首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献，搜索用时 31 毫秒
1.
The hepatoprotective potential of earthworm extract (EE) (Lampito mauritii, Kinberg) was evaluated against paracetamol-induced liver injury in Wistar albino rat, in comparison with silymarin, the standard hepatoprotective drug. We observed a reduction in liver antioxidants, such as glutathione (GSH), superoxide dismutase (SOD), glutathione peroxidase (GPx),and catalase (CAT) and in serum total protein, and an increase in serum alkaline phosphatase (ALP), serum aspertate aminotranferase (AST), serum alanine aminotranferase (ALT), bilirubin and liver thiobarbituric acid reactive substances (TBARS) due to liver injury in the paracetamol-administered rats (2 g/kg). On the contrary, increased activities of liver GSH, SOD, GPx,CAT and serum total protein level, and decrease in the contents of serum ALP, AST, ALT, bilirubin and liver TBARS were observed in rats administered with different doses of EE (100, 200 and 300 mg/kg), which are similar to the activities of hepatoprotective drug silymarin (150 mg/kg). The mode of action of EE as evidenced by the above parameters may suggest that EE, on the one hand, prevents the formation of the reactive oxygen groups, or scavenges these groups, thereby preventing the damage on the hepatic cells, and, on the other hand, modulates the genes responsible for synthesis of antioxidant enzymes such as GPx, CAT and SOD in liver tissue and decreases the serum enzymatic activities such as ALP, AST and ALT.  相似文献   

2.
海藻多糖抗氧化作用的实验研究   总被引：1，自引：0，他引：1  
黄朋纳  黄清松 《宜春学院学报》2012,34(4):106-107,119
目的:研究海藻多糖(Polysaechrides from Spirulina Platensis,PSP)对小鼠肝损伤动物模型与肝匀浆脂质过氧化模型的抗氧化作用。方法:采用腹腔注射CCL4的方法,制造小鼠肝损伤动物模型,金氏法测定血清谷氨酸丙酮酸转氨酶(SGPT)和肝脏的过氧化脂质(Lipoper-oxides,LPO)含量;Fenton反应诱导小鼠肝匀浆脂质过氧化动物模型,采用硫代巴比妥酸(TBA)法测定肝匀浆LPO。结果:在体外,海藻多糖可剂量依赖性地抑制Fenton反应导致的CCL4毒化小鼠肝匀浆中LPO的生成,其IC50为1.6×10-4。在体内,灌胃250mg/kg的海藻多糖组可明显降低CCL4毒化小鼠血清SGPT活性(P<0.01)。结论:海藻多糖对体内外的肝组织有一定程度的抗氧化作用。  相似文献   

3.
姜黄素对小鼠抗氧化酶活性及NO含量的影响   总被引：4，自引：0，他引：4  
选取60只小鼠,随机分成四组(A、B、C、D),A组为对照组,饲喂基础饲料;B、C、D组分别在基础饲料中添加0.02%、0.04%、0.06%的姜黄素.正常饲养15d后,屠宰测定小鼠血清、肝脏、心脏、脑组织中超氧化物歧化酶(SOD)、过氧化氢酶(CAT)的活性及丙二醛(MDA)、NO的含量.结果表明,小鼠采食添加姜黄素的饲料后,体内抗氧化酶SOD、CAT活性升高,MDA、NO含量下降.  相似文献   

4.
经NIH小鼠急性毒性实验测定结果表明,贡品健身酒最大耐受量为270ml/kg.贡品健身酒5,10,20ml/kg给动物灌胃,可降低小鼠脑、心、肝脂质过氧化产物丙二醛含量;10,20m1/kg剂量组,可增加小鼠血清溶血素含量,延长小鼠爬杆时间和负荷游泳时间,对戊巴比妥钠诱导的小鼠入睡时间可显著延长;对大鼠血清总胆固醇含量可显著降低.体外实验还证明贡品健身酒具抗肿瘤作用,实验结果提示。贡品健身酒具明显的保健功效.  相似文献   

5.
Background and objective: Gonadotropin-releasing hormone (GnRH) plays an important role in the regulation of ovarian function and ovarian cancer cell growth. In this study, we determined whether administration of the GnRH agonist (GnRHa), triporelin, prior to cisplatin treatment affects cisplatin and/or prevents cisplatin-induced ovarian damage. Methods: nu/nu mice were injected with ovarian cancer OVCAR-3 cells intraperitoneally. After two weeks, the mice were treated with saline (control), cisplatin, GnRHa, or cisplatin plus GnRHa for four weeks. At the end of the experimental protocol, blood, tumor, ovary, and uterine tissues were resected for hematoxylin and eosin (H&E) staining, immunohistochemical analyses of Ki67, nuclear factor-κB (NF-κB), and caspase-3, transmission electron microscopy of apoptosis, or enzyme-linked immunosorbent assay (ELISA) analyses of anti-Mullerian hormone (AMH). Results: Cisplatin treatment effectively inhibited tumor growth in mice treated with human ovarian cancer cells; however the treatment also induced considerable toxicity. Immunohistochemical analyses showed that Ki67 expression was reduced in cisplatin-treated mice compared to control (P<0.05), but there was no statistically significant differences between cisplatin-treated mice and cisplatin plus GnRHa-treated mice (P>0.05), while expressions of NF-κB and caspase-3 were reduced and induced, respectively, in cisplatin-treated mice and cisplatin plus GnRHa-treated mice. Apoptosis occurred in the GnRHa, cisplatin, and cisplatin plus GnRHa-treated mice, but not in control mice. Ovaries exposed to GnRHa in both GnRHa mice and cisplatin-treated mice (combination group) had significantly more primordial and growth follicles and serum levels of AMH than those in the control mice and cisplatin-treated mice (P<0.05). Conclusions: Administration of GnRHa to mice significantly decreased the extent of ovarian damage induced by cisplatin, but did not affect the anti-tumor activity of cisplatin.  相似文献   

6.
目的:观察黄芩甙注射液对四氯化碳(CCl4)致急性肝损伤小鼠肝抗氧化功能的影响。方法:50只小鼠随机分为5组,每组10只,分别为对照组、模型组、黄芩甙注射液低、中、高(0.25 g/kg、0.50 g/kg、1.00g/kg)剂量组。用CCl4制备小鼠急性肝损伤模型,测定小鼠体重变化,肝指数,肝超氧化物歧化酶(SOD)及谷胱甘肽过氧化物酶(GSH-Px)活性,谷胱甘肽(GSH)及丙二醛(MDA)含量。结果:与对照组及模型组比较,黄芩甙各剂量组小鼠试验前后的体重及肝指数差异不显著(P>0.05)。与模型组比较,低剂量组小鼠肝SOD、GSH-Px活性及MDA含量差异不显著(P>0.05),而GSH含量显著升高(P<0.05);中、高剂量组SOD、GSH-Px活性极显著提高(P<0.01),GSH含量极显著升高(P<0.01),MDA含量极显著降低(P<0.01)。结论:黄芩甙能显著增强急性肝损伤小鼠肝SOD、GSH-Px活性,提高GSH含量,降低MDA含量,并表现正向的量效关系。  相似文献   

7.
目的：研究大黄素对脑缺血-再灌注小鼠探索认知功能的改善作用及其机制。方法：采用改进的Himori法暂时性阻断两侧颈总动脉制备小鼠脑缺血-再灌注损伤模型,进行探索实验和跳台实验,观察腹腔注射大黄素10.0、1.0、0.1 mg·kg-1对脑缺血-再灌注小鼠探索认知功能的改善作用,并对各剂量组小鼠脑组织和血液中一氧化氮（nitric oxide,NO）含量和一氧化氮合酶（nitric oxide synthase,NOS）活力、脑组织中过氧化氢（hydrogen peroxide,H2O2）含量和过氧化氢酶（catalase,CAT）活力进行测定,并测定脑指数。结果：大黄素可改善脑缺血-再灌注损伤所致的探索认知功能障碍;减少NO和H2O2含量,降低NOS活力,提高CAT活力和增加脑指数。结论：大黄素对脑缺血-再灌注损伤小鼠探索认知功能有改善作用,其作用机制可能是通过降低NOS活力和增强CAT活力,提高脑组织对氧自由基的清除能力,从而减轻缺血-再灌注引起的脑组织损伤。  相似文献   

8.
Background/aim： Currently, the liver is cold-preserved at 0-4 ℃ for experimental and clinical purposes. Here, we investigated whether milder hypothermia during the initial phase of the preservation period was beneficial for liver viability upon reperfusion. Methods： In the first set of experiments, rat livers were preserved either conventionally in clinically used histidine-trypthopan-ketoglutarate （HTK） solution （Group A： 45 min and Group B： 24 h） or by slow cooling HTK solution （from 13 ℃ to 3 ℃） during the initial 45 min of preservation （Group C： 24 h）. In the second set of experiments, additional groups of livers were evaluated： Group BB-preservation according to Group B and Group CC-preservation according to Group C. Further, some livers were preserved at 13 ℃ for 24 h. Livers were then reperfused using a blood-free perfusion model. Results： Bile production was approximately 2-fold greater in Group C compared to Group B. Alanine transaminase （ALT） and aspartate transaminase （AST） release into perfusate were 2-3-fold higher in Group B compared to Group C. No significant differences were found in ALT and AST release between Group C and Group A. Livers in Group CC compared to Group BB exhibited significantly lower portal resistance, greater oxygen consumption and bromosulfophthalein excretion into bile and lower lactate dehydrogenase （LDH） release into perfusate. Histological evaluation of tissue sections in Group BB showed parenchymal dystrophy of hepatocytes, while dystrophy ofhepatocytes was absent in Group CC. Livers preserved at 13 ℃ for 24 h exhibited severe ischemic injury Conclusion： These results suggest that the conventional way of liver preservation is not suitable at least for rat livers and that slow cooling of HTK solution during the initial phase of cold storage can improve liver viability during reperfusion.  相似文献   

9.
目的：探讨前期研究筛选出的丹参七种水溶性有效成分最优配伍组合样品A2、B4、C11对脑缺血再灌注（ischemia reperfusion）小鼠学习记忆的保护作用。方法：采用改进的Himori法暂时性阻断两侧颈总动脉制备小鼠脑缺血再灌注损伤模型,应用水迷宫实验,观察配伍组合样品对脑缺血再灌注小鼠记忆功能的保护作用,检测小鼠断头耐缺氧存活时间,脑组织中超氧化物歧化酶（superoxi dedismutase,SOD）、过氧化氢酶（catalase,CAT）、乙酰胆碱酯酶（aeetyleholine esterase,ACHE）活力及丙二醛（malondialdehyde,MDA）含量。免疫组织化学方法检测小鼠海马神经元凋亡相关天冬氨酸特异性半胱氨酸蛋白酶-3（cysteine-asparate protease-3,caspase-3）和神经生长因子（nerve growth factor,NGF）的表达。结果：丹参7种水溶性有效成分配伍组合样品B4、C1l可明显改善小鼠脑缺血再灌注所致的记忆障碍,增强耐缺氧能力,提高脑内SOD,CAT活性,降低AChE活性和MDA含量;抑制凋亡蛋白caspase．3表达,上调NGF表达。其中以B4（2．8μm01·L-1）、C11（30．0iμmol·L-1）组作用最为明显（P〈0．01）,A2各个剂量组效果不显著（P〉0．05）。结论：丹参7种水溶性有效成分配伍组合样品B4、C11对脑缺血再灌注损伤小鼠记忆功能有保护作用,其机制可能通过提高清除脑内自由基能力,抑制小鼠神经细胞凋亡,促进神经再生,来减轻脑缺血再灌注引起的脑组织损伤。  相似文献   

10.
凝胶过滤及离子交换层折法纯化玉米CuZn—SOD的研究   总被引：4，自引：0，他引：4  
用葡聚糖（Sephadex G－75）凝胶过滤及纤维素（DEAE－32）离子交换层析法分离纯化玉米CuZn－SOD,并对其部分理化性质进行了测定。结果表明，玉米CuZn－SOD具有怀其它来源的CuZn－SOD相似的性质，即最大吸收峰为260nm，分子量为33，600道尔顿，分子中含有17种289个氨基酸残基，不含色氨酸，N－末端氨基酸为丙氨酸，1分子酶中含2个铜原子和2个锌原子；电泳分析显示，蛋白质谱带和酶活性谱带数目相同，均为两条。  相似文献   

11.
Orthotopic liver transplantation (OLT) is the only proven effective treatment for both end-stage and metabolic liver diseases. Hepatocyte transplantation is a promising alternative for OLT, but the lack of available donor livers has hampered its clinical application. Hepatocyte-like cells (HLCs) differentiated from many multi-potential stem cells can help repair damaged liver tissue. Yet almost suitable cells currently identified for human use are difficult to harvest and involve invasive procedures. Recently, a novel mesenchymal stem cell derived from human menstrual blood (MenSC) has been discovered and obtained easily and repeatedly. In this study, we examined whether the MenSCs are able to differentiate into functional HLCs in vitro. After three weeks of incubation in hepatogenic differentiation medium containing hepatocyte growth factor (HGF), fibroblast growth factor-4 (FGF-4), and oncostain M (OSM), cuboidal HLCs were observed, and cells also expressed hepatocyte-specific marker genes including albumin (ALB), α-fetoprotein (AFP), cytokeratin 18/19 (CK18/19), and cytochrome P450 1A1/3A4 (CYP1A1/3A4). Differentiated cells further demonstrated in vitro mature hepatocyte functions such as urea synthesis, glycogen storage, and indocyanine green (ICG) uptake. After intrasplenic transplantation into mice with 2/3 partial hepatectomy, the MenSC-derived HLCs were detected in recipient livers and expressed human ALB protein. We also showed that MenSC-derived HLC transplantation could restore the serum ALB level and significantly suppressed transaminase activity of liver injury animals. In conclusion, MenSCs may serve as an ideal, easily accessible source of material for tissue engineering and cell therapy of liver tissues.  相似文献   

12.
目的：：观察三叶悬钩子乙醇提取物对大鼠酒精性肝炎的保护作用。方法：90只大鼠,随机分为6组,每天上午8：00灌胃1次,正常组大鼠灌胃给蒸馏水,其余5组大鼠灌胃给白酒,连续灌胃28 d,建立大鼠酒精性肝炎模型;第15天开始,每天上午9：00各组大鼠均以相应药物灌胃1次,连续灌胃14 d;第28天末次灌胃后,取血、取肝脏,检测血清天门冬氨酸氨基转移酶（GOT）、丙氨酸氨基转移酶（GPT）活性及肝组织丙二醛（MDA）含量、超氧化物歧化酶（SOD）活性;观察肝脏指数及肝组织病理变化。结果：三叶悬钩子乙醇提取物能显著降低肝炎大鼠GPT、GOT活性和MDA含量,能显著提高肝炎大鼠SOD活性;能显著降低肝炎大鼠肝脏指数;能显著减轻肝炎大鼠肝组织水肿和脂肪变性。结论：三叶悬钩子对大鼠酒精性肝炎有保护作用。  相似文献   

13.
研究了不同浓度的镉（Cd2＋）对背角无齿蚌（Anodonta woodiana woodiana）肝脏和肌肉过氧化氢酶（CAT）活性的影响.结果表明：在Cd2＋浓度低于0.7 mg·L-1时对肌肉CAT活性起诱导作用,在Cd2＋浓度低于0.5 mg·L-1时对肝脏CAT活性起诱导作用,最大值出现在0.2 mg·L-1附近;而高浓度Cd2＋（高于0.8 mg·L-1）对CAT起抑制作用.灵敏度结果显示,低浓度Cd2＋胁迫下（0.1 mg·L-1）,肝脏CAT的诱导倍数高于肌肉.背角无齿蚌肝脏CAT对水环境中的重金属反应敏感,对重金属的早期污染有指示作用.  相似文献   

14.
肉鸡肺动脉高压肝脏和心脏线粒体氧自由基变化研究   总被引：6，自引：0，他引：6  
400只艾维茵肉鸡按常规方法育雏在21日龄时随机分为两组,A组200只在24℃下饲养,B组200只在低温12℃下饲养。在28、35、42、49日龄测定腹水心脏指数和红细胞压积,分离鉴定腹水肉鸡心、肝线粒体,测定其所含的MnSOD活性以及线粒体膜结构的MDA含量变化经。结果表明:(1)低温处理后一周和二周,在肝脏和心脏线粒体中,SOD含量升高或显著升高(p<0.05)。MDA含量降低或显著降低(p<0.05)。(2)低温处理三周后,SOD的含量降低或显著降低。MDA的含量升高或显著升高(p<0.05)。本实验结果显示肝脏和心脏的线粒体SOD和MDA的变化与肉鸡腹水综合征的发生发展关系密切,氧自由基在亚细胞水平上参与了疾病的病理过程。  相似文献   

15.
Salvianolic acid B(Sal B) is an active component of traditional Chinese medicine Salvia miltiorrhiza and is used to treat vascular diseases. To better understand its mechanism, the antioxidant capacities of Sal B was evaluated with human endothelial cells under oxidative stress. Human endothelial cells were pretreated with Sal B for 12 h followed by hydrogen peroxide for another 12 h. Production of reactive oxygen species (ROS), activities of superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPX), and concentration of glu-tathione were measured: Protective effect of Sal B on the endothelial cells from hydrogen peroxide-induced damage ' was observed, and ROS production in the cells was found significantly inhibited. Sal B remarkably enhanced the activities of antioxidant enzymes SOD, CAT and GPX. Furthermore, Sal B up-regulated the intracellular glutathione concentration. The results indicate that Sal B protected endothelial cells from oxidative stress by improving the redox status of the cells through enhancing the antioxidant enzyme activities and increasing the reductive glutathione concentration after the oxidative challenge.  相似文献   

16.
  相似文献   

17.
Chlorogenic acid (CGA), a polyphenolic compound, is abundant in fruits, dietary vegetables, and some medicinal herbs. This study investigated the prevention of CGA against acetaminophen (AP)-induced hepatotoxicity and its engaged mechanisms. CGA reversed the decreased cell viability induced by AP in L-02 cells in vitro. In addition, CGA reduced the AP-induced increased serum levels of alanine/aspartate aminotransferase (ALT/AST) in vivo. The effect of CGA on cytochrome P450 (CYP) enzymatic (CYP2E1, CYP1A2, and CYP3A4) activities showed that CGA caused very little inhibition on CYP2E1 and CYP1A2 enzymatic activities, but not CYP3A4. The measurement of liver malondialdehyde (MDA), reactive oxygen species (ROS), and glutathione (GSH) levels showed that CGA prevented AP-induced liver oxidative stress injury. Further, CGA increased the AP-induced decreased mRNA expression of peroxiredoxin (Prx) 1, 2, 3, 5, 6, epoxide hydrolase (Ephx) 2, and polymerase (RNA) II (DNA directed) polypeptide K (Polr2k), and nuclear factor erythroid-2-related factor 2 (Nrf2). In summary, CGA ameliorates the AP-induced liver injury probably by slightly inhibiting CYP2E1 and CYP1A2 enzymatic properties. In addition, cellular important antioxidant signals such as Prx1, 2, 3, 5, 6, Ephx2, Polr2k, and Nrf2 also contributed to the protection of CGA against AP-induced oxidative stress injury.  相似文献   

18.
采用急性毒性实验方法,研究了不同浓度的镉离子（Cd2＋）和汞离子（Hg2＋）单一及复合染毒对田螺肝胰脏过氧化氢酶（CAT）活性的影响.结果表明：在实验剂量范围（ρCd2＋0.5～8.0mg/L,ρHg2＋0.05～0.8mg/L）,单一染毒时,低浓度的Cd2＋,Hg2＋溶液对CAT活性有诱导作用;高浓度的Cd2＋,Hg2＋溶液有抑制作用.Cd2＋,Hg2＋复合染毒时,低、中浓度的镉与汞复合染毒,对CAT活性具有诱导作用,高浓度的镉与汞复合染毒,对CAT活性具有抑制作用.表明了在不同浓度Cd2＋,Hg2＋及联合作用的胁迫下,一定时间后CAT活性出现了较为显著的变化,从而为探讨重金属Cd2＋、Hg2＋对田螺的毒理作用及根据田螺肝胰脏CAT活性的变化可作为间接检测环境的污染程度的指标.  相似文献   

19.
Objective: To determine the effects of albumin administration on lung injury and apoptosis in traumatic/hemorrhagic shock (T/HS) rats. Methods: Studies were performed on an in vivo model of spontaneously breathing rats with induced T/HS; the rats were subjected to femur fracture, ischemia for 30 min, and reperfusion for 20 min with Ringer’s lactate solution (RS) or 5% (w/v) albumin (ALB), and the left lower lobes of the lungs were resected. Results: Albumin administered during reperfusion markedly attenuate...  相似文献   

20.
Background and objective: Liver regeneration is a complex process regulated by a group of genetic and epigenetic factors. A variety of genetic factors have been reported, whereas few investigations have focused on epigenetic regulation during liver regeneration. In the present study, valproic acid (VPA), a histone deacetylase (HDAC) inhibitor, was used to investigate the effect of HDAC on liver regeneration. Methods: VPA was administered via intraperitoneal injection to 2/3 partially hepatectomized mice to detect hepatocyte proliferation during liver regeneration. The mice were sacrificed, and their liver tissues were harvested at sequential time points from 0 to 168 h after treatment. DNA synthesis was detected via a BrdU assay, and cell proliferation was tested using Ki-67. The expressions of cyclin D1, cyclin E, cyclin dependent kinase 2 (CDK2), and CDK4 were detected by Western blot analysis. Chromatin immunoprecipitation (ChIP) assay was used to examine the recruitment of HDACs to the target promoter regions and the expression of the target gene was detected by Western blot. Results: Immunohistochemical analysis showed that cells positive for BrdU and Ki-67 decreased, and the peak of BrdU was delayed in the VPA-administered mice. Consistently, cyclin D1 expression was also delayed. We identified B-myc as a target gene of HDACs by complementary DNA (cDNA) microarray. The expression of B-myc increased in the VPA-administered mice after hepatectomy (PH). The ChIP assay confirmed the presence of HDACs at the B-myc promoter. Conclusions: HDAC activities are essential for liver regeneration. Inhibiting HDAC activities delays liver regeneration and induces liver cell cycle arrest, thereby causing an anti-proliferative effect on liver regeneration.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号