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自由基清除剂对延缓青花菜花蕾衰老的效应 总被引：20，自引：2，他引：18
青花菜采后花蕾迅速衰老，叶绿素和蛋白质含量明显下降，超氧物歧化酶（ＳＯＤ）和过氧化氢酶（ＣＡＴ）活性随衰老进程先升高而后下降，丙二醛（ＭＤＡ）持续增加，细胞膜透性迅速增大。２０ｍｇ／Ｌ６－苄基腺嘌呤（６－ＢＡ）处理明显延缓叶绿素和蛋白质的降解，提高ＳＯＤ活性，对ＣＡＴ激活尤为明显，抑制了Ｈａｂｅｒ－Ｗｅｉｓｓ反应，降低过氧化氢（Ｈ２Ｏ２）和羟基自由基（ＯＨ）含量，延缓膜脂过氧化作用，降低子ＭＤＡ含量，减小膜渗漏，延缓花蕾衰老。２０ｍｇ／Ｌ６－ＢＡ中加入０２％苯甲酸钠（ＳＢＮ），对６－ＢＡ产生的各种延衰效应均有增效作用，进一步推迟花蕾衰老。２００ｍｇ／Ｌ抗坏血酸（ＡｓＡ）促进叶绿素和蛋白质降解，在提高ＳＯＤ和ＣＡＴ活性的同时，ＭＤＡ反而明显增加，膜透性迅速增大，加速衰老。 相似文献
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水杨酸对苹果叶片中过氧化氢水平的调节及其机制 总被引：46，自引：3，他引：43
以两年生‘王林’苹果为试材，研究了水杨酸（ＳＡ）对苹果叶片中过氧化氢（Ｈ２Ｏ２）水平的调节及其机制。结果表明，０．２５～１０．０ｍｍｏｌ·Ｌ－１ＳＡ能明显提高叶片中Ｈ２Ｏ２水平，其机制不仅在于ＳＡ抑制了过氧化氢酶（ＣＡＴ）活性，从而抑制了Ｈ２Ｏ２的降解使其积累，而且还由于ＳＡ提高了超氧化物歧化酶（ＳＯＤ）活性，促进了超氧阴离子（Ｏ－２）向Ｈ２Ｏ２的歧化反应，因而增加了Ｈ２Ｏ２的生成量。ＳＡ还诱导了特异的过氧化物酶（ＰＯＤ）同工酶，这可能也与Ｈ２Ｏ２的积累有关 相似文献
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营养物质对早熟桃幼胚离体培养成苗的影响 总被引：4，自引：0，他引：4
本文研究了培养基中干营养物质对早熟桃幼胚成苗的影响。结果发现：桃胚发育 指数ＰＦＬ值（胚长／种子长）愈小，对所需培养基中铵态氮浓度愈高，蔗糖浓度愈大。 但培养基加氨基酸化合物后，对幼胚成苗有抑制作用，仅仅可以提高ＰＦＬ值０．２幼胚的 成苗率。结果表明：ＫＮＯ３１９００毫克／升（以下单位同）、ＮＨ４ＮＯ３８５０、ＭｇＳＯ４．７Ｈ２Ｏ １８５、ＫＨ２ＰＯ４８５、 ＣａＣｌ２·２Ｈ２Ｏ２２０、 ＭＳ培养基的微量元素和有机化合物、蔗 糖 ６％，Ｇｌｎ６８０、ＬＨ５００、Ａｄ４０、ＢＡ２．０、１ＡＡ０．２５，ＮＡＡ０．２５、Ａ．Ｃ．０．０２％、琼 脂０．６％组合的培养基适合于ＰＦＬ值０．２幼胚成苗，成苗率达９３．８％。要使ＰＦＬ值０．３ ～０．４幼胚成苗达９０％以上，尚要对培养基中大量元素做进一步调整。 相似文献
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以不同基因型材料的西瓜品种为试材，用ＭＳ、Ｍｉｌｌｅｒ、Ｎ６与不同激素配比的培养基，初步建立了西瓜离体组培再生体系。结果表明，不同浓度的ＭＳ培养基均可长出无菌苗，但随着ＭＳ培养基营养元素浓度的增大，无菌苗生长发育受到延迟和抑制作用加强，其中以 １／２ ＭＳ＋ ０．５～２ ｍｇ／Ｌ ＢＡ＋ ０． ｍｇ／Ｌ ＮＡＡ长出的无菌苗作外植体诱导愈伤组织最快，改良的 ＭＳ（ＭＳＩ＋ ２ ｍｇ／Ｌ ＢＡ＋０．１ｍｇ／ＬＮＡＡ）是西瓜愈伤组织诱导的最适培养基，改良的ＭＳ（ＭＳＩ＋２ｍｇ／ＬＢＡ＋０．１ｍｇ／ＬＮＡＡ＋５ ｍｇ／ＬＡｇＮＯ３）是外植体诱导分化不定芽的最适培养基，离子束等物理因子处理愈伤组织发现对诱导分化不定芽具有刺激和促进作用。 相似文献
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猕猴桃的组织培养和快速繁殖 总被引：4，自引：0，他引：4
１ 植物名称 金魁猕猴桃（Ａｃｔｉｎｉｄｉａ ｄｅｌｉｃｉｏｓａｖａｒ．Ｊｉｎ Ｋｕｉ）２ 材料类别 嫩茎３ 培养条件 培养基：①ＭＳ＋ＺＴＷ．０ｍｓ／Ｌ；②ＭＳ＋ＺＴ１．０ｍｐ／Ｌ；＠ ＭＳ＋６ＢＡ２．０ｍｇ／Ｌ＋ＮＡＡ ０．１ｍｇ／Ｌ；④１／２ＭＳ＋ＩＢＡ０．５～０．７ｍｇ／Ｌ。 蔗糖（市售白砂糖）浓度①～③培养基为３．０％，④培养基为 ２．０％；琼脂浓度为 ０．６５％～０．７０％，ｐＨ５．８～６．０，培养温度 ２５～２８℃，每天光照 １３ｈ，光照强度 １５００～２０００ １Ｘ。４ 生长与分化情况４．１ 愈伤… 相似文献
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以“夏雪”品种为试材,研究花叶万年青的组培快繁,结果表明,无菌材料的获得以ＭＳ＋ＢＡ５＋ＩＢＡ０．２为最佳。快速繁殖阶段以ＭＳ＋ＢＡ５＋ＡＤ（１－１０）＋ＩＢＡ（０．１－０．２）＋３０（Ｇ／Ｌ）糖为最佳,６－ＢＡ与ＩＢＡ的比值在１０～５０倍为宜。生根前一代用ＭＳ＋ＢＡ（１－５）＋ＩＢＡ（０．１－０．２）＋３０（Ｇ／Ｌ）糖组合有利于芽苗长高,生根培养用１／２ＭＳ＋ＩＢＡ１＋６－ＢＡ０．１,在快繁阶段 相似文献
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AIM: To study whether the excitatory amino acids (EAAs)-triggered excitotoxicity contribute to the evolution of hyperbilirubinemia-associated brain injury. METHODS: Newborn rabbits with hyperbilirubinemia were decapitated and then, Na+-K+-ATPase activities, neurotransmitters and non-neurotransmitters concentration in brains were determined. RESULTS: It was found that the activities of Na+-K+-ATPase both in brains and cytomembrane and the amounts of glutamate (P<0.05) and aspartate (P＜0.01) in homogenated brains decreased significantly. But the amounts of GABA and non-neurotransmitters increased in model group. CONCLUSION: Extracellular abnormal accumulation of EAAs caused by bilirubin-induced energy failure in brain and the inhibition in Na+-K+-ATPase activity may result in excitotoxic neuronal death in newborn rabbits. 相似文献
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AIM: To investigate the effects of aliskiren on the injury of SH-SY5Y cells induced by oxygen-glucose deprivation (OGD) and its possible mechanisms. METHODS: The SH-SY5Y cells were randomly divided into control group, OGD group and aliskiren (5.0, 10.0 and 20.0 μmol/L) groups. The cell viability was measured by CCK-8 assay. The levels of excitatory amino acid transporter 2 (EAAT2/GLT-1), EAAT3/EAAC1, EAAT4, endothelin-1 (ET-1) and S100 calcium-binding protein β subunit (S-100β) in the SH-SY5Y cells were detected by ELISA. The morphological changes of the cells were observed by Hoechst 33258 staining. Meanwhile, the content of lactic acid (LD) and activity of Na+-K+-ATPase were also analyzed. RESULTS: The viability of SH-SY5Y cells was not more than 60% after OGD injury for 4 h, so the appropriate time for OGD injury was 4 h. Compared with control group, the protein levels of GLT-1, EAAC1 and EAAT4 in the SH-SY5Y cells of OGD group were significantly decreased (P<0.05), but the protein levels of ET-1 and S-100β were significantly increased (P<0.05). Compared with OGD group, treatment with aliskiren dose-dependently increased the protein levels of GLT-1, EAAC1 and EAAT4 in the SH-SY5Y cells, but decreases in the levels of ET-1 and S-100β were observed (P<0.05). The results of Hochest 33258 staining showed that aliskiren significantly reduced the apoptosis of SH-SY5Y cells. Compared with control group, a significant increase in the content of LD (P<0.05) and a significant decrease in Na+-K+-ATPase activity (P<0.05) were found in the SH-SY5Y cells of OGD group. Compared with OGD group, aliskiren dose-dependently decreased the content of LD, but increased the Na+-K+-ATPase activity in the SH-SY5Y cells (P<0.05). CONCLUSION: Aliskiren has good neuroprotective effects on SH-SY5Y cells after OGD injury. The underlying mechanisms may be associated with the increases in the protein levels of GLT-1, EAAC1 and EAAT4, the enhancement of Na+-K+-ATPase activity, and the decreases in the levels of ET-1 and S-100β and the content of LD. 相似文献
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AIM: To evaluate the protective effect of rapid phase of ischemic preconditioning against spinal cord ischemic injury in rabbits. METHODS: Thirty six male New Zealands white rabbits were randomly assigned to 3 groups (12 in each group): ischemia and reperfusion injury group (IR group), ischemic preconditioning + IR group (IPC+IR group) and sham operation group (sham). In IR group, spinal cord ischemia was induced by an infrarenal aorta clamping for 20 min; The rabbits in IPC+IR group underwent a 6 min ischemic preconditioning followed by 30 min of reperfusion before the 20 min clamping; The rabbits in sham group underwent the same procedures as the IR group except for infrarental aortic unclamping. Neurologic status was scored at 8, 12, 24 and 48 h after reperfusion. All animals were sacrificed at 48 h after reperfusion and the spinal cords (L5-7) were removed for histopathologic study and determination of the activity of Na+, K+-ATPase. RESULTS: The neurologic function scores in sham group and IPC+IR group at each observation interval were higher than those in IR group (P＜0.01). Compared to IR group, there were more normal neurons in anterior horn of spinal cord in sham group and IPC+IR group (P＜0.01); the activity of Na+, K+-ATPase in sham group and IPC+IR group were higher than those in IR group (P＜0.01). CONCLUSION: The rapid phase of ischemic preconditioning has a protective effect against spinal cord ischemic injury in rabbits, and this neuroprotection may be related to the maintenance of Na+, K+-ATPase activity. 相似文献
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AIM: To observe the effect of Shenmai injection on the acute myocardial ischemia/ reperfusion injury in rats. METHODS: The left-anterior coronary artery was ligated for 10 minutes and then loosed for 15 minutes to establish the animal model of acute myocardial ischemia/reperfusion injury. During the process, electrocardiogram was traced continuously to observe the arrhythmia caused by reperfusion. The levels of SOD, MDA, Na+, K+-ATPase and Ca2+ -ATPase in ventricular myocardium were measured. The mitochondria was observed through electron microscope. RESULTS: Shenmai injection decreased the incidence of arrhythmia caused by reperfusion and shortened its duration. Shenmai injection improved the activity of SOD, Na+, K+-ATPase and Ca2+ -ATPase, decreased the content of MDA in myocardium and relieved the injury of mitochondria. CONCLUSION: Shenmai injection had a protective effect on acute myocardial ischemia/reperfusion injury in rats. The mechanism may be related to relieving the injury caused by oxygen free radical and calcium overload. 相似文献
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AIM:To reveal the pathogenesis of salt-induced hypertension.METHODS:Forty male SD rats were divided into five groups, which received on same chow but different drink. Control(NC)group: deionized water; High salt(HS)group: 1.5% NaCl solution; L-arginine(HS+Arg)group: L-arginine(4 g·kg-1·d-1)in 1.5% NaCl solution; Enalapril (HS+En) group: enalapril (30 mg·kg-1·d-1) in 1.5% NaCl solution; Terazozin(HS+Ter)group: terazozin(4 mg·kg-1·d-1)in 1.5% NaCl solution. At the end of 8 weeks, rats were anesthetized with pentobarbital sodium. Blood pressure(BP)were recorded and blood were drawn from inferior vena cava and kidneys, adrenals were removed. NO(x),ET and AngII, Na＋-K＋-ATPase and proscillaridin-like compound(PLC)were assayed.RESULTS:BP, PLC and ET in plasma and AngII in adrenal were increased, NO(x)and AngII in plasma and kidney were decreased in HS group compared with NC group.CONCLUSION:High salt intake may induce hypertension in SD rats. In addition to the Na＋-K＋-ATPase activity was inhibited by increased sodium-pump inhibitors, NO release decrease may also play an important role in the pathogenesis of hypertension. 相似文献
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AIM: To study mechanism of hepatocytic mitochondria damage following septic shock. METHODS: 30 SD rats were randomly divided into three groups: sham operation group, 12 h cecal ligation and puncture (CLP) group and 16 h CLP group. The model of septic shock was made by cecal ligation and puncture. The liver mitochondria respiratory control rate (RCR), phosphate/oxygen (P/O) and ATPase activities were assayed. RESULTS: In 12 h CLP group mean artery pressure (MAP) [(9.54±1.26)kPa] was significantly lower than sham operation group [(14.58±1.32)kPa,P<0.05]. However, mortality was obviously higher than sham operation group (P<0.05), the liver mitochondria respiratory control rate (1.27±0.25), phosphate/oxygen (1.67±0.34) and Na+-K+-ATPase (40.80±3.45), Ca2+-ATPase (58.00±2.43), Mg2+-ATPase (78.30±4.16), Ca2+-Mg2+-ATPase(2.70±2.25) activities decreased strikingly. The difference between 12 h CLP group and sham operation group was significant (P<0.05), 16 h CLP groups was more lower than 12 h CLP group. As RCR, P/O and ATPase activities were significantly reduced, mortality significantly increased. Futhermore, obvious positive correlation was showed between them (r=0.892,P<0.01;r=0.834,P<0.01). CONCLUSION: Liver mitochondria function of ingestion-oxygen and phosphorus-acidification are decreased and membrane fluxion is weaken. Energy metabolism is blocked and Ca2+-Mg2+ shows imbalanced. All of them cause hepatocytic mitochondria injury following septic shock. 相似文献
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AIM:To explore the significance of platelet activation, fibrinolytic activity and the changes of vasoactive mediators in acute myocardial infarction in rabbits and the intervention of amiodarone and metoprolol.METHODS:Fifty New Zealand white rabbits were randomly assigned to five groups, ten for each. Group Ⅰ: sham group, group Ⅱ: acute myocardial infarction(AMI) group, group Ⅲ: AMI and lidocaine group, group Ⅳ: AMI and amiodarone group, group Ⅴ: AMI and metoprolol group.The middle point of left ventricular coronary artery was ligated (groupⅡ,Ⅲ, Ⅳ and Ⅴ ) or a sham ligation(group Ⅰ). Four hours later, blood was collected for measuring plasma concentration of TXB2, 6-Keto-PGF1α, ET, NO, plasma activity of t-Pa and PAI.After that, the heart was taken out to evaluate the infarction size(IS).RESULTS:Plasma concentration of TXB2, ET, NO and plasma activity of PAI were significantly higher in groupⅡ,Ⅲ, Ⅳ and Ⅴ than those in group Ⅰ(P＜0.01), but the plasma concentration of 6-Keto-PGF1α and plasma activity of t-Pa were remarkably lower in groupⅡ,Ⅲ, Ⅳ and Ⅴ than those in group Ⅰ(P＜0.01). There were no difference in plasma concentration of TXB2, 6-Keto-PGF1α, t-Pa activity and infarction size in group Ⅱ,Ⅲ and Ⅳ(P＞0.05).Compared to group Ⅱ, plasma concentration of ET, NO and PAI activity were significantly decresed (P＜0.01)in group Ⅳ. Plasma concentration of TXB2, ET, NO and plasma activity of PAI were significantly lower in groupⅤ than those in group Ⅱ(P＜0.01). Conversely, plasma concentration of 6-Keto-PGF1 and plasma activity of t-Pa were remarkably higher in group Ⅴ than those in group Ⅱ(P＜0.01). The infarction size was remarkly decrease(P＜0.01)in group Ⅴ.CONCLUSIONS:Amiodarone inhibited PAI avtivity, decreased release of ET and NO in AMI in rabbits. Metoprolol inhibited platelet activation, improved fibrinolytic, decreased release of ET and NO, and reduced myocardial infarction size in AMI in rabbits; Lidocaine had no effect above. 相似文献
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LI Jian-sheng ZHAO Jun-mei GUO Sheng-dian ZHANG Wei-hong ZHAO Jing GAO Ai-she LI Jian-guo 《园艺学报》2001,17(11):1052-1055
AIM: To study the mechanism of brain ischemia-reperfusion injury from ATPase activity and free radical metabolism in aged rats. METHODS: The young rats (5 months) and the aged rats (more than 20 months) were divided into young control group(YCG), young model group(YMG), aged control group(ACG) and aged model group(AMG). The ATPase and SOD activities and the contents of MDA, Ca2＋, Na＋ and K＋ were measured in the rats with 30 min brain ischemia followed by 60 min reperfusion. RESULTS: The Ca2＋content in the AMG was higher than that in the YMG and the ACG. The Na＋-K＋-ATPase activity in the ACG was lower than that in the YCG,was lower in the AMG than that in the YMG. The Ca2＋-ATPase activities in the YCG was higher than that in the ACG, was lower in the AMG than that in the YMG and was higher than the ACG's. The serum and brain tissue SOD activities in the ACG was lower than that in the YCG, was lower in the AMG than YMG 's. The serum and brain tissue MDA/SOD ratio in the AMG was higher than that in the ACG.CONCLUSION:The brain tissue ischemia-reperfusion injury was related with calcium overload and free radical injury.The pathological changes were obvious and had some characteristics in the aged rats compared with the young rats because of the brain t issue aging changes in ATPase,calcium content and free radical metabolism in the aged rats. 相似文献
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OUYANG Jing-ping LIU Yong-ming ZHENG Han-qiao WEI Lei TU Shu-zhen YANG Hai-lu CUI Ye-jian 《园艺学报》2000,16(1):70-73
AIM: The effects of BDM on isolated rat heart in cold cardioplegia were studied. METHODS: Rat heart were subjected to cold cardioplegia at 4℃ for 8, 18 and 24 h.Then each heart was perfused (90 cm H2O) in Langendorff model at 37℃ for 40 min. In the high K+ group(n=24) the hearts were preserved in St.Thomas cardioplegic solution, in BDM group(n=24) hearts were preserved in K-H solution with BDM 30 mmoL/L. RESULTS: After 18 h, heart rate and the coronary flow in BDM group were significantly higher than in high K+ group(P＜0.05). Activity of Na+-K+-ATPase in cell membrane and in mitochondrial membrane in the BDM group was significantly higher than high K+ group(P＜0.01). After 24 h, all hearts in high K+ group were dead, but were alive in BDM group. CONCLUSION: Under given experiment conditions, BDM did enhance the tolerance to cold ischemia significantly. The results showed that BDM may become a useful agent for prolong the storage period of heart in cold cardioglegia. 相似文献
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AIM: To explore the pathophysiological bases in the pathogenesis of the lasting emotional behavioral disorders following posttraumatic stress disorder(PTSD). METHODS: 240 male Wistar rats were divided randomly into 3 groups. Group SE(n =96) for rats with PTSD-like behavior by constant pulsating current of 100 μA with intratrain frequencies of 16 Hz, pulsating duration of 1 ms, train duration of 10 s and interstimulus interval of 7 min for 5 days with 8 times per day. Group CE(n =96) for control with electrode implanted in hippocampus without stimulation, and Group NC(n =48) for normal control. The activities of Na+-K+-ATPase and Ca2+ -ATPase, levels of intracellular calcium and free calmodulin(CaM), and the total CaM expression were detected in hippocampi of experimental rats. RESULTS: The activities of Na+-K+-ATPase and Ca2+ -ATPase in mitochondria of hippocampal cells in Group SE rats were significantly decreased at 48 h and 72 h after the last stimulation, respectively. The intracellular free calcium levels were increased, and the mean channel fluorescence of intracellular free CaM decreased remarkably at 72 h poststimulation, while the expression of total CaM was significantly elevated at 48 h after the last stimulation in hippocampi of Group SE rats. CONCLUSION: The lasting increased levels of intracellular free calcium and expression of Ca2+ -CaM in hippocampus, as well as the dysfunction of Na+-K+ pump and Ca2+ -ATPase in mitochondria may play important roles in the long-term neuropsychological sequelae in PTSD. 相似文献