel electrophoresis (2-DE), which allowed the identification of some significantly different gel spots. The proteins spots were further verified by Matrix-Assisted Laser Desorption/lonization-time of Flight Mass Spectrometry. The results showed: 1) the enhanced UV-B affects the growth of the wheat, as the visual changes appear on the sixth day;2) the proteins expressions between the B group and the CK group were remarkably different on the sixth day;3) the proteins of wheat leaves of the sixth day were further analyzed by 2-DE revealed that twenty-one protein points were identificated between the B group and the CK group. Among these twenty-one proteins, six proteins of them were up-regulated and twelve proteins of them were down-regulated, three new proteins were expressed only in the B group. Three proteins among six proteins, which were up-regulated, were further verified as RuBisCo large subunit binding protein;SOD;Calmodulin. The result indicates wheat could improve genes encoding proteins in their leaves and protect themselves, when enhanced UV-B affects the growth of the wheat.
基金This research was supported in part by a grant from the National Natural Science Foundation of China(Grant No.30271195)a grant from NIH(P20 RR016457 from the BRIN Program of the National Center for Research Resources)+1 种基金a grant for biomedical research from Rhode Island Foundation,a grant from the Committee on Aid to Faculty Research from Providence Collegea grant from Slater Center for Environmental Biotechnology.
文摘The aim of this research was to explore the effects and signaling pathway of ultraviolet-B(UVB)irradiation on the expression of hypoxia-inducible factor 1a(HIF-1α)and transferrin receptor(TfR).HIF-1α protein was measured by Western blot method.Expressions of epidermal growth factor receptor(EGFR),phosphor-EGF-R and TfR after UVB irradiation were determined with flow cytometry.After UVB irradiation,mRNA levels of HIF-1α and TfR were detected by real time-PCR.Results showed that compared with control groups,UVB was able to induce HIF1α and TfR protein expression in a dose-and time-dependent manner in HaCat cells(P<0.05).TfR mRNA was expressed in a dose-dependent manner and reached a peak at the 8th hour in HaCat cells(P<0.05)whereas HIF-1α mRNA expression was not affected by UVB treatment(P>0.05).The EGFR/PI3K/AKT signaling pathway was required for the induction of HIF-1α and TfR expression induced by UVB.UVB induced activation of EGFR in HaCat cells and EGFR regulated expression of TfR and HIF-1α.EGFR(−/−)MEF did not increase the HIF1 expression following UVB irradiation(P>0.05).In contrast,EGFR(+/+)MEF strongly enhanced HIF1a expression after UVB irradiation(P<0.05).PD153035,a selective inhibitor of EGFR tyrosine kinase,inhibited the TfR protein expression in UVB-treated cells in a dose-dependent manner(P<0.05).PI3K inhibitors,LY294002 and wortmannin,inhibited HIF-1a and TfR expressions induced by UVB(P<0.05).The DEC1(−/−)Ha-Cat cells did not increase their TfR and HIF-1α expressions following UVB irradiation(P>0.05).In contrast,DEC1(+/+)HaCat cells strongly enhanced TfR and HIF-1α protein expression after UVB irradiation(P<0.05).We conclude that UVB induces TfR and HIF-1α expressions via EGFR/PI3K/AKT/DEC1 signaling pathway.
文摘目的:探讨窄谱中波紫外线(narrow-band ultraviolet B,NB-UVB)通过促进维生素D(vitamin D,VD)代谢缓解咪喹莫特(imiquimod,IMQ)诱导银屑病样小鼠皮炎的效应机制。方法:C57BL/6小鼠背部去毛外涂IMQ乳膏进行银屑病样皮炎的造模,检测小鼠血清中VD代谢产物25(OH)D_(3)和1,25(OH)_(2)D_(3)的含量,以及皮损中VD受体(vitamin D receptor,VDR)mRNA表达;确定NB-UVB照射小鼠的辐照能量后,进行造模联合NB-UVB照射,观察小鼠皮损,检测血清中25(OH)D_(3)和1,25(OH)_(2)D_(3)的含量、皮损中VDR和炎症因子[白细胞介素(interleukin,IL)-17A、IL-23、肿瘤坏死因子(tumor necrosis factor,TNF)-α、IL-1β]的mRNA表达及蛋白含量及CD_(3)^(+)CD4^(+)IL-17A^(+)T细胞比例。使用特异性抑制剂Dafadine-A阻断小鼠VD代谢关键酶细胞色素P450家族27亚家族A成员1(cytochrome P450 family 27 subfamily A member 1,CYP27A1)活性后,再进行造模和NB-UVB照射,观察皮损,检测皮损中CD_(3)^(+)CD4^(+)IL-17A^(+)T细胞比例、炎症因子表达情况、VDR mRNA表达情况和血清中25(OH)D_(3)、1,25(OH)_(2)D_(3)的含量。结果:银屑病样小鼠模型血清中25(OH)D_(3)、1,25(OH)_(2)D_(3)含量和皮损中VDR的mRNA表达均显著降低。NB-UVB照射银屑病样小鼠模型后,相比模型组,小鼠血清中25(OH)D_(3)、1,25(OH)_(2)D_(3)含量和皮损中VDR的mRNA表达上调,皮损中炎症因子IL-17A、IL-23、TNF-α、IL-1β的表达及含量均下调、CD_(3)^(+)CD4^(+)IL-17A^(+)T细胞比例也显著下降。使用Dafadine-A预处理小鼠后进行造模联合NB-UVB照射,相比IMQ联合NB-UVB照射组,血清中25(OH)D_(3)、1,25(OH)_(2)D_(3)含量和皮损中VDR的mRNA表达均显著降低,皮损中CD_(3)^(+)CD4^(+)IL-17A^(+)T细胞比例和炎症因子IL-17A、IL-23、TNF-α、IL-1β的含量均显著升高。结论:NB-UVB照射通过促进VD代谢缓解银屑病样小鼠皮肤炎症。特异性阻断VD代谢关键酶CYP27A1活性后,NB-UVB照射缓解银屑病样小鼠皮损及炎症反应的效应显著减弱。
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。
