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1.
动物细胞高密度培养用多孔微球   总被引:5,自引:0,他引:5  
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2.
微载体高密度培养Vero细胞的研究   总被引:10,自引:0,他引:10       下载免费PDF全文
微载体是动物细胞高密度培养的有效手段。首先在硅化的方瓶中对Cytodex 1、Cy-todex 3、Biosilon、Bellco Glass Microcarrier、CT-1、CT-3、MC-1、CT-28种国产和进口微载体进行了比较和筛选。确定以Biosilon作为Vero细胞高密度培养的首选微载体。用500mlWheaton搅拌瓶探索影响Vero细胞高密度培养的条件,表明50~60mg/ml的微载体浓度、1~2×106/ml的细胞接种密度、适当的通气(95%O_2+5%CO2)对该细胞的高密度培养具有重要意义。在200ml培养体积的Wheaton搅拌瓶中,微载体浓度为50~60mg/ml,细胞接种密度为9.24×105/ml,搅拌速度为65~85r/min,经25d培养,Vero细胞密度可达2.34×107/ml,表明50~60mg/ml的微载体浓度对培养细胞没有毒性。接着在1.5L CelliGen生物反应器中进行培养,细胞接种密度为4.98×105/ml,培养体积为1.2L,日灌流量从0.20L逐渐加大到3.65L,经22d连接灌流培养,最终细胞密度可达2.05×107/ml。  相似文献   

3.
对三种不同培养方法进行细胞生长速度、密度、营养及代谢产物浓度的比较分析,以优化和筛选最佳培养条件与方式。用同体积生物反应罐,基本培养条件相同,采用批培养、再循环培养、灌流培养三种方式进行了Vero细胞微载体(CytodexI)的周期培养。三种培养方法均达到预期效果,最终细胞密度分别为每毫升2.09×10  相似文献   

4.
用国产生物反应器大规模高密度培养Vero细胞   总被引:3,自引:3,他引:3  
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5.
动物细胞高密度培养用多孔微球王佃亮肖成祖(中国人民解放军航空医学研究所100036)多孔微球(porousmicrospheres)又称多孔微载体(porousmicrocariers)或大孔微载体(macroporousmicrocariers),是近几年在国外发展起来的一项新的动物细胞高密度培养生物技术。它克服了固体微载体(solidmicrocar-iers)培养时细胞仅在表面生长、微...  相似文献   

6.
目的:比较Vero细胞在不同的商品化微载体中固定化培养的生长和代谢。方法:以Vero细胞在含1%新生牛血清的DMEM/F12中培养的细胞形态、活细胞密度和细胞活力为指标,考察Vero细胞在2D MicroHex、Biosilon、Cytodex1和Cytopore1微载体固定化培养的细胞生长;以葡萄糖比消耗速率(qglc)、乳酸比生产速率(qlac)、谷氨酰胺比消耗速率(qgln)和谷氨酸比生产速率(qglu)为指标,考察Vero细胞在不同微载体固定化培养的细胞代谢。结果:Vero细胞在2DMicroHex、Biosilon、Cytodex1和Cytopore1微载体固定化培养7d的活细胞密度分别为18.4×105cells/ml、21.9×105cells/ml、23.9×105cells/ml和16.2×105cells/ml,生长在Cytodex1表面的Vero细胞分布均匀、形态清晰;Vero细胞在不同微载体固定化培养的代谢指标基本相同。结论:Vero细胞在Cytodex1微载体固定化培养的效果优于其它商品化微载体,可作为目前用于病毒疫苗生产的Vero细胞固定化培养的首选微载体。  相似文献   

7.
目的:设计适用于Vero细胞微载体培养的化学成分明确无血清培养基。方法:以商品化的DMEM/F12合成培养基为基础培养基,应用Plackett—Burman实验设计和响应面分析法设计支持Vero细胞微载体培养的化学成分明确无血清培养基。结果:以细胞密度为评价指标,在单因素实验的基础上采用Plackett-Burman实验设计考察10种培养基添加成分对Vero细胞生长的影响,确定了3种对Vero细胞生长起明显促进作用的培养基添加成分,为胰岛素、血清素和腐胺。继而利用响应面法分析了这3种添加成分的最佳水平范围,设计了一种支持Vero细胞贴附培养的无血清培养基(VERO—SFM—A)。在Bellco搅拌式培养瓶中采用VERO-SFM.A和Cytodex1微载体培养Vero细胞,细胞密度由接种时的4×10^5cells/ml增加到培养6d后的22.3×10^cells/ml,细胞活力保持在96%以上。结论:VERO—SFM—A能够有效地支持Vero细胞在微载体表面固定化生长并达到较高的细胞密度,具有实际应用于Vero细胞微载体规模化培养的应用潜力。  相似文献   

8.
微载体规模化培养细胞的研究   总被引:3,自引:0,他引:3  
通过实验探索使用微载体进行动物细胞规模化培养,以期达到建立规模化生产病毒疫苗的目的。实验研究了Vero细胞的生长曲线,以及对细胞生长过程中影响细胞生长的葡萄糖、氨含量两个主要因素的变化规律以及微载体浓度与细胞密度的关系。通过实验发现微载体规模化培养细胞易于操作,比传统转瓶培养的细胞密度高,封闭式的培养方式不但减少了污染几率,而且可以充分保证疫苗的质量。最终找出适宜疫苗培养的微载体使用浓度为2.5g/L,适宜的细胞接种浓度为:1~5×105cell/m l。  相似文献   

9.
Vero细胞是世界卫生组织和我国生物制品规程认可的疫苗生产细胞系。随着对疫苗质量和安全性要求的不断提高,用无血清培养基取代含血清培养基培养Vero细胞已成为病毒疫苗生产的一个重要发展趋势。Vero细胞无血清培养的技术关键是研发或选择能支持细胞以贴附培养方式生长的无血清培养基。微载体培养是贴附依赖性细胞系规模化培养和病毒疫苗生产的有效技术途径。我们对Vero细胞无血清培养基的研发、Vero细胞无血清培养及病毒疫苗生产工艺做了讨论,对该领域存在的问题和发展策略进行了展望。  相似文献   

10.
自本世纪70年代狂犬病二倍体疫苗研制成功并批量应用以来,各种细胞疫苗相继研制成功并投入生产和应用,已在许多国家代替了传统的脑组织疫苗。我们对Vero细胞微载体培养的狂犬病疫苗作了初步研究,为大规模生产提供依据。1材料与试剂1.IVere细胞由中国药品生物制品检定所提供Vero细胞125代种子细胞。1.2病毒株狂犬病毒Vero细胞适应株CTN*。由检定所提供,毒力为7.lfogLfy。/Inl。我们对病毒株进行了适应性传代,毒力达到8.24logLfy。/Inl,高于国内发表材料4aG.Fluav.Inp株[’,到的满度。1.3生物反应器CeligenplusN哪沿…  相似文献   

11.
目的:优化并获得重组尿酸氧化酶(rUOX)基因工程大肠杆菌BL21(DE3)/pET-32a-uox高密度发酵的工艺参数。方法:在三角摇瓶中进行培养条件的优化实验,分别考察了pH值、接种量、无机盐、碳源、诱导强度等对工程菌生长和重组蛋白表达的影响,得到了优化的发酵条件;在此基础上放大至NBS BIOFLO 110 14 L发酵罐,通过对诱导时机的优化,利用分批补料发酵的方式,使rUOX在高密度培养的条件下得到高表达。结果:在优化的发酵条件下,菌体密度(D600nm)最终达到50以上,相当于20 g/L干重;可溶性rUOX占菌体总蛋白量的45%,其含量达到3.45 g/L。结论:为规模化制备重组黄曲霉尿酸氧化酶奠定了基础。  相似文献   

12.
以表达普鲁兰酶的重组大肠杆菌作为出发菌株,在摇瓶培养的基础上,建立了大肠杆菌工程菌产普鲁兰酶的高密度发酵工艺。通过测定细胞密度、细胞干重、分离菌体可溶性成分与不溶性成分及SDS-PAGE电泳,分析重组大肠杆菌的生长和普鲁兰酶的表达情况。摇瓶试验使用合成培养基和LB培养基,重组大肠杆菌在合成培养基生长较慢,诱导5 h的普鲁兰酶表达量高于LB培养基,包涵体比例低于LB培养基。重组大肠杆菌的高密度发酵使用合成培养基,补料阶段采用指数流加的工艺,在设定细胞的比生长速率为0.12的前提下,限制补料中碳源的供应,以阻止乙酸的产生。当细胞密度OD600达到70.0开始诱导,最终细胞密度为每升53.3 g细胞干重,细胞内可溶性普鲁兰酶为每升1.35 g。  相似文献   

13.
  总被引:2,自引:0,他引:2  
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14.
高产菊粉酶酵母筛选、发酵和酶学性质研究   总被引:18,自引:0,他引:18       下载免费PDF全文
筛选到1株菊粉酶高产克鲁维酵母菌株,采用酵母高密度细胞发酵方法,最高菊粉酶产量达到288.78u/mL,比80~90年代国际上报道的克鲁维酵母菊粉酶最高产量高6.8倍。该酶的菊粉酶/转化酶活性比为1/24.72;菊糖m=13.3mmol/L,蔗糖Km=62.6mmol/L;最适反应pH值为4.4,但在pH3.8~5.6的范围内均保持了较高的活性,相当于最适pH值下活性的90%;最适反应温度为55℃,在50~575℃范围内能够保持较高活性,50℃下酶的半衰期约为16h;外加Mg2+提高酶活性11.28%。  相似文献   

15.
Vero细胞是世界卫生组织和《中国药典》认可的用于人用疫苗和动物疫苗生产的细胞系,Vero细胞无血清培养生产疫苗已成为当前的主要趋势。无血清培养的关键是设计符合Vero细胞贴壁特性和提高细胞密度的无血清培养基,这也是规模化培养的关键因素之一。Vero细胞无血清培养基的开发与使用一方面减少了对动物血清的依赖,提高了病毒性疫苗的质量安全;另一方面促进了无血清培养技术的发展与应用。现就Vero细胞无血清培养基的研究进展予以综述。  相似文献   

16.
Choi SK  Chang HN  Lee GM  Kim IH  Oh DJ 《Cytotechnology》1995,17(3):173-183
A depth filter perfusion system (DFPS) with polypropylene fibers had been demonstrated to support high density cultures of anchorage-independent hybridoma cells. The DFPS provides advantages of high surface-to-volume ratio of 450–600 cm2/cm3, low cost set-up, easy operation and scale-up. To test the feasibility of using DFPS for high density cultures of anchorage-dependent cells, Vero cells were cultivated in the DFPS. Gelatin coating on polypropylene fibers in the DFPS was necessary to promote cell attachment and growth. Dissolved oxygen (DO) concentrations could be controlled by sparging air into the reservoir vessel through a filter sparger. When DO concentration was controlled above 40% of air saturation in the DFPS with 40 m pore size, the maximum cell concentration as estimated on specific lactate production rate, was 3.81×107 cells/ml of the total reactor volume. This viable cell concentration is approximately 18 times higher than that obtained in a T-flask batch culture. Taken together, the results obtained here showed the potential of DFPS for high-density cultures of anchorage-dependent cells.  相似文献   

17.
    
Angiotensinogen (AGT), a glycosylated plasma noninhibitory serpin, serves as a precursor for angiotensin peptides which regulate blood pressure and electrolyte balance. AGT is specifically cleaved by renin to produce angiotensin-I, the first product of the angiotensin-processing cascade. Ovine angiotensinogen (oAGT) is considered an effective substrate for human renin and consequently finds application in clinical renin assays. In this study, oAGT was cloned into the genome of Pichia pastoris and expressed under the control of alcohol oxidase (AOX1) promoter for high-level production. Compared to the shake flask study, the high cell density cultivation in bioreactor resulted in multifold increase in oAGT titer (420 ± 9.26 mg/L), which is its highest reported titer to date. We purified recombinant oAGT to homogeneity using two chromatography steps. The characterization studies revealed oAGT underwent a two-state transition during thermal denaturation process as assessed by differential scanning fluorimetry, and the melting temperature (Tm) of the purified oAGT from P. pastoris was 48.3°C. Renin reactivity with recombinant oAGT from P. pastoris (0.51 nM angiotensin-I/min) was slightly lower than the renin reactivity for recombinant oAGT from Escherichia coli (0.67 nM angiotensin-I/min), possibly because of its mannosylated N-glycan content. Enhanced production of functionally active recombinant oAGT using P. pastoris expression system reported in this study envisage the effective utilization of oAGT in clinical studies related to renin in near future.  相似文献   

18.
为了筛选出适合Vero细胞生长的最佳条件,本研究分别对Vero细胞的培养液、传代比例和接种浓度进行了优化.首先将Vero细胞在不同组合培养液中进行连续3代传代培养,筛选出适宜Vero细胞连续稳定传代的最佳培养液组成.然后分别在不同的传代比例和接种浓度下进行连续3代培养,筛选出适宜Vero细胞连续稳定传代的最佳传代比例和接种浓度.最终结果显示,Vero细胞在1.296%MEM溶液与特级胎牛血清的组合优于其他组合,可满足Vero细胞连续稳定传代.并且在该培养基的培养下,1∶6的传代比例为最适宜Vero细胞的传代比例,3×104/cm2的接种密度为最适宜Vero细胞的接种密度.本研究最终完成了Vero细胞最佳培养体系条件筛选,并证实该条件满足Vero细胞连续稳定传代.  相似文献   

19.
    
Extracellular production of recombinant proteins in Escherichia coli has several advantages over cytoplasmic or periplasmic production. However, nonpathogenic laboratory strains of E. coli generally excrete only trace amounts of proteins into the culture medium under normal growth conditions. Here we report a systematic proteome-based approach for developing a system for high-level extracellular production of recombinant proteins in E. coli. First, we analyzed the extracellular proteome of an E. coli B strain, BL21(DE3), to identify naturally excreted proteins, assuming that these proteins may serve as potential fusion partners for the production of recombinant proteins in the medium. Next, overexpression and excretion studies were performed for the 20 selected fusion partners with molecular weights below 40 kDa. Twelve of them were found to allow fused proteins to excrete into the medium at considerable levels. The most efficient excreting fusion partner, OsmY, was used as a carrier protein to excrete heterologous proteins into the medium. E. coli alkaline phosphatase, Bacillus subtilis alpha-amylase, and human leptin used as model proteins could all be excreted into the medium at concentrations ranging from 5 to 64 mg/L during the flask cultivation. When only the signal peptide or the mature part of OsmY was used as a fusion partner, no such excretion was observed; this confirmed that these proteins were truly excreted rather than released by outer membrane leakage. The recombinant protein of interest could be recovered by cleaving off the fusion partner by enterokinase as demonstrated for alkaline phosphatase as an example. High cell density cultivation allowed production of these proteins to the levels of 250-700 mg/L in the culture medium, suggesting the good potential of this approach for the excretory production of recombinant proteins.  相似文献   

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