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鸡γ-干扰素基因的分子克隆与序列测定 总被引：7，自引：0，他引：7
应用逆转录 -聚合酶链式反应 ( RT-PCR)技术 ,从 Con A诱导培养 2 4 h的鸡脾淋巴细胞中扩增得到了大小约 50 0 bp的基因 ,将其平端连接到 p UC1 9质粒上 ,进行质粒 PCR和 Eco RI、Hind 双酶切鉴定后 ,筛选阳性重组克隆。序列分析表明 ,该基因阅读开放框架由 4 92个核苷酸组成 ,与马和人γ-干扰素基因序列的同源性分别为 3 5%和 3 2 %,与鸡 型干扰素基因的同源性仅为 1 5%,与国外报道的鸡 γ-干扰素基因序列完全一致。表明鸡脾淋巴细胞受到有丝分裂原刺激后 ,其 γ-干扰素基因 m RNA发生了表达 ,试验成功地克隆得到了鸡 γ-干扰素基因 相似文献
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提取经植物血凝素诱导培养的梅花鹿外周血淋巴细胞总RNA,应用RT-PCR方法扩增出梅花鹿γ-干扰素成熟蛋白基因,经克隆测序表明与GenBank上发表的干扰素序列同源性为100%。将其重组到含有CMV增强子的真核表达载体质粒pCI-neo上。利用磷酸钙介导转染法将重组载体质粒pCI-neo-CerIFN-γ转染入中国仓鼠肾细胞(BHK-21)和牛肾细胞(MDBK)中,在G418抗性压力下进行筛选培养获得了稳定分泌表达的转染细胞系。通过Western blotting检测确定表达产物的相对分子质量分别为23、20、16ku,与预测大小一致。本研究成果为进一步开发梅花鹿生物制品类治疗制剂奠定了基础。 相似文献
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参照Digby 发表的鸡γ-干扰素的核苷酸序列,设计1对引物,应用反转录聚合酶链式反应(RT-PCR)技术,从Con A诱导过的鸡脾淋巴细胞中特异性的扩增出大小约为 500 bp的基因片段。将该扩增基因进行克隆测序,结果表明其序列与Digby报道的CHIFN-γ基因序列的同源性达100%。将该基因插入原核表达载体pGEX-4T-1中构建成重组表达载体pGEX-CHIFN-γ,并将其导入大肠杆菌BL21中,诱导表达的重组蛋白经 SDS-PAGE 分析分子质量约为 43 ku,表明所克隆的CHIFN-γ 基因在原核细胞中得到表达。 相似文献
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为探讨鸡p15基因的生物学功能,试验构建了鸡p15基因的真核表达载体pcDNA3.1( )-p15,并转染到鸡MDV转化的淋巴细胞系MDCC-MSB1,应用G418筛选掉未转染的细胞,对存活细胞p15蛋白的表达、细胞增殖力、群体倍增时间、细胞周期和端粒酶的活性进行了检测。结果表明,与转染空质粒pcDNA3.1( )细胞相比,转染了p15基因的细胞稳定表达了p15蛋白;细胞的增殖受到了抑制,抑制率达45%～74%;群体倍增时间从27h延长至416h;流式细胞仪分析细胞周期发现,p15蛋白引起了细胞多停滞于G0/G1期,S和G2/M期细胞比例下降;端粒酶活性受到抑制。 相似文献
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猪γ干扰素的克隆与序列分析及腺病毒表达载体的构建 总被引：1，自引：1，他引：0
提取猪脾脏淋巴细胞中总RNA,应用RT-PCR技术扩增出γ-干扰素基因,将其克隆到pGEM-T载体上,并进行测序。结果表明,克隆获得的γ-干扰素基因全长为517个碱基,ORF为501个碱基,编码166个氨基酸。与GenBank上已发表的猪γ-干扰素基因的核苷酸同源性均为100%,并且在氨基酸水平上也完全一致。将目的基因插入腺病毒穿梭质粒pAd-Shuttle-CMV载体中,构建出真核表达载体pAd-Shuttle-CMV-IFNγ-,在BJ5183细菌中同源重组,构建出腺病毒表达载体pAdenoγ-,为进一步研究γ-干扰素在腺病毒中的表达、检测其生物学活性奠定基础。 相似文献
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应用RT-PCR方法从鸡传染性法氏囊病病毒(IBDV)JS株中扩增出VP2基因,并克隆入T-easy载体。序列测定分析结果表明IBDVJS株的VP2基因与国际标准强毒株的核苷酸序列同源性达98%,氨基酸序列同源性达99%以上。随后将VP2基因克隆入真核表达载体pcDNA3.1/zeo( ),构建成功真核表达质粒pcD-VP2,pcD-VP2体外转染COS-1细胞,能在COS-1细胞中表达。利用pcD-VP2质粒进行动物实验,结果表明雏鸡免疫14d后在体内可检测到特异性抗体,pcD-VP2的真核表达质粒二次免疫诱导鸡产生对IBDV强毒攻击的保护率为67%,这一结果提示VP2基因具有重要开发应用价值。 相似文献
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梅花鹿γ干扰素克隆表达及抗病毒活性测定 总被引：1，自引：1，他引：1
提取经植物血凝素诱导培养的梅花鹿外周血淋巴细胞总RNA,应用RT-PCR方法扩增出梅花鹿γ干扰素成熟蛋白基因并将其克隆到pMD18-T载体上,测序结果表明,扩增片段为梅花鹿γ干扰素成熟蛋白序列,与GenBank上发表的干扰素序列同源性为100%.将其重组到原核表达载体pET32a(+)上,并在大肠埃希菌BL21中实现了高效表达.表达产物以His-Tag融合蛋白的形式存在,表达量约占细菌总蛋白的32.6%.用镍亲和层析法对蛋白进行纯化,并利用VSV-MDBK/IBRV细胞系统分析其生物活性,重组梅花鹿γ干扰素抗病毒活性分别约为7.25×104 U/mL和4.61×104 U/mL.结果表明,重组梅花鹿γ干扰素特异性好,而且抗病毒活性比较稳定. 相似文献
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应用RT-PCR技术从经植物血凝素(PHA)刺激诱导的奶牛脾脏淋巴细胞总RNA中扩增出牛-γ干扰素基因(bovine interferon-γ,BovIFN-γ)cDNA,并克隆到pGEM-T easy载体中,经过限制性酶切分析和测序证实,所克隆到的基因编码区序列与已报道的序列完全一致.将含信号肽的BoIFN-γ基因整个编码区cDNA亚克隆到杆状病毒转座载体pFastBac Ⅰ中,构建了转移载体pFastBac 1-BoIFN-γ,转座到宿主菌DH10 Bac中,在含庆大霉素、四环素、卡那霉素、IPTG和X-gal的KGTIX LB平板上筛选白色菌落,提取DNA获得重组穿梭载体Bacmid-BoIFN-γ质粒,与脂质体共转染Sf9细胞,产生有感染力的重组杆状病毒reBac-BoIFN-γ.重组病毒经过传代扩增感染Sf9细胞,通过IFA试验、Western-blot和抗病毒活性测定证实,BoIFN-γ基因在感染的昆虫细胞和上清中得到了表达,上清中活性可达2.651×105U/mL.表达条件优化结果表明,不同MOI对rBoIFN-γ的表达产量影响不大,上清中干扰素活性在感染后5 d达到高峰. 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