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1.
【目的】 研究在体外培养液中添加碱性成纤维细胞生长因子(bFGF)对3-硝基丙酸(3-NPA)处理的小鼠受精卵体外发育能力的影响, 为提高氧化应激早期胚胎体外发育质量提供参考。【方法】 在小鼠受精卵体外培养液中添加0、20、50、100和150 ng/mL bFGF, 培养24、48和96 h, 统计2-细胞率、4-细胞率和囊胚率, 筛选最佳bFGF处理浓度。经腹腔注射12.5 mg/kg 3-NPA生产氧化应激体内受精卵, 正常组小鼠腹腔注射等体积生理盐水, 将获得的受精卵分为添加或不添加bFGF组, 即3-NPA和3-NPA+bFGF组及对照组(C)和bFGF组, 培养到囊胚后, 用DCFH-DA检测胚胎内活性氧(reactive oxygen species, ROS)水平, CMF2HC检测谷胱甘肽(glutathione, GSH)水平, JC-1检测早期胚胎线粒体膜电位强度。【结果】 0、20、50、100和150 ng/mL bFGF组2-细胞率均无显著差异(P>0.05), 100 ng/mL bFGF组囊胚率显著高于其他各组(P<0.05), 150 ng/mL bFGF组4-细胞率和囊胚率均显著低于其他各组(P<0.05), 因此后续试验选用100 ng/mL bFGF。3-NPA+bFGF组4-细胞率显著高于3-NPA组(P<0.05), bFGF组囊胚率显著高于其他组(P<0.05)。bFGF+3-NPA组囊胚率显著高于3-NPA组(P<0.05);与对照组相比, 3-NPA组ROS水平显著升高(P<0.05), bFGF组ROS水平显著降低(P<0.05);3-NPA组GSH和线粒体膜电位水平均显著降低(P<0.05), bFGF组GSH和线粒体膜电位水平均显著增加(P<0.05)。bFGF+3-NPA组ROS水平显著低于3-NPA组(P<0.05), GSH和线粒体膜电位水平均显著高于3-NPA组(P<0.05)。【结论】 在体外培养液中添加100 ng/mL bFGF可减少3-NPA诱导的胚胎氧化应激、改善胚胎线粒体功能, 从而提高小鼠受精卵体外发育的能力。  相似文献   

2.
Viability of maternally heat-stressed mouse zygotes in vivo and in vitro   总被引：3，自引：0，他引：3  
Mammalian preimplantation embryos are susceptible to heat stress. This present study examined how maternal heat stress affects the development of mouse zygotes in vivo and in vitro. In Experiment 1, zygotes collected from female mice that were heat‐stressed for 12 h on day 1 of pregnancy were cultured in vitro. Maternally heat‐stressed zygotes developed normally to the two‐cell stage, but the majority of embryos failed to develop into morulae or blastocysts. In Experiment 2, pregnant mice were heat‐stressed on day 1 or from day 1 to day 3 of pregnancy. The number of living fetuses on day 14 of pregnancy was lower in heat‐stressed mice than in non‐stressed mice, but the difference was significant only in successively heat‐stressed mice. These results demonstrate that maternally heat‐stressed zygotes have reduced in vitro viability, but this phenomenon does not necessarily lead to embryo loss in the maternal environment.  相似文献   

3.
Grape pomace is a by‐product of winemaking process and rich in bioactive compounds such as plant polyphenols having antioxidant and antimicrobial activities. As known, oxidative stress may cause a number of pathological conditions in farm animals and thus affecting animal welfare and production. Moreover, pathogenic bacteria affect animals’ health status. Thus, the objective of this study was to investigate whether lambs’ feed supplemented with grape pomace enhances the antioxidant mechanisms and reduces the growth of pathogenic bacteria. For this purpose, redox status was assessed in blood and tissues using oxidative stress markers in lambs fed with diet supplemented with grape pomace. Moreover, the effect on bacterial growth was assessed by examining microbial populations in lambs’ faecal microflora. The following oxidative stress markers were assessed: reduced glutathione (GSH), catalase activity (CAT), total antioxidant capacity (TAC), thiobarbituric acid‐reactive substances (TBARS) and protein carbonyls (CARB). Twenty‐four lambs were assigned to two experimental groups receiving standard or experimental diet for 55 days. Blood and tissues (liver, quadriceps muscle, spleen, heart and brain) were collected at two different time‐points, 42 and 70 days post‐birth, after ration administration. The results showed that lambs fed with experimental diet had significantly increased antioxidants mechanisms in blood and tissues as shown by increases in CAT and GSH compared to control. Moreover, lambs fed with the experimental diet exhibited decreased oxidative stress‐induced damage to lipids and proteins as shown by decreases in TBARS and CARB respectively. In addition, the experimental diet enhanced the growth of facultative probiotic bacteria and inhibited the growth of pathogen populations such as Enterobacteriacae and E. coli. This is the first study investigating the effect of diet supplemented with grape pomace on the redox status and microbiota of lambs.  相似文献   

4.
The aim of the present study was to describe some of the oxidative stress parameters in bitches suffering from spontaneously occurring mammary gland tumours. The experiment involved 28 bitches which had mammary gland tumours removed surgically (15 bitches with malignant tumour and 13 with benign tumour) as well as 10 clinically healthy bitches. The activities of glutathione peroxidase (GSH-Px) and superoxide dismutase (SOD) were determined in haemolysates of erythrocytes derived from the animals. The concentrations of thiobarbituric acid reactive substances (TBARS), as well as -SH groups, were determined in blood plasma. GSH-Px activity was significantly higher in the malignant tumour group than in healthy animals. SOD activity was significantly higher in animals with tumours compared with the control group. Activities of both enzymes were higher in animals with malignant tumours than in benign groups, but the differences were not statistically significant. The concentrations of TBARS and -SH groups were similar in all examined groups. The increase of antioxidative enzyme activities in these animals may suggest the activation of antioxidative defence mechanisms in mammary gland carcinogenesis. Moreover, it might indicate the participation of oxidative stress in malignancies. Further experiments involving more animals, with more frequent sample collection and the use of other oxidative stress markers are necessary.  相似文献   

5.
Normal or elevated selenium status of broilers, which is influenced by dietary selenium sources, improves the bird’s ability to overcome the adverse effects of reactive oxygen metabolites. The objective of this study was to evaluate the effects of feeding graded levels of peroxidized poultry fat on blood and hepatic glutathione peroxidase (GSH-Px), and hepatic glutathione reductase activity in broiler chickens fed either inorganic sodium selenite (SEL) or organic selenium enriched in the organic selenium yeast product Sel-Plex (SP). Nine starter diets, varying in levels of oxidized fat (0, 3, and 6 mEq/kg) and dietary selenium sources, were fed to 360 male chicks from hatch to 21 d of age. Sel-Plex or SEL was added to the basal diet to provide either 0 or 0.2 ppm of supplemental selenium in the diets. Blood and hepatic samples were obtained for each treatment group at 21 d of age. Neither peroxidized fat nor selenium source significantly altered the activity of hepatic glutathione reductase (P ≤ 0.05). Blood GSH-Px was influenced significantly by both fat and selenium source (P ≤ 0.05), but the fat × selenium source interaction was not significant (P ≥ 0.3). A selenium source effect on the hepatic GSH-Px activity (P ≤ 0.05) was evidenced by higher GSH-Px activity, even in the basal diet with no added peroxidized fat. An increase in GSH-Px activity was seen in the erythrocyte and hepatic samples in both the SEL and SP treatments when peroxidized fat was given at 3 mEq/kg, but in the erythrocytes and in the hepatic tissues from SEL-supplemented birds, there was an apparent inhibition of GSH-Px activity. This inhibition was not seen in the hepatic tissue samples from SP-fed birds. Because elevated GSH-Px activity is indicative of oxidative stress, it was concluded that dietary SP supplementation resulted in better selenium and redox status in broilers than did SEL. These results indicate that the dietary selenium supplied in an organic form (selenium yeast as SP) improved the selenium and redox status in broilers, leading to greater resistance to oxidative stress than when the inorganic form of selenium (SEL) was fed.  相似文献   

6.
试验旨在研究氧化应激对子代小鼠产生的影响。对亲代的公鼠和母鼠分别腹腔注射12.5 μg/g三硝基丙酸（3-NPA），分为正常公鼠与正常母鼠交配的对照组（C）、正常公鼠与3-NPA处理的母鼠交配组（FM）、正常母鼠与3-NPA处理的公鼠交配组（MM）、3-NPA处理的公鼠与3-NPA处理的母鼠交配组（DM）共4组，试验重复3次。通过剖出胎鼠的方法统计子代胎鼠的数量，采集子代胎鼠的心脏、肝脏、肺脏3个器官，测定超氧化物歧化酶（SOD）、过氧化氢酶（CAT）、谷胱甘肽过氧化物酶（GSH-PX）的活力及总抗氧化能力（T-AOC）。结果显示，与对照组相比，FM组胎鼠数量下降不明显（P>0.05），MM和DM组胎鼠数量均显著减少（P<0.05）；FM与DM组胎鼠肝脏、肺脏中CAT活力均显著增加（P<0.05）；MM组胎鼠肝脏、肺脏中CAT活力增加，但差异不显著（P>0.05）；各组心脏中CAT活力均增加，但差异均不显著（P>0.05）；除MM组肺脏中T-AOC活力增加差异不显著（P>0.05），其余各组肝脏、肺脏和心脏中T-AOC活力均显著增加（P<0.05）；DM组胎鼠肝脏中GSH-Px活力显著增加（P<0.05），FM和MM组胎鼠肝脏中GSH-Px活力增加，但差异不显著（P>0.05）；FM与DM组胎鼠肺脏中GSH-Px活力显著升高（P<0.05）；各组心脏中GSH-Px活力均差异不显著（P>0.05）；DM组胎鼠肝脏、肺脏、心脏中SOD活力均显著增加（P<0.05），FM和MM组胎鼠肝脏、肺脏、心脏中SOD活力增加，但差异均不显著（P>0.05）。因此，试验成功构建3-NPA氧化应激小鼠模型，且亲代雄性小鼠氧化应激对胎鼠影响较大。  相似文献   

7.
The loss of developmental competence and the glutathione (GSH) content of maternally heat‐stressed mouse oocytes and zygotes were determined. In experiment 1, zygotes were collected from female mice that were heat‐stressed at 35°C for 10 h after hCG injection (oocyte maturation stage), or for 12 h on Day 1 of pregnancy (zygote stage), followed by in vitro culture. To minimize the effects of heat stress on the fertilization process, heat‐stressed oocytes that were fertilized in vitro were also included in this experiment. In experiment 2, heat‐stressed oocytes and zygotes were assayed for GSH content. The application of heat stress to the oocytes resulted in a significant decrease in the percentage of zygotes that developed to morulae or blastocysts, both for naturally fertilized oocytes (56.9% for heat‐stressed vs 85.4% for control) or in vitro‐fertilized oocytes (54.5%vs 73.6%). In the heat‐stressed zygotes, the disruption of embryonic development was more drastic (24.3%vs 90.3%), with the majority of zygotes being arrested at the two‐cell stage. In contrast, the GSH content decreased significantly in heat‐stressed zygotes, but not in heat‐stressed oocytes. These results demonstrate that the loss of developmental competence of early embryos is associated with a decrease in the GSH content of maternally heat‐stressed zygotes, but not of maternally heat‐stressed oocytes.  相似文献   

8.
The aim of this study was to investigate the effects of feed withdrawal and darkening on the antioxidative status of laying hens in high ambient temperatures between 30-40 degrees C. We determined vitamins A and E, lipid peroxidation as thiobarbituric-acid reactive substances (TBARS), glutathione peroxidase (GSH-Px) and reduced glutathione (GSH) in the serum, liver and muscle. Sixteen week old hens (Ross Brown) were divided into 3 groups of 30 hens each. The first group was used as a control. Hens in the second (feed withdrawal) group were subjected to feed removal between 14-18 h during the summer. Hens in the third (darkening) group were subjected to darkening of the hens house with black curtains between 14-18 h. At the end of 16 weeks, blood serum, liver and breast muscle samples were taken from all animals and analysed. Vitamins A and E levels in serum and liver were significantly (P < 0.05, P < 0.01) higher in feed withdrawal and darkened groups than in control group whereas the serum levels of the darkening group were highest. GSH-Px activity and GSH level in liver and muscle were also significantly (P < 0.05, P < 0.01) higher in feed withdrawal and the darkening group than in control. However, TBARS levels in liver and muscle were significantly (P < 0.05, P < 0.01) lower in feed withdrawal and darkening groups compared with control group, whereas the level of the darkening group was the lowest. In conclusion, we observed that feed withdrawal and darkening of hens in high temperatures during summertime resulted in an increase of antioxidant enzymes and vitamins levels and in a decrease of lipid peroxidation.  相似文献   

9.
迷迭香酸对哮喘小鼠氧化性肺损伤的保护作用   总被引：1，自引：0，他引：1  
为评价迷迭香酸对哮喘小鼠模型氧化性肺损伤的保护作用,本研究用卵清蛋白（OVA）致敏、激发雌性BALB/c小鼠建立哮喘模型,并用OVA和H2O2联合激发小鼠作为氧化肺损伤阳性对照模型。在最后一次滴鼻激发24 h后,取支气管肺泡灌洗液（BALF）进行细胞计数并测定活性氧（ROS）、超氧化物歧化酶（SOD）和谷胱甘肽过氧化物酶（GSH-Px）水平,取左侧肺脏固定做HE染色。结果显示,迷迭香酸可明显减少BALF中细胞总数和嗜酸性粒细胞数目,显著抑制肺组织和BALF中ROS的产生,升高SOD和GSH-Px水平,改善肺组织病理变化。本试验结果表明,迷迭香酸对氧化肺损伤起到明显的保护作用。  相似文献   

10.
In order to evaluate the protective effect of rosmarinic acid on oxidative lung damage in asthmatic mice, in this study, the asthma model was established by sensitizing and challenging female BALB/c mice with ovalbumin (OVA), and some mice were challenged by OVA and H2O2 as a positive control of oxidative lung damage. The BALF, lung tissues of mice were harvested 24 h after the final OVA challenge and the number of total cells and eosinophils were measured, ROS,SOD and GSH-Px levels were detected, and pathological changes of lung tissue were observed using HE staining. The results showed that rosmarinic acid significantly reduced the number of total cells and eosinophils in BALF, significantly inhibited the production of ROS in lung tissue and BALF, increased the levels of SOD and GSH-Px, and ameliorated pathological changes of lung tissue. The results suggested that rosmarinic acid could protect oxidative lung damage in asthmatic mice.  相似文献   

11.
本试验旨在研究骆驼乳清蛋白（CWP）对热应激（HS）大鼠肝损伤、氧化应激及肝功能的保护作用。选取6周龄SD大鼠36只,适应性饲养2周后随机分为6组：正常对照组饲喂基础日粮;CWP对照组添加400 mg·kg-1的CWP;HS组除饲喂基础日粮外,每天进行2 h HS处理,连续8 d;3个CWP干预组分别于每次HS前灌服100、200和400 mg·kg-1的CWP。试验结束后,取大鼠肝组织,HE染色观察肝组织病理学变化,同时检测肝功能生物标志物、氧化应激标志物水平及抗氧化酶活性。结果表明：CWP降低了HS大鼠血清谷草转氨酶（AST）和谷丙转氨酶（ALT）活性,400 mg·kg-1的CWP干预效果最好（P<0.01）;400 mg·kg-1CWP干预组有效降低了HS诱导的大鼠肝组织病理学改变; CWP降低了大鼠肝活性氧（ROS）及丙二醛（MDA）水平,增加了超氧化物歧化酶（SOD）、过氧化氢酶（CAT）、谷胱甘肽过氧化物酶（GSH-Px）活性及谷胱甘肽（GSH）水平,400 mg·kg-1的CWP干预效果最好（P<0.01）。结果提示,CWP干预能够以剂量依赖性方式降低大鼠肝氧化应激,增加抗氧化系统防御能力,从而缓解HS所致大鼠肝损伤。  相似文献   

12.
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13.
The development of cleavage stage preimplantation embryos is disrupted by exposure to heat shock, such as high temperatures in the summer season. In this study, we investigated whether addition of anthocyanins, which are strong scavengers of reactive oxygen species (ROS), improves development and intracellular redox status of heat-exposed bovine preimplantation embryos by reduction of heat shock-derived oxidative stress. After in vitro fertilization (IVF), embryos were cultured at 38.5 C through Day 8 (Day 0=day of IVF) with 0, 0.1, 1 and 10 microg/ml anthocyanins (non-heat-shocked group). On Day 2, embryos were cultured at 41.5 C for 6 h with 0, 0.1, 1 and 10 microg/ml anthocyanins followed by culture at 38.5 C until Day 8 (HS group). After exposure to heat shock, the intracellular ROS and glutathione (GSH) contents of individual embryos were measured in the non-heat-shocked and HS groups using fluorescent probes. On Day 8, the blastocysts formation rates of the embryos and total cell numbers of blastocysts were evaluated. Embryos exposed to heat shock without anthocyanins showed a significant decrease in blastocyst formation rate and GSH content (P<0.05) and an increase in intracellular ROS (P<0.05) compared with non-heat-shocked embryos. In contrast, addition of 0.1 microg/ml anthocyanins significantly (P<0.05) improved the blastocyst formation rate of the heat-shocked embryos. Addition of any dose of anthocyanins produced a significant decrease in the ROS levels (P<0.05) and tended to increase the GSH levels under heat-shock conditions. However, addition of higher concentrations (1 and 10 microg/ml) of anthocyanins to the culture media under heat shock did not improve the development of embryos. These results indicate that anthocyanins maintain the intracellular redox balance of heat-shocked bovine embryos by reducing intracellular oxidative stress and increasing the GSH levels. Thus, alterations of the redox state using natural antioxidative polyphenols is a useful approach for reducing heat shock-derived oxidative stress.  相似文献   

14.
本试验旨在研究银杏叶提取物（Ginko biloba extract,GBE）对热应激致鸡心肌细胞氧化损伤的保护作用。取12日龄AA肉鸡心脏制备鸡原代心肌细胞,向原代心肌细胞培养板中分别加入0、5、10、50、100、150 mg/mL GBE,CCK-8试剂盒检测心肌细胞存活率;将原代心肌细胞以1×104个/孔接种于96孔板,培养48 h,分别加入0、5、10、50、100、200、500、1 000 μg/mL GBE,Hoechst 33258检测心肌细胞凋亡率,确定最适GBE浓度。42℃热应激处理（0、0.5、1、2和4 h）建立心肌细胞损伤模型,ELISA试剂盒检测乳酸脱氢酶（LDH）、细胞丙二醛（MDA）和谷胱甘肽过氧化物酶（GSH-Px）含量,以及超氧化物歧化酶（SOD）活性;Western blotting检测Hsp72蛋白表达。结果显示,高浓度GBE具有细胞毒性,50、100、150 mg/mL GBE能极显著抑制细胞生长（P<0.01）,50 μg/mL GBE能够极显著提高细胞增殖率（P<0.01）。热应激后细胞发生凋亡,细胞内MDA、LDH含量增加,SOD活性、GSH-Px含量减少,产生氧化损伤;GBE可以降低热应激时细胞LDH和MDA的含量,增加SOD活性和GSH-Px的含量,热应激2、4 h,GBE处理效果明显。此外,GBE可增加心肌细胞中Hsp72蛋白的表达。综上所述,GBE能降低热应激状态下心肌细胞的氧化损伤,其机制可能与提高抗氧化酶活性及提高Hsp72的表达有关。  相似文献   

15.
Heat shock is known to increase the mortality of early stage embryos, but the exact mechanism is unclear. In the present study, we investigated the possibility that the increased mortality is caused by heat shock-generated reactive oxygen species (ROS). The level of ROS was controlled by using beta-mercaptoethanol (beta-ME), a scavenger of ROS. In vitro-produced 8-cell stage embryos were cultured at 38.5 C or heat-shocked by exposure to 41 C for 6 h with 0, 10 and 50 microM beta-ME. Intracellular ROS levels were measured by a fluorescent dye, 2',7'-dichlorodihydrofluorescein diacetate (DCHFDA), and intracellular reduced form of glutathione (GSH) contents were estimated by another fluorescent dye, 4-chloromethyl-6,8-difluoro-7-hydroxycoumarin. Total glutathione content was estimated by the glutathione recycling assay. On day 8 after insemination, heat shock decreased the percentage of embryos that developed to the blastocyst stage and increased intracellular ROS levels, but there was no significant effect on the GSH and total glutathione contents. In contrast, beta-ME significantly decreased ROS levels in heat-shocked embryos and increased the GSH and total glutathione concentrations. Ten microM beta-ME significantly improved the viability of heat-shocked embryos. beta-ME caused no detrimental effects when it was added at normal culture temperature (38.5 C). These results indicate that ROS is the primary cause of increased embryonic mortality in heat-shocked early stage embryos.  相似文献   

16.
本试验旨在研究乐果(Dimethoate)对大鼠的毒性作用,探讨乐果中毒的氧化应激机制.将24只SD大鼠分成对照组和3个染毒组,分别以0、1、6、30 mg/kg体质量剂量灌服乐果,连续灌服30 d后,测定血浆和肝脏胆碱酯酶(ChE)活性及肝脏中超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)、过氧化氢酶(CAT)活性和丙二醛(MDA)含量,并观察肝脏组织学和超微结构变化.结果显示,乐果染毒后大鼠血浆和肝脏ChE活性均极显著降低(P<0.01);大鼠肝脏SOD活性呈上升趋势,而GSH-Px、CAT活性随染毒剂量增加呈先下降后上升趋势;各染毒组肝脏MDA含量均呈上升趋势;组织学和超微结构检查显示肝细胞脂肪变性、凋亡等.结果表明.大鼠乐果持续染毒可以诱导机体脂质过氧化增强,并导致肝脏结构损伤,说明氧化应激在乐果的肝脏毒性中发挥重要作用.  相似文献   

17.
The aim of this study was to determine oxidative stress parameters in the liver, gill and muscle of silver catfish juveniles infected with Ichthyophthirius multifiliis and maintained at pH 5.0 or 7.0 for three days. Juveniles were infected by adding one I. multifiliis-infected juvenile and water containing theronts to tanks. After the appearance of white spots on the skin, infected juveniles exposed to pH 5.0 and 7.0 showed significantly higher thiobarbituric acid reactive substances (TBARS) levels in the liver and gills compared to uninfected juveniles. Liver of infected juveniles exposed to pH 7.0 showed higher catalase (CAT) and lower glutathione-S-transferase (GST) activities, but those maintained at pH 5.0 showed significantly higher GST activity than uninfected juveniles. The gills of infected juveniles showed significantly higher CAT (day two) and GST activity at both pH 5.0 and 7.0 compared to uninfected juveniles. Muscle of infected juveniles showed significantly lower CAT and GST activity and TBARS levels (at day three) when maintained at both pH 5.0 and 7.0 compared to uninfected juveniles. In conclusion, I. multifiliis infection induces liver and gill damage via lipid peroxidation products in silver catfish, but higher antioxidant enzyme activity could indicate a greater degree of protection against this parasite.  相似文献   

18.
This study was part of a larger study that addressed whether milk production levels affect health risks in dairy cows as influenced by genetic merit for milk yield and management factors. Plasma samples were collected from 80 Holstein Friesian heifers at 2 weeks pre-partum and at 4 and 8 weeks post-partum in a 2 × 2 × 2 factorial arrangement design with the factors breeding value for milk production (high or low), milking frequency (2 or 3 times a day) and feed energy density (high or low). The following parameters indicative of the oxidative status were measured in plasma: ferric reducing ability of plasma (FRAP), α-tocopherol level, glutathione peroxidase activity (GSH-Px), superoxide dismutase activity (SOD), thiobarbituric acid reactive substances (TBARS) concentration and paraoxonase activity (PON). There was a significant effect of time for FRAP, α-tocopherol, GSH-Px and SOD, indicating changes in the plasma oxidative status around parturition. A high merit for milk yield, three-times-daily milking and especially feeding the high energy feed all stimulated milk production level. However, the influence on oxidative status parameters was minimal. Only the FRAP value was significantly lower in the high compared to the low energy group. Cows seem to undergo some oxidative stress around parturition, which can make them more susceptible to disorders. However, there were no clear indications that breeding value, milk frequency or feed energy level jeopardizes heifers in a way oxidative stress became critical.  相似文献   

19.
【目的】 探究绞股蓝多糖(Gynostemma pentaphyllum polysaccharides, GPP)对D-半乳糖(D-galactose, D-gal)致衰老小鼠肝脏抗氧化能力的影响。【方法】 60只4周龄SPF级昆明小鼠随机分为6组(雌雄各半): 空白对照组(Control)、模型组(D-gal)、阳性对照组(Vc)及绞股蓝多糖低(50 mg/kg)、中(100 mg/kg)、高(200 mg/kg)剂量组(GPP-L、GPP-M和GPP-H), 每组10只。采用生物化学、酶联免疫吸附及组织学技术等方法分别对各试验组小鼠的体重及增重变化、肝脏指数、血清总抗氧化能力(T-AOC)水平、肝脏超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)和过氧化氢酶(CAT)活性、活性氧(ROS)、丙二醛(MDA)含量及肝脏组织形态和肝索面积比进行测定分析。【结果】 各组小鼠体重均呈增长趋势, 增重均呈下降趋势, 其中GPP-M组小鼠体重低于其他各组, 增重最少; GPP各剂量组肝脏指数、血清T-AOC水平均高于D-gal组; GPP各剂量组的小鼠肝脏组织SOD水平与D-gal组相比均无显著差异(P>0.05)。GSH-Px、CAT活性水平与D-gal组相比均有所增强, 其中GPP-M组小鼠肝脏中GSH-Px活性显著高于D-gal组(P<0.05);GPP-L组小鼠肝脏中CAT活性显著高于D-gal组(P < 0.05), ROS、MDA含量均显著低于D-gal组(P<0.05)。HE染色发现, D-gal组胞浆嗜酸性增强, 肝细胞之间连接松散, 肝血窦扩张明显, 而GPP各组肝脏组织结构均有所改善, GPP-M与GPP-H组改善较明显; GPP-H组肝脏肝索面积占比与空白对照组和阳性对照组相当, GPP-M和GPP-H组肝脏肝索面积占比与GPP-L组相比显著增加(P<0.05)。【结论】 GPP可以有效提高D-gal致衰老小鼠肝脏的抗氧化能力, 从而达到延缓衰老的作用, 其中GPP-M(100 mg/kg)组对D-gal致衰老小鼠肝脏抗氧化效果明显。  相似文献   

20.
本试验旨研究在体外培养（in vitro culture，IVC）中添加芝麻素（sesamin，SES）对小鼠早期胚胎体外发育的影响。采集6周龄雌性昆明小鼠受精卵，随机分为对照组和不同浓度（10、50、100 μmol/L）SES组。采用Fluorescein-dUTP和Hoechst 33342免疫荧光染色分别检测囊胚内细胞凋亡率和总细胞数；采用DCFH-DA检测早期胚胎内活性氧（reactive oxygen species，ROS）水平；采用CMF2HC检测早期胚胎内谷胱甘肽（glutathione，GSH）水平；采用JC-1检测早期胚胎线粒体膜电位强度。结果显示，不同浓度SES组分裂率和囊胚率较对照组均有提高，但无显著差异（P>0.05）；50 μmol/L SES组细胞数较对照组显著提高（P<0.05），细胞凋亡率较对照组显著降低（P<0.05）；与对照组相比，50 μmol/L SES组ROS水平显著降低（P<0.05），GSH水平和线粒体膜电位水平显著提高（P<0.05）。结果表明，在IVC中添加SES可提高囊胚内细胞数、减少细胞凋亡率，降低细胞内ROS水平，提高细胞内GSH水平，改善早期胚胎线粒体功能，减少胚胎氧化应激的损伤，提高小鼠早期胚胎发育质量。  相似文献   

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