Name: chick ex ovo culture and ex ovo cam assay: how it really works
Uploaded: 2009-11-30T14:45:00
Description: Watch this Scientific Journal Video about Chick ex ovo Culture and ex ovo CAM Assay: How it Really Works at JoVE.com

فإن الكتاب أود أن أشكر J. J. Kueper وWittschier للحصول على مساعدة فنية ممتازة وRuebben البروفيسور لتوريد المواد بسخاء الورم.

جميع المعدات والكواشف يتعين شراؤها معقمة أو يحتاج إلى الحرارة أو البخار أو تعقيمها تعقيم مع ETOH 70 ٪. الدولة من الكتاب والتي أجريت على حيوانات التجارب وفقا للمجتمعات الأوروبية توجيه المجلس (86/609/EEC) ، في أعقاب المبادئ التوجيهية لمعا?...

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H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Penetration+of+horseradish+peroxidase+into+the+optic+nerve+after+vitreal+or+vascular+injections+in+the+developing+chick.">Penetration of horseradish peroxidase into the optic nerve after vitreal or vascular injections in the developing chick.</a> Invest Ophthalmol. Vis. Sci. 20, 705-716 (1981).</li><li>Halfter, W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Change+in+embryonic+eye+size+and+retinal+cell+proliferation+following+intravitreal+injection+of+glycosaminoglycans.">Change in embryonic eye size and retinal cell proliferation following intravitreal injection of glycosaminoglycans.</a> Invest. Ophthalmol. Vis. Sci. 49, 3289-3298 (2008).</li><li>Oppitz, M., Busch, C., Shriek, G., Metzger, M., Just, L., Drews, U. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Non-malignant+migration+of+B16+mouse+melanoma+cells+in+the+neural+crest+and+invasive+growth+in+the+eye+cup+of+the+chick+embryo.">Non-malignant migration of B16 mouse melanoma cells in the neural crest and invasive growth in the eye cup of the chick embryo.</a> Melanoma Res. 17, 17-30 (2007).</li><li>Uchibayashi, T., Egawa, M., Nakajima, K., Hisazumi, H., Tanaka, M., Endo, Y., Sasaki, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Responses+of+tumour+cell+lines+implanted+onto+the+chorioallantoic+membrane+of+chick+embryo+to+anticancer+agents+in+combination+with+hyperthermia.">Responses of tumour cell lines implanted onto the chorioallantoic membrane of chick embryo to anticancer agents in combination with hyperthermia.</a> Urol. Res. 20, 237-239 (1992).</li><li>Demir, R., Naschberger, L., Demir, I., Melling, N., Dimmler, A., Papadopoulus, T., Sturzl, M., Klein, P., Hohenberger, W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Hypoxia+generates+a+more+invasive+phenotype+of+tumour+cells:+an+in+vivo+experimental+setup+based+on+the+chorioallantoic+membrane.">Hypoxia generates a more invasive phenotype of tumour cells: an in vivo experimental setup based on the chorioallantoic membrane.</a> Pathol. Oncol. Res. , (2008).</li><li>Kunzi-Rapp, K., Genze, F., Kufer, R., Reich, E., Hautmann, R. E., Gschwend, J. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Chorioallantoic+membrane+assay:+vascularized+3-dimensional+cell+culture+system+for+human+prostate+cancer+cells+as+an+animal+substitute+model.">Chorioallantoic membrane assay: vascularized 3-dimensional cell culture system for human prostate cancer cells as an animal substitute model.</a> J. Urol. 166, 1502-1507 (2001).</li><li>Hall, B. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Grafting+of+organs+and+tissues+to+the+chorioallantoic+membrane+of+the+embryonic+chick.">Grafting of organs and tissues to the chorioallantoic membrane of the embryonic chick.</a> TCA Manual. 4 (3), 881-883 (1978).</li><li>Kunzi-Rapp, K., Kaskel, P., Steiner, R., Peter, R. U., Krahn, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Increased+blood+levels+of+human+S100+in+melanoma+chick+embryo+xenografts'+circulation.">Increased blood levels of human S100 in melanoma chick embryo xenografts' circulation.</a> Pigment Cell Res. 14, 9-13 (2001).</li><li>McFall, R. C., Sery, T. W., Makadon, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Characterization+of+a+new+continuous+cell+line+derived+from+a+human+retinoblastoma.">Characterization of a new continuous cell line derived from a human retinoblastoma.</a> Cancer Research. 37, 1003-1010 (1977).</li><li>Deryugina, E. I., Zijlstra, A., Partridge, J. J., Kupriyanova, T. A., Madsen, M. A., Papagiannakopoulos, T., Quigley, J. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Unexpected+effect+of+matrix+metalloproteinase+down-regulation+on+vascular+intravasation+and+metastasis+of+human+fibrosarcoma+cells+selected+in+vivo+for+high+rates+of+dissemination.">Unexpected effect of matrix metalloproteinase down-regulation on vascular intravasation and metastasis of human fibrosarcoma cells selected in vivo for high rates of dissemination.</a> Cancer Research. 65, 10959-10969 (2005).</li><li>Kim, J., Kovalski, K., Ossowski, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=requirement+for+specific+proteases+in+cancer+cell+intravasation+as+revealed+by+a+novel+semiquantitative+PCR-based+assay.">requirement for specific proteases in cancer cell intravasation as revealed by a novel semiquantitative PCR-based assay.</a> Cell. 94, 353-362 (1998).</li></ol>

مبتكرة أو مجرد ثقافة الفرخ بروتوكول آخر؟ مع بروتوكولات الثقافة السابق قذيفة كانت أقل من معدلات البقاء على قيد الحياة 1-4 الإجمالية للأجنة الدجاج منخفضة ، مثل كاليفورنيا. 30 ٪ 1. والمكرر بروتوكول السابقين الثقافة ...

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		<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>Fertilized Eggs</td>
<td>Animal</td>
<td>S&ouml;ries Trockels, Germany</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Mice</td>
<td>Animal</td>
<td>Charles Rivers Laboratories</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Incubator Type 3000 with rotating egg tray</td>
<td>Tools</td>
<td>Siepmann GmbH Germany</td>
<td>9503</td>
<td>Maintain at 37&deg;C with relative humidity set above 60%</td>
</tr>
<tr>
<td>Egg incubator BSS 160</td>
<td>Tools</td>
<td>Grumbach, Germany</td>
<td>8101</td>
<td>Maintain at 37-387deg;C with relative humidity set above 60%</td>
</tr>
<tr>
<td>PBS</td>
<td>Reagent</td>
<td>Sigma</td>
<td>&nbsp;</td>
<td>PBS should be cold (&gt; 4&deg;C) and sterile
</td>
</tr>
<tr>
<td>Dulbecco's modified eagle's medium</td>
<td>Reagent</td>
<td>Sigma</td>
<td>D 6429</td>
<td>DMEM culture medium</td>
</tr>
<tr>
<td>Leibovitz's L-15 Medium</td>
<td>Reagent</td>
<td>Invitrogen</td>
<td>31415-029</td>
<td>here: collection medium for tumor samples</td>
</tr>
<tr>
<td>Tumor cell -specific medium</td>
<td>Reagent</td>
<td>Sigma</td>
<td>&nbsp;</td>
<td>each research group should use the medium they culture their tumors cells in or common culture media, e.g. Leibovitz's Medium or Dulbecco's modified eagle's medium supplemented with 15% fetal bovine serum (FBS), 4mM L-glutamine and 50 &mu;M insulin</td>
</tr>
<tr>
<td>70% EtOH</td>
<td>Reagent</td>
<td>Sigma</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Magnetic stir bar, triangled 80 mm</td>
<td>Tool</td>
<td>VWR</td>
<td>442-0391</td>
<td>A triangled magnetic stir bar serves well to crack the eggs shell.</td>
</tr>
<tr>
<td>Forceps DUMONT #5 </td>
<td>Tool</td>
<td>Fine Science Tools</td>
<td>11252-30</td>
<td>bevelled very fine shanks (0.05 mm x 0.02 mm tip)</td>
</tr>
<tr>
<td>Forceps DUMONT #7</td>
<td>Tool</td>
<td>Fine Science Tools</td>
<td>11271-30</td>
<td>curved shanks (0.07 mm x 0.10 mm tip)</td>
</tr>
<tr>
<td>Spring scissors, straight, 8cm</td>
<td>Tool</td>
<td>Fine Science Tools</td>
<td>15000-00</td>
<td>fine, small straight blades</td>
</tr>
<tr>
<td>Fine Iris scissors, straight</td>
<td>Tool</td>
<td>Fine Science Tools</td>
<td>14094-11</td>
<td>Use to cut our the CAM</td>
</tr>
<tr>
<td>Standard scissors, straight, sharp/blunt</td>
<td>Tool</td>
<td>Fine Science Tools</td>
<td>14007-14</td>
<td>Use for decapitation or cervical dislocation</td>
</tr>
<tr>
<td>microliter syringe 1702 TLLX, 25 &mu;l</td>
<td>Tool</td>
<td>Hamilton</td>
<td>80222</td>
<td>Use for injection into the vitreous</td>
</tr>
<tr>
<td>Hamilton 33-G needle (15 mm)</td>
<td>Tool</td>
<td>Fine Science Tools</td>
<td>18073-15</td>
<td>Use for injection into the vitreous</td>
</tr>
<tr>
<td>Sterile scalpels</td>
<td>Tool</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>Use for dissecting tumor samples</td>
</tr>
<tr>
<td>Small drain spoon</td>
<td>Tool</td>
<td>Geuder, Germany</td>
<td>15758</td>
<td>Use to transfer of small chick embryos</td>
</tr>
<tr>
<td>Wax board with fixing pins</td>
<td>Tool</td>
<td>Self made</td>
<td>&nbsp;</td>
<td>Use to fix of animals for dissection</td>
</tr>
<tr>
<td>Petri dishes 60 x 15 mm</td>
<td>Tool</td>
<td>Greiner</td>
<td>628102</td>
<td>&nbsp;</td>
<tr>
<td>Petri dishes 92 x 16 mm</td>
<td>Tool</td>
<td>Sarstedt</td>
<td>82.1472</td>
<td>&nbsp;</td>
<tr>
<td>Sterile Petri dish 100 x 20 mm</td>
<td>Tool</td>
<td>Greiner</td>
<td>664160</td>
<td>extra deep, with spacers for ventilation</td>
</tr>
<tr>
<td>Beaker</td>
<td>Tool</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>300-600 ml</td>
</tr>
<tr>
<td>FALCON tubes</td>
<td>Tool</td>
<td>FALCON</td>
<td>&nbsp;</td>
<td>15 ml and 50 ml</td>
</tr>
<tr>
<td>Eppendorf tubes</td>
<td>Tool</td>
<td>Eppendorf</td>
<td>&nbsp;</td>
<td>1.5 ml and 2 ml</td>
</tr>
<tr>
<td>1ml pipette tips</td>
<td>Tool</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>Use to cut plastic rings for application of substances / cells</td>
</tr>
<tr>
<td>Peripheral venous catheter (PVL)</td>
<td>Tool</td>
<td>Viggo&reg;</td>
<td>&nbsp;</td>
<td>Use to cut silicon rings from the tube for application of substances / cells</td>
</tr>
<tr>
<td>Pipettes and tips</td>
<td>Tool</td>
<td>Eppendorf / Abimed</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Autoclaved folded Filters 595 1/2, 110 mm diameter</td>
<td>Tool</td>
<td>Schleicher &amp; Schuell</td>
<td>311643</td>
<td>Carrier, which caused least irritation of the CAM; used in the paper</td>
</tr>
<tr>
<td>PTFE-Pledget, non resorbing, 6,3 x 152.4 x 1.6 mm</td>
<td>Tool</td>
<td>santec-medical</td>
<td>REF 277, LOT 832/511-1</td>
<td>Carrier; caused false positive results</td>
</tr>
<tr>
<td>Hxdroxyethylcellulose Tylose H 100000</td>
<td>Reagent</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>Carrier mixed with Kollidon 17 PF; caused false positive results</td>
</tr>
<tr>
<td>Kollidon 17 PF</td>
<td>Reagent</td>
<td>BASF</td>
<td>S30200</td>
<td>mixed with Hydroxyethylcellulose; caused false positive results</td>
</tr>
<tr>
<td>Collagen Biomatrix TissuDura</td>
<td>Tool</td>
<td>Baxter Healthcare S.A.</td>
<td>REF B2246000999999</td>
<td>Carrier; caused false positive results</td>
</tr>
<tr>
<td>Round glass cover slips, 11 mm</td>
<td>Tool</td>
<td>Assistent Germany</td>
<td>1001/0011</td>
<td>Carrier; causes false positive results</td>
</tr>
<tr>
<td>Bovine Collagen Sponge</td>
<td>Tool</td>
<td>Wyeth</td>
<td>&nbsp;</td>
<td>Carrier; caused false positive results</td>
</tr>
<tr>
<td>Resodont Absorbable Collagen Membrane</td>
<td>Tool</td>
<td>Resorba Woundcare Germany</td>
<td>LOT 280303</td>
<td>Carrier; caused false positive results</td>
</tr>
<tr>
<td>Non-Woven Swabs</td>
<td>Tool</td>
<td>Fink &amp; Walter GmbH</td>
<td>REF 328132</td>
<td>Carrier; caused false positive results</td>
</tr>		</tbody>
		</table>
		</div>

chick ex ovo culture and ex ovo cam assay: how it really works

بيض الدجاج في مرحلة مبكرة ما بين تربية في المختبر والمجراة في النظم وتوفير بيئة اختبار الأوعية الدموية ، ليس فقط لدراسة الأوعية الدموية ولكن أيضا لدراسة تكون الأورام. بعد غشاء مشيمائي الفرخ (CAM) وقد وضعت ، ويمكن شبكتها الاوعية الدموية يمكن الوصول إليها بسهولة ، والتلاعب بها ومراعاتها ، وبالتالي يوفر بيئة مثالية لفحوصات الأوعية الدموية. لأن النظام لا اللمفاوية تطويره بالكامل حتى مراحل متأخرة من الحضانة ، الجنين الفرخ بمثابة المضيف العوز المناعي بشكل طبيعي قادر على الحفاظ على الأنسجة والخلايا المطعمة أنواع محددة من دون قيود. بالإضافة إلى رعاية وتطوير ألو xenografts ، والأوعية الدموية CAM الشبكة يوفر بيئة داعمة لفريد intravasation الخلية السرطانية ، والنشر ، واعتقال الأوعية الدموية والخلايا مستودع حيث اعتقل يتسرب إلى النموذج الصغير المتنقل البؤر. لأغراض تجريبية ، في معظم الدراسات التي تعرضت لها مؤخرا بقطع CAM نافذة من خلال قشرة البيضة وأجريت التجارب في البيضة ، مما أدى إلى فرض قيود كبيرة في الوصول للCAM وإمكانيات المراقبة وثائق صورة من الآثار. كانت معدلات البقاء على قيد الحياة من هذه الثقافات وعندما استخدمت قذيفة أقل ثقافات الجنين الفرخ 1-4 ، تقدم أية تفاصيل التجريبية ، وإذا نشرت على الإطلاق ، منخفضة. نحن المكرر طريقة البيضة الثقافة السابقين لافراخ الدجاج بشكل ملحوظ من خلال طرح عقلاني من قذف للرقابة على محتوى البيضة. هذه الثقافات السابقين البيضة تعزيز إمكانية الوصول إلى الجنين CAM وفرخ ، مما سهل في الوثائق المجراة من الآثار وتسهيل التلاعب التجريبية للجنين. يسمح هذا التطبيق الناجح لعدد كبير من المسائل العلمية : (1) باعتبارها مقايسة تحسين الأوعية الدموية 5،6 ، (2) والتجريبية التي أنشئت من أجل تسهيل الحقن في الجسم الزجاجي للعين الفرخ الجنين 7-9 ، (3) كما فرقت بيئة اختبار للنشر وintravasation الخلايا السرطانية من خطوط الخلايا أنشئت على تلقيح CAM 10-12 ، (4) وتحسين نظام دعم لعملية زرع ناجحة وثقافة براعم الأطراف من الدجاج والفئران وكذلك 13 (5 ) للترقيع ، ونشر ، وإعادة ترقيع الصلبة نسيج الورم الرئيسي الحصول عليها من الخزعات على سطح CAM 14. في هذه المقالة الفيديو وصفنا في إرساء ثقافة الفرخ السابقين المكرر البيضة وCAM مقايسة مع معدلات البقاء على قيد الحياة أكثر من 50 ٪. إلى جانب نقدم خطوة خطوة من خلال مظاهرة للتطبيق الناجح للثقافة البيضة السابقين لعدد كبير من التطبيقات العلمية. ساهم دانيال س بحسب دوليه ، سوزان دال باشا ، وسيباستيان Gustmann بالتساوي على هذه الدراسة.

Watch this Scientific Journal Video about Chick ex ovo Culture and ex ovo CAM Assay: How it Really Works at JoVE.com

Chick ex ovo Culture and ex ovo CAM Assay: How it Really Works

وفرخ مشيمائي غشاء (CAM) هي فريدة من نوعها ، العوز المناعي طبيعيا بيئة ثقافة داعمة لدراسة الأوعية الدموية وتكون الأورام. هذه المقالة الفيديو يوضح الخطوات المختلفة في الفرخ<em&gt; البيضة السابقين</em&gt; الثقافة ، وتطبيق مواد يحتمل أن تكون وعائية التلقيح الناجح للخلايا وأنسجة الورم على سطح CAM.

كتكوت البيضة السابقين الثقافة و البيضة السابقين CAM الفحص : كيف يعمل حقا

Chicken eggs in the early phase of breeding are between in vitro and in vivo systems and provide a vascular test environment not only to study ...

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Biology

Chick ex ovo Culture and ex ovo CAM Assay: How it Really Works

In Ovo Electroporations of HH Stage 10 Chicken Embryos

Large size and external development of the chicken embryo have long made it a valuable tool in the study of developmental biology.  With the advent of molecular biological techniques, the chick has become a useful system in which to study gene regulation and function.  By electroporating DNA or RNA constructs into the developing chicken embryo, genes can be expressed or knocked down in order to analyze in vivo gene function.  Similarly, reporter constructs can be used for fate mapping or to examine putative gene regulatory elements.  Compared to similar experiments in mouse, chick electroporation has the advantages of being quick, easy and inexpensive.  This video demonstrates first how to make a window in the eggshell to manipulate the embryo.  Next, the embryo is visualized with a dilute solution of India ink injected below the embryo.  A glass needle and pipette are used to inject DNA and Fast Green dye into the developing neural tube, then platinum electrodes are placed parallel to the embryo and short electrical pulses are administered with a pulse generator.  Finally, the egg is sealed with tape and placed back into an incubator for further development.  Additionally, the video shows proper egg storage and handling and discusses possible causes of embryo loss following electroporation.

Chick in ovo electroporation is a technique which allows genetic manipulation of the avian embryo. Common applications of this technique include functional analysis of genes and putative enhancer elements. This video demonstrates neural tube electroporation in HH 10 chick embryos. Injection technique and proper egg handling are discussed.

Electroporations OVO في مرحلة الجنين سمو الدجاج 10

Large size and external development of the chicken embryo have long made it a valuable tool in the study of developmental biology.  With the advent of ...

Method for Culture of Early Chick Embryos ex vivo (New Culture)

The chick embryo is a valuable tool in the study of early embryonic development. Its transparency, accessibility and ease of manipulation, make it an ideal tool for studying  the formation and patterning of brain, neural tube, somite and heart primordia. Applications of chick embryo culture include electroporation of DNA or RNA constructs in order to analyze gene function, grafts of growth factor coated beads such as FGFs and BMPs , as well as whole mount in situ hybridization and immunohistochemistry. This video demonstrates the different steps in chick embryo culture; First, the embryo is explanted in saline. Then, the embryo is centered on a glass ring. The membranes surrounding the embryo are lifted along the walls of the ring. The ring is then placed in a culture dish containing a pool of albumine. The culture dish is sealed and placed in a humid chamber, where the embryo is cultured for up to 24 hrs. Finally, the embryo is removed from the ring, fixed and processed for further applications. A troubleshooting guide is also presented.

Method for Culture of Early Chick Embryos ex vivo New Culture

This video demonstrates New culture, a method by which chick embryos are cultured outside the egg for up to 24 hr. This method enables one to study early development (primitive streak to 14 som.), a period corresponding to E7-9 in mouse. Applications of this technique include electroporation, in situ hybridization and immunohistochemistry.

طريقة لثقافة الفرخ المبكر فيفو السابقين الأجنة (الثقافة الجديدة)

The chick embryo is a valuable tool in the study of early embryonic development. Its transparency, accessibility and ease of manipulation, make it an ...

Deciphering Axonal Pathways of Genetically Defined Groups of Neurons in the Chick Neural Tube Utilizing in ovo Electroporation

Employment of enhancer elements to drive expression of reporter genes in neurons is a widely used paradigm for tracking axonal projection. For tracking axonal projection of spinal interneurons in vertebrates, germ line-targeted reporter genes yield bilaterally symmetric labeling. Therefore, it is hard to distinguish between the ipsi- and contra-laterally projecting axons. Unilateral electroporation into the chick neural tube provides a useful means to restrict expression of a reporter gene to one side of the central nervous system, and to follow axonal projection on both sides 1 ,2-5. This video demonstrates first how to handle the eggs prior to injection. At HH stage 18-20, DNA is injected into the sacral level of the neural tube, then tungsten electrodes are placed parallel to the embryo and short electrical pulses are administered with a pulse generator. The egg is sealed with tape and placed back into an incubator for further development. Three days later (E6) the spinal cord is removed as an open book preparation from embryo, fixed, and processed for whole mount antibody staining. The stained spinal cord is mounted on slide and visualized using confocal microscopy.

Deciphering Axonal Pathways of Genetically Defined Groups of Neurons in the Chick Neural Tube Utilizing in ovo Electroporation

This video demonstrates how to visualize axonal pathways of genetically defined groups of neurons in the embryonic chick spinal cord utilizing in ovo electroporation of reporter genes under the control of specific enhancer elements.

فك رموز محواري مقررات تمهيدية للمجموعات المحددة وراثيا من الخلايا العصبية في الأنبوبة العصبية الاستفادة الفرخ في البيضة Electroporation

Employment of enhancer elements to drive expression of reporter genes in neurons is a widely used paradigm for tracking axonal projection. For tracking ...

An ex-ovo Chicken Embryo Culture System Suitable for Imaging and Microsurgery Applications

Understanding the relationships between genetic and microenvironmental factors that drive normal and malformed embryonic development is fundamental for discovering new therapeutic strategies. Advancements in imaging technology have enabled quantitative investigation of the organization and maturing of the body plan, but later stage embryonic morphogenesis is less clear. Chicken embryos are an attractive vertebrate animal model system for this application because of its ease of culture and surgical manipulation. Early embryos can be cultured for a short time on filter paper rings, which enables complete optical access for cell patterning and fate studies1,2. Studying advanced developmental processes such as cardiac morphogenesis are traditionally performed through a window of the eggshell3-5, but this technique limits optical access due to window size. We previously developed a simple method to culture whole embryos ex-ovo on hexagonal weigh boats for up to 10 days, which enabled high resolution imaging via ultrasonography6,7. These cultures were difficult to transport, limiting the types of imaging tools available for live experiments. We here present an improved shell-less culture system with a cost-effective, portable environmental chamber. Eggs were cracked onto a hammock created by a polyurethane membrane (cling wrap) affixed circumferentially to a plastic cup partially filled with sterile water. The dimensions of the circumference and depth of the hammock were both critical to maintain surface tension, while the mechanics of the hammock and water beneath helped dampen vibrations induced by transportation. A small footprint circulating water bath was also developed to enable continuous temperature control during experimentation. We demonstrate the ability to culture embryos in this way for at least 14 days without morphogenic defect or delay and employ this system in several microsurgical and imaging applications.

An ex-ovo Chicken Embryo Culture System Suitable for Imaging and Microsurgery Applications

In this article, we present a simple methodology to enable long-term ex-ovo avian embryo culture. This technique is ideal for longitudinal experimentation requiring complete optical accessibility and/or sterile transportation in avian embryos.

و السابقين البيضة الثقافة الأجنة النظام الدجاج مناسبة للتطبيقات التصوير والجراحة المجهرية

Understanding the relationships between genetic and microenvironmental factors that drive normal and malformed embryonic development is fundamental for ...

Ex Vivo Culture of Primary Human Fallopian Tube Epithelial Cells

Epithelial ovarian cancer is a leading cause of female cancer mortality in the United States. In contrast to other women-specific cancers, like breast and uterine carcinomas, where death rates have fallen in recent years, ovarian cancer cure rates have remained relatively unchanged over the past two decades 1. This is largely due to the lack of appropriate screening tools for detection of early stage disease where surgery and chemotherapy are most effective 2, 3. As a result, most patients present with advanced stage disease and diffuse abdominal involvement. This is further complicated by the fact that ovarian cancer is a heterogeneous disease with multiple histologic subtypes 4, 5. Serous ovarian carcinoma (SOC) is the most common and aggressive subtype and the form most often associated with mutations in the BRCA genes. Current experimental models in this field involve the use of cancer cell lines and mouse models to better understand the initiating genetic events and pathogenesis of disease 6, 7. Recently, the fallopian tube has emerged as a novel site for the origin of SOC, with the fallopian tube (FT) secretory epithelial cell (FTSEC) as the proposed cell of origin 8, 9. There are currently no cell lines or culture systems available to study the FT epithelium or the FTSEC. Here we describe a novel ex vivo culture system where primary human FT epithelial cells are cultured in a manner that preserves their architecture, polarity, immunophenotype, and response to physiologic and genotoxic stressors. This ex vivo model provides a useful tool for the study of SOC, allowing a better understanding of how tumors can arise from this tissue, and the mechanisms involved in tumor initiation and progression.

Ex Vivo Culture of Primary Human Fallopian Tube Epithelial Cells

The fallopian tube (FT) is emerging as an alternative site of origin for serous ovarian carcinoma (SOC). This protocol describes a novel method for the isolation and ex vivo culture of fallopian tube epithelial cells. This system recapitulates the in vivo epithelium and allows the study of SOC pathogenesis.

الثقافة السابقين فيفو من خلايا الإنسان الأولية قناة فالوب طلائي

Epithelial ovarian cancer is a leading cause of female cancer mortality in the United States. In contrast to other women-specific cancers, like breast and ...

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.

في Electroporation OVO في شبكية العين الفرخ الجنينية

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

Gene Transfer into Older Chicken Embryos by ex ovo Electroporation

The chicken embryo provides an excellent model system for studying gene function and regulation during embryonic development. In ovo electroporation is a powerful method to over-express exogenous genes or down-regulate endogenous genes in vivo in chicken embryos1. Different structures such as DNA plasmids encoding genes2-4, small interfering RNA (siRNA) plasmids5, small synthetic RNA oligos6, and morpholino antisense oligonucleotides7 can be easily transfected into chicken embryos by electroporation. However, the application of in ovo electroporation is limited to embryos at early incubation stages (younger than stage HH20 - according to Hamburg and Hamilton)8 and there are some disadvantages for its application in embryos at later stages (older than stage HH22 - approximately 3.5 days of development). For example, the vitelline membrane at later stages is usually stuck to the shall membrane and opening a window in the shell causes rupture of the vessels, resulting in death of the embryos; older embryos are covered by vitelline and allantoic vessels, where it is difficult to access and manipulate the embryos; older embryos move vigorously and is difficult to control the orientation through a relatively small window in the shell.
In this protocol we demonstrate an ex ovo electroporation method for gene transfer into chicken embryos at late stages (older than stage HH22). For ex ovo electroporation, embryos are cultured in Petri dishes9 and the vitelline and allantoic vessels are widely spread. Under these conditions, the older chicken embryos are easily accessed and manipulated. Therefore, this method overcomes the disadvantages of in ovo electroporation applied to the older chicken embryos. Using this method, plasmids can be easily transfected into different parts of the older chicken embryos10-12.

Gene Transfer into Older Chicken Embryos by ex ovo Electroporation

A method of gene transfer into chicken embryos at later incubation stages (older than Hamburger and Hamilton stage (HH) 22) is described. This method overcomes disadvantages of in ovo electroporation applied to older chicken embryos and is a useful technique to study gene function and regulation at older developmental stages.

نقل الجينات في أجنة الدجاج أقدم من قبل<em&gt; OVO السابقين</em&gt; Electroporation

The chicken embryo provides an  excellent model system for studying gene function and regulation during  embryonic development. In ovo electroporation is ...

A Novel Ex vivo Culture Method for the Embryonic Mouse Heart

Developmental studies in the mouse are hampered by the inaccessibility of the embryo during gestation. Thus, protocols to isolate and culture individual organs of interest are essential to provide a method of both visualizing changes in development and allowing novel treatment strategies. To promote the long-term culture of the embryonic heart at late stages of gestation, we developed a protocol in which the excised heart is cultured in a semi-solid, dilute Matrigel. This substrate provides enough support to maintain the three-dimensional structure but is flexible enough to allow continued contraction. In brief, hearts are excised from the embryo and placed in a mixture of cold Matrigel diluted 1:1 with growth medium. After the diluted Matrigel solidifies, growth medium is added to the culture dish. Hearts excised as late as embryonic day 16.5 were viable for four days post-dissection. Analysis of the coronary plexus shows that this method does not disrupt coronary vascular development. Thus, we present a novel method for long-term culture of embryonic hearts.

A Novel Ex vivo Culture Method for the Embryonic Mouse Heart

Developmental studies in the mouse are hampered by the inaccessibility of the embryo during gestation. To promote the long-term culture of the embryonic heart at late stages of gestation, we developed a protocol in which the excised heart is cultured in a semi-solid, dilute Matrigel.

رواية<em&gt; خارج الحي</em&gt; الطريقة الثقافة لالجنينية القلب

Developmental studies in the mouse are hampered  by the inaccessibility of the embryo during gestation. Thus, protocols to  isolate and culture individual ...

Ex vivo Culture of Mouse Embryonic Skin and Live-imaging of Melanoblast Migration

Melanoblasts are the neural crest derived precursors of melanocytes; the cells responsible for producing the pigment in skin and hair. Melanoblasts migrate through the epidermis of the embryo where they subsequently colonize the developing hair follicles1,2. Neural crest cell migration is extensively studied in vitro but in vivo methods are still not well developed, especially in mammalian systems. One alternative is to use ex vivo organotypic culture3-6. Culture of mouse embryonic skin requires the maintenance of an air-liquid interface (ALI) across the surface of the tissue3,6. High resolution live-imaging of mouse embryonic skin has been hampered by the lack of a good method that not only maintains this ALI but also allows the culture to be inverted and therefore compatible with short working distance objective lenses and most confocal microscopes. This article describes recent improvements to a method that uses a gas permeable membrane to overcome these problems and allow high-resolution confocal imaging of embryonic skin in ex vivo culture6. By using a melanoblast specific Cre-recombinase expressing mouse line combined with the R26YFPR reporter line we are able to fluorescently label the melanoblast population within these skin cultures. The technique allows live-imaging of melanoblasts and observation of their behavior and interactions with the tissue in which they develop. Representative results are included to demonstrate the capability to live-image 6&#160;cultures in parallel.

Ex vivo Culture of Mouse Embryonic Skin and Live-imaging of Melanoblast Migration

We describe the dissection and ex vivo culture of mouse embryonic skin. The culture system maintains an air-liquid interface across the tissue surface and allows imaging on an inverted microscope. Melanoblasts, a component of the developing skin, are fluorescently labeled allowing their behavior to be observed using confocal microscopy.

فيفو السابقين الثقافة من الفأر الجنينية بالبشرة والتصوير لايف للهجرة أرومة ميلانينية

Melanoblasts are the neural crest derived precursors of melanocytes; the cells responsible for producing the pigment in skin and hair. Melanoblasts ...

An Ex vivo Culture System to Study Thyroid Development

The thyroid is a bilobated endocrine gland localized at the base of the neck, producing the thyroid hormones T3, T4, and calcitonin. T3 and T4 are produced by differentiated thyrocytes, organized in closed spheres called follicles, while calcitonin is synthesized by C-cells, interspersed in between the follicles and a dense network of blood capillaries. Although adult thyroid architecture and functions have been extensively described and studied, the formation of the &#8220;angio-follicular&#8221; units, the distribution of C-cells in the parenchyma and the paracrine communications between epithelial and endothelial cells is far from being understood.
This method describes the sequential steps of mouse embryonic thyroid anlagen dissection and its culture on semiporous filters or on microscopy plastic slides. Within a period of four days, this culture system faithfully recapitulates in vivo thyroid development. Indeed, (i) bilobation of the organ occurs (for e12.5 explants), (ii) thyrocytes precursors organize into follicles and polarize, (iii) thyrocytes and C-cells differentiate, and (iv) endothelial cells present in the microdissected tissue proliferate, migrate into the thyroid lobes, and closely associate with the epithelial cells, as they do in vivo.
Thyroid tissues can be obtained from wild type, knockout or fluorescent transgenic embryos. Moreover, explants culture can be manipulated by addition of inhibitors, blocking antibodies, growth factors, or even cells or conditioned medium. Ex vivo development can be analyzed in real-time, or at any time of the culture by immunostaining and RT-qPCR.
In conclusion, thyroid explant culture combined with downstream whole-mount or on sections imaging and gene expression profiling provides a powerful system for manipulating and studying morphogenetic and differentiation events of thyroid organogenesis.

An Ex vivo Culture System to Study Thyroid Development

This protocol describes dissection of mouse embryonic thyroid anlagen and the culture of explants on semiporous filters or on microscopy plastic slides. This system is ideal to study morphogenetic or differentiation events occurring during thyroid development of wild type or knockout embryos, and is amenable to gain- and loss-of-function experiments.