אנו מודים בני הזוג. Richard H. Masland ו Akimichi Kaneko שנתן לנו עצות ערך והצעות להקים את הליך הכנת הפרוסה האופקי של הרשתית.

<ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> הכן לחסום אגר (30 מ&quot;ג / מ&quot;ל, 3%, כלומר במים מזוקקים). ממיסים במיקרוגל ועל זה קודם ושופכים אותו לתוך צלחת זכוכית. שמור את המנה במקרר ב 4 o C. טיפ: הבלוק אגר אמור להיות מוכן מראש. </li><li style=";text-align:right;direction:rtl"> הכן בטמפרטורה נמוכה ההיתוך agarose ג&#39;ל (25 מ&quot;ג / מ&quot;ל, 2.5% כלומר, בינוני). ממיסים במיקרוגל ועל זה. שמור את זה באמבט מים חמים על 35 ° C. טיפ: שמרו על ג&#39;ל agarose לא חם מדי. אם זה חם מדי, זה לוקח זמן רב להיות הקרושה, ג&#39;ל עשוי להרוג את הרשתית . </li><li style=";text-align:right;direction:rtl"> להרדים את enucleate, חיה גלגל העין ופתח אותו כמו עיינית. כדי לנזל הומור זגוגי, עיינית נפתחה ספוגה במשך 10 דקות ב hyaluronidase במדיום (0.07 מ&quot;ג / מ&quot;ל), אם בהכרח. </li><li style=";text-align:right;direction:rtl"> חותכים את אגר לגוש (למשל, 1 ס&quot;מ X 1.5 ס&quot;מ הרשתית העכבר) ו מחובר היטב על ידי דבק מיידית על הבמה vibratome. שמור את בלוק אגר רטוב. </li><li style=";text-align:right;direction:rtl"> מניחים את להב ב 5 מעלות על מבצעה. בעדינות לחתוך את המשטח העליון של לחסום את אגר במהירות של כ. 50 מיקרומטר / sec, freq. 50 הרץ. טיפ: ודאו כי המשטח העליון של לחסום את אגר חלקה לגמרי שטוח. כמה חתכים (לפחות 3 פעמים) עשוי להיות נחוץ כדי לקבל את משטח חלק ושטוח של גוש אגר. </li><li style=";text-align:right;direction:rtl"> שוטפים את עיינית עם המדיום ללא hyaluronidase. לבודד את הרשתית של אפיתל הפיגמנט ולמקם אותו photoreceptor בצד על נייר הסינון. כדי בתוקף לצרף את הרשתית לנייר סינון, ואקום הרשתית על הנייר מסנן מספר פעמים. טיפ: ודא הרשתית מחובר נייר הסינון שטוח לחלוטין. לאחר לשים הרשתית על הנייר לסנן, לחתוך את נייר הסינון עודף סביב הרשתית (Fig.2A). העיתון לסנן עודף לעתים קרובות מונע להב מללכת לתוך שכבת המתאים של הרשתית. </li><li style=";text-align:right;direction:rtl"> נגב בעדינות את עודף בינוני ברחוב אגר ובזהירות המקום הרשתית על הנייר סינון לחסום את אגר. כדי בתוקף במקום נייר סינון לחסום את אגר, דבק לצרף מיידית על קצה נייר הסינון. עצה: כדי להימנע סדק unexpectable, המקום הרשתית כחזית ככל האפשר על פני השטח העליון של לחסום את אגר. </li><li style=";text-align:right;direction:rtl"> יוצקים בעדינות את הג&#39;ל בטמפרטורה נמוכה ההיתוך agarose על הרשתית. חכו דקות 1 בעדינות לשפוך את המדיום בו כדי לצנן אותה. הג&#39;ל הופך agarose הקרושה במהירות. טיפ: חם מדי agarose ג&#39;ל הורג את הרשתית. </li><li style=";text-align:right;direction:rtl"> הרם את עמדת להב מיקרומטר כמה מאות מעל המשטח העליון של גוש אגר בעדינות לחתוך את החלק העליון של הקרושה agarose ג&#39;ל. </li><li style=";text-align:right;direction:rtl"> תחתון למטה את המיקום להב. חותכים את הרשתית ברמה של הפרוקסימלית שליש שכבת הגרעין הפנימית (בערך בין 200 לבין 250 מיקרומטר מעל המשטח העליון של גוש אגר). טיפ: מהירות רבה מדי של הלהב יפגע קשות ברשתית. כ. 50 מיקרומטר / sec (50 הרץ) המתאים. </li><li style=";text-align:right;direction:rtl"> שימו לב כי תאים amacrine עכשיו עם הפנים כלפי מטה. בזהירות להרים את הפרוסה של הרשתית יחד עם הקרושה agarose ג&#39;ל ולמקם אותו עם הפנים כלפי מעלה בתא או צלחת. טיפ: מכיוון הרשתית העכבר הזעיר וגלי, קשה לקבל פרוסת אופקי מושלמת שכבת המתאים. פרוסת &quot;עקיפה&quot; עשוי להיות שיטה חלופית כדי לקבל את פרוסת שטוח יחסית של הרשתית. כדי לקבל את פרוסת אלכסונית, לשים עוד נייר מסנן בין הרשתית על הנייר לסנן את הבלוק אגר כפי שמוצג Fig.2B. למרות שלא ניתן לצפות פרוסת אופקי מושלם, תמיד יש כמה תחומים שבהם סומה תא amacrine הוא על פני השטח של הפרוסה. </li></ol>

<ol>
	<li>Azuma, T., Enoki, R., Iwamuro, K., Kaneko, A., Koizumi, A., Koizumi, A., TC, J. a. k. o. b. s., Masland, R. H., MA, M. a. c. N. e. i. l., RH, M. a. s. l. a. n. d. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Multiple+spatiotemporal+patterns+of+dendritic+Ca2++signals+in+goldfish+retinal+amacrine+cells.">Multiple spatiotemporal patterns of dendritic Ca2+ signals in goldfish retinal amacrine cells.</a> Brain Res. , 64-73 (2004).</li></ol>

כל הפרוטוקולים הניסוי נערכו על פי המכון הלאומי לבריאות הנחיות לשימוש בבעלי חיים.

ישנם מספר יתרונות חשובים של הכנת החתך האופקי של הרשתית. ראשית, מורפולוגיה של תאים דנדריטים להרחיב את אופקי, כגון תאים amacrine תאים אופקיים, נשמר. הוכח כי קיימים מעל 20 סוגים של תאים amacrine ברשתית (מקניל ו Masland, 1998), ולכן חשוב מאוד להשוות את המורפולוגיה של התאים ע...

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">	
		
		<div>
		<table border="1">
		<thead>
		<tr>
		<th>Material Name</th>
		<th>Type</th>
		<th>Company</th>
		<th>Catalogue Number</th>
		<th>Comment</th>
		</tr>
		</thead>
		<tbody>
		
<tr>
<td>Agar</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>A-1296</td>
<td>&nbsp;</td>
<tr>
<td>Agarose L</td>
<td>&nbsp;</td>
<td>Wako</td>
<td>317-01182</td>
<td>Low-temperature melting agarose </td>
</tr>
<tr>
<td>Hyaluronidase</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>&nbsp;</td>
<td>Type I-S, 300 units/mg</td>
</tr>
<tr>
<td>Medium</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>in mM: 102 NaCl, 3.1 KCl, 2.0 CaCl2, 1.0 MgCl2, 23 NaHCO3, and 10 glucose, maintained at pH 7.8, or, Ames&#x2019; Solution (Sigma)</td>
</tr>
<tr>
<td>Microwave</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Hot water bath</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>35 C</td>
</tr>
<tr>
<td>Vibratome slicer</td>
<td>&nbsp;</td>
<td>Leica</td>
<td>VT1000S</td>
<td>&nbsp;</td>
<tr>
<td>MF-Membrane filters</td>
<td>&nbsp;</td>
<td>Millipore</td>
<td>HAWP01300</td>
<td>Filter paper , pore size 0.45 um</td>
</tr>
<tr>
<td>Dissection tools</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>forceps, blade, pinch, twizzer, etc.</td>
</tr>
<tr>
<td>Instant glue</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>eg., Alonalpha, Krazy Glu</td>
</tr>
<tr>
<td>50 ml syringe</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>syringe filter</td>
<td>&nbsp;</td>
<td>Millipore</td>
<td>SX0001300</td>
<td>&nbsp;</td>		</tbody>
		</table>
		</div>

horizontal slice preparation of the retina

באופן מסורתי פרוסה האנכי והכנת כל הר של הרשתית שימשו ללימוד פונקציה של מעגלים הרשתית. עם זאת, רבים של נוירונים ברשתית, כגון תאים amacrine, להרחיב הדנדריטים שלהם בצורה אופקית, כך מורפולוגיה של תאים אמור להינזק קשות פרוסות אנכי. לקראת כל הר, במיוחד עבור תיקון-clamp הקלטות, הנוירונים ברשתית בשכבת הביניים אינם נגישים בקלות בשל הסיקור הנרחב של גליה (תאים מולר) endfeets של התא. כאן, אנו מתארים את הרומן חיתוך שיטה לשמר את המורפולוגיה הדנדריטים של נוירונים ברשתית ללא פגע. פרוסה נעשתה אופקית על השכבה הפנימית של הרשתית באמצעות מבצעה vibratome אחרי הרשתית היה מוטבע נמוכה טמפרטורת ההתכה agarose ג&#39;ל. בהכנה זו פרוסה האופקי של הרשתית, למדנו את תפקוד הנוירונים ברשתית בהשוואה המורפולוגיה שלהם, באמצעות תיקון-clamp הקלטה, טכניקת הדמיה סידן, immunocytochemistry, ואת תא בודד RT-PCR.

Watch this Scientific Journal Video about Horizontal Slice Preparation of the Retina at JoVE.com

Horizontal Slice Preparation of the Retina

באופן מסורתי פרוסה האנכי והכנת כל הר של הרשתית שימשו ללימוד פונקציה של מעגלים הרשתית. כאן, אנו מתארים את הרומן חיתוך שיטה לשמר את המורפולוגיה הדנדריטים של נוירונים ברשתית ללא פגע.

פורסים הכנה אופקי של הרשתית

Traditionally the vertical slice and the whole-mount preparation of the retina have been used to study the function of retinal circuits. However, many of ...

horizontal-slice-preparation-of-the-retina

Research

JoVE Journal

Biology

15.7K Views.  Dalhousie University. באופן מסורתי פרוסה האנכי והכנת כל הר של הרשתית שימשו ללימוד פונקציה של מעגלים הרשתית. כאן, אנו מתארים את הרומן חיתוך שיטה לשמר את המורפולוגיה הדנדריטים של נוירונים ברשתית ללא פגע.

Video: Horizontal Slice Preparation of the Retina

Light/dark Transition Test for Mice

Although all of the mouse genome sequences have been determined, we do not yet know the functions of most of these genes. Gene-targeting techniques, however, can be used to delete or manipulate a specific gene in mice. The influence of a given gene on a specific behavior can then be determined by conducting behavioral analyses of the mutant mice. As a test for behavioral phenotyping of mutant mice, the light/dark transition test is one of the most widely used tests to measure anxiety-like behavior in mice. The test is based on the natural aversion of mice to brightly illuminated areas and on their spontaneous exploratory behavior in novel environments. The test is sensitive to anxiolytic drug treatment. The apparatus consists of a dark chamber and a brightly illuminated chamber. Mice are allowed to move freely between the two chambers. The number of entries into the bright chamber and the duration of time spent there are indices of bright-space anxiety in mice. To obtain phenotyping results of a strain of mutant mice that can be readily reproduced and compared with those of other mutants, the behavioral test methods should be as identical as possible between laboratories. The procedural differences that exist between laboratories, however, make it difficult to replicate or compare the results among laboratories. Here, we present our protocol for the light/dark transition test as a movie so that the details of the protocol can be demonstrated. In our laboratory, we have assessed more than 60 strains of mutant mice using the protocol shown in the movie. Those data will be disclosed as a part of a public database that we are now constructing.

Visualization of the protocol will facilitate understanding of the details of the entire experimental procedure, allowing for standardization of the protocols used across laboratories and comparisons of the behavioral phenotypes of various strains of mutant mice assessed using this test.

The light/dark transition test is one of the most widely used tests to measure anxiety-like behavior in mice. Here, we present a movie that shows detailed procedures on how we conduct the test.

אור / חושך מעבר מבחן עכברים

Although all of the mouse genome sequences have been determined, we do not yet know the functions of most of these genes. Gene-targeting techniques, ...

Organotypic Culture of Adult Rabbit Retina

Organotypic culture systems of functional neural tissues are important tools in neurobiological research. Ideally, such a system should be compatible with imaging techniques, genetic manipulation, and electrophysiological recording. Here we present a simple interphase tissue culture system for adult rabbit retina that requires no specialized equipment and very little maintenance. We demonstrate the dissection and incubation of rabbit retina and particle-mediated gene transfer of plasmids encoding GFP or a variety of subcellular markers into retinal ganglion cells. Rabbit retinas cultured this way can be kept alive for up to 6 days with very little changes of the overall anatomical structure or the morphology of individual ganglion- and amacrine cells.

This article demonstrates the dissection and incubation of rabbit retina and particle-mediated gene transfer of plasmids encoding GFP or a variety of subcellular markers into retinal ganglion cells.

תרבות Organotypic של הרשתית הארנב למבוגרים

Organotypic culture systems of functional neural tissues are important tools in neurobiological research. Ideally, such a system should be compatible with ...

Thin Sectioning of Slice Preparations for Immunohistochemistry

Many investigations in neuroscience, as well as other disciplines, involve studying small, yet macroscopic pieces or sections of tissue that have been preserved, freshly removed, or excised but kept viable, as in slice preparations of brain tissue.  Subsequent microscopic studies of this material can be challenging, as the tissue samples may be difficult to handle.  Demonstrated here is a method for obtaining thin cryostat sections of tissue with a thickness that may range from 0.2-5.0 mm.  We routinely cut 400 micron thick Vibratome brain slices serially into 5-10 micron coronal cryostat sections.  The slices are typically first used for electrophysiology experiments and then require microscopic analysis of the cytoarchitecture of the region from which the recordings were observed.  We have constructed a simple device that allows controlled and reproducible preparation and positioning of the tissue slice.  This device consists of a cylinder 5 cm in length with a diameter of 1.2 cm, which serves as a freezing stage for the slice.  A ring snugly slides over the cylinder providing walls around the slice allowing the tissue to be immersed in freezing compound (e.g., OCT).  This is then quickly frozen with crushed dry ice and the resulting  wafer  can be position easily for cryostat sectioning.  Thin sections can be thaw-mounted onto coated slides to allow further studies to be performed, such as various staining methods, in situ hybridization, or immunohistochemistry, as demonstrated here.

The present method allows reproducible cryostat sectioning of small, difficult-to-manage, tissue pieces, such as biopsies and brain slices. We utilize a simple aluminum freezing stage to facilitate handling of tissue and a standard cryostat to routinely produce 5-10 micron serial sections from 400 micron thick brain slices.

חתך דק של ההכנות פורסים עבור אימונוהיסטוכימיה

Many investigations in neuroscience, as well as other disciplines, involve studying small, yet macroscopic pieces or sections of tissue that have been ...

Organotypic Slice Culture of E18 Rat Brains

Organotypic slice cultures from embryonic rodent brains are widely used to study brain development. While there are often advantages to an in-vivo system, organotypic slice cultures allow one to perform a number of manipulations that are not presently feasible in-vivo. To date, organtotypic embryonic brain slice cultures have been used to follow individual cells using time-lapse microscopy, manipulate the expression of genes in the ganglionic emanances (a region that is hard to target by in-utero electroporation), as well as for pharmacological studies. In this video protocol we demonstrate how to make organotypic slice cultures from rat embryonic day 18 embryos. The protocol involves dissecting the embryos, embedding them on ice in low melt agarose, slicing the embedded brains on the vibratome, and finally plating the slices onto filters in culture dishes. This protocol is also applicable in its present form to making organotypic slice cultures from different embryonic ages for both rats and mice. 

פורסים תרבות Organotypic של E18 מוח החולדה

Organotypic slice cultures from embryonic rodent brains are widely used to study brain development. While there are often advantages to an in-vivo system, ...

Preparation of Gene Gun Bullets and Biolistic Transfection of Neurons in Slice Culture

Biolistic transfection is a physical means of transfecting cells by bombarding tissue with high velocity DNA coated particles. We provide a detailed protocol for biolistic transfection of rat hippocampal slices, from the initial preparation of DNA coated bullets to the final shooting of the organotypic slice cultures using a gene gun. Gene gun transfection is an efficient and easy means of transfecting neurons and is especially useful for fluorescently labeling a small subset of cells in tissue slice. In this video, we first outline the steps required to coat gold particles with DNA. We next demonstrate how to line the inside of plastic tubing with the gold/DNA bullets, and how to cut this tubing to obtain the plastic cartridges for loading into the gene gun. Finally, we perform biolistic transfection of rat hippocampal slice cultures, demonstrating handling of the Bio-Rad Helios gene gun, and offering trouble shooting advice to obtain healthy and optimally transfected tissue slices.  

We describe a method for preparing DNA coated gold bullets and demonstrate the use of such bullets to biolistically transfect neurons in cultured hippocampal slices.

הכנת כדורי אקדח ין transfection Biolistic של נוירונים תרבות Slice

Biolistic transfection is a physical means of transfecting cells by bombarding tissue with high velocity DNA coated particles. We provide a detailed ...

Whole-cell Recordings of Light Evoked Excitatory Synaptic Currents in the Retinal Slice

We use the whole-cell patch clamp technique to study the synaptic circuitry that underlies visual information processing in the retina. In this video, we will guide you through the process of performing whole-cell recordings of light evoked currents of individual cells in the retinal slice preparation. We use the aquatic tiger salamander as an animal model. We begin by describing the dissection of the eye and show how slices are mounted for electrophysiological recordings. Once the slice is placed in the recording chamber, we demonstrate how to perform whole-cell voltage clamp recordings. We then project visual stimuli onto the photoreceptors in the slice to elicit light-evoked current responses. During the recording we perfuse the slice with pharmacological agents, whereby an 8-channel perfusion system allows us to quickly switch between different agents.  The retinal slice preparation is widely used for patch clamp recordings in the retina, in particular to study amacrine or bipolar cells, which are not accessible in a whole-mount preparation.

This video shows the process of whole-cell voltage clamp recordings in the retinal slice of the aquatic tiger salamander. We demonstrate the preparation of the slice as well as how to perform patch clamp recordings during visual stimulation of the retina.

שלמות התא הקלטות של אור עורר זרמים Synaptic מעוררים פורסים את רשתית

We use the whole-cell patch clamp technique to study the synaptic circuitry that underlies visual information processing in the retina. In this video, we ...

Evisceration of Mouse Vitreous and Retina for Proteomic Analyses

While the mouse retina has emerged as an important genetic model for inherited retinal disease, the mouse vitreous remains to be explored. The vitreous is a highly aqueous extracellular matrix overlying the retina where intraocular as well as extraocular proteins accumulate during disease.1-3 Abnormal interactions between vitreous and retina underlie several diseases such as retinal detachment, proliferative diabetic retinopathy, uveitis, and proliferative vitreoretinopathy.1,4 The relative mouse vitreous volume is significantly smaller than the human vitreous (Figure 1), since the mouse lens occupies nearly 75% of its eye.5 This has made biochemical studies of mouse vitreous challenging. In this video article, we present a technique to dissect and isolate the mouse vitreous from the retina, which will allow use of transgenic mouse models to more clearly define the role of this extracellular matrix in the development of vitreoretinal diseases.

The dissection technique illustrates evisceration of the vitreous, retina, and lens from the mouse eye, separation by centrifugation, and characterization with protein assays.

הוצאת הקרביים של הזגוגיות עכבר רשתית עבור ניתוח proteomic

While the mouse retina has emerged as an important genetic model for inherited retinal disease, the mouse vitreous remains to be explored. The vitreous is ...

In vivo Electroporation of Morpholinos into the Adult Zebrafish Retina

Many devastating inherited eye diseases result in progressive and irreversible blindness because humans cannot regenerate dying or diseased retinal neurons. In contrast, the adult zebrafish retina possesses the robust ability to spontaneously regenerate any neuronal class that is lost in a variety of different retinal damage models, including retinal puncture, chemical ablation, concentrated high temperature, and intense light treatment 1-8. Our lab extensively characterized regeneration of photoreceptors following constant intense light treatment and inner retinal neurons after intravitreal ouabain injection 2, 5, 9. In all cases, resident M&uuml;ller glia re-enter the cell cycle to produce neuronal progenitors, which continue to proliferate and migrate to the proper retinal layer, where they differentiate into the deficient neurons. 
	We characterized five different stages during regeneration of the light-damaged retina that were highlighted by specific cellular responses. We identified several differentially expressed genes at each stage of retinal regeneration by mRNA microarray analysis 10. Many of these genes are also critical for ocular development. To test the role of each candidate gene/protein during retinal regeneration, we needed to develop a method to conditionally limit the expression of a candidate protein only at times during regeneration of the adult retina. 
	Morpholino oligos are widely used to study loss of function of specific proteins during the development of zebrafish, Xenopus, chick, mouse, and tumors in human xenografts 11-14. These modified oligos basepair with complementary RNA sequence to either block the splicing or translation of the target RNA. Morpholinos are stable in the cell and can eliminate or "knockdown" protein expression for three to five days 12. 
	Here, we describe a method to efficiently knockdown target protein expression in the adult zebrafish retina. This method employs lissamine-tagged antisense morpholinos that are injected into the vitreous of the adult zebrafish eye. Using electrode forceps, the morpholino is then electroporated into all the cell types of the dorsal and central retina. Lissamine provides the charge on the morpholino for electroporation and can be visualized to assess the presence of the morpholino in the retinal cells. 
	Conditional knockdown in the retina can be used to examine the role of specific proteins at different times during regeneration. Additionally, this approach can be used to study the role of specific proteins in the undamaged retina, in such processes as visual transduction and visual processing in second order neurons.

In vivo Electroporation of Morpholinos into the Adult Zebrafish Retina

A method to conditionally knockdown a target protein&#x2019;s expression in the adult zebrafish retina is described, which involves intravitreally injecting antisense morpholinos and electroporating them into the retina. The resulting protein is knocked down for several days, which allows testing the protein&#x2019;s role in the regenerating or intact retina.

ב electroporation vivo של Morpholinos לתוך הרשתית דג הזברה למבוגרים

Many devastating inherited eye diseases result in progressive and irreversible blindness because humans cannot regenerate dying or diseased retinal ...

In Ovo Electroporation in Embryonic Chick Retina

Chicken embryonic retina is an excellent tool to study retinal development in higher vertebrates. Because of large size and external development, it is comparatively very easy to manipulate the chick embryonic retina using recombinant DNA/RNA technology. Electroporation of DNA/RNA constructs into the embryonic retina have a great advantage to study gene regulation in retinal stem/progenitor cells during retinal development. Different type of assays such as reporter gene assay, gene over-expression, gene knock down (shRNA) etc. can be performed using the electroporation technique. This video demonstrates targeted retinal injection and in ovo electroporation into the embryonic chick retina at the Hamburger and Hamilton stage 22-23, which is about embryonic day 4 (E4). Here we show a rapid and convenient in ovo electroporation technique whereby a plasmid DNA that expresses green fluorescent protein (GFP) as a marker is directly delivered into the chick embryonic subretinal space and followed by electric pulses to facilitate DNA uptake by retinal stem/progenitor cells. The new method of retinal injection and electroporation at E4 allows the visualization of all retinal cell types, including the late-born neurons1, which has been difficult with the conventional method of injection and electroporation at E1.52.

In Ovo Electroporation in Embryonic Chick Retina

The overall goal of this video is to show how to perform targeted retinal injection and in ovo electroporation of DNA/RNA constructs into the chick embryonic retina at the Hamburger and Hamilton stage 22-23, which is about embryonic day 4 (E4). This technique is very useful to study gene expression, gene regulation, and morphological change in developing chick retina.

ב electroporation לג&#39;ימי ברשתית צ&#39;יק עובריים

Chicken embryonic retina is an excellent tool to study retinal development in higher vertebrates. Because of large size and external development, it is ...

The Slice Culture Method for Following Development of Tooth Germs In Explant Culture

Explant culture allows manipulation of developing organs at specific time points&#160;and is therefore an important method for the developmental biologist. For many organs it is difficult to access developing tissue to allow monitoring during ex vivo culture. The slice culture method allows access to tissue so that morphogenetic movements can be followed and specific cell populations can be targeted for manipulation or lineage tracing.
In this paper we describe a method of slice culture that has been very successful for culture of tooth germs in a range of species. The method provides excellent access to the tooth germs, which develop at a similar rate to that observed in vivo, surrounded by the other jaw tissues. This allows tissue interactions between the tooth and surrounding tissue to be monitored. Although this paper concentrates on tooth germs, the same protocol can be applied to follow development of a number of other organs, such as salivary glands, Meckel&#39;s cartilage, nasal glands, tongue, and ear.

Here we detail a method to culture tooth germs in mandible slices using a tissue chopper. This method allows unique access to the tooth during development, providing excellent opportunity for manipulation and lineage tracing, not available using more traditional culture methods.