氯气中毒对小鼠主要脏器水通道蛋白4表达的影响

以昆明小鼠为研究对象,探讨氯气中毒对小鼠主要脏器(心、肝、脾、肺、肾和脑)水通道蛋白4表达的影响.将40只30日龄昆明小鼠随机分为试验组和对照组,用氯气诱发中毒性肺水肿模型,剖检观察各脏器病理变化.并运用免疫组化法(SABC)检测各脏器中水通道蛋白4的表达.结果显示试验组出现肺水肿的临床症状,除肝脏外其他脏器水通道蛋白4的表达明显高于对照组(P<0.01),HE染色见水肿典型病变.结论得出氯气中毒致使小鼠主要脏器的水通道蛋白4的表达上升,这可能与水通道蛋白4的转运水的功能直接有关.     

水通道蛋白AQP3缺失对小鼠坐骨神经损伤修复的影响

为探明水通道蛋白AQP3缺失对小鼠坐骨神经损伤修复能力的影响,本文通过建立小鼠坐骨神经损伤修复模型,分别比较了野生型(AQP3+/+)和基因敲除(AQP3-/-)小鼠的坐骨神经功能指数(SFI)、神经传导速率及雪旺细胞的迁移能力。结果显示,同野生型小鼠相比,AQP3基因敲除小鼠的SFI在损伤后7 d和14 d时呈现显示性差异,神经传导速率显著降低。细胞穿孔试验表明,AQP3基因敲除小鼠同野生型小鼠相比雪旺细胞迁移能力也显著降低。研究结果表明,AQP3的缺失可导致小鼠雪旺细胞的迁移能力降低,从而影响了小鼠坐骨神经损伤后的修复能力。     

水通道蛋白7和8在牛早期胚胎发育过程中的表达规律

以牛卵母细胞为研究对象,体外成熟后孤雌激活,收集各个时期的卵母细胞和不同发育阶段的早期胚胎,提取总RNA。根据GenBank公布的mRNA序列设计引物,进行RT-qPCR,检测不同阶段AQP7与AQP8的时空表达规律,结果表明:AQP7与AQP8在不同时期卵母细胞和早期胚胎中具有相似的表达规律,在8Cell达到峰值,而到16Cell期表达量均有显著下降。在牛早期胚胎发育阻滞期(8-16Cell期),胚胎发育由母源基因主导调控转向依赖合子自身遗传物质,这期间AQP7与AQP8表达变化说明其在转变过程中具有重要作用,本试验为AQP7与AQP8在牛早期胚胎发育过程中的功能研究奠定基础。     

水通道蛋白研究进展

水通道蛋白是专门运输水的跨膜蛋白,其基因结构、基因表达调控、染色体定位、蛋白质结构、组织分布和生理功能得到了较为深入的研究。作者从水通道蛋白的发现,水通道蛋白的分子结构、分类、分布和生理功能及水通道蛋白的研究展望作一综述。     

水通道蛋白在调节肠道健康中的作用

水通道蛋白是一类可以高效选择性转运水分子的细胞膜通道蛋白,广泛分布于人和哺乳动物的胃肠道组织中,在机体液体转运和消化生理中发挥重要作用。本文总结了水通道蛋白的结构、分类及其在人、鼠类和仔猪胃肠道系统的表达和分布情况,并阐述了水通道蛋白与腹泻、肠上皮细胞迁移与修复、肠道屏障功能和肠道炎症相关疾病等过程的关系及其作用。     

水通道蛋白在动物疾病发生过程中的作用研究进展

水通道蛋白(AQP)是细胞上存在的一种膜孔道蛋白.动物、植物、微生物细胞上均有水通道蛋白的表达,其主要功能是参与机体的水与电解质代谢.近年来,针对水通道蛋白在机体所发挥的功能方面研究较多,发现水通道蛋白不仅参与机体生理方面的调控,而且在一些疾病的发生发展过程中也发挥重要的作用.综述概括了水通道蛋白在脑、肺、肾脏、肠道等...     

水牛水通道蛋白9基因克隆及其表达分析

本研究旨在对水牛水通道蛋白9 (aquaporins 9,AQP9) 基因进行克隆,并对其在水牛不同组织中的表达规律及其在水牛卵巢和睾丸组织中的表达差异进行探索。根据GenBank上黄牛AQP9基因序列(登录号:NM_001205833.1)设计特异性引物,以水牛睾丸组织cDNA为模板,应用RT-PCR方法扩增AQP9基因编码区片段;运用生物信息学方法分析其核苷酸序列的保守性和氨基酸的理化性质;应用实时荧光定量PCR技术分析AQP9基因在水牛组织中的表达情况;免疫组织化学方法分析AQP9蛋白在不同发育阶段水牛卵泡及睾丸组织中的表达差异。结果表明,克隆获得了888 bp的水牛AQP9基因编码区序列,其编码295个氨基酸。多重序列比较显示,水牛AQP9核苷酸序列与牛、猪、绵羊和人相应序列相似性分别为99%、90%、97%、88%;氨基酸序列的同源性分别为99%、86%、97%、83%,系统进化树分析结果推测,AQP9基因在物种进化过程中具有高度保守性。实时荧光定量PCR结果显示,AQP9基因在水牛肝脏、肺脏、大脑、皮肤、睾丸和卵巢组织中有不同程度的表达,在肝脏组织中表达最高,皮肤和睾丸次之,肺脏和卵巢表达较低。免疫组化结果显示,在卵巢组织中,AQP9蛋白表达随卵泡发育时期的不同而变化,并随着卵泡发育其表达逐渐增强;在睾丸组织中,AQP9蛋白在各级精母细胞和间质细胞中均有表达。结果提示,成功克隆得到水牛AQP9基因序列;AQP9在水牛卵巢和睾丸中的表达及其功能可能与水牛卵泡发育和精子发生有重要的关联。     

水通道蛋白与胃肠道疾病关系研究进展

水通道蛋白作为一种高度水透性的膜蛋白,广泛存在于动、植物的细胞膜上。它不仅对机体的水平衡具有重要的作用,而且临床许多疾病的发生都与它的异常表达密切相关,因此,论文就水通道蛋白在胃肠道中的分布及与胃肠道疾病的关系做一综述,以期为防治胃肠道疾病药物的发展提供参考。     

水通道蛋白9的研究进展

水通道蛋白9在机体内许多器官组织中表达,它对水、尿素、甘油等分子均有通透性,其基因结构、染色体定位、蛋白质结构、组织分布和生理功能也已得到了较为深入的研究。本文对水通道蛋白9基因的结构特点、分子结构、分布和生理功能作一综述,以期为相关疾病诊治和生产实践提供理论依据。     

钙激活氯通道蛋白ANO1在小鼠主动脉平滑肌细胞的表达及其功能鉴定

探讨钙激活氯通道蛋白ANO1在C57BL/6小鼠主动脉平滑肌细胞中的表达及其功能特性。运用胶原酶消化法获得原代培养的小鼠主动脉平滑肌细胞,流式细胞术检测平滑肌细胞纯度;应用RT-PCR检测主动脉平滑肌细胞ANO1 mRNA的表达;免疫印迹检测ANO1蛋白在主动脉平滑肌细胞的表达情况;应用荧光淬灭动力学实验检测ANO1钙激活氯通道的功能特性。原代培养成功获得主动脉平滑肌细胞;RT-PCR结果分析表明,主动脉平滑肌细胞在mRNA水平有ANO1表达;免疫印迹显示主动脉平滑肌细胞蛋白水平有ANO1表达;荧光淬灭动力学实验证实表达在主动脉平滑肌细胞的ANO1具有阴离子转运功能,即钙激活氯通道典型特性。小鼠主动脉平滑肌细胞表达的ANO1是钙激活氯通道的分子基础。     

Localization and migration of benzimidazole resistant and susceptible adult Cooperia curticei in the small intestine of sheep after treatment with thiabendazole

Four groups of three lambs per group were experimentally infected with Cooperia curticei susceptible (two groups) or resistant (two groups) to benzimidazoles, and distributions of adult worms in the small intestine were studied. For each Cooperia isolate, one group was treated with thiabendazole (TBZ) (5 or 50mg/kg bodyweight) 28 days after infection. In the two untreated groups, the population of C. curticei were present from the second to the tenth meter of intestine from the pylorus with a maximum in the sixth meter for both isolates. After treatment with TBZ, the size of the resistant worm population did not significantly decrease but a large number of worms were found towards the proximal sections of the intestine. In contrast, the susceptible population was reduced by about 40% but the surviving worms remained at this same site of predilection after treatment. Measurements of the concentration of TBZ and 5OH-thiabendazole (5OH-TBZ) in the intestinal segments do not indicate a clear relationship between the localization of worms and TBZ or 5OH-TBZ concentrations at least 12h after the anthelmintic treatment. The hypothesis of an enhanced expression of the mechanisms of resistance in the first few meters of small intestine is suggested.     

Surgery of the bovine small intestine

Cattle require surgery for small-intestinal problems less frequently than they do for abomasal, forestomach, or large-intestinal problems. Close attention to local vascular anatomy is critical to success when intestinal resection is required. Cows with signs of severe abdominal pain may make rapid recoveries following prompt surgical treatment. This article discusses relevant anatomy of the small intestine and the diagnosis and treatment of intussusception, volvulus, obstruction by incarceration or entrapment, and duodenal obstruction.     

Granular mucosal lymphocytes in porcine small intestine

A subpopulation of purified, interepithelial lymphocytes from porcine small intestinal mucosa contained cytoplasmic granules. Toluidine blue staining revealed metachromatic granules in 13.64% (606/4,450) cells. The cells had scant organelles, a single large nucleus with obvious invagination of the nuclear membrane, and prominent chromatin. Each cell contained 1 to 10 cytoplasmic membrane-bound granules, 0.6 to 1.5 micron in diameter. These findings indicated that the granular mucosal lymphocytes are related morphologically to mucosal mast cells. The presence of serotonin in the granules, confirmed by the serotonin releasing test, provided functional evidence that granular mucosal lymphocytes are related to mucosal mast cells.     

Survival after small intestine resection and anastomosis in horses

The authors examined factors influencing survival in 140 horses that recovered from anesthesia after small intestinal resection between 1968 and 1986, using Kaplan-Meier estimated survival curves and the Cox proportional hazards regression model. Seventy-two horses (51%) died during the initial postoperative period, 19 horses (14%) died after discharge from the hospital, 33 horses (24%) were alive, and 16 horses (11%) were classified as censored. Mean age at surgery was 8 years. Horses 15 years of age or older, Arabians and Stallions, were overrepresented in the hospital population. The most common reason for resection was strangulation of bowel through a mesenteric rent. The mean and 50% median survival times were 1540 and 27 days, respectively. Horses admitted after January 1, 1980, had a significantly longer survival than those admitted before that time. Survival was longer after anastomosis of two small intestinal segments than after anastomosis of a small intestinal segment to the cecum; however, the length of bowel resected and the method of anastomosis had no demonstrable influence on survival. Of the variables studied, the heart rates at presentation and 24 hours after surgery were the most accurate predictors of survival.