共查询到19条相似文献，搜索用时 218 毫秒
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《中国兽医杂志》2019,(11)
为探究枳椇子对急性酒精性肝损伤细胞的作用及其机制。首先, SD大鼠枳椇子水提液及生理盐水灌胃后心脏取血,制备枳椇子含药血清及空白血清。然后用酒精诱导人LO_2细胞构建酒精损伤细胞模型,并随机将细胞分为正常组、模型组、空白血清组和不同剂量含药血清组,采用MTT法检测细胞存活率;酶标法检测丙氨酸氨基转移酶(ALT)和天门冬氨酸氨基转移酶(AST)的酶活力,及丙二醛(MDA)含量;WST-1法检测超氧化物歧化酶(SOD)活性,最后分析评估枳椇子对急性酒精性肝损伤的保护作用。结果显示,与空白血清组比较,5%和10%含药血清组肝细胞存活率显著升高(P0.05); ALT和AST活性显著降低(P0.05); MDA含量明显降低,SOD活性显著升高(P0.05)。表明枳椇子对酒精诱导的肝细胞损伤有一定的保护作用,可能通过抗氧化作用的机制来实现其保护作用。 相似文献
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为探讨丹参对脂肪变性奶牛肝细胞的作用机制,采用胶原酶两步灌流法分离培养奶牛肝细胞,不同浓度DL-乙硫氨酸处理,油红染色观察其脂滴数量,MTT法测定肝细胞的活性,生化法检测TG含量。用不同浓度的丹参处理变性肝细胞后,生化法检测ALT、AST、TG、SOD、MDA的含量或活性,ELISA法测定TNF-α的含量,Western blot法检测NF-κB和CYP450的蛋白表达水平。结果显示,筛选出2 mmol/L的DL-乙硫氨酸作用24 h作为体外造模的最佳条件。用丹参处理后,能降低ALT、AST、TG和MDA的活性或含量,抑制TNF-α的释放,增加SOD活性。随丹参浓度增加和处理时间的延长,CYP450的表达呈逐渐降低的趋势。24 h时,丹参对NF-κB的表达无明显影响;48 h时,随丹参浓度的增加,NF-κB的表达呈逐渐降低的趋势。这表明丹参对奶牛脂肪肝有一定的治疗作用,其作用机制与促进脂质代谢、抑制肿瘤细胞坏死因子、抗脂质过氧化及降低NF-κB和CYP450的表达密切相关。 相似文献
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为了观察胡麻籽提取物(EFS)对高脂饮食导致大鼠肝损伤的保护作用,试验通过高脂饮食建立大鼠非酒精性脂肪肝病模型,然后测定正常对照组,高脂模型组,EFS低剂量组(0.25 g/m L)、中剂量组(0.5 g/m L)、高剂量组(1 g/m L)血清中丙氨酸氨基转移酶(ALT)、门冬氨酸氨基转移酶(AST)、超氧化物歧化酶(SOD)活性和丙二醛(MDA)含量。结果表明:EFS能显著降低血清中ALT、AST、MDA含量,提高SOD活性。说明EFS具有一定的保护因高脂饮食导致的肝脏损伤,其作用机制可能与抑制脂质过氧化有关。 相似文献
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硒对汞致雏鸡肝功能损伤的拮抗作用 总被引：1，自引：0，他引：1
选用健康伊沙褐雏鸡250只，分为对照组、汞中毒组、3个水平的硒保护组，研究汞对血清中门冬氨酸氨基转移酶（AST）、丙氨酸氨基转移酶（ALT）、碱性磷酸酶（ALP）、肝组织中谷胱甘肽过氧化物酶（GSH－Px）活性和丙二醛（MDA）含量的影响以及硒与汞之间的相互作用效应。试验结果表明，汞可使血清中AST、ALT、ALP活性显著升高（P＜0．01），使肝组织中GSH－Px活性降低（P＜0．01），引发肝组织脂质过氧化，致使肝组织中MDA含量显著增高（P＜0．01），且有时间－效应关系，硒可使血清中AST、ALT、ALP活性显著降低（P＜0．01），使肝组织中GSH－Px活性显著升高（P＜0．01），阻止肝组织脂质过氧化，致使肝组织中MDA含量显著降低（P＜0．01），且有时间－效应关系，从而说明汞中毒损伤肝功能；硒对汞致肝功能的损伤具有拮抗作用。 相似文献
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为了探讨蔓越橘提取物对高脂大鼠氧化损伤的作用。试验选取50只体重120 g左右的SD雄性大鼠为试验动物,随机分成正常组、模型组和高、中、低3个试验组,每组10只。饲喂试验8周后,分别测定各组大鼠肝脏中丙二醛(MDA)含量与超氧化物歧化酶(SOD)活性、血清中甘油三酯(TG)、高密度脂蛋白胆固醇(HDL-C)的含量与丙氨酸氨基转移酶(ALT)、天门冬氨酸氨基转移酶(AST)和碱性磷酸酶(ALP)的活性。试验结果显示,与模型组比较,中、高剂量组中的TG降低显著(P<0.05),且试验组低剂量组的HDL-C量变化显著(P<0.05);饲喂蔓越橘提取物的试验组血清ALT、AST和ALP活性均有明显上升,并呈现一定剂量效应关系;试验各组大鼠肝脏中SOD活性明显增强(P<0.01),而MDA的生成量逐渐减少。结果表明,蔓越橘提取物能减轻高脂大鼠肝脏氧化损伤和脂质蓄积。 相似文献
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试验旨在研究罗汉果总皂苷改善高糖高脂饲料联合链脲佐菌素致2型糖尿病大鼠的作用,以高糖高脂饮食联合链脲佐菌素建立2型糖尿病大鼠模型,造模成功大鼠灌胃给予罗汉果总皂苷（100、200、400 mg/kg）或二甲双胍（268 mg/kg）,每天1次,连续给药4周后,记录"三多一少"指标（24 h内尿量、饮水量和采食量,体重）;检测生化指标,分析空腹血糖值（FBG）、血清总胆固醇（TC）、甘油三酯（TG）、低密度脂蛋白胆固醇（LDL-C）、高密度脂蛋白胆固醇（HDL-C）、胰岛素（INS）、过氧化氢酶（CAT）、超氧化物歧化酶（SOD）、丙二醛（MDA）、丙氨酸氨基转移酶（AST）、天冬氨酸氨基转移酶（ALT）、尿素氮（BUN）和肌酐（Cr）水平,采用苏木素-伊红染色法（HE）观察胰腺的病理学改变。与模型组比较,罗汉果总皂苷各剂量组及二甲双胍组均可显著或极显著降低采食量、饮水量、尿量,血液指标FBG、INS、MDA、TC、TG、BUN和Cr水平、以及AST和ALT活性（P<0.05;P<0.01）,而CAT、SOD活性和HDL-C水平显著或极显著升高（P<0.05;P<0.01）;胰腺组织中,胰腺细胞数目明显增多,胰腺病理性损伤明显减轻。罗汉果总皂苷及二甲双胍均具有明显改善糖代谢紊乱的作用,同时可明显减轻胰岛素抵抗,增强机体抗氧化应激的能力和改善肝肾功能。 相似文献
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本试验旨在研究桃金娘水提物对CCl4复合因素造模法诱导的肝脏纤维化大鼠的保护作用,探讨其作用机制。取SD大鼠72只,随机分为模型组、秋水仙碱组（1×10-4 mg/g）、桃金娘水提物低剂量（1.5 mg/g）、中剂量（3 mg/g）、高剂量（6 mg/g）组及正常组,每组12只。除正常组外,其余各组大鼠于第1~4周皮下注射40% CCl4花生油溶液,注射剂量为0.3 mL/100 g体重,隔日1次,连续4周,同时第2~4周给予30%乙醇灌胃1 mL/只,隔日1次,连续3周。各组大鼠于第5周开始灌胃给药,灌胃体积量为1 mL/100 g体重,正常组、模型组给予等量生理盐水,桃金娘水提物组分别按照相应剂量灌胃给药,每日1次,连续给药4周,给药的同时仍继续造模。给药结束后,检测各组大鼠血清中丙氨酸氨基转移酶（ALT）、天门冬氨酸氨基转移酶（AST）活性、总胆红素（TBil）、α-平滑肌肌动蛋白（α-SMA）、转化生长因子-β（TGF-β）等的水平、丙二醛（MDA）含量及超氧化物歧化酶（SOD）、谷胱甘肽过氧化物酶（GSH-Px）活性;观察肝脏组织HE及Masson染色的变化。试验结果显示,桃金娘水提物可显著或极显著降低肝脏纤维化大鼠AST、ALT活性、TBil、TGF-β及α-SMA水平（P<0.05;P<0.01）,提高大鼠血清SOD、GSH-Px活性（P<0.05）,降低MDA含量（P<0.01;P<0.05）,减轻肝脏纤维化大鼠肝脏病理损伤程度。以上结果表明,桃金娘水提物对CCl4复合因素所致肝脏纤维化大鼠的肝脏功能具有明显的恢复作用,可增强其抗氧化能力,减轻肝细胞损伤,具有较好的抗肝脏纤维化作用。 相似文献
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为研究建立大鼠脂肪肝体外模型的方法,试验采用原代肝细胞体外培养的方法培养大鼠肝细胞.对正常贴壁培养的肝细胞用1.0,2.0,3.0,4.0,5.0 mmol/L DL-乙硫氨酸处理,分别测定处理前及处理后24,48小时细胞培养基上清液中丙氨酸氨基转移酶(ALT)、天门冬氨酸氨基转移酶(AsT)的活性以及细胞裂解液中甘油三酯(TG)的含量.结果表明:贴壁培养的正常肝细胞用DL-乙硫氨酸处理后,培养基中ALT、AST的活性均有不同程度升高,其中5.0 mmol/,L处理组升高明显,与对照组相比差异极显著(P<0.01);4.0,5.0 mmol/L组的细胞裂解液中TG含量与对照组相比差异极显著(P<0.01).结果说明试验建立了大鼠脂肪肝药物损伤的体外模型,可以为在细胞水平筛选治疗脂肪肝的药物提供参考模型. 相似文献
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旨在探讨长期铝暴露对大鼠肝脏损伤及其功能的影响,为防制其对动物肝脏器官的危害提供理论依据。48只4周龄雄性Wistar大鼠随机分为4组,分别于饮水中添加0,64.18,128.36,256.72mg/kg体重AlCl3.6H2O溶液建立长期铝暴露大鼠模型,试验期120d。断头处死大鼠,检测血清丙氨酸氨基转移酶(ALT)、天门冬氨酸氨基转移酶(AST)活性及血清和肝脏中谷胱甘肽过氧化物酶(GSH-PX)、超氧化物歧化酶(SOD)活性和丙二醛(MDA)含量。结果表明,随染铝剂量的增加,各染铝组血清ALT、AST活性及肝脏MDA含量显著高于对照组(P<0.01、P<0.05);染铝组肝脏GSH-PX活性显著低于对照组(P<0.01),SOD活性呈先升高后下降趋势,低剂量组高于对照组,高剂量组显著低于对照组(P<0.01)。说明长时间铝暴露可增强肝脏脂质过氧化反应,降低抗氧化能力,引发氧化损伤,进而影响肝脏功能。 相似文献
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To explore the acting mechanism of Pueraria extract on fatty liver hepatocytes in dairy cows. The hepatocytes in dairy cows were isolated by two-step collagenase perfusion method and observed. The hepatocytes cultured in vitro were treated with different concentrations of Pueraria extract. The activities and contents of ALT, AST, TG, SOD and MDA in the hepatocytes were detected by biochemical methods. Results showed that in the administration of Pueraria extract with the concentrations of 50,100 and 500 μg/mL could extremely significantly reduce the liver cells of ALT, AST, TG, TC, MDA activity and content, increase SOD activity (P < 0.01). The Pueraria extract had significantly therapeutic effect on dairy cows fatty liver of biochemical indexes. The mechanism might be related to regulate lipid metabolism and anti lipid peroxidation. 相似文献
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An association between the level of oxidative stress and the concentrations of NEFA and BHBA in the plasma of ketotic dairy cows 
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下载免费PDF全文 X. C. Wang S. B. Feng X. B. Li Z. Wang G. W. Liu X. W. Li 《Journal of animal physiology and animal nutrition》2016,100(5):844-851
The aim of this study was to evaluate the oxidative status in ketotic cows. We observed changes in the oxidative status and correlations between the oxidative and metabolic status in non‐ketotic (n = 10), subclinical ketotic (n = 10) and ketotic cows (n = 10). Plasma samples were analysed by standard biochemical techniques and ELISA to determine traditional metabolic parameters: triglyceride (TG), phosphonium (P), calcium (Ca), aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase (ALP), total protein (TP), albumin (ALB), immune globulin (Ig), total cholesterol (TC), high‐density lipoprotein (HDL), very low‐density lipoprotein (VLDL) and lactate dehydrogenase (LDH); energy metabolism indices: glucose, β‐hydroxybutyrate (BHBA) and non‐esterified fatty acids (NEFA); and indices of oxidative status: malondialdehyde (MDA), hydrogen peroxide (H2O2), vitamin C, vitamin E, superoxide dismutase (SOD), glutathione peroxidase (GSH‐Px), catalase (CAT), xanthine oxidase (XOD) and total antioxidant capacity (TAOC). The results of this study showed that plasma glucose levels were lower in ketotic and subclinical ketotic cows than in non‐ketotic cows; however, the plasma NEFA and BHBA concentrations were higher. In addition, significant decreases in TC, HDL and VLDL and significant increases in AST, ALT and LDH were observed in the plasma of the ketotic cows. The ketotic cows showed decreased plasma SOD, CAT, vitamin C and vitamin E, inhibited hydroxyl radical capacity and increased plasma H2O2 and MDA. There were positive correlations between the plasma NEFA and ALT, AST, LDH and MDA and negative correlations between the plasma NEFA and TC, HDL, VLDL, SOD, vitamin C, vitamin E, 1542280 uric acid and inhibited hydroxyl radical capacity. In addition, there were positive correlations between BHBA concentrations and ALT, AST and LDH and negative correlations between plasma BHBA concentrations and TC, HDL, VLDL, vitamin E and inhibited hydroxyl radical capacity. Overall, ketotic dairy cows experience oxidative stress, which is presumably associated with hyperketonemia and higher NEFA. 相似文献
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[目的] 通过受试者工作特征（receiver operating characteristic，ROC）曲线筛选诊断脂肪肝生物标志物的最佳临界值。[方法] 随机采集77头产后7 d中国荷斯坦奶牛血清，测定生理生化指标。根据Reid方程计算的Y值将奶牛分为正常组（Y>1）和脂肪肝组（Y<1），比较两组奶牛血清指标的差异，并与Y值进行相关性分析，筛选组间差异与相关性显著的指标作为生物标志物，用ROC曲线评估生物标志物的AUC值、诊断敏感性与特异性和最佳临界值。将Reid方程诊断脂肪肝的准确率作为标准，用非酯化脂肪酸（NEFA）、谷草转氨酶（AST）的最佳临界值检测461头奶牛患脂肪肝的情况。[结果] 生理生化检测结果表明NEFA、葡萄糖（Glu）、AST、谷丙转氨酶（ALT）在2组间差异极显著（P<0.01），总蛋白（TP）组间差异显著（P<0.05），其他指标两组间无显著差异（P>0.05）；NEFA、Glu、AST、ALT、TP、甘油三酯（TG）、低密度脂蛋白胆固醇（LDL-C）、胰岛素（Ins）、胰高血糖素（Gln）与Y值显著相关（P<0.05），可作为生物标志物；NEFA、AST、ALT和Gln的AUC值>0.5能准确诊断脂肪肝，诊断敏感性分别为81.8%、72.7%、63.6%和54.5%，特异性分别为92.8%、89.4%、84.8%和69.7%，最佳临界值分别为471.74 μmol/L、95.50 U/L、46.50 U/L和64.60 ng/mL。用NEFA、AST和NEFA+AST最佳临界值诊断脂肪肝的准确率分别高达89.96%、73.49%和69.08%。Y值诊断发病率为54.01%，NEFA、AST、NEFA+AST诊断出的发病率分别为48.59%、39.70%和37.31%。[结论] NEFA、AST、ALT和Gln可用于快速、准确地诊断脂肪肝。 相似文献
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近年来高产奶牛围产期维生素E(VE)缺乏较为普遍,但这一问题在牛场最易被忽视。为此,本试验在某一大型集约化牛场,选取VE缺乏组奶牛40头,健康组奶牛40头,对试验奶牛的抗氧化、肝功、能量代谢、矿物元素和其他维生素指标进行显著性分析、Pearson相关性分析和回归分析及ROC分析。结果显示:与健康组相比,VE缺乏组血浆中总抗氧化能力(T-AOC)、高密度脂蛋白(HDL)、白蛋白(ALB)水平极显著降低,与VE水平呈正相关;而血浆中丙二醛(MDA)、过氧化氢酶(CAT)、谷草转氨酶(AST)、低密度脂蛋白(LDL)、游离脂肪酸(NEFA)、肌酐(CREA)水平极显著升高,与VE呈负相关;血浆中谷丙转氨酶(ALT)、β-羟丁酸(BHBA)水平显著升高,与VE呈负相关。并且,确立了血浆中HDL、T-AOC、ALB、LDL、AST、NEFA和MDA可作为VE缺乏症的预警指标,其预警值分别为HDL<1.495 mmol/L,T-AOC<0.305 mmol/L,LDL>4.09 mmol/L,ALB<51.7 g/L,MDA>11.19 mmol/L,AST>37.2 U/L和NEFA>713μmol/L。结论:VE缺乏与氧化应激、肝功、能量代谢有密切关系,7项生化指标可用于奶牛围产期VE缺乏症的预警,为今后更有效地监控和预防奠定理论基础。 相似文献
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Sato H Mohamed T Goto A Oikawa S Kurosawa T 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2004,66(1):85-87
To elucidate possible relationships between triglyceride (TG) levels and fatty acid composition in bovine liver, hepatic TG and seven individual fatty acids were measured in 23 Holstein dairy cows, of them 6 are healthy. Liver TG level was greater than 3 % in 12 cows which were ruled fatty liver. Palmitic and oleic acid proportions were significantly higher in fatty liver cows than in the healthy cows, while stearic acid was lower in fatty liver cows. With increased liver TG, stearic acid proportions decreased dramatically. Results indicate that hepatic lipidosis markedly alters the proportions of the various fatty acids in the liver of dairy cows. 相似文献
16.
试验旨在探究连翘提取物（FSE）预防性干预对对乙酰氨基酚（acetaminophen,APAP）诱导小鼠肝损伤的保护作用及其潜在作用机制。采用半仿生-生物酶法提取连翘有效成分,使用APAP构建小鼠肝损伤模型。随机将60只雌性昆明小鼠分入正常对照（NC）组、APAP肝损伤模型（LD）组、连翘提取物（FSE）对照组、连翘提取物高剂量（HFSE＋LD）组、连翘提取物中剂量（MFSE＋LD）组和连翘提取物低剂量（LFSE＋LD）组,每组10只。HFSE＋LD组、MFSE＋LD组、LFSE＋LD组分别按每天200、100、50 μg/g灌胃给予连翘提取物,NC组和LD组分别灌胃等量生理盐水,每天2次,连续给药6 d。预防性给药3 d后,腹腔注射APAP,每天1次。末次给药12 h后,试验小鼠眼球采血并快速取出肝脏,检测血清中丙氨酸氨基转移酶（ALT）和天门冬氨酸氨基转移酶（AST）活性,以评价肝损伤程度;检测肝脏匀浆液中还原型谷胱甘肽（GSH）、超氧化物歧化酶（SOD）、丙二醛（MDA）和过氧化氢（H2O2）水平,以评价肝脏氧化应激程度;制作肝脏病理切片,经苏木精伊红（HE）染色后观察肝脏病理变化;采用探针药物法测定肝脏线粒体细胞色素P4502E1（CYP2E1）活性;采用实时荧光定量PCR检测肝脏线粒体CYP2E1 mRNA表达水平;采用Western blotting法检测肝脏CYP2E1蛋白表达情况。结果表明：与NC组相比,LD组小鼠血清中ALT、AST活性均显著增加（P<0.05）;肝脏SOD活性、GSH含量均显著降低（P<0.05）,MDA、H2O2含量,CYP2E1 mRNA及蛋白表达水平均显著升高（P<0.05）,成功构建小鼠肝损伤模型。200、100和50 μg/g的连翘提取物可显著降低肝损伤小鼠血清ALT和AST活性（P<0.05）,显著提高肝脏中SOD活性（P<0.05）;200、100 μg/g连翘提取物可显著提高肝脏中GSH水平（P<0.05）,显著降低肝脏中MDA、H2O2水平及CYP2E1的mRNA和蛋白表达量（P<0.05）。以上结果表明,连翘提取物可减轻APAP诱导的小鼠肝损伤程度且呈剂量依赖性,其潜在作用机制可能与所含活性物质的抗氧化作用以及对CYP2E1酶活性和表达的抑制有关。 相似文献
17.
肝细胞损伤是围产期奶牛脂肪肝病的主要病理特征。本研究旨在探讨甘草酸单铵盐（monoammonium-glycyrrhizinate,MAG）对油酸钠诱导奶牛原代肝细胞损伤的影响。试验以体外培养的肝细胞为研究对象,根据处理不同分为对照组（未做处理的原代肝细胞）和试验组（模型组、MAG组：分别添加0、0.25 mg·L-1的MAG对原代肝细胞预处理12 h,再使用浓度为0.25 mmol·L-1的油酸钠诱导肝细胞脂肪变性）,随后用CCK-8法检测肝细胞活性、DAPI染色统计凋亡率,紫外比色法检测上清中ALT、AST的含量,油红O染色结合imageJ面积统计法分析细胞内脂肪沉积水平,实时荧光定量PCR（RT-qPCR）检测样品肝细胞脂代谢相关基因PPARα、SREBP-1c、ChREBP、CPT1、CPT2、MTP和炎症相关基因TNF-α、NF-κB、IL-1β、IL-6、IL-8的mRNA表达水平。试验结果显示,经油酸钠诱导后,0.25 mg·L-1的MAG预处理的肝细胞活性显著高于未经处理的模型组（P<0.05）,凋亡率明显降低（P<0.05）,培养上清中ALT、AST的释放水平有所降低（P<0.05）。MAG组细胞内脂滴数量和平均脂滴面积较模型组明显减少（P<0.05）,脂代谢基因ChREBP、PPARα、MTP和炎症相关基因TNF-α、IL-1β、NF-κB、IL-6、IL-8的mRNA表达水平均显著下调（P<0.05）。结果表明,MAG能通过抑制脂代谢和炎症因子相关基因的表达,有效减少油酸钠诱导的肝细胞内脂肪的沉积,缓解肝细胞损伤。 相似文献
18.
Hepatocytes injury is the main pathological feature of fatty liver disease in cows during the perinatal period. The aim of this study was to investigate the preventive effect of monoammonium glycyrrhizinate (MAG) on cell damage induced by sodium oleate in hepatocytes of cows. Primary hepatocytes of cows cultured in vitro were divided into 3 groups according to different treatments:control group (untreated primary hepatocytes) and 2 experimental groups (model group, MAG group:add 0 mg·L-1, 0.25 mg·L-1 MAG in culture media respectively, for 12 h and then use sodium oleate at a concentration of 0.25 mmol·L-1 to induce hepatocytes steatosis), and then the activity of hepatocytes were detected by CCK-8, the cell apoptosis rate was calculated by DAPI fluorescence staining, the content of ALT and AST in the culture solution were detected by ultraviolet colorimetry, the levels of intracellular fat deposition were analyzed by oil red O staining and imageJ. Real-time fluorescence quantification (RT-qPCR) was used to detect the mRNA expression of lipid metabolism-related genes PPARα,SREBP-1c,ChREBP,CPT1,CPT2,MTP and inflammation-related genes TNF-α,NF-κB,IL-1β,IL-6,IL-8. The experimental results showed that hepatocytes preconditioning with 0.25 mg·L-1 MAG could improve the activity of model cells (P<0.05), and inhibit the apoptosis rate of model cells effectively (P<0.05). The release levels of ALT and AST in the cell culture supernatant of the MAG group were lower than those of the model group (P<0.05). At the same time, compared with the model group, the number of intracellular lipid droplets and the average lipid droplet area of hepatocytes treated with MAG were significantly reduced (P<0.05). And then the levels of lipid metabolism genes ChREBP, PPARα, MTP and inflammation related genes TNF-α, IL-1β, NF-κB, IL-6, IL-8 mRNA were significantly down-regulated in MAG group than the model group (P<0.05). The results showed that MAG could alleviate the impact and relieve lipid deposition induced by sodium oleate in hepatocytes by inhibiting the expression of genes related to lipid metabolism and inflammatory cytokines, which indicated that it could provide protection for the liver. 相似文献
19.
The objective of the present study was to analyse the apoptotic process of liver cells in dairy cows with fatty infiltration of the liver using indicators of DNA damage and immunohistochemistry. For this purpose, sixteen dairy cows with fatty liver were examined. On clinical examination, the physical condition of the animals was fair in nine and poor in seven cows. The most dominant clinical signs were reduced ruminal motility, inappetance and/or anorexia and recumbency. Postmortem examination, in seven cases, revealed enlarged liver (18-33kg), icteric carcasses and distended gallbladder. Laboratory results included neutrophilia, hypochloraemia, decreased concentrations of total bilirubin and increased concentrations of β-hydroxy butyric acid, non-esterified fatty acids and insulin. The activities of aspartate aminotransferase, γ-glutamyl transpeptidase, creatine kinase and lactate dehydrogenase were high. Histopathological examination of hepatic specimen showed lipid drops in cytosol with indistinct cellular membranes. In control hepatic cells, the DNA was tightly compressed and maintained the circular disposition of the normal nucleus. However, in the diseased cows, the damaged DNA migrated from the core toward the anode, forming a tail of a comet. Compared to controls, numerous ssDNA and caspase-3-positive cells were detected in the liver. To the authors' knowledge, this is the first study to document accelerated apoptosis of hepatocytes in dairy cows with fatty infiltration of the liver. 相似文献