首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献，搜索用时 203 毫秒
1.
本试验旨在建立次黄嘌呤鸟嘌呤磷酸核糖转移酶(HGPRT)缺陷型的HepG2细胞系,为细胞杂交与单克隆抗体的研究提供亲本细胞。通过N-甲基-N-硝基-N-亚硝基胍(MNNG)诱导HepG2细胞突变,逐步提高培养液中6-巯基鸟嘌呤(6-TG)的浓度,筛选出对6-TG有抗性的细胞株,检测它在HAT中生长的情况。得到可在含20 μg/mL 6-TG的高糖DMEM完全培养基中稳定生长的细胞株,此细胞株在HAT培养基中第3天出现明显的死亡,第12天全部死亡,诱变后细胞的染色体分布于32-88,染色体众数为48。突变筛选出的细胞具有对6-TG抗性和对HAT敏感的特性,证实该细胞是HGPRT缺陷型细胞株,为以后进行杂交瘤制备提供了适宜的亲本细胞。  相似文献   

2.
用重氮化法人工合成氯霉素-牛血清蛋白（CAP-BSA）抗原免疫BALB/c小鼠,应用杂交瘤技术将免疫鼠脾细胞与SP2/0细胞融合,建立了分泌抗CAP单克隆抗体（McAb）的杂交瘤细胞株.经检测、鉴定,筛选出5株高亲和力的杂交瘤细胞株,其腹水效价均高于1：10^6,且5株杂交瘤细胞株分泌的单抗与其他几种抗生素无交叉反应,可用于氯霉素的快速检测.  相似文献   

3.
本研究利用血凝抑制试验(HI)、反转录-聚合酶链式反应(RT-PCR)、基因测序等方法,对广东省某活禽交易市场进行流行病学调查时获得的两株非H5、H9亚型禽流感病毒65株和C7株进行了亚型鉴定。结果表明这两株病毒均具有血凝活性,且能被抗H6亚型禽流感病毒标准阳性血清特异性抑制。用针对禽流感病毒的M基因、H6亚型禽流感病毒HA基因、N2亚型禽流感病毒NA基因特异性鉴定引物对65株和C7株进行RT-PCR扩增,分别获得特异性目的片段。测序及BLAST分析表明两株分离株与H6N2亚型禽流感广东分离株的HA基因和NA基因核苷酸序列相似性均高达95%以上。将该两分离株鉴定为H6N2亚型禽流感病毒,并命名为A/Chicken/Guangdong/65/2009、A/Chicken/Guangdong/C7/2009。  相似文献   

4.
鸭肝炎病毒单克隆抗体的研制   总被引：1，自引：0，他引：1  
以反复冻融、氯仿处理、滤膜过滤、PEG反透析浓缩和分子筛层析的方法纯化DHV免疫BALB／c小鼠，同时作为包被抗原建立了筛选抗DHV阳性杂交瘤细胞株的间接ELISA方法，经特异性和重复性试验，效果良好。经一系列融合、筛选，成功获得阳性杂交瘤细胞株4株，并制备出了腹水，分别命名为285、2E8、5E6和6C11。特性鉴定结果表明4株单抗ELISA效价均比较高且特异性好，中和特性稍差，和两株Ⅰ型标准毒以及在山东分离到的几株病毒均有交叉反应。  相似文献   

5.
制备抗促乳素(prolactin,PRL)的单克隆抗体。应用PRL纯品免疫BALB/c小鼠,被免疫小鼠的脾细胞与SP2/0骨髓瘤细胞融合,间接ELISA筛选阳性克隆,将阳性克隆多次有限稀释得到抗PRL阳性单克隆细胞株,杂交瘤细胞上清分离法和诱生腹水法制备单克隆抗体,测其效价。共建立5株持续分泌抗体的杂交瘤细胞,分别命名为AA5B1、AB6C8、BB3C1、CA6E4、CE2H6。杂交瘤细胞株冻存4个月后复苏培养,形态良好,生长旺盛。培养液上清及腹水效价的OD值略有升高,说明杂交瘤细胞株稳定。5株杂交瘤细胞染色体众数均为99～105,并可见到中部和亚中部着丝点的骨髓瘤细胞标志染色体,说明5株杂交瘤细胞确为SP2/0骨髓瘤细胞与被免疫小鼠的脾细胞融合而产生的。  相似文献   

6.
为建立掺糖造假蜂蜜中残留糖化酶的检测方法,用从黑曲霉中提取的糖化酶作为免疫原,免疫BALB/c小鼠,利用杂交瘤技术获得了12株稳定分泌针对糖化酶抗体的杂交瘤细胞株。单克隆抗体亚型鉴定结果显示,10株为IgG1,2株为IgG2b,轻链均为κ轻链。Western blotting分析结果表明,12株抗体均可特异性结合糖化酶。其中6株单抗(McAb-2H4F9、6H9D8、8F2F11、8F2E9、1A8G6、1C4D5)细胞株采用体内诱生法制备的腹水效价均1∶1×104以上。采用抗体叠加试验对这6株抗糖化酶单抗的抗原识别位点进行检测,反应增殖结果表明,6株单抗分别针对4类不同抗原位点,McAb-6H9D8和McAb-8F2F11针对第Ⅰ种抗原决定簇;McAb-1A8G6和McAb-1C4D5针对第Ⅱ种抗原决定簇;McAb-8F2E9针对第Ⅲ种抗原决定簇;McAb-2H4F9针对第Ⅳ种抗原决定簇。制备的抗体针对不同的抗原表位,为双抗夹心ELISA方法的建立提供前提。  相似文献   

7.
用纯化的重组猪轮状病毒VP6蛋白免疫BALB/c小鼠,制备多克隆抗血清,同时运用淋巴细胞杂交瘤技术,通过间接ELISA筛选,获得了1株稳定分泌抗猪轮状病毒VP6的单克隆抗体(McAb)的杂交瘤细胞株,命名C5D10。应用抗猪轮状病毒VP6蛋白单克隆抗体和多克隆抗血清对感染猪轮状病毒的Marc-145细胞培养物进行了间接免疫荧光检测病原的比较研究。结果表明,利用所研制的抗猪轮状病毒VP6蛋白McAb进行间接免疫荧光法对病原检测具有很高的特异性。  相似文献   

8.
为制备角蛋白19片段（CYFRA21-1）的单克隆抗体（mAb）,采用间接 ELISA 方法检测免疫小鼠的抗体效价,融合、筛选、克隆化单克隆抗体,将筛选得到的单克隆细胞株注入小鼠腹腔制备腹水,采用辛酸硫酸铵法、蛋白 A 柱纯化腹水抗体,以 SDS-PAGE 凝胶电泳、紫外分光光度法检测抗体纯度和浓度;利用鼠抗体亚型鉴定试剂盒对单克隆抗体进行亚型鉴定;采用阻断 ELISA 法测定 mAb 的敏感性（IC50）。结果表明,筛选获得4株分泌角蛋白19片段 mAb 的细胞株,将4株细胞株2F9、3H5、7C3、6F11注入小鼠腹腔,分别获得效价为2．56×105、5．12×105、5．12×105、2．56×105的单克隆抗体,经纯化,抗体蛋白浓度为12．43 mg／mL～16．00 mg／mL,为 IgG1型抗体,其 IC50在1．03 ng／mL～1．53 ng／mL 之间。说明获得了4株分泌高效价 CYFRA21-1单克隆抗体的细胞株,为建立 CYFRA21-1的检测试剂盒奠定了基础。  相似文献   

9.
猪肺炎霉形体单克隆抗体的制备与鉴定   总被引：1，自引：0，他引：1  
用KM2培养基(含马血清)培养猪肺炎霉形体(Mhp)ZCF23株，对培养物高速离心，用PBS悬浮，反复冻融裂解后作为免疫原，腹腔注射免疫BALB／c小鼠。利用淋巴细胞杂交瘤技术获得了5株分泌特异性抗体的单克隆抗体细胞株，分别命名为11C6、14C11、1186-1、10C11-2和12E7-1。生物学特性鉴定结果表明，5株腹水单克隆抗体的间接ELISA效价均在1：10000左右；免疫球蛋白亚类均为IgG3；免疫印迹结果显示，5株单克隆抗体所针对的抗原表位在90、40、70和60 ku左右的蛋白分子上，均不与马血清蛋白反应，说明这些单克隆抗体均是针对Mhp蛋白的特异性单克隆抗体。  相似文献   

10.
为制备血清4型禽腺病毒(FAdV-4)广西分离株(FAdV-4-GX2018-005)的特异性单克隆抗体，将FAdV-4-GX2018-005作为免疫原免疫BALB/c小鼠后，取小鼠脾细胞与SP2/0细胞融合，利用间接ELISA法筛选阳性杂交瘤细胞株。利用阳性杂交瘤细胞株制备腹水并纯化得到单克隆抗体，利用ELISA和IFA鉴定单克隆抗体的特异性。结果表明，成功获得3株单克隆细胞株3A3、13A11和4D5。3株杂交瘤细胞株分泌的抗体，能与FAdV-4产生特异性反应，与其他血清型禽腺病毒(FAdV-1、FAdV-2、FAdV-3、FAdV-5、FAdV-6、FAdV-7、FAdV-8a、FAdV-8b、FAdV-9、FAdV-10和FAdV-11)不发生反应。本研究成功制备FAdV-4广西分离株单克隆抗体，为FAdV-4检测方法的建立奠定了良好基础。  相似文献   

11.
于艳 《中国畜牧兽医》2010,37(12):45-47
试验旨在观察苏木乙酸乙酯提取物对溃疡性结肠炎(ulcerative colitis,UC)大鼠T细胞亚群和IL-6的影响。将40只Wistar大鼠随机分成正常组、模型组、苏木组、柳氮磺胺吡啶(SASP)组,除正常对照组外,其余各组大鼠用兔黏膜免疫法造模。造模后各组分别以生理盐水、苏木乙酸乙酯提取物、SASP灌胃给药21 d。运用流式细胞术及ELISA法检测外周血T细胞亚群和IL-6的表达。结果显示,模型组CD4+T细胞升高、CD4+/CD8+升高、IL-6的含量明显增高,与正常组相比,差异显著(P0.05);苏木组、SASP组CD4+T细胞降低、CD4+/CD8+降低、IL-6的含量明显降低,与模型组相比,差异显著(P0.05);苏木组与SASP组相比,差异不显著(P0.05)。试验结果证明,苏木乙酸乙酯提取物通过调整T细胞亚群和降低IL-6含量,发挥对UC大鼠的治疗作用。  相似文献   

12.
原核表达单增李斯特菌(Lm)ActA蛋白并进行亲合层析纯化,检测ActA的免疫原性,以表达蛋白为检测抗原制备Lm单克隆抗体,并对单抗的亚型、效价、亲合力及特异性进行测定。结果表明,成功表达了ActA蛋白;表达蛋白诱导了特异性的细胞免疫和体液免疫,具有良好的免疫原性;共获得4株抗Lm ActA单克隆抗体。其中3G6、4E10和2B9为IgG1亚类;腹水抗体效价,3G6和4E10为1∶64000,2B9为1∶32000;3G6、4E10和2B9的亲和常数分别为6.62×107M-1、5.67×107M-1和7.15×106M-1;3G6、2B4和4E10为Lm特异性单抗,2B9为致病性李斯特菌特异性单抗。所制备的单抗可用于Lm检测方法的建立。  相似文献   

13.
The effect of X-irradiation on the progression of the cell cycle in cell lines from LEC and WKAH rats was investigated by a flow cytometer. When the cells were exposed to 5 Gy of X-rays at S phase, the proportion of S-phase cells in both cell populations decreased with incubation time and that of G2/M-phase cells was approximately 80% at 6 hr post-irradiation. At 12 hr post-irradiation, approximately 45% of the WKAH rat cells appeared in the G1 phase. However, 80-90% of LEC rat cells remained in the G2/M phase and less than 5% in the G1 phase during 6-12 hr post-irradiation. Thus, the LEC rat cells irradiated at S phase remained in the G2/M phase for at least 6 hr longer than did the WKAH rat cells.  相似文献   

14.
研究黄芪多糖对体外培养的大鼠肠黏膜微血管内皮细胞（rat intestinal mucosa microvascular endothelial cells,RIMMVECs）增殖的影响。应用不同浓度的黄芪多糖作用于体外培养的RIMMVECs。通过MTT法检测黄芪多糖对RIMMVECs增殖的影响。不同浓度的黄芪多糖对细胞增殖的影响不同:黄芪多糖浓度在25～800 mg/L时可明显促进细胞的增殖（P<0.05或0.01）;浓度为1.6×103 mg/L时对细胞的增殖无影响;浓度在3.2×103～25.6×103 mg/L时对细胞生长具有抑制作用（P<0.05或0.01）。黄芪多糖有促进体外培养RIMMVECs的增殖作用,此作用对保护内皮损伤、加速内皮修复有重要作用。  相似文献   

15.
Hydroxyurea (HU), an anticancer drug, inhibits ribonucleoside diphosphate reductase and reduces pool sizes of deoxyribonucleoside triphosphate (dNTP). The reduction of dNTP results in inhibition of DNA replication. The cytotoxic effect of HU was investigated using fibroblast cell lines from LEC rats. LEC rat cells showed significantly higher sensitivity to HU than did cell lines from control WKAH rats. No significant differences were observed between the percentages of apoptotic cells in either LEC or WKAH rat cells that had been treated with HU and those that had not been treated with HU. LEC rat cells also showed significantly higher sensitivity to aphidicolin, which blocks DNA synthesis by inhibiting DNA polymerase alpha, than did WKAH rat cells. In both LEC and WKAH rat cells, intensified bands of p53 protein were observed immediately after treatment with HU. Although the high level of p53 protein persisted in WKAH rat cells until 6 hr post-incubation time after treatment with HU, the level of p53 protein had decreased at 6 hr post-incubation time in LEC rat cells. When the cells were X-irradiated in the absence or presence of HU, the ratio of the surviving fraction without HU to that with HU only slightly increased after X-irradiation in WKAH rat cells. In contrast, the ratio in LEC rat cells significantly increased after X-irradiation in a dose-dependent manner.  相似文献   

16.
Epithelial–mesenchymal transition (EMT) is a fundamental phenomenon in organisms that occurs during gastrulation, wound healing, and cancer metastasis. Various cytokines induce EMT processes through complex mechanisms. Inflammatory cytokines, such as tumor necrosis factor alpha (TNF-α) and interleukin 6 (IL-6), induce EMT in human cell lines. However, whether inflammatory cytokines can affect EMT processes in canine cell lines remains unclear. In this study, we investigated the role of transforming growth factor beta (TGF-β), TNF-α, and IL-6 in Madin-Darby canine kidney (MDCK) cells. We found that the localization of E-cadherin, a cell adhesion molecule, was shifted and that its expression was decreased. We also observed morphological changes in MDCK cells under persistent stimulation of inflammatory cytokines. Morphological changes in cells may occur during late stages of EMT processes; inflammatory cytokines may be important in these changes.  相似文献   

17.
赤羽病毒单克隆抗体的研制及鉴定   总被引：2，自引：2，他引：0  
用纯化的赤羽病毒（akabane virus,AKAV）免疫Balb/c小鼠,取小鼠脾细胞和骨髓瘤细胞SP2/0融合,经间接ELISA筛选和3次有限稀释法克隆,得到2株能稳定分泌抗赤羽病毒单克隆抗体（McAb）的杂交瘤细胞株,分别命名为AKAV McAb 3A株和2C株。ELISA试验和中和试验结果表明,本研究制备的2株McAb均具有良好的特异性,为AKAV阳性,杂交瘤细胞培养上清液抗体的效价分别为1∶640和1∶320,腹水的效价分别为1∶256000和1∶128000,亲和常数（Ka）分别为1.16×10-9和6.31×10-8 mol/L,3A株的相对亲和力大于2 C株,具有病毒中和活性,中和效价分别为1∶64和1∶32,其IgG亚类为IgG1,轻链的亚型均为kappa型,2株细胞冻存3次复苏后仍能稳定分泌抗体,表明AKAV McAb制备成功,为赤羽病快速诊断方法的研究奠定了基础。  相似文献   

18.
The current success rate of cloned mice from adult somatic cell nuclei is very low, whereas it is relatively high for cloned mice from ES cell nuclei. In this experiment, we examined whether the success rate of cloning from somatic cells could be improved via nuclear transfer embryonic stem cells (ntES cells) established from somatic cell nuclei. We obtained 11 cloned mice and 68 ntES cell lines from the somatic cell nuclei of 7 mice, and cloned 41 mice were cloned from the ntES cell nuclei. Unexpectedly, the overall success rate of cloning from ntES cell nuclei in this series was no better than when using somatic cell nuclei. Interestingly, full-term cloned mice were produced only via ntES cells from two individuals, but not by direct nuclear transfer from the somatic cells, and vice versa. Ultimately, we were able to obtain clone mice from 6 out of 7 individuals using either somatic cells or ntES cells. Thus, although ntES cells as donor nuclei do not absolutely assure a better success rate for mouse cloning than somatic cells, to preserve and clone valuable individuals, we recommend that ntES cell lines be established. These can then be used as an unlimited source of donor nuclei for nuclear transfer, and thus complement conventional somatic cell nuclear transfer cloning approaches.  相似文献   

19.
This study was designed to investigate whether supplementation of 2i medium with leukemia inhibitory factor (LIF) and/or forskolin would support establishment of germline-competent rat embryonic stem (ES) cell lines. Due to the higher likelihood of outgrowth rates, supplementation of forskolin with or without LIF contributed to the higher establishment efficiency of ES cell lines in the WDB strain. Germline transmission competency of the chimeric rats was not influenced by the profile of ES cell lines until their establishment. When the LIF/forskolin-supplemented 2i medium was used, the rat strain used as the blastocyst donor, such as the WI strain, was a possible factor negatively influencing the establishment efficiency of ES cell lines. Once ES cell lines were established, all lines were found to be germline-competent by a progeny test in chimeric rats. In conclusion, both LIF and forskolin are not essential but can play a beneficial role in the establishment of “genuine” rat ES cell lines.  相似文献   

20.
When lung fibroblast cell lines from LEC and WKAH rats were irradiated with ultraviolet B (UVB) and assayed for colony formation, LEC rat cells showed a higher sensitivity than did WKAH rat cells. The LEC rat cells were approximately 1.5-fold more sensitive to UVB radiation than were the WKAH rat cells in terms of D37 values, which are the doses of UVB required to reduce cell survival to 37%. When the rat cells were irradiated with UVB in the presence of 0.5 M dimethyl sulfoxide (DMSO), which efficiently scavenges free radicals such as hydroxyl radicals, no significant difference was observed between the survival curves of either LEC or WKAH rat cells irradiated with UVB in the presence of 0.5 M DMSO and those irradiated with UVB in the absence of DMSO. Therefore, formation of free radicals may not be involved in cell death induced by UVB radiation. Flow cytometry showed that the percentage of apoptotic cells in the LEC rat cell population increased with post-incubation time after UVB radiation. The proportion of apoptotic cells in the UVB-irradiated LEC rat cell population increased as the dose of UVB was increased. In contrast, no significant proportion of apoptotic cells was observed in the UVB-irradiated WKAH rat cell population. These results showed a higher sensitivity in induction of apoptosis by UVB radiation in LEC rat cells than in WKAH rat cells.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号