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《畜牧与兽医》2018,(12)
为了制备H5N6亚型禽流感病毒(AIV)的单克隆抗体(MAb),采用纯化的H5N6 AIV免疫BALB/c鼠,利用淋巴细胞杂交瘤技术制备杂交瘤细胞,通过间接ELISA方法进行筛选,获得2株能稳定分泌抗NP蛋白的杂交瘤细胞,分别命名为3D9和2B10。间接ELISA检测2株杂交瘤细胞培养上清液抗体效价分别为1∶1×10~3和1∶1×10~4,腹水的抗体效价分别达到1∶1×10~5和1∶1×10~6; 3D9和2B10亚类鉴定重链为IgM,轻链为κ链; Western blot分析表明,2株杂交瘤细胞上清均能与不同的AIV感染的尿囊液在56 kD处发生特异性反应,并能与原核表达的重组NP蛋白发生特异性反应;间接免疫荧光试验显示,2株单克隆抗体均能与不同的AIV感染的MDCK细胞产生特异性反应。以上结果表明,本研究针对H5N6 AIV的NP蛋白制备了2株单克隆抗体,且都具有较好的特异性、保守性和广谱性,为今后禽流感诊断方法的开发奠定了基础。 相似文献
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为了制备牛初乳免疫球蛋白IgG单克隆抗体,试验利用标准IgG蛋白作为免疫原,免疫6周龄Balb/c雌性小鼠,运用淋巴细胞杂交瘤技术,通过间接ELISA法筛选,采用有限稀释法,经过3次克隆筛选,获得2株稳定分泌抗IgG蛋白的杂交瘤细胞株,分别命名为E7和D9,并进行了亚类鉴定。结果表明:该杂交瘤细胞培养上清液抗体效价抗体效价E7为1∶3.01×103,D9为1∶5.24×104;腹水抗体效价E7为1∶2.52×105,D9为1∶7.01×106;E7和D9分泌的单克隆抗体均为IgG1型,轻链为λ链抗体。 相似文献
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《中国预防兽医学报》2017,(2)
为制备抗猪伪狂犬病病毒(PRV)糖蛋白E(gE)的单克隆抗体(MAb)并鉴定其抗原表位,本研究以原核系统表达PRV HeN1株截短的gE(aa127~aa232)蛋白(rgE),并对表达的rgE进行纯化免疫BALB/c小鼠,取其脾细胞与骨髓瘤细胞(SP2/0)进行融合,以该病毒感染的Vero E6细胞及真核表达的gE蛋白为检测抗原,采用IFA检测方法筛选杂交瘤细胞系,获得一株稳定分泌抗PRV gE的MAb杂交瘤细胞系(mgE185)。该MAb亚型鉴定为Ig G1型,轻链为Κ链。该MAb不具有中和病毒的活性,其细胞培养上清及腹水IFA效价分别为1∶80和1∶2 560。Western blot试验显示mgE185可以特异性识别gE蛋白,表明其针对的抗原表位为线性表位。通过截短表达gE蛋白鉴定该MAb的抗原识别序列为~(151)IGDYL~(155),该抗原表位在PRV中高度保守。本研究制备的MAb为进一步建立特异性强、灵敏度高的PRV gE-ELISA检测方法奠定了基础。 相似文献
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为制备抗犬瘟热病毒(CDV)血凝素蛋白的单克隆抗体,以CDV弱毒株Onderstepoort免疫Balb/c小鼠,取其脾细胞与骨髓瘤细胞SP2/0进行融合制备杂交瘤细胞。用昆虫杆状病毒表达系统表达的血凝素蛋白作为ELISA包被抗原,进行杂交瘤细胞筛选,获得3株阳性杂交瘤细胞株,分别命名3A8、3E4和1C7。经鉴定,抗体均为IgG1亚型,轻链为kappa链。杂交瘤细胞培养上清中抗体效价为1∶64~1∶256,腹水中抗体效价为1∶10~5~1∶10~7,病毒中和试验表明,3E4对CDV具有中和活性,腹水中抗体中和效价为1∶512。制备的单克隆抗体为CDV感染动物的治疗和基因工程抗体的开发奠定了基础。 相似文献
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为获得分泌抗禽网状内皮增生症病毒单克隆抗体的杂交瘤细胞,通过表达pET32a-gp90重组蛋白,以纯化的gp90蛋白为抗原,免疫BALB/c鼠,筛选分泌抗REV McAb的杂交瘤细胞株.经过细胞的融合及筛选,共获得能稳定分泌抗REV gp90的McAb细胞系2株,分别命名为A9E8和B3F8.2株细胞培养上清的效价均在1:4×102以上,腹水效价均在1∶8×103以上.亚型鉴定结果表明,2株皆为IgG型,轻链均为k链;Western blot及间接免疫荧光结果显示,这2株杂交瘤细胞分泌的单克隆抗体均能识别REV全病毒抗原,与其发生特异性反应,并且不与禽类其他病毒发生反应;病毒中和试验结果表明,获得的单克隆抗体均能REV临床分离株发生中和反应,具有较好的中和活性.利用制备的单克隆抗体建立了REV的间接免疫荧光检测方法,临床病料检测结果表明,该方法与病毒分离及PCR的检测结果基本一致,阴、阳性符合率分别为100％和90％.作者制备了针对REV gp90的McAb,为REV的快速诊断及抗原表位分析与鉴定等奠定了基础. 相似文献
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为制备牛传染性鼻气管炎病毒(IBRV)gD蛋白单克隆抗体,并对其免疫学特性进行分析与鉴定。用CHO细胞表达的IBRV-gD蛋白作为免疫原免疫8周龄的Balb/c小鼠,无菌取其脾细胞与SP2/0细胞进行细胞融合,筛选阳性杂交瘤细胞株,经小鼠腹腔注射,待小鼠腹腔膨胀后,收集腹水,纯化后进行单克隆抗体浓度、纯度、类及亚类、抗体效价、相对亲和常数、Western blot和间接免疫荧光测定。结果表明,筛选到2株阳性杂交瘤细胞株,分别命名为4G3D4和9D7A7。4G3D4和9D7A7这2株单抗纯化后的浓度分别为2.6 mg/mL、1.6 mg/mL;亲和常数分别为2.30E+10、1.88E+09;抗体亚类均为IgG1,轻链为kappa链;且均能与IBRV发生特异性反应,与接种IBRV的MDBK细胞发生反应,产生特异性荧光;间接ELISA测定腹水效价分别为1∶204800、1∶12800。利用CHO细胞表达的IBRV-gD蛋白成功制备了2株单克隆抗体,为下一步建立特异性的IBRV检测方法奠定了基础。 相似文献
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为筛选犬程序性死亡受体1(cPD-1)单克隆抗体,以原核表达并纯化复性的cPD-1胞外区蛋白为靶抗原免疫BALB/c小鼠,应用单克隆抗体杂交瘤细胞技术和间接ELISA方法,经3轮轮筛选和克隆化,获得1株能稳定分泌抗cPD-1单克隆抗体的杂交瘤细胞株1F9。间接ELISA检测显示1F9杂交瘤细胞株连续传代培养能稳定分泌单克隆抗体,效价达到1∶2048,亚型鉴定重链为IgG1,轻链为κ;以HEK293细胞表达cPD-1胞外区蛋白为检测抗原,Western-blot和间接免疫荧光试验进行鉴定,结果显示1F9单克隆抗体能特异性结合cPD-1胞外区蛋白。本研究通过小鼠杂交瘤技术成功筛选到1株鼠源cPD-1单克隆抗体。 相似文献
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研究旨在制备DRV p18蛋白单克隆抗体。试验通过原核表达并纯化DRV p18重组蛋白,经BCA蛋白浓度测定后免疫BALB/c小鼠;通过细胞融合技术制备杂交瘤细胞,获得的p18单克隆抗体通过ELISA、IFA和Western blot试验进行鉴定,并将杂交瘤细胞腹腔注射小鼠获得单抗腹水,通过Western blot试验验证其特异性。结果显示：纯化的重组p18蛋白浓度为1.37 mg/mL,经过三轮亚克隆获得4株分泌单克隆抗体的杂交瘤细胞株1E3、2C4、4A2和4D4,亚型鉴定1E3和4D4重链为IgG1型、2C4重链为IgM型、4A2为IgG2b型,轻链均为κ型;4株单克隆抗体均能使感染DRV的BHK-21细胞发出特异性荧光,并在18 ku处存在特异性条带;4D4腹水ELISA效价为1∶409 600,Western blot效价达1∶102 400,IFA效价为1∶51 200;4D4与DRV反应,而不与其他禽源常见病毒反应。研究成功制备了抗DRV p18蛋白的单克隆抗体,为进一步研探究p18蛋白的功能奠定基础。 相似文献
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《黑龙江畜牧兽医》2010,(5)
为了研究PCV2 Cap蛋白的检测方法,试验应用哈尔滨兽医研究所猪传染病研究室猪病分子诊断组已构建的基因工程重组菌NLS-Cap M15,经IPTG诱导表达获得原核表达Ⅱ型猪圆环病毒Cap蛋白,经亲和层析纯化后免疫6周龄Balb/c小鼠,取其脾细胞与SP2/0骨髓瘤细胞融合,经间接ELISA筛选获得了3株分泌Cap蛋白单克隆抗体的杂交瘤细胞,分别命名为2C3、2F3、1E10。结果表明:2C3、2F3均属于IgG1型,1E10属于IgG2a亚型,轻链都是κ链;经Western-blot检测,获得的3株单抗均可以特异性的识别Cap蛋白;ELISA检测其腹水效价均为1.0×105;间接免疫荧光检测单抗2C3、2F3、1E10反应均为阳性,表明这3株单抗能够识别PCV2病毒。 相似文献
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《畜牧与兽医》2020,(10)
为制备针对犬细小病毒(CPV)的单克隆抗体,以纯化的CPV免疫BALB/c小鼠,3次免疫后,取其脾细胞与SP2/0细胞进行细胞融合。利用超速离心纯化的病毒作为包被抗原,采用间接ELISA方法筛选阳性杂交瘤细胞,获得3株能稳定分泌单克隆抗体的杂交瘤细胞株,分别命名为1D9、3G9和4F6。单克隆抗体细胞培养上清效价为1∶64、1∶64、1∶128,腹水效价为1∶10~4、1∶10~4、1∶10~5。3株杂交瘤细胞的染色体数分别为92、94、98。亚类鉴定结果显示1D9和3G9重链为IgG1,4F6重链为IgG2b,轻链均为kappa链。病毒中和试验表明,单克隆抗体4F6对CPV具有明显的病毒中和活性。交叉试验表明,3株单克隆抗体均可与CPV特异性结合,与其他犬类常见病毒无交叉反应。本研究制备的单克隆抗体为CPV的检测及其感染动物的治疗提供了物质基础。 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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以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。 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