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鸟氨酸脱羧酶抗酶1(OAZ1)基因可通过特殊的+1移码机制翻译全长的功能蛋白。研究发现,OAZ1能与鸟氨酸脱羧酶(ODC)结合并降解ODC,负调控细胞内多胺的水平;OAZ1还能降解Cyclin D1、Cyclin E1和Smad1周期蛋白,阻滞细胞周期;此外,近年来研究表明,OAZ1还具有抗肿瘤效应和调控动物繁殖的功能。抗酶抑制因子能竞争性结合ODC-OAZ1复合体中的OAZ1,从而阻止ODC降解;天门冬酰胺也能通过抑制OAZ1的翻译来调节ODC的活性。本文就OAZ1基因结构和功能的研究现状作一综述。 相似文献
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多胺跨膜物质转运的机制 总被引：1，自引：0，他引：1
多胺具有调控细胞增殖、分化和凋亡的功能,可参与动物繁殖、胚胎发育以及癌症发生发展等多种生物学过程。在动物机体中,多胺稳态是通过多胺跨膜物质转运和多胺代谢途径共同维持的。溶质转运蛋白(SLC)基因家族中的SLC3A2、SLC7A1、SLC12A8、SLC22A16、SLC22A 1、SLC22A 2、SLC22A 3基因及其编码的蛋白质可参与多胺的跨膜物质转运;多胺代谢关键调控基因鸟氨酸脱羧酶(ODC)、鸟氨酸脱羧酶抗酶(OAZ)和鸟氨酸脱羧酶抗酶抑制剂(AZIN)对多胺跨膜物质转运也具有重要的调控功能;此外,金属阳离子、细胞膜跨膜电位和p H等内环境因素也可参与多胺转运的调节。因此,本文就多胺转运蛋白、多胺代谢相关基因和蛋白质以及内环境因素调控多胺跨膜物质转运的分子调控机制作一综述,以期为阐明多胺转运调控机制的研究奠定理论基础。 相似文献
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为探究旋毛虫体内是否存在鸟氨酸依赖性抗酸系统(AR5)及旋毛虫鸟氨酸脱羧酶(TsODC)对旋毛虫抗酸能力的调控作用，本实验分别采用p H1.5、p H2.5、p H4.5、p H6.6的培养液以及PBS (pH7.4)作为对照组分别培养0.5 h、1 h和2 h后，通过统计旋毛虫肌幼虫的存活率、采用荧光定量PCR (qPCR)和western blot，分别筛选旋毛虫肌幼虫体外最适酸处理条件。结果显示，在酸度为p H2.5培养2 h时，肌幼虫的存活率为51%(此时死亡数与存活数基本相等)及Ts ODC基因的转录和表达水平最高。因此，p H2.5培养2 h为旋毛虫肌幼虫体外最佳酸处理条件。于培养液中分别添加不同浓度的精氨酸、Ts ODC多抗血清、姜黄素和雷帕霉素，以PBS作为对照组分别培养12 h、24 h和48 h后，采用上述最佳酸处理条件处理后，通过计算肌幼虫存活率，采用q PCR检测Ts ODC基因的转录水平并初步筛选不同制剂的最佳培养浓度及时间，并在各最佳浓度和时间培养后，再经最佳酸处理条件处理，采用western blot检测Ts ODC蛋白的表达，分析各制剂对旋毛虫抗酸能力的... 相似文献
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《畜牧兽医学报》2015,(10)
本研究旨在探讨BMP1基因对体外培养水牛颗粒细胞增殖与凋亡的影响,采用qRT-PCR检测体外培养0、24、48、72和96h水牛颗粒细胞中BMP1基因的表达规律,通过在水牛颗粒细胞培养液中添加BMP1基因重组蛋白和抗BMP1抗体,观察其对体外培养水牛颗粒细胞增殖变化的影响,并应用qRT-PCR和Western blotting方法检测与细胞增殖和细胞凋亡相关因子表达的变化规律。结果显示,随着颗粒细胞体外培养时间的延长,BMP1基因的相对表达量显著上调(P0.05),96h培养组BMP1表达最高。添加BMP1重组蛋白可显著促进水牛颗粒细胞的体外增殖(P0.05),并能够显著上调细胞周期关键蛋白Cyclin D1、Cyclin D2和PCNA mRNA表达水平(P0.05),同时显著抑制了细胞凋亡信号通路中促凋亡相关因子(Fas、FasL、TNFR1、TNF-α、Cytochrome C、Apaf1、Chop、Caspase-3、Caspase-8和Caspase-9)mRNA表达(P0.05)。Western blotting检测结果表明,BMP1重组蛋白能够抑制Fas、Bax和Caspase-9蛋白表达,蛋白与mRNA表达一致。而添加抗BMP1抗体的试验则得出相反的结果。综上表明,BMP1基因能通过调控相关基因的表达促进体外培养水牛颗粒细胞的增殖并抑制其凋亡,在水牛卵泡发生过程中具有重要的调控功能,为阐明BMP1基因参与家畜卵泡发生的分子机制奠定基础。 相似文献
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目的 检测高表达OAZI-1的小鼠黑素瘤B16-F1细胞对抗癌药物多胺类似物CPENSpm敏感性的影响并探讨其作用机制.方法 高表达OAZI-1的B16-F1细胞经CPENSpm处理后,MTT法检测细胞增殖;QT-RT-PCR检测细胞内OAZI-1、ODC和OAZ的mRNA表达水平;反相高效液相色谱法检测细胞内多胺含量;化学发光法分析细胞内SMO酶活性.结果 高表达OAZI-1显著增加B16-F1细胞对CPENSpm的敏感性,QT-RT-PCR结果 显示,OAZI-1高表达增加ODCmRNA但降低OAZ mRNA水平,CPENSpm处理对ODC和OAZ的mRNA水平无进一步影响.与对照细胞相比,CPENSpm处理能更显著性地降低OAZI-1高表达细胞中的多胺含量,同时更强地诱导SMO酶的活性.结论 CPENSpm处理能在更大程度上耗竭OAZI-1高表达的B16-F1细胞中的多胺,由此对该肿瘤细胞显示出更大的细胞毒性. 相似文献
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环状RNA(circularRNA,circRNA)是一类经反向剪接后、由3'末端和5'末端共价结合形成的环状非编码RNA(non-codingRNA,ncRNA)分子.这种非编码RNA具有组织表达特异性,因为有特殊的环状结构而不被RNA外切酶降解.随着RNA-seq在越来越多物种中的应用,circRNA的组学文章数量开始快速增长.研究结果表明,circRNA有以下五个生物学功能:与典型剪接发生竞争;充当miRNA分子的"海绵";调控基因的转录;与蛋白质结合,调控蛋白活性;翻译为蛋白质.circRNA的研究主要集中在人体医学方面,近年来,对各种家畜的研究也逐渐增多.本文综述了circRNA在羊、牛和猪生长发育方面的调控研究,以期为研究家畜组织中circRNA的功能提供理论依据与研究思路. 相似文献
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PCBP2促进口蹄疫病毒增殖的机制研究 总被引：1，自引：1，他引：0
多聚胞嘧啶结合蛋白2(PCBP2)是一个能特异性结合RNA和DNA Poly(C)片段的蛋白,具有维持mRNA稳定和调节翻译的功能;同时,PCBP2能负调控VISA介导的信号转导通路,抑制Ⅰ型干扰素(IFNs)的产生。前期研究表明,PCBP2能调节口蹄疫病毒(foot-and-mouth disease virus,FMDV)的增殖,但具体机制不清楚。作者对此进行了研究,发现:1)免疫共沉淀和GST pull-down试验证实,PCBP2能与FMDV结构蛋白VP0、VP2、2B、2C和3D相互作用;2)进一步用双荧光素酶报告系统试验证明,PCBP2负调控VISA介导的信号通路,并且2C、3D、VP0和2B促进PCBP2的负调控作用;3)通过Western blot试验表明,FMDV VP0蛋白能促进PCBP2对VISA的特异性降解。总之,PCBP2与FMDV VP0相互作用,促进PCBP2降解天然免疫接头蛋白VISA,抑制IFN-β的产生,从而有利于FMDV在细胞中的繁殖和生长。 相似文献
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采用盆栽试验方法研究了紫花苜蓿(品种:陇东) 叶片和根系中游离态腐胺(Put)、亚精胺(Spd)、精胺(Spm)及精氨酸脱羧酶(ADC)、鸟氨酸脱羧酶(ODC)、多胺氧化酶(PAO)活性的动态变化。结果表明,干旱胁迫下紫花苜蓿叶片和根系中的多胺含量增加,随着胁迫时间的延长, Put、Spd、Spm及ADC、ODC、PAO活性均呈先上升后下降的趋势,且随胁迫程度加重而增大。ADC、ODC活性与Put含量呈极显著正相关,参与了紫花苜蓿Put的合成代谢。PAO活性与Spd、Spm含量变化趋势相似且呈极显著相关关系,叶和根中多胺代谢显著相关,表明多胺代谢与紫花苜蓿抗旱性关系密切。 相似文献
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Rassnick KM Gieger TL Williams LE Ruslander DM Northrup NC Kristal O Myers NC Moore AS 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2001,15(3):196-199
1-(2-Chloroethyl)3-cyclohexyl-1-nitrosourea (CCNU) is an alkylating agent in the nitrosourea subclass. A prospective evaluation of CCNU was done to determine the maximally tolerated dosage of CCNU in tumor-bearing cats. Response data were obtained when available. Twenty-five cats were treated with CCNU at a dosage of 50-60 mg/m3 body surface area. Complete hematologic data were available for 13 cats. Neutropenia was the acute dose-limiting toxicity. The median neutrophil count at the nadir was 1,000 cells/microL (mean, 2,433 cells/microL; range, 0-9,694 cells/microL). The time of neutrophil nadir was variable, occurring 7-28 days after treatment, and counts sometimes did not return to normal for up to 14 days after the nadir. Based on these findings, a 6-week dosing interval and weekly hematologic monitoring after the 1st treatment with CCNU are recommended. The nadir of the platelet count may occur 14-21 days after treatment. The median platelet count at the nadir was 43,500 cells/microL. No gastrointestinal, renal, or hepatic toxicities were observed after a single CCNU treatment, and additional studies to evaluate the potential for cumulative toxicity should be performed. Five cats with lymphoma and 1 cat with mast cell tumor had measurable responses to CCNU. Phase II studies to evaluate antitumor activity should be completed with a dosing regimen of 50-60 mg/m3 every 6 weeks. 相似文献
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Davis MS Willard MD Nelson SL Mandsager RE McKiernan BS Mansell JK Lehenbauer TW 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2003,17(3):311-314
Human and equine athletes are reported to have a high prevalence of gastric disease, and anecdotal evidence suggests a similar phenomenon applies to racing sled dogs. To investigate the prevalence of gastric disease in racing sled dogs, we conducted 2 gastroscopy studies on dogs competing in the annual Iditarod Sled Dog Race. A pilot study of dogs that were either dropped from the 2000 Iditarod Sled Dog Race because of illness or that finished the race indicated that, approximately 5 days after competing, 10 of 28 dogs (35%) had endoscopic evidence of gastric ulceration, erosion, or hemorrhage. The next year, an endoscopic study of 73 dogs participating in the 2001 Iditarod race was performed in order to evaluate a larger population of dogs. Data from 70 of these dogs could be used; 34 (48.5%) had ulceration, erosion, gastric hemorrhage, or some combination of these findings. When this group of 70 dogs was compared retrospectively to a control group of 87 dogs presented to the Texas A&M University (TAMU) Veterinary Medical Teaching Hospital, the Iditarod sled dogs had a significantly higher prevalence (P = .049) of gastric lesions. These findings suggest that, similar to athletes of other species, elite canine athletes have an increased prevalence of gastric disease compared to the canine population at large. 相似文献
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Furosemide continuous rate infusion in the horse: evaluation of enhanced efficacy and reduced side effects 总被引：1，自引：0，他引：1
Johansson AM Gardner SY Levine JF Papich MG LaFevers DH Fuquay LR Reagan VH Atkins CE 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2003,17(6):887-895
Continuous rate infusion (CRI) of furosemide in humans is considered superior to intermittent administration (IA). This study examined whether furosemide CRI, compared with IA, would increase diuretic efficacy with decreased fluid and electrolyte fluctuations and activation of the renin-angiotensin-aldosterone system (RAAS) in the horse. Five mares were used in a crossover-design study. During a 24-hour period, each horse received a total of 3 mg/kg furosemide by either CRI (0.12 mg/kg/h preceded by a loading dose of 0.12 mg/kg IV) or IA (1 mg/kg IV q8h). There was not a statistically significant difference in urine volume over 24 hours between methods; however, urine volume was significantly greater after CRI compared with IA during the first 8 hours ([median 25th percentile, 75th percentile]: 9.6 L [8.9, 14.4] for CRI versus 5.9 L [5.3, 6.0] for IA). CRI produced a more uniform urine flow, decreased fluctuations in plasma volume, and suppressed renal concentrating ability throughout the infusion period. Potassium, Ca, and Cl excretion was greater during CRI than IA (1,133 mmol [1.110, 1,229] versus 764 mmol [709, 904], 102.7 mmol [96.0, 117.2] versus 73.3 mmol [65.0, 73.5], and 1,776 mmol [1,657, 2.378] versus 1,596 mmol [1,457, 1,767], respectively). Elimination half-lives of furosemide were 1.35 and 0.47 hours for CRI and IA, respectively. The area under the excretion rate curve was 1,285.7 and 184.2 mL x mg/mL for CRI and IA, respectively. Furosemide CRI (0.12 mg/kg/h) for 8 hours, preceded by a loading dose (0.12 mg/kg), is recommended when profound diuresis is needed acutely in horses. 相似文献
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Waruiru RM Thamsborg SM Nansen P Kyvsgaard NC Bogh HO Munyua WK Gathuma JM 《Tropical animal health and production》2001,33(3):173-187
The epidemiology of H. placei and of other gastrointestinal nematodes in yearling dairy cattle was examined on two farms in Kiambu District, central Kenya during each of 13 one-month periods from April 1993 to April 1994. On each farm, 32 newly weaned dairy calves were given a single dose of albendazole and then placed on experimental pastures. Twelve of the animals were designated for bi-monthly slaughter (n = 2) and analysis of worm population characteristics and 20 were designated for blood and faecal collection and for weighing. Two parasite-free tracer calves were grazed alongside the weaner calves each month throughout the study period and were also slaughtered for analysis of worm populations. Faecal egg counts, haematological and serum pepsinogen determinations, herbage larval counts, and animal live weight changes were recorded monthly. The study revealed that Haemonchus placei, Trichostrongylus axei, Cooperia spp. and Oesophagostomum radiatum were responsible for parasitic gastroenteritis and that H. placei was the predominant nematode present in the young cattle on both farms. Faecal egg counts from resident cattle and necropsy worm counts revealed that pasture larval levels were directly related to the amount of rainfall. The total worm burdens in the animals were highest during the rainy season (March–June and October–December) and lowest during the dry seasons (July–September and January–February). The very low recovery of immature larvae of H. placei from the tracer calves indicated that arrested development is not a feature of the life cycle of this parasite in central Kenya. The maintenance of the parasite population depended on continuous cycling of infection between the host and the pasture. The agroclimatic conditions of the study area were such that, in general, favourable weather conditions for the development and survival of the free-living stages of gastrointestinal nematodes existed all year round. 相似文献
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The occurrence of ectoparasites in sheep flocks is frequently reported but seldom quantified. Sheep production used to be a predominantly family activity in the state of Sa~o Paulo (Brazil), but it began to become a commercial activity in the past decade. Thus, information about the ectoparasites existing in sheep flocks has become necessary. The present data were obtained by means of questionnaires sent to all sheep breeders belonging to the `Associaça~o Paulista de Criadores de Ovinos' (ASPACO; Sa~o Paulo State Association of Sheep Breeders). Response reliability was tested by means of random visits paid to 10.6% of the respondents. Most of the properties (89.5%) reported the presence of one or more ectoparasites. Screw-worm (Cochliomyia hominivorax) was the most frequent ectoparasite (72.5%), followed by bot fly larvae (Dermatobia hominis, 45.0%), ticks (Amblyomma cajennense) and Boophilus microplus, 31.3%) and finally lice (Damalinia ovis, 13.8%). Combined infestations also occurred, the most common one being screw-worm with bot fly larvae (36.0%) followed by bot fly larvae with ticks (13.9%), screw-worm with ticks (9.3%), bot fly larvae with lice (6.9%), and ticks with lice (5.0%). The most common triple combination was screw-worm, bot fly larvae and ticks (12.8%). Breeds raised for meat or wool were attacked by bot fly larvae and ticks more often than other breeds. Lice were only absent from animals of indigenous breeds. The relationships among these ectoparasites are discussed in terms of sheep breeds, flock size, seasonality and the ectoparasitic combinations on the host. 相似文献
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Evaluation of biohydrogenation rate of canola vs. soya bean seeds as unsaturated fatty acids sources for ruminants in situ 
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下载免费PDF全文 S. Pashaei T. Ghoorchi A. Yamchi 《Journal of animal physiology and animal nutrition》2016,100(2):211-216
An experiment was conducted to study disappearance of C14 to C18 fatty acids, lag times and biohydrogenation (BH) rates of C18 fatty acids of ground soya bean and canola seeds in situ. Three ruminally fistulated Dallagh sheep were used to determine ruminal BH of unsaturated fatty acids (UFAs). Differences in the disappearance of fatty acids through the bags and lag times were observed between the oilseeds. We saw that the longer the incubation time of the oilseeds in the rumen, the lower the content of C18:2 and C18:3. Significantly higher lag times for both C18:2 and C18:3 were observed in ground canola compared to ground soya bean. BH rates of C18:2 and C18:3 fatty acids in soya bean were three times higher than those of canola. These results suggest that the fatty acid profile of fat source can affect the BH of UFAs by rumen micro‐organisms. So that UFAs of canola had higher ability to escape from ruminal BH. It seems that fatty acid profile of ruminant products is more affected by canola seed compared to soya bean seed. 相似文献
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Serum biochemical values and the wet weight to dry weight ratios of tissues were determined in yaks in Shandan county of Gansu province. The liver, kidney, heart and muscle contents of seven elements in yaks were also analysed. Most serum biochemical values were similar to those of cattle, camels and sheep, but the calcium concentration was considerably above the normal range for other ruminants. The liver contained the highest concentrations of copper, manganese and cobalt and the kidney of selenium, iron and calcium.Abbreviations Alb
albumin
- ALT
alanine aminotransferase
- AST
aspartate aminotransferase
- BUN
blood urea nitrogen
- Chol
cholesterol
- Glob
globulin
- -GT
-glutamyl transpeptidase
- IP
inorganic phosphorus
- TP
total protein 相似文献
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正We are pleased to publish the second special issue on avian brood parasitism and to be responsible guest editors for the two special issues of Chinese Birds (Vol. 3, No. 4, 2012 and Vol. 4, No. 1, 2013), entitled "Avian Brood Parasitism - A Growing Research Area in Behavioral Ecology". The first issue was published in December 2012. The goal of the two special issues is to publish accumulated knowledge and some of the recent developments in 相似文献
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Tropical Animal Health and Production - 相似文献