Name: transient expression of proteins by hydrodynamic gene delivery in mice
Uploaded: 2014-05-05T16:30:00
Description: Watch this Scientific Journal Video about Transient Expression of Proteins by Hydrodynamic Gene Delivery in Mice at JoVE.com

我们感谢刘霞（Regeneron公司制药）的最初教我们的HGD技术和罗素汤姆逊博士（医学阿尔伯特·爱因斯坦学院），他在技术的各个方面不断的指导。这项工作是由亨特学院，纽约市立大学启动基金和国家科学基金会颁发的面包IOS-1249166。我们感谢NYULMC病理组织学核心NYUCI中心支援津贴，NIH / NCI 5 P30CA16087-31为组织学上的小鼠肝脏。

这里描述的所有实验均批准了亨特学院的纽约市立大学机构动物护理和使用委员会。 1，制备无内毒素的质粒DNA <ol><li>挑含有在哺乳动物表达载体目的基因从新鲜的划线平板选择性细菌的单菌落。 </li><li>按照市售的无内毒素质粒纯化试剂盒用于种植和收获细菌的手册中找到的建议。 </li><li>通过以下的市售无内毒素的质粒纯化试剂盒的方案纯化从细菌细胞的无内毒素的质粒DN...

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A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Gene+therapy+progress+and+prospects:+hydrodynamic+gene+delivery.">Gene therapy progress and prospects: hydrodynamic gene delivery.</a> Gene Ther. 14, 99-107 (2007).</li><li>Kobayashi, N., Nishikawa, M., Takakura, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+hydrodynamics-based+procedure+for+controlling+the+pharmacokinetics+of+gene+medicines+at+whole+body,+organ+and+cellular+levels.">The hydrodynamics-based procedure for controlling the pharmacokinetics of gene medicines at whole body, organ and cellular levels.</a> Adv Drug Deliv Rev. 57, 713-731 (2005).</li><li>Al-Dosari, M. S., Knapp, J. E., Liu, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Hydrodynamic+delivery.">Hydrodynamic delivery.</a> Adv Genet. 54, 65-82 (2005).</li><li>Bell, J. B., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Preferential+delivery+of+the+Sleeping+Beauty+transposon+system+to+livers+of+mice+by+hydrodynamic+injection.">Preferential delivery of the Sleeping Beauty transposon system to livers of mice by hydrodynamic injection.</a> Nat Protoc. 2, 3153-3165 (2007).</li><li>Osorio, F. G., de la Rosa, J., Freije, J. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Luminescence-based+in+vivo+monitoring+of+NF-kappaB+activity+through+a+gene+delivery+approach.">Luminescence-based in vivo monitoring of NF-kappaB activity through a gene delivery approach.</a> Cell Commun Signal. 11, (2013).</li><li>Knapp, J. E., Liu, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Hydrodynamic+delivery+of+DNA.">Hydrodynamic delivery of DNA.</a> Methods Mol Biol. 245, 245-250 (2004).</li><li>Yang, J., Chen, S., Huang, L., Michalopoulos, G. K., Liu, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Sustained+expression+of+naked+plasmid+DNA+encoding+hepatocyte+growth+factor+in+mice+promotes+liver+and+overall+body+growth.">Sustained expression of naked plasmid DNA encoding hepatocyte growth factor in mice promotes liver and overall body growth.</a> Hepatology. 33, 848-859 (2001).</li><li>Maruyama, H., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=High-level+expression+of+naked+DNA+delivered+to+rat+liver+via+tail+vein+injection.">High-level expression of naked DNA delivered to rat liver via tail vein injection.</a> J Gene Med. 4, 333-341 (2002).</li><li>Hen, G., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Expression+of+foreign+genes+in+chicks+by+hydrodynamics-based+naked+plasmid+transfer+in+vivo.">Expression of foreign genes in chicks by hydrodynamics-based naked plasmid transfer in vivo.</a> Domestic animal endocrinology. 30, 135-143 (2006).</li><li>Eastman, S. 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B., Liu, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Structural+impact+of+hydrodynamic+injection+on+mouse+liver.">Structural impact of hydrodynamic injection on mouse liver.</a> Gene Ther. 14, 129-137 (2007).</li></ol>

当正确执行，HGD是一个非常安全和有效的转基因运载工具。的关键步骤，以成功HGD是：1）提供的DNA适量在一个大体积的盐水车辆2）插入到小鼠尾静脉3）在小于8秒。 虽然注射过程本身无可否认需要一些手巧，这半年的第二个过程的成功往往在于精心准备实验。必要的，以达到最大的基因表达的质粒DNA的量会有很大的改变取决于所用的质粒，也可以因此表达的基因，DNA被注入?...

自从其首次描述Liu 等人 ，张等人 ，流体力学基因传递（对冲）已经成为一个非常宝贵的工具，在啮齿动物模型系统1，2基因功能研究。该技术涉及的溶液的大量（8-12％体重）的快速注射（5-7秒）到小鼠尾静脉中由靶器官1，2的细胞，以促进质粒DNA的摄取。这些条件导致的肾，脾，肺和心脏，肝脏和较少的基因表达健壮的基因表达。 注射10微克质粒pCMV-LacZ的质粒可以转染高达40％的肝细胞，使得HGD最高效的，非病毒， 体内基因递送方法至今1。不像病毒携带者，质粒DNA是很容易准备，不会引起在啮齿动物宿主3的免疫反应和结尾重组不会对健康构成威胁ogenous病毒。另外，由于通过HGD交付的DNA分子不需要的包装，这种方法适合于细菌人工染色体（BAC）一样大的150 kb的4输送。其它类型的已交付由一个流体动力法分子包括RNA 5-10，吗啉11，蛋白质12，13和其它小分子12,14。 HGD超过其它递送方法的优点和缺点的优良评论已被讨论在文献15-20和许多作者所提供的程序21-23的详细描述。 由HGD引入转基因到小鼠中是安全和有效的1-3，24，并 ​​且该方法已在大鼠可比成功25被使用。有了一定的修改，概念验证的实验已经进行了26只鸡，饶位27和28的猪，虽然在较大的动物的体内应用这一技术仍然是一个挑战。当使用这种方法，另一种常见的限制是，许多现有的哺乳动物表达载体中缺少的组件来实现基因表达的持续性，高水平。使用目标器官的pCMV-吕克质粒，基因表达是明显的，因为早在HGD后十几分钟，然而，最初的高表达水平在注射之后的第一周急剧下降。长期的转基因表达可能依赖于在质粒设计3，24然而，维护高水平的基因表达，往往需要反复注射用的启动子和内含子。出于这个原因，HGD可能会对研究慢性疾病是长期暴露于有害的蛋白质或蛋白质产物的结果不太适合。有了这些限制，HGD是一个非常强大的工具，学习宝基因和它的影响作用潜力在体内 ，以及治疗效果和蛋白质的调控和建立疾病的动物模型突变体（综述见15）。例如，HGD，可以使用由单独引入各种基因构建到小鼠体内已各基因敲除分配功能结构域和蛋白质的氨基酸。此外，该技术可以在任何小鼠品系使用。 本协议描述HGD小鼠，专注于必要的技术方面实现成功转染：正确的针头插入静脉，注射量交付和速度。这种方法的应用是体现在非洲锥虫病，人类的一种致命的疾病和牲畜29，30的小鼠模型。虽然一些物种锥虫引起疾病的家畜，最不能引起疾病，由于先天免疫复合物在B人类载量称为锥虫溶解因子（TLFS）29，31，32。这些孔隙形成，高密度脂蛋白（HDL）包含两个独特的，灵长类特异性蛋白质：HPR，配体，这有利于TLFS的摄取锥虫和APOL-I，裂解组件31，33-38 锥虫布氏罗得西亚能够感染人类由于血清耐药相关蛋白（SRA），其结合并中和人类APOL-I 34，39的表达。狒狒TLF未通过SRA由于其不同的APOL-I蛋白40中和。据此前报道，使用哺乳动物表达载体（pRG977），狒狒TLF成分的转基因小鼠表达赋予的保护，防止人类感染锥虫40。这里提出的有代表性的数据展示如何流体力学基因递送可用于研究蛋白质的治疗效果。

<table border="0" cellpadding="0" cellspacing="0" width="615">
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Alcohol Prep Wipe</td>
			<td style="width:113px;">Webcol</td>
			<td align="right" style="width:119px;">6818</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">AST kit, Amplite Colorimetric</td>
			<td style="width:113px;">AAT Bioquest</td>
			<td align="right" style="width:119px;">13801</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Conical Tube, 50 ml</td>
			<td style="width:113px;">BD Falcon</td>
			<td align="right" style="width:119px;">352070</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">EndoFree Plasmid Maxi Kit</td>
			<td style="width:113px;">Qiagen</td>
			<td align="right" style="width:119px;">12362</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">KimWipes</td>
			<td style="width:113px;">KIMTECH</td>
			<td align="right" style="width:119px;">34120</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="41">
			<td height="41" style="height:41px;width:216px;">Mouse Tail Illuminator</td>
			<td style="width:113px;">Braintree Scientific</td>
			<td style="width:119px;">MTI RST</td>
			<td style="width:167px;">Or equivalent</td>
		</tr>
		<tr height="41">
			<td height="41" style="height:41px;width:216px;">Needle, 20 Gx 1 (0.9mmx25mm)</td>
			<td style="width:113px;">BD</td>
			<td align="right" style="width:119px;">305175</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="41">
			<td height="41" style="height:41px;width:216px;">Needle, 27 Gx 1/2 (0.9mmx25mm)</td>
			<td style="width:113px;">BD</td>
			<td align="right" style="width:119px;">305109</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="61">
			<td height="61" style="height:61px;width:216px;">pRG977 (mammalian expression vector)</td>
			<td style="width:113px;">Regeneron Pharmaceuticals</td>
			<td style="width:119px;"></td>
			<td style="width:167px;">Material Transfer Agreement required</td>
		</tr>
		<tr height="41">
			<td height="41" style="height:41px;width:216px;">Sodium Chloride, 0.9% INJ USP 10 ml, Hospira&#160;</td>
			<td style="width:113px;">Fisher</td>
			<td style="width:119px;">NC9054335</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="61">
			<td height="61" style="height:61px;width:216px;">Syringe, 3ml, Luer-Lok Tip</td>
			<td style="width:113px;">BD</td>
			<td align="right" style="width:119px;">309657</td>
			<td style="width:167px;">Luer Lock necessary to withstand pressure from HGD</td>
		</tr>
	</tbody>
</table>

transient expression of proteins by hydrodynamic gene delivery in mice

体内转基因的有效表达是在基因功能研究和开发治疗疾病至关重要。在过去几年中，水动力基因传递（对冲）已成为交付的转基因老鼠成一个简单，快速，安全，有效的方法。这种技术依赖于通过快速注射大量生理溶液，以增加灌注器官的细胞膜的渗透性的产生的力，从而将DNA传递到细胞内。一个HGD的主要优点是使用裸质粒DNA（pDNA的）引入转基因到哺乳动物细胞的能力。使用质粒导入外源基因是微创费力，高效，违背病毒携带者，非常安全。 HGD最初用于将基因递送到小鼠体内，它现在被用于提供一个范围广泛的物质，包括寡核苷酸，人工染色体，RNA，蛋白质和小分子进入小鼠，大鼠并且，在有限的程度，其他动物。本协议描述HGD小鼠，专注于那些能够成功执行的关键步骤的方法的三个主要方面：针头插入静脉的正确插入，注入的量和交货速度。实施例是为了显示本方法的应用，以2基因编码分泌的，灵长类特异性蛋白的瞬时表达，载脂蛋白李（APOL-I）和触珠蛋白相关蛋白（HPR）。

针的正确定位到小鼠尾静脉中（ 如图1）可以通过流体力学的基于转染成功递送的转基因的先决条件。通常的技术中最具挑战性的部分，但是，尾静脉内针不移动的保持，从而使注射的总体积可在6-8秒钟时间内被传递。在注射过程中的小错误可能导致大大降低转染效率和蛋白表达的影响。因此，必须监测HGD的每个实验的成功。如果感兴趣的转基因蛋白难以通过蛋白印迹分析，由于缺乏...

Watch this Scientific Journal Video about Transient Expression of Proteins by Hydrodynamic Gene Delivery in Mice at JoVE.com

Transient Expression of Proteins by Hydrodynamic Gene Delivery in Mice

在由流体动力基因递送裸DNA的体内转染引入基因到最小的炎症反应的动物的组织中。产生基因产物的足够量，使得基因功能和调节以及蛋白质结构和功能可以被分析。

蛋白通过流体动力基因传递在小鼠体内瞬时表达

Efficient expression of transgenes in vivo is of critical importance in studying gene function and developing treatments for diseases. Over the past ...

transient-expression-of-proteins-by-hydrodynamic-gene-delivery-in-mice

Research

JoVE Journal

Biology

The Preparation of Primary Hematopoietic Cell Cultures From Murine Bone Marrow for Electroporation

It is becoming increasingly apparent that electroporation is the most effective way to introduce plasmid DNA or siRNA into primary cells. The Gene Pulser MXcell  electroporation system and Gene Pulser  electroporation buffer were specifically developed to transfect nucleic acids into mammalian cells and difficult-to-transfect cells, such as primary and stem cells.This video demonstrates how to establish primary hematopoietic cell cultures from murine bone marrow, and then prepare them for electroporation in the MXcell system. We begin by isolating femur and tibia. Bone marrow from both femur and tibia are then harvested and cultures are established. Cultured bone marrow cells are then transfected and analyzed.

This procedure describes how to establish primary hematopoietic cell cultures from murine bone marrow and is followed by transfection using the Gene Pulser MXCell electroporation system.

主电穿孔的小鼠骨髓造血细胞培养制备

It is becoming increasingly apparent that electroporation is the most effective way to introduce plasmid DNA or siRNA into primary cells. The Gene Pulser ...

科研

生物学

Staining of Proteins in Gels with Coomassie G-250 without Organic Solvent and Acetic Acid

In classical protein staining protocols using Coomassie Brilliant Blue (CBB), solutions with high contents of toxic and flammable organic solvents (Methanol, Ethanol or 2-Propanol) and acetic acid are used for fixation, staining and destaining of proteins in a gel after SDS-PAGE. To speed up the procedure, heating the staining solution in the microwave oven for a short time is frequently used. This usually results in evaporation of toxic or hazardous Methanol, Ethanol or 2-Propanol and a strong smell of acetic acid in the lab which should be avoided due to safety considerations. In a protocol originally published in two patent applications by E.M. Wondrak (US2001046709 (A1), US6319720 (B1)), an alternative composition of the staining solution is described in which no organic solvent or acid is used. The CBB is dissolved in bidistilled water (60-80mg of CBB G-250 per liter) and 35 mM HCl is added as the only other compound in the staining solution. The CBB staning of the gel is done after SDS-PAGE and thorough washing of the gel in bidistilled water. By heating the gel during the washing and staining steps, the process can be finished faster and no toxic or hazardous compunds are evaporating. The staining of proteins occurs already within 1 minute after heating the gel in staining solution and is fully developed after 15-30 min with a slightly blue background that is destained completely by prolonged washing of the stained gel in bidistilled water, without affecting the stained protein bands.

A short protocol for protein staining with Coomassie Brilliant Blue (CBB) G-250 in polyacrylamide gels is described without using organic solvents or acetic acid as in the classical staining procedures with CBB.

无有机溶剂和醋酸，蛋白质与考马斯亮蓝G - 250凝胶染色

In classical protein staining protocols using Coomassie Brilliant Blue (CBB), solutions with high contents of toxic and flammable organic solvents ...

Using the Gene Pulser MXcell Electroporation System to Transfect Primary Cells with High Efficiency

It is becoming increasingly apparent that electroporation is the most effective way to introduce plasmid DNA or siRNA into primary cells. The Gene Pulser MXcell electroporation system and Gene Pulser electroporation buffer (Bio-Rad) were specifically developed to easily transfect nucleic acids into mammalian cells and difficult-to-transfect cells, such as primary and stem cells. We will demonstrate how to perform a simple experiment to quickly identify the best electroporation conditions. We will demonstrate how to run several samples through a range of electroporation conditions so that an experiment can be conducted at the same time as optimization is performed. We will also show how optimal conditions identified using 96-well electroporation plates can be used with standard electroporation cuvettes, facilitating the switch from electroporation plates to electroporation cuvettes while maintaining the same electroporation efficiency. In the video, we will also discuss some of the key factors that can lead to the success or failure of electroporation experiments.

This procedure shows how to use the Gene Pulser MXcell electroporation system to rapidly and easily identify the best electroporation conditions for mouse embryonic fibroblasts (MEFs) or other primary cells. Considerations for troubleshooting are also discussed in the associated video.

使用基因脉冲MXcell电穿孔系统主细胞的转染效率高

Using an Automated Cell Counter to Simplify Gene Expression Studies: siRNA Knockdown of IL-4 Dependent Gene Expression in Namalwa Cells

The use of siRNA mediated gene knockdown is continuing to be an important tool in studies of gene expression.  siRNA studies are being conducted not only to study the effects of downregulating single genes, but also to interrogate signaling pathways and other complex interaction networks.  These pathway analyses require both the use of relevant cellular models and methods that cause less perturbation to the cellular physiology.  Electroporation is increasingly being used as an effective way to introduce siRNA and other nucleic acids into difficult to transfect cell lines and primary cells without altering the signaling pathway under investigation. There are multiple critical steps to a successful siRNA experiment, and there are ways to simplify the work while improving the data quality at several experimental stages.  To help you get started with your siRNA mediated gene knockdown project, we will demonstrate how to perform a pathway study complete from collecting and counting the cells prior to electroporation through post transfection real-time PCR gene expression analysis.  The following study investigates the role of the transcriptional activator STAT6 in IL-4 dependent gene expression of CCL17 in a Burkitt lymphoma cell line (Namalwa).  The techniques demonstrated are useful for a wide range of siRNA-based experiments on both adherent and suspension cells.  We will also show how to streamline cell counting with the TC10 automated cell counter, how to electroporate multiple samples simultaneously using the MXcell electroporation system, and how to simultaneously assess RNA quality and quantity with the Experion automated electrophoresis system.

This procedure describes a quick and easy workflow to introduce siRNA into difficult to transfect cell lines and follow gene expression by real-time PCR. Use of an automated cell counter, multi-well electroporation plate, and automated electrophoresis station provide quick and reliable results without the need for expensive robotic handling.

使用自动细胞计数器简化基因表达研究：在Namalwa细胞的IL - 4依赖的基因表达的siRNA击倒

The use of siRNA mediated gene knockdown is continuing to be an important tool in studies of gene expression.  siRNA studies are being conducted not only ...

Paraffin-Embedded and Frozen Sections of Drosophila Adult Muscles

The molecular characterization of muscular dystrophies and myopathies in humans has revealed the complexity of muscle disease and genetic analysis of muscle specification, formation and function in model systems has provided valuable insight into muscle physiology. Therefore, identifying and characterizing molecular mechanisms that underlie muscle damage is critical. The structure of adult Drosophila multi-fiber muscles resemble vertebrate striated muscles 1 and the genetic tractability of Drosophila has made it a great system to analyze dystrophic muscle morphology and characterize the processes affecting muscular function in ageing adult flies 2. Here we present the histological technique for preparing paraffin-embedded and frozen sections of Drosophila thoracic muscles. These preparations allow for the tissue to be stained with classical histological stains and labeled with protein detecting dyes, and specifically cryosections are ideal for immunohistochemical detection of proteins in intact muscles. This allows for analysis of muscle tissue structure, identification of morphological defects, and detection of the expression pattern for muscle/neuron-specific proteins in Drosophila adult muscles. These techniques can also be slightly modified for sectioning of other body parts.

Paraffin-Embedded and Frozen Sections of Drosophila Adult Muscles

Identification of mechanisms underlying muscle damage is crucial. Here we present the histological technique for preparing paraffin-embedded and frozen sections of Drosophila thoracic muscles. This allows analysis of muscle morphology and localization of protein and other muscle cell components.

石蜡包埋及冷冻的部分果蝇成人肌肉

The molecular characterization of muscular dystrophies and myopathies in humans has revealed the complexity of muscle disease and genetic analysis of ...

In vitro Reconstitution of the Active T. castaneum Telomerase

Efforts to isolate the catalytic subunit of telomerase, TERT, in sufficient quantities for structural studies, have been met with limited success for more than a decade. Here, we present methods for the isolation of the recombinant Tribolium castaneum TERT (TcTERT) and the reconstitution of the active T. castaneum telomerase ribonucleoprotein (RNP) complex in vitro.
Telomerase is a specialized reverse transcriptase1 that adds short DNA repeats, called telomeres, to the 3' end of linear chromosomes2 that serve to protect them from end-to-end fusion and degradation. Following DNA replication, a short segment is lost at the end of the chromosome3 and without telomerase, cells continue dividing until eventually reaching their Hayflick Limit4. Additionally, telomerase is dormant in most somatic cells5 in adults, but is active in cancer cells6 where it promotes cell immortality7.
The minimal telomerase enzyme consists of two core components: the protein subunit (TERT), which comprises the catalytic subunit of the enzyme and an integral RNA component (TER), which contains the template TERT uses to synthesize telomeres8,9. Prior to 2008, only structures for individual telomerase domains had been solved10,11. A major breakthrough in this field came from the determination of the crystal structure of the active12, catalytic subunit of T. castaneum telomerase, TcTERT1.
Here, we present methods for producing large quantities of the active, soluble TcTERT for structural and biochemical studies, and the reconstitution of the telomerase RNP complex in vitro for telomerase activity assays. An overview of the experimental methods used is shown in Figure 1.

In vitro Reconstitution of the Active T. castaneum Telomerase

Efforts to isolate the catalytic subunit of telomerase, TERT, in sufficient quantities for structural studies, have been met with limited success for more than a decade. Here, we present methods for the isolation of the recombinant Tribolium castaneum TERT (TcTERT) and the reconstitution of the active T. castaneum telomerase ribonucleoprotein (RNP) complex in vitro.

在体外重组活跃T。谷盗端粒酶

Efforts to isolate the catalytic subunit of telomerase, TERT, in sufficient quantities for structural studies, have been met with limited success for more ...

Efficient Agroinfiltration of Plants for High-level Transient Expression of Recombinant Proteins

Mammalian cell culture is the major platform for commercial production of human vaccines and therapeutic proteins. However, it cannot meet the increasing worldwide demand for pharmaceuticals due to its limited scalability and high cost. Plants have shown to be one of the most promising alternative pharmaceutical production platforms that are robust, scalable, low-cost and safe. The recent development of virus-based vectors has allowed rapid and high-level transient expression of recombinant proteins in plants. To further optimize the utility of the transient expression system, we demonstrate a simple, efficient and scalable methodology to introduce target-gene containing Agrobacterium into plant tissue in this study. Our results indicate that agroinfiltration with both syringe and vacuum methods have resulted in the efficient introduction of Agrobacterium into leaves and robust production of two fluorescent proteins; GFP and DsRed. Furthermore, we demonstrate the unique advantages offered by both methods. Syringe infiltration is simple and does not need expensive equipment. It also allows the flexibility to either infiltrate the entire leave with one target gene, or to introduce genes of multiple targets on one leaf. Thus, it can be used for laboratory scale expression of recombinant proteins as well as for comparing different proteins or vectors for yield or expression kinetics. The simplicity of syringe infiltration also suggests its utility in high school and college education for the subject of biotechnology. In contrast, vacuum infiltration is more robust and can be scaled-up for commercial manufacture of pharmaceutical proteins. It also offers the advantage of being able to agroinfiltrate plant species that are not amenable for syringe infiltration such as lettuce and Arabidopsis. Overall, the combination of syringe and vacuum agroinfiltration provides researchers and educators a simple, efficient, and robust methodology for transient protein expression. It will greatly facilitate the development of pharmaceutical proteins and promote science education.

Plants offer a novel system for the production of pharmaceutical proteins on a commercial scale that is more scalable, cost-efficient and safe than current expression paradigms. In this study, we report a simple and convenient, yet scalable approach to introduce target-gene containing Agrobacterium tumefaciens into plants for protein transient expression.

高级别瞬态表达重组蛋白的植物高效的农杆菌

Mammalian cell culture is the major platform for commercial production of human vaccines and therapeutic proteins. However, it cannot meet the increasing ...

Analysis of Global RNA Synthesis at the Single Cell Level following Hypoxia

Hypoxia or lowering of the oxygen availability is involved in many physiological and pathological processes. At the molecular level, cells initiate a particular transcriptional program in order to mount an appropriate and coordinated cellular response. The cell possesses several oxygen sensor enzymes that require molecular oxygen as cofactor for their activity. These range from prolyl-hydroxylases to histone demethylases. The majority of studies analyzing cellular responses to hypoxia are based on cellular populations and average studies, and as such single cell analysis of hypoxic cells are seldom performed. Here we describe a method of analysis of global RNA synthesis at the single cell level in hypoxia by using Click-iT RNA imaging kits in an oxygen controlled workstation, followed by microscopy analysis and quantification.&nbsp; Using cancer cells exposed to hypoxia for different lengths of time, RNA is labeled and measured in each cell. This analysis allows the visualization of temporal and cell-to-cell changes in global RNA synthesis following hypoxic stress.

We describe a technique for analysis of global RNA synthesis in hypoxia using imaging. Click-chemistry labeling of RNA has not previously been performed under hypoxia and allows visualization of global RNA changes at the single cell level. This approach complements the existing averaged RNA techniques, allowing direct visualization of cell-to-cell changes in global RNA synthesis.

全球合成的RNA在单细胞水平以下的低氧分析

Hypoxia or lowering of the oxygen availability is involved in many physiological and pathological processes. At the molecular level, cells initiate a ...

Measurement of Metabolic Rate in Drosophila using Respirometry

Metabolic disorders are a frequent problem affecting human health. Therefore, understanding the mechanisms that regulate metabolism is a crucial scientific task. Many disease causing genes in humans have a fly homologue, making Drosophila a good model to study signaling pathways involved in the development of different disorders. Additionally, the tractability of Drosophila simplifies genetic screens to aid in identifying novel therapeutic targets that may regulate metabolism. In order to perform such a screen a simple and fast method to identify changes in the metabolic state of flies is necessary. In general, carbon dioxide production is a good indicator of substrate oxidation and energy expenditure providing information about metabolic state. In this protocol we introduce a simple method to measure CO2 output from flies. This technique can potentially aid in the identification of genetic perturbations affecting metabolic rate.

Measurement of Metabolic Rate in Drosophila using Respirometry

Metabolic disorders are among one of the most common diseases in humans. The genetically tractable model organism D. melanogaster can be used to identify novel genes that regulate metabolism. This paper describes a relatively simple method which allows studying the metabolic rate in flies by measuring their CO2 production.

代谢率的测量<em&gt;果蝇</em&gt;使用呼吸运动

Metabolic disorders are a frequent problem affecting human health. Therefore, understanding the mechanisms that regulate metabolism is a crucial ...

High Yield Expression of Recombinant Human Proteins with the Transient Transfection of HEK293 Cells in Suspension

The art of producing recombinant proteins with complex post-translational modifications represents a major challenge for studies of structure and function. The rapid establishment and high recovery from transiently-transfected mammalian cell lines addresses this barrier and is an effective means of expressing proteins that are naturally channeled through the ER and Golgi-mediated secretory pathway. Here is one protocol for protein expression using the human HEK293F and HEK293S cell lines transfected with a mammalian expression vector designed for high protein yields. The applicability of this system is demonstrated using three representative glycoproteins that expressed with yields between 95-120 mg of purified protein recovered per liter of culture. These proteins are the human Fc&#947;RIIIa and the rat &#945;2-6 sialyltransferase, ST6GalI, both expressed with an N-terminal GFP fusion, as well as the unmodified human immunoglobulin G1 Fc. This robust system utilizes a serum-free medium that is adaptable for expression of isotopically enriched proteins and carbohydrates for structural studies using mass spectrometry and nuclear magnetic resonance spectroscopy. Furthermore, the composition of the N-glycan can be tuned by adding a small molecule to prevent certain glycan modifications in a manner that does not reduce yield.

Laboratory-scale production of eukaryotic proteins with appropriate post-translational modification represents a significant barrier. Here is a robust protocol with rapid establishment and turnaround for protein expression using a mammalian expression system. This system supports selective amino acid, selective labeling of proteins and small molecule modulators of glycan composition.