Response of Nitrate Metabolism in Seedlings of Oilseed Rape(Brassica napus L.) to Low Oxygen Stress

In order to understand the response of nitrate metabolism in seedlings of oilseed rape （Brassica napus L.） to low oxygen stress （LOS）, two cultivars were studied at different light, LOS time and exogenous nitrate concentrations under hydroponic stress. Results show that N-uptake and dry matter of rape seedlings were decreased after LOS stress while nitrate accumulation （NA） under LOS was induced by darkness. Nitrate accumulation peaked at 3 d while root activity （RA, deifned as dehydrogenase activity） decreased with prolonged waterlogging exposure. Exogenous nitrate signiifcantly elevated NA and RA. Tungstate （TS） and LOS inhibited nitrate reductase （NR） activity while NR transcription and activity were enhanced by exogenous nitrate. Low oxygen stress stimulated the activity of superoxide dismutase （SOD） and peroxidase （POD） slightly, but inhibited that of catalase （CAT）. B. napus L. Zhongshuang 10 （ZS10）, a LOS tolerant cultivar, displayed smaller decrease upon dry matter under LOS, higher NA in darkness and lower NA in light than B. napus L. Ganlan CC （GAC）, a LOS sensitive variety. ZS10 had lower NA and higher RA after waterlogging and exogenous nitrate treatment, and higher NR activity under TS inhibition than GAC, but the activity of antioxidant enzymes did not change under LOS. The results indicate that nitrate metabolism involved tolerance of rape seedlings to LOS, with lower accumulation and higher reduction of nitrate being related to higher LOS tolerance of rape seedlings exposed to waterlogging.

Progress in Researches on the Effect of Acupuncture in Antagonizing Oxygen Stress

Oxidation and free radicals participate in the pathological process of multiple diseases in organisms, and acupuncture shows good effect in antagonizing oxygen stress (OS). This article reviews the effect of acupuncture in antagonizing oxygen stress and the mechanism of its anti-free radical effect in various diseases. The authors hold that acupuncture not only has a chain-blocking effect, but also has preventive and repairing effects of anti-oxidation. And anti-OS action is one of the important mechanisms of acupuncture.

Stress corrosion cracking behavior of 310S in supercritical water with different oxygen concentrations

The effect of dissolved oxygen(DO) on the stress corrosion cracking(SCC) of 310 S in supercritical water was investigated using slow-strain-rate tensile tests.The tensile properties, fracture morphology, and distribution of the chemical composition of the oxide were analyzed to evaluate the SCC susceptibility of 310 S. The results showed that the rupture elongation decreased significantly as the degree of DO increased. A brittle fracture mode was observed on the fracture surface, and only intergranular cracking was observed on the surface of the gauge section, regardless of the DO. Cracks were widely distributed on the gauge surface near the fracture surface.Oxides were observed in the cracks with two-layered structures, i.e., a Cr-rich inner oxide layer and an Fe-rich outer oxide layer.

Hyperbaric oxygen preconditioning improves postoperative cognitive dysfunction by reducing oxidant stress and inflammation

Postoperative cognitive dysfunction is a crucial public health issue that has been increasingly studied in efforts to reduce symptoms or prevent its occurrence. However, effective advances remain lacking. Hyperbaric oxygen preconditioning has proved to protect vital organs, such as the heart, liver, and brain. Recently, it has been introduced and widely studied in the prevention of postoperative cognitive dysfunction, with promising results. However, the neuroprotective mechanisms underlying this phenomenon remain controversial. This review summarizes and highlights the definition and application of hyperbaric oxygen preconditioning, the perniciousness and pathogenetic mechanism underlying postoperative cognitive dysfunction, and the effects that hyperbaric oxygen preconditioning has on postoperative cognitive dysfunction. Finally, we conclude that hyperbaric oxygen preconditioning is an effective and feasible method to prevent, alleviate, and improve postoperative cognitive dysfunction, and that its mechanism of action is very complex, involving the stimulation of endogenous antioxidant and anti-inflammation defense systems.

Effects of Water Stress on Reactive Oxygen Species Generation and Protection System in Rice During Grain-Filling Stage

Rice is one of the main staple food crops in the world, but it may suffer serious water stress during growth period. Water stress during grain filling results in decreased grain yeild, but its mechanism generating and scavenging the active oxygen is unclear under continuance of the water stress. The experiment was carried out in growth chamber to investigate the effects of water stress on the production of superoxide free radical （O2）, hydrogen peroxide （H202）, malondialdehyde （MDA）, reduced glutathione （GSH）, ascorbic acid （AsA）, and antioxidative enzyme activities in three rice hybrids with differing drought resistant under both normal and drought conditions during grain-filling stage. The results showed that water stress aggravated the membrane lipid peroxidation in rice leaves, which was more severe in less drought resistant hybrids than that in more tolerant ones. Also O2＇ and H2O2 accumulated more rapidly in less drought resistant hybrids than that in more tolerant ones. During water stress, decreases of GSH, AsA, chlorophyll, and relative water contents in more drought resistant hybrids were obvious less than those in less tolerant ones. Activities of superoxide dismutase （SOD）, catalase （CAT） and peroxidase （POD） in/eaves increased obviously in 0-14 d after heading and subsequently decreased rapidly, and those in more drought resistant hybrids were more than those in less tolerant ones. The results showed that changes of O2, H2O2, MDA, GSH, and AsA contents and antioxidative enzyme activities correlated significantly to drought resistance of rice hybrids, and more drought resistant hybrids possessed high ant oxidation capacity.

Edaravone protects against oxygen-glucose-serum deprivation/restoration-induced apoptosis in spinal cord astrocytes by inhibiting integrated stress response

We previously found that oxygen-glucose-serum deprivation/restoration（OGSD/R） induces apoptosis of spinal cord astrocytes, possibly via caspase-12 and the integrated stress response, which involves protein kinase R-like endoplasmic reticulum kinase（PERK）, eukaryotic initiation factor 2-alpha（eIF2α） and activating transcription factor 4（ATF4）. We hypothesized that edaravone, a low molecular weight, lipophilic free radical scavenger, would reduce OGSD/R-induced apoptosis of spinal cord astrocytes. To test this, we established primary cultures of rat astrocytes, and exposed them to 8 hours/6 hours of OGSD/R with or without edaravone（0.1, 1, 10, 100 μM） treatment. We found that 100 μM of edaravone significantly suppressed astrocyte apoptosis and inhibited the release of reactive oxygen species. It also inhibited the activation of caspase-12 and caspase-3, and reduced the expression of homologous CCAAT/enhancer binding protein, phosphorylated（p）-PERK, p-eIF2α, and ATF4. These results point to a new use of an established drug in the prevention of OGSD/R-mediated spinal cord astrocyte apoptosis via the integrated stress response.

Organogermanium (Ge-132) Suppresses Activities of Stress Enzymes Responsible for Active Oxygen Species in Monkey Liver Preparation

Assays of stress enzymes related to active oxygen species were performed by using an in vitro preparation from the liver of a monkey (Japanese Macaque). Ge-132, an organic germanium compound, viz. poly-trans-[(2-carboxyethyl) germasesquioxane] [(GeCH2CH2COOH)2O3]n, suppressed the activities of NADH-dependent oxidase and NADPH-dependent oxidase [NAD(P)H-OD] and xanthine oxidase (XOD) as superoxide-forming enzymes, while promoting the activities of superoxide dismutase (SOD) as a superoxide-scavenging enzyme and catalase (CAT) as an enzyme responsible for degradation of hydrogen peroxide (H2O2). The evidence suggests that the levels of active oxygen species such as and H2O2 would be reduced by Ge-132. The possible connection between Ge-132 and activities of stress enzymes is discussed on the basis of these results.

Effect of Cd, Pb Stress on the Activated Oxygen Scavenging System in Tobacco Leaves

The effect of Cd, Pb stress on the activated oxygen scavenging system indicates thatthe content of chlorophyll, chlorophyll a/b ratio and the activity of CAT gradually decrease,the activity of SOD increases first and then decreases, and the activity of POD gradually increases with increasing concentrations of Cd and Ph. Between Cd and Ph there is synergism inthe activated oxygen scavenging system. The results show that the stress of Cd and Pb can affect the scavenging system of activated oxygen and result in imbalance of activated oxygenmetabolism.

Regulation of heme oxygenase expression by alcohol,hypoxia and oxidative stress

AIM:To study the effect of both acute and chronic alcohol exposure on heme oxygenases(HOs) in the brain,liver and duodenum.METHODS:Wild-type C57BL/6 mice,heterozygous Sod2 knockout mice,which exhibit attenuated manganese superoxide dismutase activity,and liver-specific ARNT knockout mice were used to investigate the role of alcohol-induced oxidative stress and hypoxia.For acute alcohol exposure,ethanol was administered in the drinking water for 1 wk.Mice were pair-fed with regular or ethanol-containing Lieber De Carli liquid diets for 4 wk for chronic alcohol studies.HO expression was analyzed by real-time quantitative polymerase chain reaction and Western blotting.RESULTS:Chronic alcohol exposure downregulated HO-1 expression in the brain but upregulated it in the duodenum of wild-type mice.It did not alter liver HO-1 expression,nor HO-2 expression in the brain,liver or duodenum.In contrast,acute alcohol exposure decreased both liver HO-1 and HO-2 expression,and HO-2 expression in the duodenum of wild-type mice.The decrease in liver HO-1 expression was abolished in ARNT+/-mice.Sod2+/-mice with acute alcohol exposure did not exhibit any changes in liver HO-1 and HO-2 expression or in brain HO-2 expression.However,alcohol inhibited brain HO-1 and duodenal HO-2 but increased duodenal HO-1 expression in Sod2+/-mice.Collectively,these findings indicate that acute and chronic alcohol exposure regulates HO expression in a tissue-specific manner.Chronic alcohol exposure alters brain and duodenal,but not liver HO expression.However,acute alcohol exposure inhibits liver HO-1 and HO-2,and also duodenal HO-2 expression.CONCLUSION:The inhibition of liver HO expression by acute alcohol-induced hypoxia may play a role in the early phases of alcoholic liver disease progression.

Effects of Exogenous NO on Active Oxygen Metabolism in Cucumber Seedlings under NaCl Stress

Employing nutrient solution hydroponic method,the effects of exogenous nitric oxide（NO）on the growth and active oxygen metabolism in cucumber（Cucumis sativus L.）seedlings under NaCl stress were investigated.The results indicated that NaCl treatment significantly inhibited the growth of cucumber seedlings,while exogenous NO could significantly alleviate the inhibitory effects of NaCl stress on seedling growth.Especially,0.1 mmol/L SNP treatment exhibited better effects than 0.5 mmol/L SNP treatment on alleviating NaCl stress.Under 0.1 mmol/L NaCl stress,adding 0.1 mmol/L exogenous NO could significantly decrease the generation rate of O·-2and MDA content,significantly improve soluble protein content and enhance the activities of SOD,POD and CAT,thus reducing the damage of salt stress to cucumber seedlings.

Effects of salt-alkali stress on active oxygen metabolism in roots of Spiraea × bumalda 'Gold Mound' and Spiraea × bumalda 'Gold Flame'

Under artificially-simulated complex salt-alkali stress, the levels of active oxygen metabolism in roots were studied using three-year-old cutting seedlings of Spiraea × bumalda ‘Gold Mound＇ and Spiraea × bumalda ‘Gold Flame＇. The present study aimed at exploring the antioxidant capacity in roots of spiraeas and revealing their adaptability to salt-alkali stress. Results indicate that the oxygen free radicals contents, electrolyte leakage rates and MDA contents in roots of Spiraea × bumalda ＇Gold Mound＇ and Spiraea × bumalda ＇Gold Flame＇ show an increasing tendency with the increases of the salinity and pH value, whereas the activities of superoxide dismutase （SOD）, peroxidase （POD） and catalase （CAT） all increased firstly and then decreased. With the increase in intensity of salt-alkali stress, the CAT activity in roots of Spiraea × bumalda ‘Gold Flame＇ is higher and the increasing extents in the oxygen free radicals contents, electrolyte leakage rates as well as MDA contents are lower compared with Spiraea × bumalda ‘Gold Mound＇, indicating that Spiraea × bumalda ‘Gold Flame＇ has a stronger antioxidant capacity.

Production of reactive oxygen species by freezing stress and the protective roles of antioxidant enzymes in plants

As one of the most severe environmental stresses, freezing stress can determine native flora in nature and severely reduce crop production. Many mechanisms have been proposed to explain the damage induced by freezing-thawing cycle, and oxidative stress caused by uncontrollable production of harmful reactive oxygen species (ROS) are partially contributed to causing the injury. Plants in temperate regions have evolved a unique but effective metabolism of protecting themselves called cold acclimation. Cold-acclimating plants undergo a complex but orchestrated metabolic process to increase cold hardness triggered by exposure to low temperature and shortened photoperiod and achieve the maximum freezing tolerance by a concerted regulation and expression of a number of cold responsive genes. A complicated enzymatic system have been evolved in plants to scavenge the ROS to protect themselves from oxidative stress, therefore, cold-acclimating plants are expected to increase the de novo synthesis of the genes of antioxidant genes. Indeed, many antioxidant genes increase the expression levels in response to low temperature. Furthermore, the higher expression of many antioxidant enzymes are positively correlated to inducing higher tolerance levels against freezing. All the information summarized here can be applied for developing crop and horticultural plants to have more freezing tolerance for higher production with better quality. There have been extensive studies on the activities of antioxidant enzymes and the gene regulation, however, more researches will be required in near future to elucidate the most effective antioxidant enzymes to induce highest freezing tolerance in a crop plant in a transformation process or a breeding program.

Longevity of animals under reactive oxygen species stress and disease susceptibility due to global warming

The world is projected to experience an approximate doubling of atmospheric CO_2 concentration in the next decades. Rise in atmospheric CO_2 level as one of the most important reasons is expected to contribute to raise the mean global temperature 1.4 ℃-5.8 ℃ by that time. A survey from 128 countries speculates that global warming is primarily due to increase in atmospheric CO_2 level that is produced mainly by anthropogenic activities. Exposure of animals to high environmental temperatures is mostly accompanied by unwanted acceleration of certain biochemical pathways in their cells. One of such examples is augmentation in generation of reactive oxygen species(ROS) and subsequent increase in oxidation of lipids, proteins and nucleic acids by ROS. Increase in oxidation of biomolecules leads to a state called as oxidative stress(OS). Finally, the increase in OS condition induces abnormality in physiology of animals under elevated temperature. Exposure of animals to rise in habitat temperature is found to boost the metabolism of animals and a very strong and positive correlation exists between metabolism and levels of ROS and OS. Continuous induction of OS is negatively correlated with survivability and longevity and positively correlated with ageing in animals. Thus, it can be predicted that continuous exposure of animals to acute or gradual rise in habitat temperature due to global warming may induce OS, reduced survivability and longevity in animals in general and poikilotherms in particular. A positive correlation between metabolism and temperature in general and altered O_2 consumption at elevated temperature in particular could also increase the risk of experiencing OS in homeotherms. Effects of global warming on longevity of animals through increased risk of protein misfolding and disease susceptibility due to OS as the cause or effects or both also cannot be ignored. Therefore, understanding the physiological impacts of global warming in relation to longevity of animals will become very crucial challenge to biologists of the present millennium.

Determination of Heat Stress and Ultra Low Oxygen in Chestnut Storage under Control and Modified Atmospheres

The effects of heat stress (HS) and ultra low oxygen (ULO) in controlled (CA) or modified (MA) atmosphere on chestnut (Castanea sativa L. cv. Rodiana) fruit quality and storability were investigated. Chestnuts exposed to ULO (1% O2 for 1 h) or dipped in water bath (at 55?C for 15 min) and then stored to CA or MA conditions at 6?C for up to 90 days. The HS dipping and storage in CA or MA increased sprouting (up to 60%) as well as mould severe on chestnuts com-paring with the control. In MA conditions, HS and ULO increased respiration rate. Total starch content increased (up to 30%) in MA-HS and MA-ULO treatments comparing with the control the first 60 days of storage. The first 30 days of CA and MA storage, chestnut moisture content decreased. No major differences observed in total sugar, total fat and total phenolic content as well as in the incidence of hole with or without worm in chestnut fruit. Following sensory evaluation, 57% of panelist marked differences among treatments, while the greater preference (67%) observed in chestnut treated with HS and stored in MA. Additionally, MA-HS enhanced (up to 30%) the chestnut appearance while no difference observed in aroma, sweetness and texture among treatments and storage conditions. Thus, the impacts of HS on chestnuts maintain fruit quality, with benefits in CA storage, as increased panelists’ preference.

基于归因理论的护理干预在经鼻高流量氧疗患者中的应用效果

目的探讨基于归因理论的护理干预在经鼻高流量氧疗(HFNC)患者中的应用价值,以期为临床治疗提供参考。方法选取2021年2月-2023年5月于四川大学华西医院接受治疗的144例HFNC患者为研究对象。采用随机数字表法将患者分为观察组和对照组,每组72例。对照组患者给予常规护理干预,观察组患者在对照组基础上联合基于归因理论的护理干预。比较2组患者遵医情况及护理满意度;比较2组患者干预前后疾病感知问卷(BIPQ)、Borg疲劳量表、视觉类比呼吸困难法量表(VAS)、抑郁自评量表(SDS)及焦虑自评量表(SAS)评分。结果观察组患者总遵从率高于对照组,差异有统计学意义(P<0.05)。干预前,2组患者BIPQ中治疗控制、后果、情绪、持续时间、症状、关注、个人控制、疾病了解评分比较,差异无统计学意义(P>0.05)。干预后,2组患者BIPQ中治疗控制、后果、情绪、持续时间、症状、关注、个人控制、疾病了解评分均高于干预前,且观察组高于对照组,差异均有统计学意义(P<0.05)。干预前,2组患者Borg疲劳量表及VAS评分比较,差异无统计学意义(P>0.05)。干预后,2组患者Borg疲劳量表评分均低于干预前,且观察组低于对照组;VAS评分高于干预前,且观察组高于对照组,差异均有统计学意义(P<0.05)。干预前,2组患者SAS、SDS评分比较,差异无统计学意义(P>0.05)。干预后,2组患者SAS、SDS评分均低于干预前,且观察组低于对照组,差异均具有统计学意义(P<0.05)。观察组患者护理总满意度高于对照组,差异有统计学意义(P<0.05)。结论基于归因理论的护理干预能有效强化患者的遵医行为,减轻患者的疾病感知压力,缓解患者的负面情绪,提高患者的护理满意度,值得临床推广应用。

rh-CSF1改善缺糖缺氧损伤神经元线粒体功能和细胞凋亡

目的探讨集落刺激因子-1(colony stimulating factor-1,CSF1)抑制氧糖剥夺(oxygen-glucose deprivation,OGD)神经元凋亡的作用机制。方法采用大鼠原代大脑皮质神经元,分为OGD损伤神经元模型组(OGD组,n=3)、重组人CSF1(recombined human CSF1,rh-CSF1)干预组(rh-CSF1组,n=3)、对照组(n=3)。测定3组神经元凋亡率和其中三磷酸腺苷(adenosine triphosphate,ATP)含量,活性氧簇水平、线粒体膜电位和线粒体脱氧核糖核酸(deoxyribonucleic acid,DNA)拷贝数,检测线粒体内丙二醛含量和超氧化物歧化酶活性。结果OGD组模型进行基线评估,结果示神经元凋亡率、活性氧簇、线粒体内丙二醛水平、线粒体膜电位、线粒体DNA拷贝数、ATP含量、线粒体内超氧化物歧化酶活性与对照组有统计学差异(P<0.01)。rh-CSF1干预可提高OGD损伤后神经元的线粒体膜电位(0.55±0.03 vs.0.43±0.06,P<0.01)、线粒体DNA拷贝数(0.88±0.05 vs.0.72±0.06,P<0.05)、ATP含量([15.70±0.99)mmol/mg vs(.11.70±1.00)mmol/mg,P<0.01)]和线粒体内超氧化物歧化酶活性([18.47±1.38)U/mg vs.14.78±1.81)U/mg,P<0.05)],降低活性氧簇(3.64±0.21 vs.4.45±0.33,P<0.05)和线粒体内丙二醛水平([2.13±0.19)mmol/mg vs(.2.78±0.20)mmol/mg,P<0.05)],减轻神经元凋亡率。结论rh-CSF1可能通过改善线粒体功能、减轻氧化应激及抑制细胞凋亡,从而改善OGD诱导损伤神经元的受损程度。

维生素C与糖尿病视网膜病变相关研究

糖尿病视网膜病变(DR)是一种致盲性眼病,已经成为全世界面临的较为严重的公共卫生负担。而DR的发病机理不是完全明确,预防较治疗意义更大,糖尿病患者未发生DR之前运用各种有效方法干预可能对延缓DR发展有积极作用。氧化应激参与DR的发病过程,而维生素C又称抗坏血酸(AA)是临床常用的一种抗氧化剂,能通过减轻抗坏血酸过氧化物酶(ascorbate peroxidase)sch的氧化应激(oxidative stress)而起到抗氧化作用。还有许多重要的生物合成过程中也需要AA参与。在糖尿病患者中,血清AA水平较低。AA补充可能通过其抗氧化作用延缓DR的发展。本文就AA与DR之间的关系及机制作一综述。

反季节龙眼不同发育时期果实脱落响应差异与果实呼吸耗氧量的关系

反季节龙眼在果实发育过程中落果现象非常严重。前期的研究表明,果实中碳水化合物水平的下降与果实脱落密切相关。为了进一步了解不同发育时期果实的碳水化合物代谢变化与脱落差异的关系,以反季节储良龙眼为试材,果穗从树上剪下后迅速插入清水中并去除叶片诱发果实脱落,通过测定胁迫处理下3个发育时期果实落果率、呼吸耗氧量、果柄分离力变化,检测不同光强对3个时期果实呼吸的影响,发现不同发育时期龙眼果实对脱落的敏感性不同。饥饿胁迫迅速启动了各发育时期果实的脱落响应,但3个时期果实脱落响应差异较大,幼果期果实对饥饿胁迫的响应较中期和后期延后2 d,果实发育中期和后期脱落响应更剧烈;幼果期果实呼吸耗氧量较低,而果实发育中期和后期呼吸耗氧量较高;随着光强的增加,仅幼果期果实呼吸作用未造成氧气的下降,还出现了氧气的释放。幼果期果柄分离力下降也较果实发育中期和后期缓慢。因此,本研究结果表明,在胁迫条件下果实呼吸作用与果实脱落密切相关,果实呼吸强度越强;在饥饿胁迫条件下果柄分离力下降越快,果实脱落越快。龙眼幼果期可通过果皮进行光合作用部分代偿呼吸对碳水化合物的消耗。幼果期饥饿胁迫下落果慢的主要原因是低的呼吸消耗和具有一定的光合能力,因此,龙眼幼果是一个部分自养的器官。

橙皮素抑制氧化应激影响软骨细胞的炎性退变

背景:研究表明,橙皮素可以通过多种机制或者信号通路对软骨细胞产生保护作用,但其保护机制尚未完全阐明。目的:探讨橙皮素对脂多糖诱导的软骨细胞炎性退变的影响。方法:体外提取、培养SD乳鼠关节软骨细胞,采用番红O染色鉴定。通过MTT法检测细胞毒性确定最佳橙皮素干预浓度。将软骨细胞随机分为3组:对照组、模型组和实验组,后2组采用脂多糖诱导软骨细胞建立骨关节炎细胞模型,实验组造模后给予橙皮素干预24 h。采用Calcein-AM/EthD-Ⅰ染色检测细胞活性,免疫组化染色检测软骨特异性Ⅱ型胶原的表达,活性氧检测试剂盒检测软骨细胞内活性氧水平,ELISA检测软骨细胞内抗氧化剂总谷胱甘肽水平,qRT-PCR检测炎症基因白细胞介素1β、白细胞介素6、肿瘤坏死因子α和软骨特异性基因Ⅱ型胶原基因的表达。结果与结论:①番红O染色结果表明,提取的细胞为软骨细胞;②细胞毒性实验表明0.5μmol/L橙皮素干预软骨细胞活力最明显;③与对照组比较,模型组软骨细胞增殖能力降低,活性氧水平升高,总谷胱甘肽水平下降,Ⅱ型胶原降解增加,白细胞介素1β、白细胞介素6和肿瘤坏死因子α基因表达水平升高,软骨特异性Ⅱ型胶原基因表达水平下降,差异均有显著性意义(P<0.05);④与模型组比较,实验组软骨细胞增殖能力上升,活性氧水平下降,总谷胱甘肽水平上升,Ⅱ型胶原降解减少,白细胞介素1β、白细胞介素6和肿瘤坏死因子α基因表达水平下降,软骨特异性Ⅱ型胶原基因表达水平升高(P<0.05)。结果表明:橙皮素对脂多糖诱导的骨关节炎软骨细胞炎性退变具有保护作用,其机制可能与橙皮素抑制活性氧介导的氧化应激有关。

α-乳白蛋白及其组合物对秀丽隐杆线虫睡眠的改善作用

失眠的发病率逐年升高,亟需开发具有改善睡眠功效的活性物。该研究利用秀丽隐杆线虫(Caenorhabditis elegans)从α-乳白蛋白、γ-氨基丁酸、L-茶氨酸和百合提取物四种活性物中筛选出改善睡眠效果最佳的物质并探究其改善睡眠的机制,最后将其开发成具有改善睡眠功效的复合组合物。结果表明,四种活性物均能降低与线虫睡眠相关的活性氧水平,且α-乳白蛋白改善线虫与睡眠相关的氧化应激效果最佳。经α-乳白蛋白干预后,线虫线粒体损伤减少了65.00%(P<0.05),并且应激胁迫下线虫最大寿命显著延长了4.10%(P<0.05)。最后,含α-乳白蛋白复合组合物促睡眠效果最佳的配方不仅能将线虫发育阶段睡眠的睡眠时长和睡眠频率分别提高7.97%(P<0.05)和59.43%(P<0.05),还能显著降低线虫应激诱导睡眠的运动速率。综上所述,四种活性物中,改善线虫睡眠相关氧化应激效果最佳的是α-乳白蛋白并且其改善睡眠的机制与线粒体修复有关,含α-乳白蛋白复合组合物具有改善线虫睡眠的作用。