共查询到20条相似文献，搜索用时 31 毫秒
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氟对牛脾淋巴细胞内抗氧化功能和NO代谢的影响 总被引：2，自引：2，他引：0
采用常规方法分离培养健康牛脾脏淋巴细胞,用不同浓度氟化钠（NaF）染毒24 h。检测牛脾淋巴细胞内谷胱甘肽过氧化物酶（GSH-Px）、超氧化物歧化酶（SOD）、一氧化氮合酶(NOS)活性及丙二醛（MDA）和一氧化氮（NO）的含量。结果表明,与对照组相比,淋巴细胞内GSH-Px、SOD活性不同程度的降低,而其余各指标均不同程度的升高,且存在着剂量效应关系。由此得出,氟能够导致体外培养牛脾淋巴细胞内抗氧化功能下降,脂质过氧化程度加重,自由基含量增多,对淋巴细胞造成损伤。 相似文献
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Treatment of Brucella melitensis infection in mice by use of liposome-encapsulated gentamicin 总被引：1，自引：0，他引：1
T Hernández-Caselles A Vera F Crespo J Villalaín J C Gómez-Fernández 《American journal of veterinary research》1989,50(9):1486-1488
Liposomes with entrapped gentamicin were used to treat mice with infection attributable to Brucella melitensis. Liposomes bearing positive charge and formed by egg yolk lecithin, cholesterol, and stearylamine were effective in the elimination of B melitensis residing in liver and spleen. Negatively charged liposomes, formed by egg yolk lecithin, cholesterol, and dicetyl phosphate were also effective in suppression of the infection in liver, but were less so in suppression of the infection in the spleen. Free gentamicin was less effective than the encapsulated antibiotic. At 20 hours after administration of gentamicin encapsulated in liposomes, the gentamicin concentrations in liver and spleen were similar, regardless of the charge of the liposomes--neutral, positive, or negative. However, positively charged liposomes were more efficient than were other liposome types for the treatment of brucellosis caused by B melitensis. 相似文献
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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
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L M Ribeiro S Herr F Chaparro F H van der Vyver 《The Onderstepoort journal of veterinary research》1990,57(2):143-144
Brucella melitensis biotype 1 was isolated in pure culture from the lungs, liver, spleen, kidney, stomach contents, abomasum and brain of an aborted caprine (Boer goat) foetus in the district of Cullinan near Pretoria. The 18 does and 1 ram in the flock of Boer goates were examined serologically by means of the complement fixation (CF) test, using Brucella abortus antigen. Six weeks later they were examined again, using B. abortus as well as B. melitensis biotype 1 antigens. No significant differences were found between the 2 CF tests using B. abortus antigen, or between the results obtained by using the B. abortus and B. melitensis antigens. Twelve goats, showing CF antibody titres, were slaughtered and examined bacteriologically. No relationship was found between the serological and bacteriological results. 相似文献
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本试验旨在研究布鲁菌侵染小鼠过程中一氧化氮(NO)的作用,以及NO和非对称性二甲基精氨酸(ADMA)在此过程的相互作用关系。以布鲁菌标准疫苗株M5侵染小鼠,首先用小鼠的血清进行虎红平板凝集(RBPT)和试管凝集试验(SAT),再用Griess试剂法和ELISA法测定对照组和侵染组不同组织和血清中的NO和ADMA含量,对小鼠肝脏和脾脏的各个侵染时间段进行CFU计数观察。结果显示,用布鲁菌M5侵染小鼠后,RBPT和SAT在14d时检测到有阳性反应。侵染组和空白对照组NO总含量上变化不大,但侵染组血清中的NO含量随时间出现下降,而肝脾中NO含量随时间出现上升,其他各组织NO含量波动不明显。而ADMA的总趋势与NO相反。CFU计数结果显示,小鼠肝脾内布鲁菌的数量在14d时一直处于增长状态,28d时布鲁菌的数量下降,表明布鲁菌的分裂繁殖和机体NO的含量存在一定的关系。 相似文献
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Short‐term effects of T‐2 toxin exposure on some lipid peroxide and glutathione redox parameters of broiler chickens 
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下载免费PDF全文 A. Bócsai Cs. Pelyhe E. Zándoki Zs. Ancsin J. Szabó‐Fodor M. Erdélyi M. Mézes K. Balogh 《Journal of animal physiology and animal nutrition》2016,100(3):520-525
The purpose of this study was to investigate the short‐term effects of T‐2 toxin exposure (3.09 mg/kg feed) on lipid peroxidation and glutathione redox system of broiler chicken. A total of 54 Cobb 500 cockerels were randomly distributed to two experimental groups at 21 days of age. Samples (blood plasma, red blood cell, liver, kidney and spleen) were collected every 12 h during a 48‐h period. The results showed that the initial phase of lipid peroxidation, as measured by conjugated dienes and trienes in the liver, was continuously, but not significantly higher in T‐2 toxin‐dosed birds than in control birds. The termination phase of lipid peroxidation, as measured by malondialdehyde, was significantly higher in liver and kidney as a result of T‐2 toxin exposure at the end of the experimental period (48th hour). The glutathione redox system activated shortly after starting the T‐2 toxin exposure, which is supported by the significantly higher concentration of reduced glutathione and glutathione peroxidase activity in blood plasma at 24 and 48 h, in liver at 12, 24 and 36 h, and in kidney and spleen at 24 h. These results suggest that T‐2 toxin, or its metabolites, may be involved in the generation of reactive oxygen substances which causes an increase in lipid peroxidation, and consequently activates the glutathione redox system, namely synthesis of reduced glutathione and glutathione peroxidase. 相似文献
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自由基在鸭病毒性肝炎发病过程中的作用 总被引：1，自引：1，他引：0
用不同毒力的鸭肝炎病毒株人工感染雏鸭,建立了鸭病毒性肝炎病理模型.于感染后1、3、5、7 d剖杀雏鸭,采集血液和肝脏样品,测定血浆和肝组织中的一氧化氮(NO)、超氧化物歧化酶(SOD)和丙二醛(MDA),研究了自由基在鸭病毒性肝炎发病过程中的作用.结果表明雏鸭感染不同毒力株鸭肝炎病毒后1 d,血浆NO含量开始上升,3 d显著或极显著高于对照组,并持续至试验结束;肝组织NO含量在感染后1 d便显著升高.不同毒力株感染组雏鸭血浆和肝组织中SOD活性在感染后1 d便低于或显著低于对照组,而不同毒力株感染组雏鸭血浆和肝组织中的MDA却高于或显著高于时照组.提示,雏鸭感染鸭肝炎病毒后产生的自由基在鸭病毒性肝炎的发病过程中起重要作用. 相似文献
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羊种布鲁氏菌分子生物学研究进展 总被引：1，自引：0，他引：1
综述了近年来羊种布鲁氏菌的研究概况,着重介绍了羊种布鲁氏菌基因组、致病因子、致病机理以及分子生物学检测方法等方面的研究进展,并对未来的研究发展趋势提出见解,为最终使该菌所引发的相关疾病得到有效控制提供参考. 相似文献
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牛磺酸对马杜霉素中毒大鼠的保护作用 总被引：1，自引：1，他引：0
观察牛磺酸对大鼠马杜霉素中毒时的保护作用。将试验大鼠每天灌服马杜霉素进行染毒,且染毒前1 h腹腔注射牛磺酸保护,染毒5 d,继续注射牛磺酸2 d后处死,测定血清、肝脏、腿肌和心肌的丙二醛（MDA）含量、超氧化物歧化酶（SOD）活性、谷胱甘肽过氧化物酶（GSH-Px）活力和总抗氧化能力（T-AOC）。结果表明牛磺酸组的大鼠血清、肝脏、腿肌和心肌中SOD活性、GSH-Px活力、T-AOC均有所提高,MDA有所降低,与对照组、马杜霉素组比较,差异显著（P〈0.01,P〈0.05）。牛磺酸可以提高大鼠机体的抗氧化能力,对马杜霉素引起的脂质过氧化具有保护作用。 相似文献
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Vemulapalli R Contreras A Sanakkayala N Sriranganathan N Boyle SM Schurig GG 《Veterinary microbiology》2004,102(3-4):237-245
Brucella abortus strain RB51 is an attenuated rough strain, currently being used as the official live vaccine for bovine brucellosis in the USA and several other countries. In strain RB51, the wboA gene, encoding a glycosyltransferase required for the O-side chain synthesis, is disrupted by an IS711 element. Recently, we have demonstrated that strain RB51WboA, RB51 complemented with a functional wboA gene, remains rough but expresses low quantities of O-side chain in the cytoplasm. Mice vaccinated with strain RB51WboA develop greatly enhanced resistance against challenge with B. abortus virulent strain 2308. We have also demonstrated that overexpression of Cu/Zn superoxide dismutase (SOD) in strain RB51 (RB51SOD) significantly increases its vaccine efficacy against strain 2308 challenge. In this study, we constructed a new recombinant strain, RB51SOD/WboA, that over expresses SOD with simultaneous expression of O-side chain in the cytoplasm. We tested the vaccine potential of strains RB51SOD, RB51WboA, RB51SOD/WboA against challenge with virulent Brucella melitensis 16M and B. abortus 2308 in mice. In comparison with strain RB51, strain RB51SOD induced better protection against strain 2308, but not strain 16M, challenge. Similar to strain RB51WboA, vaccination with strain RB51SOD/WboA resulted in complete protection of the mice from infection with strain 2308. When challenged with strain 16M, mice vaccinated with either strain RB51WboA or strain RB51SOD/WboA were significantly better protected than those vaccinated with strain RB51 or RB51SOD. These results suggest that strains RB51WboA and RB51SOD/WboA are good vaccine candidates for inducing enhanced protection against B. melitensis infection. 相似文献
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Brucella species lacking the major outer membrane protein Omp25 are attenuated in mice and protect against Brucella melitensis and Brucella ovis 总被引：7，自引：0，他引：7
To aid in the development of novel efficacious vaccines against brucellosis, Omp25 was examined as a potential candidate. To determine the role of Omp25 in virulence, mutants were created with Brucella abortus (BA25), Brucella melitensis (BM25), and Brucella ovis (BO25) which contain disruptions in the omp25 gene (Deltaomp25 mutants). Western immunoblot analysis and PCR verified that the Omp25 protein was not expressed and that the omp25 gene was disrupted in each strain. BALB/c mice infected with B. abortus BA25 or B. melitensis BM25 showed a significant decrease in mean CFU/spleen at 18 and 4 weeks post-infection, respectively, when compared to the virulent parental strain (P<0.05, n=5). Mice infected with B. ovis BO25 had significantly lower mean CFU/spleen counts from 1 to 8 weeks post-infection, at which point the mutant was cleared from the spleens (P<0.01, n=5). Murine vaccination with either BM25 or the current caprine vaccine B. melitensis strain Rev. 1 resulted in more than a 2log(10) reduction in bacterial load following challenge with virulent B. melitensis (P<0.01, n=5). Vaccination of mice with the B. ovis mutant resulted in clearance of the challenge strain and provided 2.5log(10) greater protection against virulent B. ovis than vaccine strain Rev. 1. Based on these data, the B. melitensis and B. ovis Deltaomp25 mutants are interesting vaccine candidates that are currently under study in our laboratory for their safety and efficacy in small ruminants. 相似文献
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50只清洁级sD大鼠随机分为4组：对照组（5只）、模型组（15只）、富硒麦芽组（15只）和亚硒酸钠组（15只）。对照组和模型组饲喂大鼠基础饲料，饲料含硒量为0．1mg／kg；富硒麦芽组和亚硒酸钠组分别在基础饲料中补充富硒麦芽和亚硒酸钠，饲料含硒量为3．0mg／kg。除对照组外，其余3组采用0．01％二乙基亚硝胺（DEN）诱发大鼠肝癌16周，停止诱癌后继续饲养2周再处死全部大鼠，观察富硒麦芽对丙氨酸氨基转移酶（ALT）、碱性磷酸酶（ALP）、白蛋白（ALB）、总胆红素（TBIL）、一氧化氮（NO）、一氧化氮合成酶（NOS）、丙二醛（MDA）和谷胱甘肽过氧化物酶（GSH—Px）的影响。结果显示，富硒麦芽组大鼠血浆ALT、ALP、TBII—NO、MDA和肝组织NO、NOs、MDA显著低于模型组，全血和肝组织GSH—Px活性显著高于模型组；与亚硒酸钠组相比，富硒麦芽组大鼠血浆和肝组织的NO含量和NOS活性显著降低。试验表明富硒麦芽具有减轻肝脏损伤、延缓大鼠肝癌形成的能力，其作用机制之一可能为富硒麦芽能抑制NO的产生，清除体内大量过剩的氧自由基。减轻NO等自由基所致的脂质过氧化损伤。 相似文献
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Mense MG Borschel RH Wilhelmsen CL Pitt ML Hoover DL 《American journal of veterinary research》2004,65(5):644-652
OBJECTIVE: To develop an aerosol exposure method for induction of brucellosis in rhesus macaques (Macaca mulatta). ANIMALS: 10 adult rhesus macaques. PROCEDURE: 8 rhesus macaques were challenge exposed with 10(2) to 10(5) colony-forming units of Brucella melitensis 16M by use of an aerosol-exposure technique, and 2 served as control animals. All macaques were euthanatized 63 days after challenge exposure. Gross and microscopic lesions, bacterial burden in target organs, and histologic changes in tissues were evaluated. RESULTS: Grossly, spleen weights were increased in exposed macaques, compared with spleen weights in control macaques. Histologically, there was inflammation in the liver, kidneys, spleen, testes, and epididymides in exposed macaques. The spleen and lymph nodes had increased numbers of lymphohistiocytic cells. Morphometrically, the spleen also had an increased ratio of white pulp to red pulp. Areas of hepatitis and amount of splenic white pulp increased with increasing exposure dose. CONCLUSIONS AND CLINICAL RELEVANCE: Pathologic findings in rhesus macaques after aerosol exposure to B melitensis are similar to those observed in humans with brucellosis. IMPACT FOR HUMAN MEDICINE: These results may aid in the development of a vaccine against brucellosis that can be used in humans. 相似文献
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Kariminia A Kavoossy G Khatami S Zowghi E Ardestani SK 《Comparative immunology, microbiology and infectious diseases》2002,25(2):85-93
The aim of the present study is to investigate the cytokines induction by smooth lipopolysaccharides (S-LPS) extracted from Brucella melitensis (Rev1 vaccine strain) and Brucella abortus (a field isolate). These lipopolysaccharides were used to induce inflammatory cytokines production in peripheral blood cell culture of healthy individuals. Secretion of IL-10 and IL-12 (p70) were measured by means of specific Elisa. In addition, intracellular expression of IL-12 was assessed in CD14+ cells by flow cytometry. It was shown that Brucella LPS is a potent inducer of IL-10. However interferon gamma (IFN-gamma) priming was able to significantly decrease the production of IL-10. Flow cytometry studies showed that LPS alone was not able to induce intracellular IL-12 expression in CD14+ cells. Nevertheless, IFN-gamma priming significantly increased the percentage of CD14+ IL-12+ cells. In conclusion, it was demonstrated that the Brucella LPS could be a potent inducer of IL-10 and induction of IL-12 production needs the most favorable conditions. 相似文献
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饲粮镁对肉仔鸡生长、组织镁浓度及抗氧化功能的影响 总被引：1，自引：0，他引：1
研究比较了天门冬氨酸镁和氧化镁对肉仔鸡镁营养状态及肝脏和脾脏等组织抗氧化酶能力的影响。将252只1日龄的AA肉仔鸡随机分为7个处理组,每个处理6个重复,每个重复6只鸡。天门冬氨酸镁和氧化镁的添加水平为0.9、1.8、2.7g/kg日粮,基础日粮组作为不添加镁的对照组。日粮中添加镁能显著提高血清、肝脏和脾脏中的镁浓度(P<0.01),天门冬氨酸镁比氧化镁更能有效地提高血清和肝脏中的镁含量(P<0.01)。肝脏过氧化氢酶(CAT)的活性,随天门冬氨酸镁添加量的增加线性增加(P<0.01),随氧化镁添加量的增加呈二次曲线增加(P<0.05)。天门冬氨酸镁比氧化镁更有效地增强肝脏中CAT的活性(P<0.01)。脾脏CAT的活性随天门冬氨酸镁(P<0.05)或氧化镁(P<0.01)添加量的增加线性增加。肝脏(P<0.05)和脾脏(P<0.01)丙二醛MDA的浓度随氧化镁或天门冬氨酸镁添加量的增加线性降低。天门冬氨酸镁比氧化镁更有效地降低肝脏中的MDA浓度(P<0.01)。结果表明:日粮中添加镁能显著改善肉仔鸡各种组织中镁的含量,并能提高肝脏和脾脏等组织中抗氧化酶的活性,降低脂质过氧化水平。 相似文献
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Brucella melitensis Rev 1 organisms were salt-extracted and the cell surface proteins (BCSPs) were found to be mainly 39-42 kDa (group 2 porin proteins) in addition to 31.6, 32.5, 58.5 and 14.7 kDa proteins. DEAE-Sephadex anion-exchange column chromatography of BCSPs yielded fraction 1, which contained one major protein (39.8-42.0 kDa) and a minor protein (31.6 kDa). All these proteins were found to be immunogenic by Western blotting. Fraction 1 along with monophosphoryl lipid A and trehalose dicorynomycolate adjuvants as well as BCSPs alone induced significant (p < or = 0.05) protection in BALB/c mice. Both these immunizing agents produced almost equivalent protection to live B. melitensis Rev 1 vaccine at 15 and 30 days post challenge. Lymphocyte stimulation test as well as delayed-type hypersensitivity reaction revealed that both these preparations induced cell-mediated immune response. These preparations also induced humoral immune response as indicated by indirect ELISA. Neither of the immune responses was significantly less (p < or = 0.05) than that with live B. melitensis Rev 1 vaccine, except that their duration was short. 相似文献
19.
马尾藻多糖对小鼠免疫功能调节作用的研究 总被引：5，自引：2，他引：3
试验旨在观察马尾藻多糖（SP）对小鼠免疫调节的影响。用地塞米松作免疫抑制剂建立免疫功能低下动物模型,测定了小鼠胸腺指数和脾脏指数,血浆中溶菌酶含量和酸性磷酸酶（ACP）活力,胸腺和脾脏匀浆中总超氧化物歧化酶（SOD）、黄嘌呤氧化酶(XOD)、过氧化氢酶(CAT)、一氧化氮水平(NO)和丙二醛(MDA)含量。结果表明,马尾藻多糖能显著提高正常小鼠和免疫抑制小鼠的胸腺指数、血浆中溶菌酶含量、ACP活力和胸腺及脾脏中NO含量;显著提高免疫抑制小鼠脾脏CAT活力;增强正常小鼠脾脏总SOD活力;显著降低正常小鼠脾脏匀浆MDA含量;显著降低免疫抑制小鼠胸腺和脾脏匀浆中XOD活力。因此,马尾藻多糖能显著增强小鼠的免疫功能。 相似文献
20.
Changes in the lipid peroxide status of broiler chickens in acute monensin poisoning 总被引：2，自引：0，他引：2
The effect exerted by overdosage of monensin, an ionophore antibiotic, on the lipid peroxide status of broiler chickens was studied. Three-week-old broiler cockerels were given 150 mg monensin/kg body mass through a tube, and the malondialdehyde (MDA) concentration, glutathione peroxidase (GSH-Px) and catalase activity of the liver and breast muscle, and MDA concentration and GSH-Px activity of the blood plasma were determined. Liver MDA and catalase values rose rapidly and significantly during the experimental period. GSH-Px activity initially decreased, then tended to rise. Blood plasma and breast muscle variables did not change during the experiment. Acute monensin poisoning induced substantial enhancement of lipid peroxidation processes in the liver, while it did not appreciably affect the lipid peroxide status of the blood plasma and breast muscle. The role of the observed phenomenon in the rather complex pathogenesis of monensin poisoning is not known sufficiently. Further studies are needed to elucidate the problem. 相似文献