אנו מודים לשיה יו (Regeneron Pharmaceuticals) להתחלה מלמד אותנו את הטכניקה וHGD ד&quot;ר ראסל תומסון (אלברט איינשטיין לרפואה) להדרכה המתמדת שלו בהיבטים שונים של הטכנולוגיה. עבודה זו מומנה על ידי Hunter College, CUNY להתחיל את הקרנות ופרס NSF לחם IOS-1,249,166. אנו מודים NYULMC histopathology Core מרכז NYUCI תמיכת גרנט, NIH / NCI 5 P30CA16087-31 להיסטולוגיה בכבד עכבר.

<ol>
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החוקרים מצהירים כי אין להם אינטרסים כלכליים מתחרים.

כאשר מבוצע כהלכה, HGD הוא אמצעי בטוח ויעיל להפליא של משלוח transgene. השלבים הקריטיים לHGD המוצלח הם: 1) מספק את הכמות הנכונה של ה-DNA בנפח גדול של מי מלח רכב 2) לוריד הזנב של עכבר 3) בפחות מ -8 שניות. למרות התהליך של הזרקה עצמה ללא ספק דורש קצת מי...

מאז התיאור הראשון שלה על ידי יו et al. וג&#39;אנג et al., משלוח הידרודינמית גן (HGD) הפך לכלי רב ערך ללימוד תפקוד גן במערכות מכרסמים מודל 1, 2. הטכניקה כרוכה בהזרקה המהירה (5-7 שניות) בהיקפים גדולים (8-12% ממשקל גוף) של פתרון לוריד הזנב של עכברים כדי להקל על הספיגה של ה-DNA פלסמיד על ידי התאים של אברי מטרת 1, 2. תנאים אלו מובילים לביטוי גנים חזק בכבד ובביטוי פחות גנים בכליות, טחול, הריאות ולב. הזרקה של 10 מיקרוגרם פלסמיד pCMV-LacZ יכולה transfect ככל 40% מhepatocytes, מה שהופך HGD השיטה היעילה ביותר, לא ויראלי, in vivo מסירת הגן עד כה 1. בניגוד לנישאים נגיפיים, pDNA הוא קל להכנה, לא לעורר תגובה חיסונית במארח המכרסם 3 ואינו מהווה סיכון בריאותי על ידי recombining עם הסוףוירוסי ogenous. בנוסף, מאחר שמולקולות ה-DNA מועברות על ידי HGD לא צריכה אריזה, שיטה זו מתאימה למשלוח של כרומוזומים בקטריאלי מלאכותיים (BAC) גדולים כמו 150 KB 4. סוגים אחרים של מולקולות שכבר נמסרו על ידי שיטה הידרודינמית כוללים RNA 5-10, 11 morpholinos, חלבוני 12, 13 ומולקולות קטנות אחרות 12, 14. היתרונות והחסרונות של HGD על פני שיטות משלוח אחרות כבר נדונו בביקורות מצוינות בספרות 15-20 ומספר המחברים סיפק תיאור מפורט של ההליך 21-23. היכרות transgenes לעכברים על ידי HGD היא בטוחה ויעיל 1-3, 24 והשיטה נעשתה שימוש בחולדות עם הצלחה דומה 25. עם שינויים מסוימים, ניסויי הוכחה של הקונספט בוצעו בתרנגולות 26, ראבביטים 27 וחזירים 28, אם כי, vivo היישום בטכניקה זו בבעלי חיים גדולים יותר עדיין מהווה אתגר. בעת השימוש בשיטה זו, עוד הגבלה נפוצה היא שרבים מוקטורי הביטוי היונקים הזמינים חסרים את המרכיבים כדי להשיג רמה גבוהה מתמשכת, של ביטוי גנים. באמצעות פלסמיד, ביטוי גני pCMV לוק באברי המטרה ניכר כבר בעשר דקות לאחר HGD, לעומת זאת, רמת הביטוי הראשונית, הגבוהה יורדת בצורה חדה בשבוע שלאחר הזרקת 1 הראשון. ביטוי transgene ארוך טווח אפשרי בהתאם לאמרגן ואינטרון השתמש בפלסמיד עיצוב 3, 24 זריקות עם זאת, תחזוקה של ביטוי גנים ברמה הגבוהה דורשת לעתים קרובות חוזרות ונשנות. מסיבה זו, HGD עשוי להיות פחות מתאים ללמוד מחלות כרוניות שהן תוצאה של חשיפה ארוך טווח לחלבונים מזיקים או מוצרי חלבון. עם המגבלות האלה, HGD הוא כלי רב עוצמה במיוחד ללימוד פותפקיד tential של גן ואת ההשפעה שלו מוטציות in vivo, כמו גם את ההשפעות והרגולציה של חלבונים הטיפוליים ולהקמת מודלים של בעלי חיים למחלות (לסקירה, ראה 15). לדוגמא, HGD ניתן להשתמש כדי להקצות פונקציה לתחומים וחומצות אמינו של חלבונים על ידי החדרת בנפרד מבני גנים שונים לעכברים שהגנים המתאימים בנוקאאוט. יתר על כן, בטכניקה זו ניתן להשתמש בכל זן עכבר. פרוטוקול זה מתאר HGD בעכברים עם דגש על ההיבטים הטכניים הדרושים כדי להשיג transfection המוצלח: החדרת מחט נכונה לוריד, הזרקת הנפח ומהירות המשלוח. יישומה של שיטה זו בא לידי הביטוי במודל של עכברים של trypanosomiasis אפריקה, מחלה של בני אדם ובעלי חיים קטלנית 29, 30. בעוד כמה מינים של trypanosomes לגרום למחלות בבעלי חיים, רוב לא יכול לגרום למחלה בבני אדם בשל מולדת מתחמים חיסוניים בבגורמי עונג עילאי טבע דם הנקראים trypanosome ממס (TLFs) 29, 31 ב, 32. , ליפופרוטאינים אלה יוצרים הנקבוביות בצפיפות גבוהה (HDL) מכילים שני חלבונים ייחודיים, הפרימטים ספציפיים:. HPR, ליגנד, המאפשר את הספיגה של TLFs לtrypanosomes, ותתנצ-I, את רכיב ממס ביום 31 ב, 33-38 Trypanosoma rhodesiense brucei הוא מסוגל להדביק בני אדם בשל ביטוי של חלבון בסרום הקשורים התנגדות (SRA) שנקשר ומנטרל תתנצ-אני אדם 34, 39. בון TLF לא נוטרל על ידי SRA בשל תתנצ-חלבון מסתעף 40. כפי שדווח בעבר, באמצעות וקטור יונקים ביטוי (pRG977), ביטוי מהונדס של רכיבי TLF בון בעכברים מקנה הגנה מפני trypanosomes אדם זיהומיות 40. הנתונים שהוצגו כאן הנציג להדגים כיצד מסירת גן הידרודינמית ניתן להחיל כדי לחקור את ההשפעות הטיפוליות של חלבון.

<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>
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		<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>
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		<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

ביטוי יעיל של transgenes in vivo הוא בעלת חשיבות מכרעת בלימוד תפקוד גן ובפיתוח טיפולים למחלות. בשנים האחרונות, משלוח הידרודינמית גן (HGD) התפתחה כשיטת פשוטה, מהירה, בטוחה ויעילה לאספקת transgenes למכרסמים. טכניקה זו נשענת על הכוח שנוצר על ידי ההזרקה המהירה של כמויות גדולות של פתרון פיסיולוגי כדי להגדיל את החדירות של קרום תא של איברי perfused ובכך להעביר דנ&quot;א לתוך תאים. אחד היתרונות העיקריים של HGD הוא היכולת להציג transgenes לתאי יונקים באמצעות DNA עירום פלסמיד (pDNA). היכרות עם גן אקסוגני באמצעות פלסמיד היא מינימאלי מייגע, יעיל ביותר ובניגוד לנישאים נגיפיים, בטוח להפליא. HGD שימש בתחילה להעברת גנים לעכברים, הוא משמש כעת כדי לספק מגוון רחב של חומרים, כולל oligonucleotides, כרומוזומים מלאכותיים, רנ&quot;א, חלבונים ומולקולות קטנות לעכברים, חולדותו, במידה מוגבלת, בעלי חיים אחרים. פרוטוקול זה מתאר HGD בעכברים ומתמקד בשלושה היבטים מרכזיים של השיטה שהן קריטיים לביצוע ההליך בהצלחה: הכנסה נכונה של המחט לווריד, נפח ההזרקה ומהירות המשלוח. ניתנות דוגמאות כדי להראות את יישומה של שיטה זו לביטוי החולף של שני גנים המקודדים חלבונים מופרשים, הפרימטים ספציפיים, אפוליפופרוטאין LI (תתנצ-I) וחלבונים הקשורים לhaptoglobin (HPR).

מיקום נכון של המחט לוריד הזנב של העכבר (כפי שמודגם באיור 1) הוא תנאי הכרחי לאספקת transgene בהצלחה על ידי transfection מבוסס הידרודינמיקה. לעתים קרובות החלק המאתגר ביותר של הטכניקה, לעומת זאת, הוא השמירה של המחט בתוך וריד הזנב ללא תנועה כך שכל הנפח של הזריקה יכול להיות מ?...

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

בtransfection vivo של DNA עירום על ידי מסירת גן הידרודינמית מציג גנים לתוך הרקמה של בעלי חיים עם תגובה דלקתית מינימאלית. כמויות מספיקות של מוצר גן נוצרות באופן שתפקוד הגן והרגולציה, כמו גם מבנה חלבון ותפקוד ניתן לנתח.

ביטוי חולף של חלבונים על ידי הידרודינמית ג&#39;ין משלוח בעכברים

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

28.3K Views.  Hunter College, CUNY.  בtransfection vivo של DNA עירום על ידי מסירת גן הידרודינמית מציג גנים לתוך הרקמה של בעלי חיים עם תגובה דלקתית מינימאלית. כמויות מספיקות של מוצר גן נוצרות באופן שתפקוד הגן והרגולציה, כמו גם מבנה חלבון ותפקוד ניתן לנתח. 

Video: Transient Expression of Proteins by Hydrodynamic Gene Delivery in Mice

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.

הכנת ראשי בתרביות תאים hematopoietic ממח העצם Murine עבור 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 ...

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.

הכתמה של חלבונים עם ג&#39;ל Coomassie G-250 ללא חומצה אצטית ממס אורגני

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.

שימוש ג&#39;ין Pulser מערכת MXcell electroporation כדי Transfect תאים ראשוניים עם יעילות גבוהה

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.

שימוש מונה תא אוטומטי כדי לפשט את הביטוי מחקרים ג&#39;ין: siRNA מציאה הביטוי IL 4-Gene תלויים תאים Namalwa

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.

מדורים פרפין-Embedded קפואים של תסיסנית סקס שרירים

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.

ב הכינון במבחנה של ט פעילים castaneum שהטלומרז

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.

Agroinfiltration היעילה של צמחים לביטוי חולף ברמה גבוהה של חלבונים רקומביננטי

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.

ניתוח של גלובל RNA סינתזה ברמת התא בודד הבאות היפוקסיה

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.

מדידה של קצב חילוף החומרים ב<em&gt; דרוזופילה</em&gt; באמצעות Respirometry

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.