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1.
为评价羊口疮病毒(OrfV)B2L、F1L基因融合真核表达质粒pVAX1-B2L-F1L免疫小鼠诱导的体液和细胞免疫应答及IL-2对其免疫作用的影响。本研究将构建的pVAX1-B2L-F1L真核质粒转染MDBK细胞后,采用RT-PCR和间接免疫荧光试验(IFA)检测B2L-F1L融合基因在MDBK细胞中的表达;将pVAX1-B2L-F1L、pVAX1-B2L-F1L+pVAX1-IL-2、pVAX1空载体、生理盐水对照组KM系小鼠通过后腿肌肉注射的方式免疫,采用ELISA方法检测免疫小鼠血清中OrfV特异性抗体以及Th1型(IL-2、IFN-γ)、Th2型(IL-4、IL-6)细胞因子;MTT法检测小鼠脾淋巴细胞增殖反应。结果显示,pVAX1-B2L-F1L重组质粒能够在MDBK细胞中表达;pVAX1-B2L-F1L+pVAX1-IL-2联合免疫组小鼠血清抗体及IL-2和IFN-γ水平均显著高于pVAX1-B2L-F1L组;该联合免疫组小鼠血清IL-4、IL-6细胞因子水平与pVAX1-B2L-F1L组相比差异不显著(p>0.05);该联合免疫组小鼠的脾淋巴细胞增殖水平高于pVAX1-B2L-F1L组(p<0.05)。由此表明,pVAX1-B2L-F1L能够诱导小鼠产生OrfV特异性体液免疫和细胞免疫应答,联合pVAX1-IL-2诱导的免疫反应以细胞免疫应答为主,且能够促进Th1型细胞因子的分泌。本研究为OrfV基因工程疫苗的研制提供了参考依据。 相似文献
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构建羊口疮病毒F1L基因的真核表达质粒,并探讨其对小鼠的免疫原性。本试验采用PCR扩增pMD18TF1L克隆质粒的F1L基因并将其克隆至pVAX1载体中,构建真核表达质粒并转染至MDBK细胞,采用RT-PCR和间接免疫荧光检测F1L基因在MDBK细胞中的转录和表达。将构建的pVAX1-F1L、pVAX1空载体、PBS对照通过后腿肌肉注射的方式免疫KM系小鼠,通过间接ELISA、MTT和FACS法对该DNA疫苗的免疫效果进行评价。结果表明,成功构建了真核表达质粒pVAX1-F1L,并能在MDBK细胞中获得较高水平的表达。免疫小鼠后诱导的特异性抗体水平、脾淋巴细胞增殖反应、CD4~+、CD8~+细胞百分比和IL-2、IFN-γ、IL-4细胞因子水平均高于pVAX1组和PBS对照组。因此,制备的重组核酸疫苗免疫小鼠后能够诱导机体产生体液免疫和细胞免疫。 相似文献
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《中国预防兽医学报》2017,(8)
为评价羊白介素2(IL-2)基因和羊口疮病毒(OrfV)B2L基因真核表达重组质粒联合接种小鼠的免疫效果,本研究将pVAX1-B2L、pVAX1-B2L+pVAX1-IL-2及空载体pVAX1和PBS对照组通过肌肉注射的方式免疫KM小鼠,并采用ELISA方法和MTT方法检测免疫小鼠的体液和细胞免疫反应。结果表明,pVAX1-B2L+pVAX1-IL-2联合免疫组小鼠血清抗体效价和IL-2水平均显著高于pVAX1-B2L免疫组,与pVAX1和PBS对照组相比差异极显著(p0.01)。而且pVAX1-B2L+pVAX1-IL-2免疫组的脾淋巴细胞增殖水平高于pVAX1-B2L免疫组、空载体pVAX1组和PBS对照组(p0.01)。因此,pVAX1-B2L+pVAX1-IL-2联合免疫KM小鼠可以诱导特异性体液免疫和细胞免疫,并且IL-2具有免疫佐剂的作用,为进一步将其用于Orf的防制奠定了基础。 相似文献
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为了构建羊口疮病毒B2L和F1L基因融合真核表达质粒pVAX1-B2L-F1L,探讨制备安全可靠羊口疮病毒核酸双基因疫苗的可行性,试验通过Primer Premier 5.0软件设计B2L和F1L融合基因2对引物,应用SOE-PCR技术将B2L和F1L连接起来,用限制性内切酶消化后插入pVAX1真核表达载体中,构建B2L-F1L融合基因表达质粒,再转入大肠杆菌DH5α感受态细胞中,对真核表达质粒进行PCR鉴定、双酶切鉴定及序列测定。结果表明:利用SOE-PCR技术成功扩增出B2L-F1L融合基因;对真核表达质粒pVAX1-B2L-F1L进行PCR鉴定和双酶切鉴定后,均可得到与预期大小一致的DNA片段;测序发现,真核表达质粒目的基因序列与预期设计一致。说明真核表达质粒pVAX1-B2L-F1L构建成功。 相似文献
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为提高牛病毒性腹泻/粘膜病(BVD/MD)核酸疫苗的免疫效力,本实验应用PCR方法扩增BVD病毒(BVDV) E0基因,构建真核表达质粒pVAX1-E0,转染293T细胞,经RT-PCR和western blot分析显示,转染细胞能够瞬时表达E0蛋白.并分别将pVAX1、pVAX1-E0或将pVAX1-E0分别与一种表达细胞因子基因的重组质粒作为佐剂(pVAX1-IL-2、pVAX1-IL-4及pVAX1-IFN-γ)免疫小鼠,采用间接ELISA法检测免疫小鼠BVDV抗体效价,以MTT法检测免疫小鼠脾淋巴细胞的增殖活性.实验结果表明,与pVAX1-E0相比,接种pVAX1-E0/pVAX1-IL-2小鼠血清E0抗体水平及淋巴细胞增殖水平显著提高(p＜0.01),表明细胞因子基因佐剂IL-2能够有效提高BVDV E0核酸疫苗免疫效果,可以刺激小鼠产生良好的免疫应答. 相似文献
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《中国兽医学报》2019,(5):925-930
构建分子佐剂钙网蛋白Cal与弓形虫SAG1基因的真核表达载体,探讨其对小鼠的免疫原性。采用PCR扩增Cal和SAG1基因并将其克隆至Pvax1载体中,构建出重组质粒pVAX1-Cal-SAG1和pVAX1-SAG1。将构建质粒pVAX1-Cal-SAG1、pVAX1-SAG1同空载体pVAX1通过肌肉注射的方式免疫小鼠,通过ELISA、CCK-8法和小鼠攻虫试验对该DNA疫苗的免疫效果进行评价。结果显示:SAG1片段为855 bp,Cal-SAG1片段为1 566 bp,成功构建了真核表达质粒pVAX1-Cal-SAG1、pVAX1-SAG。小鼠免疫后pVAX1-Cal-SAG1诱导的特异性抗体水平、脾脏淋巴细胞增殖反应和IL-4、IL-10、IL-12 p70及IFN-γ细胞因子水平均高于pVAX1组、pVAX1-SAG1和空白对照PBS组。攻虫后,佐剂组小鼠存活时间最长,较空白对照组多存活5 d。本研究表明:制备的重组核酸疫苗免疫小鼠后能够诱导机体产生体液和细胞免疫,分子佐剂Cal可以显著地增强弓形虫表面膜蛋白SAG1的免疫原性。 相似文献
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《中国预防兽医学报》2017,(4)
为研究猪A组轮状病毒(PRV-A)血凝蛋白(VP4)、群抗原蛋白(VP6)和中和抗原蛋白(VP7)编码基因疫苗联合免疫的效力,本研究将表达PRV-AVP4、VP6、VP7蛋白基因的真核表达质粒pVAX1-VP4、pVAX1-VP6、pVAX1-VP7以pVAX1-VP4+pVAX1-VP7(B组)和pVAX1-VP4+p VAX1-VP6+pVAX1-VP7(A组)设计试验组,分别以100μg/只经肌肉注射途径免疫BLAL/c小鼠,间隔2周以相同剂量、途径加强免疫,共免疫3次,免疫后不同时间采血,采用ELISA检测血清抗体。结果显示,B组在免疫后14 d和42 d检测到RV抗体阳性(P/N≥2),A组在免疫后14 d、28 d、42 d均检测到RV抗体阳性(P/N≥2);脾脏免疫相关细胞测定结果表明,A组的CD4~+/CD8~+T淋巴细胞比值和CD19~+B细胞数量均高于B组,两组与对照组相比差异显著(p0.05);淋巴细胞转化试验显示A组的SI值均高于B组,并且42 d时A、B两组差异显著(p0.05)。上述结果表明,3组分联合免疫的DNA疫苗可以诱导小鼠产生较强的体液和细胞免疫应答,为PRV-A的核酸疫苗研究奠定了基础。 相似文献
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IL-18增强日本血吸虫DNA疫苗Sj23的免疫保护效果 总被引：3，自引：0，他引：3
将小鼠IL-18基因和日本血吸虫Sj23膜蛋白基因分别插入pVAX1载体,构建真核表达质粒pVAX/mIL-18和pVAX/Sj23,联合或单独免疫小鼠,以pVAX1空载体作对照,免疫2次,间隔2周,2次免疫后4周攻击日本血吸虫尾蚴.体液和细胞免疫检测结果表明,联合免疫组能诱导小鼠产生较强的抗日本血吸虫成虫可溶性抗原(SWAP)IgG,较高水平的IFN-γ和IL-2.攻虫试验表明,联合免疫小鼠成虫减虫率和肝脏减卵率分别达41.6%和49.4%,明显高于pVAX/Sj23单独免疫组(减虫率和肝脏减卵率分别为26.5%和41.4%).以上试验结果表明,IL-18能明显增强Sj23 DNA疫苗在小鼠体内的免疫应答,并且产生较强的保护作用. 相似文献
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《中国兽医学报》2017,(12)
旨在构建弓形虫磷脂酰苏氨酸合成酶(Toxoplasma gondii phosphatidylthreonine synthase,PTS)基因DNA疫苗,评价其抗弓形虫的免疫保护力。利用RT-PCR技术扩增得到弓形虫PTS基因,构建真核表达质粒pVAXTgPTS,然后转染HEK 293-T细胞,分析pVAX-TgPTS在细胞中的表达情况。利用真核表达质粒pVAX-TgPTS对BABL/c小鼠进行3次免疫,并用空质粒pVAX1作为对照,在每次免疫前和第3次免疫后2周收集小鼠血清,经ELISA方法检测小鼠血清中的IgG水平。第3次免疫后2周每组取3只小鼠,将其剖杀取脾脏,CCK-8法检测脾淋巴细胞增殖能力,流式细胞仪测定CD4+和CD8+T细胞百分比。小鼠脾细胞经STAg刺激后,利用ELISA试剂盒检测脾细胞细胞因子的表达情况。第3次免疫后2周,每只小鼠腹腔注射1 000个弓形虫RH株速殖子,观察记录小鼠的存活时间。结果显示,pVAX-TgPTS能够在HEK 293-T细胞中表达;第3次免疫后2周pVAX-TgPTS组血清中IgG含量相比对照组有了显著提高;pVAX-TgPTS组淋巴细胞刺激指数(SI)略微高于对照组;CD4+和CD8+T细胞百分比含量明显高于对照组;pVAX-TgPTS组中脾细胞经STAg刺激后能够明显提高IFN-γ的表达量。攻虫试验结果表明,pVAX-TgPTS组小鼠存活时间比对照组明显增长。本试验成功构建真核表达质粒pVAX-TgPTS,证明pVAX-TgPTS能够诱导小鼠产生一定的体液免疫和细胞免疫反应,并对弓形虫感染产生一定程度的免疫保护力,该研究结果为进一步研发弓形虫核酸疫苗奠定基础。 相似文献
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旨在开发防治热带螨过敏症的兽用核酸疫苗,本试验通过对热带无爪螨主要变应原Blo t 5和Blo t 21的基因序列进行密码子优化,构建了热带螨主要变应原融合基因的真核表达载体pVAX1-PADRE-Blo t 5-21-CpG。为验证该真核表达载体的免疫效果,采用皮下注射,以100 μg/100 μL量的pVAX1-PADRE-Blo t 5-21-CpG核酸免疫BALB/c小鼠(n=6),通过ELISA检测小鼠血清中特异性IgG、IgG1和IgG2a的水平变化;流式细胞术检测小鼠脾淋巴细胞中调节性T细胞的变化。结果显示,真核表达质粒pVAX1-PADRE-Blo t 5-21-CpG免疫小鼠后可诱导特异性IgG和IgG2a水平升高,且IgG2a/IgG1的比值升高,这暗示免疫后小鼠机体发生偏向Th1型的免疫反应。此外,该核酸疫苗可诱导小鼠产生较高水平的CD4+CD25+Foxp3+ T细胞,这表明该真核表达质粒免疫小鼠后可能会诱发免疫抑制。 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献
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乳酸杆菌作为益生菌广泛用于人和动物.本文综述了乳酸杆菌改善宿主健康的机制.乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道.文章重点讨论了乳酸杆菌表面成分(表面蛋白、脂磷壁酸和肽聚糖)与肠道受体(C型凝集素受体、Toll样受体和Nod样受体),阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制. 相似文献
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Billinghurst RC Brama PA van Weeren PR Knowlton MS McIlwraith CW 《American journal of veterinary research》2004,65(2):143-150
OBJECTIVE: To determine whether serum concentrations of biomarkers of skeletal metabolism can, in conjunction with radiographic evaluation, indicate severity of osteochondrosis in developing horses. ANIMALS: 43 Dutch Warmblood foals with varying severity of osteochondrosis. PROCEDURE: 24 foals were monitored for 5 months and 19 foals were monitored for 11 months. Monthly radiographs of femoropatellar-femorotibial and tibio-tarsal joints were graded for osteochondral abnormalities. Serial blood samples were assayed for 8 cartilage and bone biomarkers. At the end of the monitoring period, foals were examined for macroscopic osteochondrosis lesions. RESULTS: Temporal relationships were evident between certain serum biomarkers and osteochondrosis severity in foals during their first year. Biomarkers of collagen degradation (collagenase-generated neoepitopes of type-II collagen fragments, type-I and -II collagen fragments [COL2-3/4C(short)], and cross-linked telopeptide fragments of type-I collagen) and bone mineralization (osteocalcin) were positive indicators of osteochondrosis severity at 5 months of age. In foals with lesions at 11 months of age, osteochondrosis severity correlated negatively with COL2-3/4C(short) and osteocalcin and positively with C-propeptide of type-II procollagen (CPII), a collagen synthesis marker. Radiographic grading of osteochondrosis lesions significantly correlated with macroscopic osteochondrosis severity score at both ages and was strongest when combined with osteocalcin at 5 months and CPII at 11 months. CONCLUSIONS AND CLINICAL RELEVANCE: The ability of serum biomarkers to indicate osteochondrosis severity appears to depend on stage of disease and is strengthened with radiography. In older foals with more permanent lesions, osteochondrosis severity is significantly related to biomarker concentrations of decreased bone formation and increased cartilage synthesis. 相似文献