<ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> في المساء قبل أن تحول الخلايا لوحة ، 293T في الخلايا 6 3 - 5x10 / 6 cultureplate الأنسجة سم. ملاحظة : نحن نستخدم 293T الخلايا الخاصة بهم من أجل سهولة ترنسفكأيشن وخلايا الفيروس efficacyas المنتجة. هذه الخلايا هي نقص في التعبئة والتغليف للفيروس ما لم يتم إدخال المساعد البلازميد. </li><li style=";text-align:right;direction:rtl"> في صباح اليوم الأول ، وإزالة بلطف المتوسطة واستبدالها مع 4 293T الخلية التي تحتوي على 25 مل بفندق الكلوروكين ملم. وضعت في الحاضنة لمدة 1 ساعة. ملاحظة : لوحة يجب أن حوالي 80 ٪ متموجة. </li><li style=";text-align:right;direction:rtl"> وفي الوقت نفسه ، يعد فيروس صنع الخليط لمدة 2 لوحات في كل مرة ، في أنابيب 5 مل : <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> 2 × 10 ملغ بناء البلازميد فيروسات </li><li style=";text-align:right;direction:rtl"> 2 × 5 ملغ التعبئة والتغليف بناء (EcoPak) </li><li style=";text-align:right;direction:rtl"> 2 × 62 مل CaCl </li><li style=";text-align:right;direction:rtl"> كاملة إلى 1 مل العقيمة مع O 2 DDH ملاحظة : على الرغم من أن فيروسات البلازميد بترميز الجين الورمي المصالح وعلامة أ ، EcoPak بترميز هفوة بول - ENV. جنبا إلى جنب مع خلايا 293T ، فإنها تنتج الارتجاعي ecotropic (RV) محددة للخلايا فأر ، ولكن ليس معديا للخلايا البشرية. وقد تبين أن كلا الكلوروكين و 2 CaCl لزيادة الكفاءة ترنسفكأيشن. </li></ol></li><li style=";text-align:right;direction:rtl"> إضافة 1ml من sterileHBS 2X إلى مزيج من الحكمة انخفاض ، بينما vortexing بلطف الأنبوب. </li><li style=";text-align:right;direction:rtl"> إضافة إلى هذا الحل فورا لوحات 2 ، 1 مل لكل منهما ، بلطف ، قطرة قطرة. </li><li style=";text-align:right;direction:rtl"> وضع في حاضنة لل7-11 ساعات. </li><li style=";text-align:right;direction:rtl"> في المساء (7-11 ساعات. في وقت لاحق) ، وإزالة بلطف المتوسط ​​، وبلطف جدا استبدال مع 5 مل المتوسطة 293T الطازجة. وضعت في الحاضنة حتى الظهر ، في اليوم التالي. ملاحظة : هذه الخطوة الهامة ، كما تحتاج إلى خلع الكلوروكين من الخلايا. إذا كان يحتفظ بها لفترات طويلة من الزمن ، الكلوروكين هي سامة. الحل في لوحات تبدو غامضة ، وذلك بسبب هطول الأمطار ناعم جدا مثل الغبار ، من خليط ترنسفكأيشن. ملاحظة : من المهم القيام بكل التغييرات وسائل الاعلام مع الرفق المدقع ، كما تم توعية الخلايا التي الكلوروكين ، ويمكن فصل بسهولة من لوحة. </li><li style=";text-align:right;direction:rtl"> في اليوم التالي ، 18 إلى 24 ساعة. قبل استرداد فيروس (حوالي الظهر) ، وإزالة بلطف المتوسط ​​، وبلطف جدا استبدال مع 3 مل المتوسطة 293T الطازجة. استبدال في حاضنة O / N. </li><li style=";text-align:right;direction:rtl"> في صباح اليوم الثالث (18-24 ساعة. احقا) ، وتمتص برفق على شكل لوحات متوسطة مع حقنة 10 مل مزودة بإبرة G 18. هذا طاف يحتوي على الفيروس الارتجاعي. </li><li style=";text-align:right;direction:rtl"> تغيير الإبرة إلى حقنة تصفية 45 ملم ، وعكس عدة مرات حقنة لخلط الحل أيضا ، من خلال تمرير طاف التصفية ، وقسامة في cryotubes ملاحظة : بدلا من ذلك ، إذا كنت ترغب بجعل + 3 لوحات من الفيروس ، وتجمع كل supernatants من الفيروس نفسه في أنبوب 5 مل 0 المخروطية. المزيج جيدا ، ثم supernatants قسامة التي تحتوي على الفيروس الارتجاعي في cryotubes بواسطة التصفية. </li><li style=";text-align:right;direction:rtl"> يتم الاحتفاظ الأنابيب التي تحتوي على الفيروسات supernatants الكاملة في -80 درجة مئوية حتى استخدامها. </li></ol>

<ol>
	<li>DuBridge, R. B., Tang, P., Hsia, H. C., Leong, P. M., Miller, J. H., Calos, M. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Analysis+of+mutation+in+human+cells+by+using+an+Epstein-Barr+virus+shuttle+system.">Analysis of mutation in human cells by using an Epstein-Barr virus shuttle system.</a> Mol Cell Biol. 7, 379-387 (1987).</li><li>Cherry, S. R., Biniszkiewicz, D., van Parijs, L., Baltimore, D., Jaenisch, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Retroviral+expression+in+embryonic+stem+cells+and+hematopoietic+stem+cells.">Retroviral expression in embryonic stem cells and hematopoietic stem cells.</a> Mol Cell Biol. 20, 7419-7426 (2000).</li><li>Finer, M. H., Dull, T. J., Qin, L., Farson, D., Roberts, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=kat:+A+high-efficiency+retroviral+transduction+system+for+primary+human+T+lymphocytes.">kat: A high-efficiency retroviral transduction system for primary human T lymphocytes.</a> Blood. 83, 43-50 (1994).</li><li>Naviaux, R. K., Costanzi, E., Haas, M., Verma, I. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+pCL+vector+system:+rapid+production+of+helper-free,+high-titer,+recombinant+retroviruses.">The pCL vector system: rapid production of helper-free, high-titer, recombinant retroviruses.</a> J Virol. 70, 5701-5705 (1996).</li><li>Pear, W. S., Miller, J. P., Xu, L., Pui, J. C., Soffer, B., Quackenbush, R. C., Pendergast, A. M., Bronson, R., Aster, J. C., Scott, M. L., Baltimore, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Efficient+and+rapid+induction+of+a+chronic+myelogenous+leukemia-like+myeloproliferative+disease+in+mice+receiving+P210+bcr/abl-transduced+bone+marrow.">Efficient and rapid induction of a chronic myelogenous leukemia-like myeloproliferative disease in mice receiving P210 bcr/abl-transduced bone marrow.</a> Blood. 92, 3780-3792 (1998).</li><li>Pear, W. S., Nolan, G. P., Scott, M. L., Baltimore, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Production+of+high-titer+helper-free+retroviruses+by+transient+transfection.">Production of high-titer helper-free retroviruses by transient transfection.</a> Proc Natl Acad Sci USA. 90, 8392-8396 (1993).</li><li>Stocking, C., Kollek, R., Bergholz, U., Ostertag, W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Long+terminal+repeat+sequences+impart+hematopoietic+transformation+properties+to+the+myeloproliferative+sarcoma+virus.">Long terminal repeat sequences impart hematopoietic transformation properties to the myeloproliferative sarcoma virus.</a> Proc Natl Acad Sci USA. 82, 5746-5750 (1985).</li><li>Van Etten, R. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Models+of+chronic+myeloid+leukemia.">Models of chronic myeloid leukemia.</a> Curr Oncol Rep. 3, 228-237 (2001).</li><li>Van Etten, R. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Studying+the+pathogenesis+of+BCR-ABL++leukemia+in+mice.">Studying the pathogenesis of BCR-ABL+ leukemia in mice.</a> Oncogene. 21, 8643-8651 (2002).</li></ol>

وأربع نقاط حاسمة ضمان نجاح الأسهم الجيدة فيروسية : <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> الخلايا المنتجة 293T أن يكونوا أصحاء للغاية ، وهذا يعني أنهم قد انقسم على جدول منتظم للغاية ، لم تكن متضخمة ، ومطلية في كثافة الأمثل من 3،5-5٬000٬000 في 6 سم نسيج لوحة الثقافة ، بحيث ...

يجب على جميع الكواشف المستخدمة في ترنسفكأيشن تكون عقيمة مفلتر (CaCl 2 ، 2X HBS ، miliQ H 2 O) وأبقى العقيمة.

production of replication-defective retrovirus by transient transfection of 293t cells

لدينا مختبر دراسات الأمراض التي يسببها الإنسان من خلال التكاثر النقيي المسرطنة مثل BCR - ABL أو مستقبلات عامل النمو المشتق المسرطنة (ZNF198 - FGFR1 ، BCR - PDGFRα ، الخ). ونحن قادرون على نموذج ودراسة الأمراض التي تصيب البشر ، كما هو الحال في نموذج الفأر لدينا ، عن طريق زرع خلايا نخاع العظم المصاب سابقا مع الارتجاعي التعبير عن الجين الورمي في المصالح. النسخ المتماثل أو المعيبة الارتجاعي ترميز الجين الورمي الإنسان وتنتج علامة (GFP ، RFP ، والمضادات الحيوية الجينات المقاومة ، الخ) عن طريق بروتوكول ترنسفكأيشن عابرة باستخدام الخلايا 293T ، من حقوق الإنسان الكلوي خط الخلايا الظهارية تحويلها من قبل الجين المنتج E1A اتش. 293 الخلايا لديها خاصية غير معتادة للغاية التي يجري transfectable فوسفات الكالسيوم (كابو 4) ، مع ما يصل الى 50-80 ٪ كفاءة ترنسفكأيشن يمكن بلوغه بسهولة. هنا ، وشارك في 293 transfect نحن مع الخلايا ناقلات فيروسات التعبير عن الجين الورمي من الفائدة والبلازميد التي تعبر عن وظائف التغليف هفوة ، بول الحياة الفطرية ، مثل الجينوم واحدة والتغليف يبني القات أو PCL ، في هذه الحالة EcoPak البلازميد. كذلك تم تحسين ترنسفكأيشن الأولية باستخدام الكلوروكين. مخزونات فيروس ecotropic ، التي جمعت في 48 ساعة الثقافة طاف. بعد ترنسفكأيشن ، يمكن تخزينها في -80 درجة مئوية وتستخدم للعدوى من خطوط الخلوي في ضوء التحول والدراسات في المختبر ، أو الخلايا الأولية مثل خلايا فأر نخاع العظام ، التي يمكن استخدامها للزراعة في نموذج الفأر لدينا .

Watch this Scientific Journal Video about Production of Replication-Defective Retrovirus by Transient Transfection of 293T cells at JoVE.com

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Production of Replication-Defective Retrovirus by Transient Transfection of 293T cells

يوضح هذا الأسلوب وسيلة فعالة لإعداد النسخ المتماثل أو المعيبة مخزونات فيروس ترميز الجين الورمي الإنسان ، واستخدمت لاحقا لتحريض مرض التكاثر النقيي في نموذج الفأر.

إنتاج النسخ المعيبة للفيروسات الارتدادية التي ترنسفكأيشن عابر للخلايا 293T

Our lab studies human myeloproliferative diseases induced by such oncogenes as Bcr-Abl or growth factor receptor-derived oncogenes (ZNF198-FGFR1, ...

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19.5K Views.  Tufts University. يوضح هذا الأسلوب وسيلة فعالة لإعداد النسخ المتماثل أو المعيبة مخزونات فيروس ترميز الجين الورمي الإنسان ، واستخدمت لاحقا لتحريض مرض التكاثر النقيي في نموذج الفأر.

Video: Production of Replication-Defective Retrovirus by Transient Transfection of 293T cells

Gene-gun Transfection of Hippocampal Neurons

Hi, I'm Kma. I work in Case Lab at Brown University Clean Slicer stage with 70%ethanol. Place plate insert into six.Well plate with medium and incubate at 37 degree whole brain with tweezers between midbrain and four brainin. Isolate hippocampus on one side, isolate hippocampus from the second side. Place hippocampi onto A PBS drop.Aspirate out the PBS make sagittal sections using the tissue slicer. Repeat transfer slicers onto a perish by squatting with PBS wash sections by adding and aspirating PBS and medium gently. Separate sections with tweezers.Wash sections with PBS and media. Again, transfer sections onto the plate and insert. Aspirate out the media in sections using tweezers.Attach gene gun hose to the helium cylinder. Attach barrel to gene gun. Fill the magazine with bullets.Insert magazine into the Jing gun. Adjust the pressure on the helium tank shoot. EGFP coated beads onto the sections.And now.

مدفع الجينات ترنسفكأيشن من الخلايا العصبية قرن آمون

A Method For Production of Recombinant mCD1d Protein in Insect Cells.

CD1 proteins constitute a third class of antigen-presenting molecules. They are cell surface glycoproteins, expressed as approximately 50-kDa glycosylated heavy chains that are noncovalently associated with beta2-microglobulin. They bind lipids rather than peptides. Although their structure confirms the similarity of CD1 proteins to MHC class I and class II antigen presenting molecules, the mCD1d groove is relatively narrow, deep, and highly hydrophobic and it has two binding pockets instead of the several shallow pockets described for the classical MHC-encoded antigen-presenting molecules. Based upon their amino acid sequences, such a hydrobphobic groove provides an ideal environment for the binding of lipid antigens. The Natural Killer T (NKT) cells use their TCR to recognize glycolipids bound to or presented by CD1d. T cells reactive to lipids presented by CD1 have been involved in the protection against autoimmune and infectious diseases and in tumor rejection. Thus, the ability to identify, purify , and track the response of CD1-reactive NKT cell is of great importance . The generation of tetramers of alpha Galactosyl ceramide (a-Galcer) with CD1d has significant insight into the biology of NKT cells. Tetramers constructed from other CD1 molecules have also been generated and these new reagents have greatly expanded the knowledge of the functions of lipid-reactive T cells, with potential use in monitoring the response to lipid-based vaccines and in the diagnosis of autoimmune diseases and other treatments.

A Method to prepare Insect cells and infect them with baculovirus for the the purpose of production of recombinant mCD1d proteinand generating mCD1d tetramers.

وهناك طريقة للحصول على إنتاج بروتين المؤتلف mCD1d في خلايا الحشرات.

CD1 proteins constitute a third class of antigen-presenting molecules. They are cell surface glycoproteins, expressed as approximately 50-kDa glycosylated ...

Production of Transgenic Xenopus laevis by Restriction Enzyme Mediated Integration and Nuclear Transplantation

Stable integration of cloned gene products into the Xenopus genome is necessary to control the time and place of expression, to express genes at later stages of embryonic development, and to define how enhancers and promoters regulate gene expression within the embryo. The protocol demonstrated here can be used to efficiently produce transgenic Xenopus laevis embryos. This transgenesis approach involves three parts: 1. Sperm nuclei are isolated from adult X. laevis testis by treatment with lysolecithin, which permeabilizes the sperm plasma membrane. 2. Egg extract is prepared by low speed centrifugation, addition of calcium to cause the extract to progress to interphase of the cell cycle, and a high-speed centrifugation to isolate interphase cytosol. 3. Nuclear transplantation: the nuclei and extract are combined with the linearized plasmid DNA to be introduced as the transgene and a small amount of restriction enzyme. During a short reaction, egg extract partially decondenses the sperm chromatin and the restriction enzyme generates chromosomal breaks that promote recombination of the transgene into the genome. The treated sperm nuclei are then transplanted into unfertilized eggs. Integration of the transgene usually occurs prior to the first embryonic cleavage such that the resulting embryos are not chimeric. These embryos can be analyzed without any need to breed to the next generation, allowing for efficient and rapid generation of transgenic embryos for analyses of promoter and gene function. Adult X. laevis resulting from this procedure also propagate the transgene through the germline and can be used to generate lines of transgenic animals for multiple purposes.

Production of Transgenic Xenopus laevis by Restriction Enzyme Mediated Integration and Nuclear Transplantation

This video protocol demonstrates a method for generating transgenic Xenopus laevis by introduction of transgenes into sperm nuclei followed by nuclear transplantation into unfertilized eggs.

إنتاج المعدلة وراثيا القيطم المورق عن طريق تقييد أنزيم التكامل وساطة وزرع النووية

Stable integration of cloned gene products into the Xenopus genome is necessary to control the time and place of expression, to express genes at later ...

Optimized Transfection Strategy for Expression and Electrophysiological Recording of Recombinant Voltage-Gated Ion Channels in HEK-293T Cells

The in vitro expression and electrophysiological recording of recombinant voltage-gated ion channels in cultured human embryonic kidney cells (HEK-293T) is a ubiquitous research strategy. HEK-293T cells must be plated onto glass coverslips at low enough density so that they are not in contact with each other in order to allow for electrophysiological recording without confounding effects due to contact with adjacent cells. Transfected channels must also express with high efficiency at the plasma membrane for whole-cell patch clamp recording of detectable currents above noise levels. Heterologous ion channels often require long incubation periods at 28&deg;C after transfection in order to achieve adequate membrane expression, but there are increasing losses of cell-coverslip adhesion and membrane stability at this temperature. To circumvent this problem, we developed an optimized strategy to transfect and plate HEK-293T cells. This method requires that cells be transfected at a relatively high confluency, and incubated at 28&deg;C for varying incubation periods post-transfection to allow for adequate ion channel protein expression. Transfected cells are then plated onto glass coverslips and incubated at 37&deg;C for several hours, which allows for rigid cell attachment to the coverslips and membrane restabilization. Cells can be recorded shortly after plating, or can be transferred to 28&deg;C for further incubation. We find that the initial incubation at 28&deg;C, after transfection but before plating, is key for the efficient expression of heterologous ion channels that normally do not express well at the plasma membrane. Positively transfected, cultured cells are identified by co-expressed eGFP or eGFP expressed from a bicistronic vector (e.g. pIRES2-EGFP) containing the recombinant ion channel cDNA just upstream of an internal ribosome entry site and an eGFP coding sequence. Whole-cell patch clamp recording requires specialized equipment, plus the crafting of polished recording electrodes and L-shaped ground electrodes from borosilicate glass. Drug delivery to study the pharmacology of ion channels can be achieved by directly micropipetting drugs into the recording dish, or by using microperfusion or gravity flow systems that produce uninterrupted streams of drug solution over recorded cells.

Reliable method for highly efficient in vitro expression and subsequent electrophysiological recording of recombinant voltage-gated ion channels in cultured human embryonic kidney cells (HEK-293T).

الاستراتيجية الأمثل للتعبير وترنسفكأيشن تسجيل الكهربية المؤتلف من القنوات ايون الجهد بوابات - 293T كلوة الجنين البشري في خلايا

The in vitro expression and electrophysiological recording of recombinant voltage-gated ion channels in cultured human embryonic kidney cells (HEK-293T) ...

In vitro Transcription and Capping of Gaussia Luciferase mRNA Followed by HeLa Cell Transfection

In vitro transcription is the synthesis of RNA transcripts by RNA polymerase from a linear DNA template containing the corresponding promoter sequence (T7, T3, SP6) and the gene to be transcribed (Figure 1A). A typical transcription reaction consists of the template DNA, RNA polymerase, ribonucleotide triphosphates, RNase inhibitor and buffer containing Mg2+ ions.
Large amounts of high quality RNA are often required for a variety of applications. Use of in vitro transcription has been reported for RNA structure and function studies such as splicing1, RNAi experiments in mammalian cells2, antisense RNA amplification by the "Eberwine method"3, microarray analysis4 and for RNA vaccine studies5. The technique can also be used for producing radiolabeled and dye labeled probes6. Warren, et al. recently reported reprogramming of human cells by transfection with in vitro transcribed capped RNA7. The T7 High Yield RNA Synthesis Kit from New England Biolabs has been designed to synthesize up to 180 &mu;g RNA per 20 &mu;l reaction. RNA of length up to 10kb has been successfully transcribed using this kit. Linearized plasmid DNA, PCR products and synthetic DNA oligonucleotides can be used as templates for transcription as long as they have the T7 promoter sequence upstream of the gene to be transcribed.
Addition of a 5' end cap structure to the RNA is an important process in eukaryotes. It is essential for RNA stability8, efficient translation9, nuclear transport10 and splicing11. The process involves addition of a 7-methylguanosine cap at the 5' triphosphate end of the RNA. RNA capping can be carried out post-transcriptionally using capping enzymes or co-transcriptionally using cap analogs. In the enzymatic method, the mRNA is capped using the Vaccinia virus capping enzyme12,13. The enzyme adds on a 7-methylguanosine cap at the 5' end of the RNA using GTP and S-adenosyl methionine as donors (cap 0 structure). Both methods yield functionally active capped RNA suitable for transfection or other applications14 such as generating viral genomic RNA for reverse-genetic systems15 and crystallographic studies of cap binding proteins such as eIF4E16.
In the method described below, the T7 High Yield RNA Synthesis Kit from NEB is used to synthesize capped and uncapped RNA transcripts of Gaussia luciferase (GLuc) and Cypridina luciferase (CLuc). A portion of the uncapped GLuc RNA is capped using the Vaccinia Capping System (NEB). A linearized plasmid containing the GLuc or CLuc gene and T7 promoter is used as the template DNA. The transcribed RNA is transfected into HeLa cells and cell culture supernatants are assayed for luciferase activity. Capped CLuc RNA is used as the internal control to normalize GLuc expression.

In vitro Transcription and Capping of Gaussia Luciferase mRNA Followed by HeLa Cell Transfection

This method describes high yield in vitro synthesis of both capped and uncapped mRNA from a linearized plasmid containing the Gaussia luciferase (GLuc) gene. The RNA is purified and a fraction of the uncapped RNA is enzymatically capped using the Vaccinia virus capping enzyme. In the final step, the mRNA is transfected into HeLa cells and cell culture supernatants are assayed for luciferase activity.

في المختبر، والسد النسخ من مرنا luciferase المراسل Gaussia تلاه ترنسفكأيشن الخلية هيلا

In vitro transcription is the synthesis of RNA transcripts by RNA polymerase from a linear DNA template containing the corresponding promoter sequence ...

Protein Transfection of Mouse Lung

Increasing protein expression enables researchers to better understand the functional role of that protein in regulating key biological processes1. In the lung, this has been achieved typically through genetic approaches that utilize transgenic mice2,3 or viral or non-viral vectors that elevate protein levels via increased gene expression4. Transgenic mice are costly and time-consuming to generate and the random insertion of a transgene or chronic gene expression can alter normal lung development and thus limit the utility of the model5. While conditional transgenics avert problems associated with chronic gene expression6, the reverse tetracycline-controlled transactivator (rtTA) mice, which are used to generate conditional expression, develop spontaneous air space enlargement7. As with transgenics, the use of viral and non-viral vectors is expensive8 and can provoke dose-dependent inflammatory responses that confound results9 and hinder expression10. Moreover, the efficacy of repeated doses are limited by enhanced immune responses to the vector11,12. Researchers are developing adeno-associated viral (AAV) vectors that provoke less inflammation and have longer expression within the lung13.
Using &beta;-galactosidase, we present a method for rapidly and effectively increasing protein expression within the lung using a direct protein transfection technique. This protocol mixes a fixed amount of purified protein with 20 &mu;l of a lipid-based transfection reagent (Pro-Ject, Pierce Bio) to allow penetration into the lung tissue itself. The liposomal protein mixture is then injected into the lungs of the mice via the trachea using a microsprayer (Penn Century, Philadelphia, PA). The microsprayer generates a fine plume of liquid aerosol throughout the lungs. Using the technique we have demonstrated uniform deposition of the injected protein throughout the airways and the alveoli of mice14. The lipid transfection technique allows the use of a small amount of protein to achieve effect. This limits the inflammatory response that otherwise would be provoked by high protein administration. Indeed, using this technique we published that we were able to significantly increase PP2A activity in the lung without affecting lung lavage cellularity15. Lung lavage cellularity taken 24 hr after challenge was comparable to controls (27&plusmn;4 control vs. 31&plusmn;5 albumin transfected; N=6 per group). Moreover, it increases protein levels without inducing lung developmental changes or architectural changes that can occur in transgenic models. However, the need for repeated administrations may make this technique less favorable for studies examining the effects of long-term increases in protein expression. This would be particularly true for proteins with short half-lives.

Transgenic mice or viral vectors have been used to increase protein expression within the lung. However, these techniques are time-consuming, technically challenging and have off-target effects that can confound results. Our protein transfection protocol uses a lipid based transfection reagent and an ultrafine microsprayer to uniformly deliver active protein to lung cells.

ترنسفكأيشن البروتين من الرئة ماوس

Increasing protein expression enables researchers to  better understand the functional role of that protein in regulating key  biological processes1. In ...

Optimization and Utilization of Agrobacterium-mediated Transient Protein Production in Nicotiana

Agrobacterium-mediated transient protein production in plants is a promising approach to produce vaccine antigens and therapeutic proteins within a short period of time. However, this technology is only just beginning to be applied to large-scale production as many technological obstacles to scale up are now being overcome. Here, we demonstrate a simple and reproducible method for industrial-scale transient protein production based on vacuum infiltration of Nicotiana plants with Agrobacteria carrying launch vectors. Optimization of Agrobacterium cultivation in AB medium allows direct dilution of the bacterial culture in Milli-Q water, simplifying the infiltration process. Among three tested species of Nicotiana, N. excelsiana (N. benthamiana &#215; N. excelsior) was selected as the most promising host due to the ease of infiltration, high level of reporter protein production, and about two-fold higher biomass production under controlled environmental conditions. Induction of Agrobacterium harboring pBID4-GFP (Tobacco mosaic virus-based) using chemicals such as acetosyringone and monosaccharide had no effect on the protein production level. Infiltrating plant under 50 to 100 mbar for 30 or 60 sec resulted in about 95% infiltration of plant leaf tissues. Infiltration with Agrobacterium laboratory strain GV3101 showed the highest protein production compared to Agrobacteria laboratory strains LBA4404 and C58C1 and wild-type Agrobacteria strains at6, at10, at77 and A4. Co-expression of a viral RNA silencing suppressor, p23 or p19, in N. benthamiana resulted in earlier accumulation and increased production (15-25%) of target protein (influenza virus hemagglutinin).

Optimization and Utilization of Agrobacterium-mediated Transient Protein Production in Nicotiana

Transient protein production in Nicotiana plants based on vacuum infiltration with Agrobacteria carrying launch vectors (Tobacco mosaic virus-based) is a rapid and economic approach to produce vaccine antigens and therapeutic proteins. We simplified the procedure and improved target accumulation by optimizing conditions of bacteria cultivation, selecting host species, and co-introducing RNA silencing suppressors.

الأمثل والاستفادة من<em&gt; الأجرعية</em&gt; بوساطة إنتاج بروتين عابر في<em&gt; نيكوتيانا</em

Agrobacterium-mediated transient protein production in plants is a promising approach to produce vaccine antigens and therapeutic proteins within a short ...

Transient Expression of Proteins by Hydrodynamic Gene Delivery in Mice

Efficient expression of transgenes in vivo is of critical importance in studying gene function and developing treatments for diseases. Over the past years, hydrodynamic gene delivery (HGD) has emerged as a simple, fast, safe and effective method for delivering transgenes into rodents. This technique relies on the force generated by the rapid injection of a large volume of physiological solution to increase the permeability of cell membranes of perfused organs and thus deliver DNA into cells. One of the main advantages of HGD is the ability to introduce transgenes into mammalian cells using naked plasmid DNA (pDNA). Introducing an exogenous gene using a plasmid is minimally laborious, highly efficient and, contrary to viral carriers, remarkably safe. HGD was initially used to deliver genes into mice, it is now used to deliver a wide range of substances, including oligonucleotides, artificial chromosomes, RNA, proteins and small molecules into mice, rats and, to a limited degree, other animals. This protocol describes HGD in mice and focuses on three key aspects of the method that are critical to performing the procedure successfully: correct insertion of the needle into the vein, the volume of injection and the speed of delivery. Examples are given to show the application of this method to the transient expression of two genes that encode secreted, primate-specific proteins, apolipoprotein L-I (APOL-I) and haptoglobin-related protein (HPR).

In vivo transfection of naked DNA by hydrodynamic gene delivery introduces genes into the tissue of an animal with minimal inflammatory response. Sufficient amounts of gene product are generated such that gene function and regulation as well as protein structure and function can be analyzed.

التعبير عابرة من البروتينات عن طريق هيدرودينامي الجينات في الفئران التسليم

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

In Vivo 4-Dimensional Tracking of Hematopoietic Stem and Progenitor Cells in Adult Mouse Calvarial Bone Marrow

Through a delicate balance between quiescence and proliferation, self renewal and production of differentiated progeny, hematopoietic stem cells (HSCs) maintain the turnover of all mature blood cell lineages. The coordination of the complex signals leading to specific HSC fates relies upon the interaction between HSCs and the intricate bone marrow microenvironment, which is still poorly understood[1-2].
We describe how by combining a newly developed specimen holder for stable animal positioning with multi-step confocal and two-photon in vivo imaging techniques, it is possible to obtain high-resolution 3D stacks containing HSPCs and their surrounding niches and to monitor them over time through multi-point time-lapse imaging. High definition imaging allows detecting ex vivo labeled hematopoietic stem and progenitor cells (HSPCs) residing within the bone marrow. Moreover, multi-point time-lapse 3D imaging, obtained with faster acquisition settings, provides accurate information about HSPC movement and the reciprocal interactions between HSPCs and stroma cells.
Tracking of HSPCs in relation to GFP positive osteoblastic cells is shown as an exemplary application of this method. This technique can be utilized to track any appropriately labeled hematopoietic or stromal cell of interest within the mouse calvarium bone marrow space.

In Vivo 4-Dimensional Tracking of Hematopoietic Stem and Progenitor Cells in Adult Mouse Calvarial Bone Marrow

The nature of the interactions between hematopoietic stem and progenitor cells (HSPCs) and bone marrow niches is poorly understood. Custom hardware modifications and a multi-step acquisition protocol allow the use of two-photon and confocal microscopy to image ex vivo labeled HSPCs homed within bone marrow areas, tracking interactions and movement.

في فيفو تتبع 4 الأبعاد للالجذعية المكونة للدم والسلف الكبار في خلايا الفأر قبي نخاع العظم

Through a delicate balance between quiescence and proliferation, self renewal and production of differentiated progeny, hematopoietic stem cells (HSCs) ...

Production of Haploid Zebrafish Embryos by In Vitro Fertilization

The zebrafish has become a mainstream vertebrate model that is relevant for many disciplines of scientific study. Zebrafish are especially well suited for forward genetic analysis of developmental processes due to their external fertilization, embryonic size, rapid ontogeny, and optical clarity &#8211; a constellation of traits that enable the direct observation of events ranging from gastrulation to organogenesis with a basic stereomicroscope. Further, zebrafish embryos can survive for several days in the haploid state. The production of haploid embryos in vitro is a powerful tool for mutational analysis, as it enables the identification of recessive mutant alleles present in first generation (F1) female carriers following mutagenesis in the parental (P) generation. This approach eliminates the necessity to raise multiple generations (F2, F3, etc.) which involves breeding of mutant families, thus saving the researcher time along with reducing the needs for zebrafish colony space, labor, and the husbandry costs. Although zebrafish have been used to conduct forward screens for the past several decades, there has been a steady expansion of transgenic and genome editing tools. These tools now offer a plethora of ways to create nuanced assays for next generation screens that can be used to further dissect the gene regulatory networks that drive vertebrate ontogeny. Here, we describe how to prepare haploid zebrafish embryos. This protocol can be implemented for novel future haploid screens, such as in enhancer and suppressor screens, to address the mechanisms of development for a broad number of processes and tissues that form during early embryonic stages.

Production of Haploid Zebrafish Embryos by In Vitro Fertilization

The zebrafish is a powerful model system for developmental biology and human disease research due to their genetic similarity with higher vertebrates. This protocol describes a methodology to create haploid zebrafish embryos that can be utilized for forward screen strategies to identify recessive mutations in genes essential for early embryogenesis.

إنتاج فرداني الزرد الأجنة عن طريق<em&gt; في المختبر</em&gt; التسميد

The zebrafish has become a mainstream vertebrate model that is relevant for many disciplines of scientific study. Zebrafish are especially well suited for ...

إنتاج النسخ المعيبة للفيروسات الارتدادية التي ترنسفكأيشن عابر للخلايا 293T

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