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铜导致肉鸡肝细胞游离钙的超载 总被引：1，自引：1，他引：0
选用硫酸铜作为试验铜源,向即时分离的肉鸡肝细胞悬液中加入不同剂量的铜(铜终浓度分别为:0,5,10,20,30μmol/L),孵育不同时间(5,10,15,20,30 min)后观察肝细胞内游离钙浓度的变化.结果显示:高剂量的铜可破坏细胞内游离钙稳态.钙内流造成细胞内钙超载,30μmol/L铜刺激组的[Ca2+]i显著高于对照组(P<0.05).肝细胞在10 μmol/L Cu2+环境中孵育不同时间后显示,时间越长.细胞内钙浓度越高;此结果表明,10μmol/L铜能诱导细胞内游离钙的超载,并具有浓度依赖性和时间依赖性,暗示铜对体细胞的毒害作用可能是通过改变细胞内游离钙浓度来实现. 相似文献
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为了研究维生素C对铜孵育的肉鸡原代肝细胞周期及细胞膜电位的影响,试验将全量换液24 h后的原代肝细胞分为正常对照组(Ⅰ组)和10μmol/L Cu2+(Ⅱ组)、30μmol/L Cu2+(Ⅲ组)、50μmol/L Cu2+(Ⅳ组)、50μmol/L维生素C+50μmol/L Cu2+(Ⅴ组)刺激组,于体外刺激后48小时用流式细胞仪测定各组的细胞周期及细胞膜电位。结果表明:30μmol/L和50μmol/L Cu2+能明显引起静止期肝细胞数增多,增殖期肝细胞数减少,细胞膜电位下降(P<0.05),10μmol/L Cu2+组没有出现明显变化。说明维生素C可显著抑制50μmol/L Cu2+引起的变化,对细胞具有保护作用。 相似文献
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通过流式细胞仪测定各组的细胞周期及细胞膜电位,研究高铜对肉鸡原代肝细胞凋亡的影响。将全量换液24h后的细胞分为空白对照组和低铜组（10μmol/L Cu2＋组）、高铜Ⅰ组（50μmol/L Cu2＋组）、高铜Ⅱ组（100μmol/L Cu2＋组）,培养48h后测定荧光值,结果表明,高铜组能显著引起静止期（G0/G1）肝细胞数增多、增殖期（S、G2＋M）肝细胞数减少、细胞膜电位下降（P〈0.05）;低铜组未出现明显变化;表明高浓度的铜能明显改变肝细胞的细胞周期及细胞膜电位。 相似文献
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向即时分离的肉鸡肝细胞线粒体培养液内加入终浓度分别为10、30、50μmol/L的Cu2＋和200μmol/L GSH＋50μmol/L Cu2＋,孵育20min后,观察培养液中不同铜浓度对线粒体H2O2生成速率和呼吸链复合物活性的影响。结果表明,30μmol/L和50μmol/L的Cu2＋能引起线粒体H2O2生成速率和呼吸链复合物活性出现明显加快和降低（P〈0.05或P〈0.01）,10μmol/L Cu2＋组没有出现明显变化;谷胱甘肽可显著抑制50μmol/L Cu2＋引起的变化（P〈0.01）,对线粒体具有保护作用。 相似文献
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以CuSO4.5H2O为铜源,用含Cu2＋终浓度为0μmol/L（A组）、5μmol/L（B组）、10μmol/L（C组）、15μmol/L（D组）、20μmol/L（E组）和30μmol/L（F组）的孵育介质对从肉鸡肝脏提取的线粒体进行孵育,每个铜浓度下孵育时间为10,25,40min;采用Clark氧电极法对孵育后的线粒体进行呼吸功能测定：呼吸控制率（RCR）、氧化磷酸化效率（OPR）和磷氧比（P/O）。结果显示,随着铜离子浓度的增加和孵育时间的延长,线粒体RCR,P/O和OPR这3项指标均出现不同程度降低;表明铜引起体外孵育的鸡肝脏线粒体功能损伤,且呈明显的时间、剂量效应。 相似文献
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铜对肉鸡肝细胞线粒体H2O2生成的影响 总被引：1，自引：0，他引：1
选用硫酸铜作为实验铜源,向即时分离的肉鸡肝细胞线粒体溶液内加入不同浓度的铜,孵育不同时间后,以2',7'-二氯二氢荧光磺为荧光指示剂,琥珀酸盐为底物,以SOD为催化刑观察在不同抑制剂存在下肝细胞线粒体H2O2生成的变化.结果显示:分别用10 μmol/L Cu(试验组Ⅰ)、20 μmol/L Cu(试验组Ⅱ)和30 μmol/L Cu(试验组Ⅲ)孵育线粒体10 min后.其过氧化氢生成速率显著高于对照组(0 μmol/L)(P<0.01).此外各组的起始H2O2含量也随铜浓度的升高和孵育时间的延长而增加.结果表明.Cu2-对线粒体H2O2的生成有显著影响,不但可以提高线粒体中的基准H2O2含量,而且能加快H2O2的生成速率.铜浓度越高.孵育时间越长,生成速率越大,说明铜可诱导体内的氧化反应,或降低体内的抗过氧化作用,促使线粒体氧化呼吸链中电子的漏出.在SOD催化下,H2O2生成增多并加快.这种现象的发现可能是微量元素铜对生物机体造成毒害作用的原因之一. 相似文献
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《中国兽医学报》2017,(1)
选用浓度为30,60,120,180,240μmol/L的氯化铜(CuCl_2)作用于原代大鼠脑微血管内皮细胞(BMEC)12h,测定细胞活力、细胞内超氧化物歧化酶(SOD)、过氧化氢酶(CAT)和诱导型一氧化氮合酶(iNOS)活性的变化。结果显示:与对照组相比,细胞活力明显降低,30μmol/L浓度组SOD的活性变化不明显,60μmol/L和120μmol/L浓度组SOD的活性升高,而180μmol/L和240μmol/L浓度组SOD的活性降低,CAT的活性均明显降低,iNOS的活性均明显升高。结果表明:铜过量可致BMEC损伤,而氧化应激是其中一个重要因素。 相似文献
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国内生态恢复研究进展 总被引：10，自引：1，他引：9
本文介绍了生态恢复的研究进展,从生态恢复的定义、退化生态系统的指标等方面进行阐述,重点对国内在恢复生态学方面的进展做了介绍。对当前的人工草地、草地农业的研究情况做了一些概述。 相似文献
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Gesek M Szarek J Babińska I Wojtacka J Sobczak-Filipiak M Felsmann MZ 《Polish journal of veterinary sciences》2008,11(2):193-197
This paper presents the main trends in the activity of European veterinary pathologists in the context of their oral presentations (plenary lectures and short presentations) and posters provided during annual meetings of the European Society of Veterinary Pathology (ESVP), in the decade 1997-2006. It was found that the issue that was most often brought up in the meetings was organ pathology (566 presentations). Infectious and parasitical diseases were only slightly less frequent (548 presentations). Oncology was another common issue (404 presentations). During this decade, 52 plenary lectures were presented, 765 oral presentations and 1 072 posters. Altogether, 1 889 presentations were made, which is between 127 and 238 per year. Research by Polish scientists accounted for 3.16% of all presentations. Additionally, the subject matter discussed at the annual meetings is analysed, and the trends in the development of veterinary diagnostic pathology and broad pathology education are indicated. It is shown that veterinary pathology enhances knowledge in the field of veterinary medicine by fulfilling a cognitive and diagnostic role. 相似文献
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Evidence for the non-involvement of the uterus in the lifespan of the corpus luteum in the cyclic dog 总被引：1，自引：0，他引：1
Progesterone levels in peripheral blood of dogs were analysed during the cycle in which hysterectomy (n = 5) or sham surgery (n = 3) was performed as well as during the cycle of dogs (n = 5) hysterectomized at least one year prior to this study; the data were compared with the findings in control dogs (n = 3). The averages of the duration of the luteal period observed in the three experimental groups were not significantly different from those of control dogs. Immediately after surgery, the progesterone level decreased from 25 to 50% of the presurgical level, but returned to presurgical level in about four days. Prolactin levels were elevated for about 30 h after surgery. Nevertheless, the averages of the mean prolactin levels for each animal during the luteal period of the experimental groups were not significantly different from those of control dogs. It is concluded that in the dog, the uterus is not involved in the lifespan of the cyclic corpus luteum. 相似文献
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P H Kass D R Strombeck T B Farver A A Ardans 《American journal of veterinary research》1985,46(11):2336-2339
To find possible associations between antinuclear antibody (ANA) pattern, ANA titer, and certain clinical changes and clinical laboratory test results in dogs, the veterinary medical records of 111 ANA-positive and 126 ANA-negative dogs were examined. Variables could not be found that had significant associations with ANA pattern (unlike the results in persons), because of the predominance of 2 patterns. A log-linear model for ANA titer adequately fit the observed frequency and included 2-way interactions between titer and polyarthritis, titer and hematologic disorders, and polyarthritis and lymphadenopathy. 相似文献
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In a 4-year period nine dogs have been met in which there was incomplete growth of the radius. The condition was unilateral in eight dogs and bilateral in one. Two were littermates. The defect is due to premature cessation of growth of the distal growth plate of the radius but the cause of this is not precisely known. It is recognized by characteristic radiographic changes in radius length, elbow joint space and premature closure of the distal growth plate of the radius. A method of surgical treatment has been devised and has proved beneficial in five dogs. Zusammenfassung. In einer Vierjahresperiode wurden neun Hunde beobachtet, bei denen ein unvollständiges Wachstum des Radius vorlag. Bei acht Hunden war der Zustand nur auf einer Seite zu finden, bei einem Hund auf beiden Seiten. Zwei der Hunde gehörten zum gleichen Wurf. Der Mangel ist auf verfrühte Wachstumseinstellung der distalen Wachstumsplatte des Radius zurückzuführen, jedoch ist die Ursache davon nicht genau bekannt. Er wird an charakteristischen radiographischen Veränderungen der Radiuslänge, des Ellbogengelenkzwischenraums und vorzeitigem Abschluss der distalen Wachstumsplatte des Radius erkannt. Es wurde eine chirurgische Behandlungsmethode entwickelt, die sich bei fünf Hunden als nutzlich erwies. Résumé. Au cows d'une période de 4 ans on a observé 9 cas de croissance incomplète du radius chez des chiens; l'anomalie était unilatérale dans 8 cas et bilatérale dans un cas; deux chiens appartenaient à la même portée. L'anomalie est due à l'arrêt prématuré de croissance de la plaque de croissance distale du radius, mais la cause n'en est pas encore connue d'une manière précise. Le diagnostic se fait par les signes radiologiques caractéristiques, modifications de la longueur du radius, de l'articulation du coude et soudure prématurée de la plaque de croissance du radius. On a élaboré une méthode de traitement chirurgical, qui s'est montrée favorable chez 5 chiens. 相似文献
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