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AIM:To investigate the mechanisms by which bilirubin inhibits acute lung injury (ALI). METHODS:30 female Wistar rats were divided into normal group, ALI group and bilirubin treatment group. ALI was induced by intravenous injection of LPS. The contents of OH-, H2O2 and O2· in the lung as well as the expression of caspase-3 in the lungs were investigated. RESULTS:(1) The contents of OH-, H2O2 and O2· in the lung homogenate and the expression of caspase-3 in the lungs in ALI group increased compared with those in normal group (P<0.05). (2) The contents of OH-, H2O2 and O2· in the lung homogenate and the expression of caspase-3 in the lungs in bilirubin treatment group increased compared with those in normal group, but decreased compared with those in ALI models (P<0.05). CONCLUSION:(1) Bilirubin was shown to be able to ameliorate apoptosis in ALI rats. (2) The increase in the contents of OH-, H2O2, O2· in ALI group indicated the development of oxidative lung injury, which was ameliorated by bilirubin. (3) Expression of caspase-3 confirmed that the model made by LPS was associated with apoptosis, which was reduced by bilirubin. 相似文献
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[目的]为了获得B.bipolaris HD-1胆红素氧化酶纯品,确定酶的同源性及其常规酶学性质.[方法]将B.bipolaris HD-1发酵液依次通过硫酸铵盐析、阴离子交换层析和凝胶过滤层析确定蛋白的纯度、浓度和酶活力;通过基质辅助激光解析电离飞行时间质谱（MALDI-TOF）法获得氨基酸序列,并利用Mascot软件在NCBI蛋白库中的比对,以确定同源蛋白来源;用SDS-PAGE方法测其表观分子量;用等电聚焦方法测定等电点;用Linwerver-Burk双倒数作图法测定米氏常数;并对该酶的酶学性质进行了常规的测定.[结果]获得具有胆红素氧化酶酶活性的电泳纯单体蛋白,酶活为46 000 U/L,比活为1.15 U/mg;MALDI-TOF共获得135个氨基酸,该蛋白与来源于Hel-minthosporium tritici-vulgaris的漆酶前体蛋白序列同源性达100％;蛋白的表观分子量为68 kDa;pI为4.1;它对ABTS和胆红素的米氏常数分别为Km（ABTS） =1.8×10-5 mol/L（pH 3.0）和Km（bilirnbin）=2.7×10-5 mol/L（pH 7.5）;对胆红素的最适催化活性为36℃,酶在-40℃下可保持2年,酶活保持在90％以上,在pH 8 ～9.5下可保持相当高的催化胆红素活性,能够耐受高浓度的硝酸钠和尿素,低浓度的叠氮化钠对酶活有促进作用而高浓度则抑制,对氯化钠、溶解氧敏感.[结论]该蛋白具有典型的胆红素氧化酶特性,又存在明显的不同. 相似文献
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Gardner RB Nydam DV Mohammed HO Ducharme NG Divers TJ 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2005,19(5):761-764
The purpose of this study was to test the hypothesis that horses with right dorsal displacement of the large colon (RDDLC) have elevations in serum gamma glutamyl transferase (GGT) activity when compared with horses with left dorsal displacement of the large colon (LDDLC). Medical records from 37 horses with RDDLC and 48 horses with LDDLC were reviewed. Horses were included for study if the RDDLC or LDDLC was confirmed by exploratory laparotomy or postmortem examination and if a serum GGT measurement was obtained within 24 hours before surgery. The proportion of horses with GGT activity within or above the reference range was determined. Of 37 horses, 18 (49%; exact binomial 95% confidence interval, 32-66%) with RDDLC and, of 48 horses, 1 (2%; 95% CI, 0-11%) with LDDLC had GGT above the reference range. Horses with RDDLC had higher serum GGT than did horses with LDDLC. Of 37 horses, 36 (97%) with RDDLC were discharged with a good prognosis and none returned as a result of hepatic disease. Evaluation of surgical and postmortem examinations revealed that positioning of the colon in horses with RDDLC results in compression of the bile duct, which can cause extrahepatic bile duct obstruction and a subsequent elevation in serum GGT activity. 相似文献
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为改善胆红素氧化酶性质,提高酶的使用效率,以海藻酸钠为载体,采用包埋法固定了胆红素氧化酶,并优化了固定化条件,研究了固定化胆红素氧化酶的酶学性质.结果表明:海藻酸钠的质量浓度为0.10 g·mL-1、CaCl,浓度为0.20 mol·L-1、固定时间为1 h、酶的固定化效果最好,固定化酶的平均酶活力回收率达32%,固定... 相似文献
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猪胆囊造瘘的引流效果和胆盐对其影响作用的初探 总被引：1，自引：0，他引：1
本研究探讨了猪胆囊造瘘的新术部确定方法.采用这种方法先后对53头猪成功地进行了胆囊造瘘术,并对胆汁引流特点及胆红素含量进行了观测.胆汁的引流量随猪的不同个体及距手术完成的时间长短而显现差异.引流量的变化趋势是随时间的推移而逐渐下降的,术后1～5天为引流的高峰期.胆汁引流量于每日6、12和18点时出现三次峰值,并都与饲喂时间吻合.引流的肝胆汁中胆红素含量低于胆囊胆汁.引流期中肝胆汁的胆红素含量不随引流时期变化.补饲胆盐的试验组胆汁引流量极明显地高于对照组(P<0.01),并基本呈稳定上升趋势,引流第20～30天达最高峰,而对照组引流量在前5天为最高峰.补饲胆盐可促进食欲,因而增长了体重(P<0.05)和耗料(P<0.05). 相似文献
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[目的]分离与鉴定1株产胆红素氧化酶的新菌株.[方法]利用常规的微生物分离培养技术,从玉米叶片的病斑中分离出一株产胆红索氧化酶（bilirubin oxidase,BOD）的丝状真菌.[结果]通过形态学、生理学和rDNA-ITS（登录号为JN251106）序列分析,该菌株被鉴定为Bipolaris australiensis,命名为B.australiensis HD-1,属子囊菌门格孢腔菌目格孢腔菌科平脐蠕孢属澳大利亚平脐蠕孢霉（B.amtraliensis）,亦称澳洲双孢霉,是1株没有被报道过的具有产BOD的新产生菌;在不合任何诱导剂的发酵液中28℃,150 r/min,培养6d,其酶活可达为1 000 U/L.[结论]该方法成功分离出1株产胆红素氧化酶的新菌株,为BOD的产生菌提供了新的微生物来源. 相似文献
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Bridget C. Garner Heather Priest Jo Smith 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》2014,43(2):266-269
A 10‐year‐old spayed female Miniature Poodle was presented to the University of Georgia veterinary teaching hospital for evaluation of lethargy, vomiting and anorexia of 4 days' duration. Physical examination, history and a minimum database led to a diagnosis of immune‐mediated hemolytic anemia accompanied by marked hyperbilirubinemia. Refractometric protein determination was within the reference interval, whereas the biuret method indicated hypoproteinemia. This discrepancy was attributed to interference of bilirubin and biliverdin with the spectrophotometric read‐out of the biuret total protein assay. The albumin concentration, determined by bromcresol green, and refractometric total protein were less affected by this interference. 相似文献
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