1， 前OVO文化协议： <ol><li>孵育受精鸡蛋<ol class="lroman"><li>受精鸡蛋可以保存在13 ° C可高达5天前孵化没有启动发展。一个红酒柜可以保持这个温度。 </li><li>孵育鸡蛋钝端，72小时连续摇动60％的恒温恒湿培养箱在37.5 ° C。 </li></ol></li><li>准备吊床（图1a） <ol class="lroman"><li>填写¾ 9盎司塑料杯温暖的无菌水。一个普通的9安士杯有一个直径8厘米的顶部。我们发现，这个大小是最适合长时间的文化这里介绍的应用程序。 </li><li>剪下约20厘米，保鲜。贴上环杯的顶部放置一个橡皮筋周围。塑料应在水面上传播。周围带剪下多余的塑料。我们发现，保鲜到这个应用程序是最适当的，因为它可以防止蛋黄的粘连，导致在运输过程中的蛋黄分裂。 </li><li>擦拭kimwipes用70％乙醇湿（金佰利公司）的塑料。 </li></ol></li><li>取出鸡蛋从孵化器，孵化后72小时。 </li><li>消毒用70％乙醇湿kimwipes擦拭表面的蛋。 </li><li>水平打好的鸡蛋胚胎的正确定位（图1b）为1-2分钟。一个鸡蛋纸箱可用于产卵水平。 1-2分钟后，胚胎将旋转顶端。 </li><li>吊床胚胎转移到无菌层流罩。 <ol class="lroman"><li>使用锋利的边缘（如金属桶或玻璃烧杯边缘），轻轻地挖掘鸡蛋，直到有一个蛋（图1c）底部的小凹痕。记住，胚胎的位置上upperside。 </li><li>凹痕两侧竖起大拇指，除了横向拉的炮弹（图1d）。 </li><li>将蛋黄与胚胎以及白蛋白到吊床（图1E）。白蛋白会提供缓冲环境，吸收周围的蛋黄移动系统以及悠久的文化实践的胚胎提供营养，因为它引起的冲击。吊床下面的水将确保胚胎将保持与地面平行，在运输过程中，在成像作为一种热导体，如果循环水加热器使用。 </li><li>胚胎应该已经被定位在上面，如果转让是正确执行。如果不是这样，使用一个非锐化的，无菌的对象（即封闭的弧形剪刀钝尖）和定向爱抚胚胎旋转顶端的蛋黄。 </li><li>将一个直径10厘米，杯上的培养皿密封胚胎。 </li></ol></li><li>放入孵化器设置的世界杯文化在37.5 ° C。如果便携式孵化器是用来放置1-2 9盎司杯充满蒸馏水的湿度保持在〜60％（图1F）。 </li><li>如果超越胚胎第7天的培养胚胎，压碎的蛋壳碎片散落在周边的胚胎作为对骨骼发育和成熟的钙源。 </li></ol>孵化器外成像/操纵的辅助设备： 房子建一个循环水浴中保持孵化温度而成像或操纵（图3）。可以容纳杯水浴连接，通过适当的大小管水水库。一个电阻加热器加热水库的水，这是受以下水温手动。一台水泵循环水。图画代表性描绘成像轻松通过ultrasongraphy / florescent显微镜（图3）。 <img src="/files/ftp_upload/2154/2125fig1.jpg" alt="图1" /> 图1。吊床的制备及鸡胚胎转移到吊床。 <img src="/files/ftp_upload/2154/2125fig2.jpg" alt="图2" /> 图2。代表性的结果-通过前OVO栽培技术种植的不同阶段鸡胚胎的胚胎从农户17日起，通过这种技术可以种植。 <img src="/files/ftp_upload/2154/2125fig3.jpg" alt="图3" /> 图3。 前OVO文化系统结合使用，以保持在理想的开发温度胚胎的水循环系统的原理图和有代表性的图片。 2。选定的应用程序： 一，显微注射这个胚胎培养适合显微注射的应用解决方案需要注射到血管成像对比（即荧光显微镜，微型计算地形等）（图4）。下面是显微注射的协议： <ol><li>准备注射appara。TUS <ol class="lroman"><li>时尚0.75编号玻璃毛细管拉成斜面尖端microforge使用微针。需要提示的大小取决于目标静脉直径/流量所需的速率。 </li><li> 0.03英寸内径硅胶管连接注射器。 </li><li>被注入的解决方案负载油管和油管连接的微针。 </li><li>将注射器持有人或注射泵上的显微操纵器和注射器的微针。 </li></ol></li><li>添加无菌水在杯子里，从而提高胚胎。我们经验丰富的，适当的针头进入血管（即卵黄船只）的渗透，横向穿透力是必要的。这需要胚胎作为同一平面上的杯子的边缘上。 <ol class="lroman"><li>下胚胎的塑料取出橡皮筋。 </li><li>塑料一侧轻轻抬起，并添加一些无菌水的杯子。 </li><li>橡皮筋固定到塑料。 </li></ol></li><li>注入胚胎血管的解决方案。根据我们的经验，当溶液注入到卵黄船只，微针需要血管直径大小约为1 / 10 日 ，以保持高效的灌注而引起出血。 <ol class="lroman"><li>泵的解决方案，以确保没有气泡形成的微针。 </li><li>微针的尖端对齐到选定的船舶。卵黄船只，选择一个叉面积会给穿透船只的最大面积。 </li><li>对船只的推针。船只将首先收回。一旦针头穿透，开始灌注。流淌的血液的颜色应与灌注变化。如果没有看到颜色的变化是，针可能已经渗透出的船只。在这种情况下，慢慢收回的微针，同时抽水解决方案，直到看到颜色的变化是在船只。灌注完成后，收回的微针的船只。 </li></ol></li></ol><img src="/files/ftp_upload/2154/2125fig4.jpg" alt="图4" /> 图4：微量注射进入前 OVO培养的鸡胚血管荧光染料。 二。显微程序 - 结扎左心房这当然OVO文化设置理想的执行，因为它提供了完整的无障碍胚胎手术应用鸡胚。下面是一个例子技术的协议，左心房结扎（​​鲎）（图5）。该程序执行了约24小时到文化时期（HH24）： <ol><li>准备上手节〜0.5毫米直径，用10-0尼龙手术缝合。 </li><li>精细镊子，本地删除在胚胎绒毛尿囊膜，从后面抬胚胎垂直旋转等，左侧是可见的胚胎。 </li><li>用细镊子，取出左心房心包。 </li><li>对齐左心房结，并拧紧。应绑结，禁止原有的血流到左边〜75％。切结与microscissors的边缘，小心地取下和丢弃多余的缝线。 </li><li>旋转胚胎回其原始方向的（在右上方）。 </li><li>深水控制将涉及相同的步骤，但缝合只会通过并没有太大的。鲎有效的治疗（75％缢）将在24小时内手术后证实，被取消资格的胚胎将被排除在外。 </li></ol><img src="/files/ftp_upload/2154/2154fig5.jpg" alt="图5" /> 图5：一个控制和左心房结扎鸡胚箭头显示左心房，这是在结扎胚胎较小的约75％。

<ol>
	<li>Zamir, E. A., Czirok, A., Cui, C., Little, C. D., Rongish, B. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mesodermal+cell+displacements+during+avian+gastrulation+are+due+to+both+individual+cell-autonomous+and+convective+tissue+movements.">Mesodermal cell displacements during avian gastrulation are due to both individual cell-autonomous and convective tissue movements.</a> Proc Natl Acad Sci U S A. 103, 19806-19811 (1980).</li><li>Ehrman, L. A., Yutzey, K. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Lack+of+regulation+in+the+heart+forming+region+of+avian+embryos.">Lack of regulation in the heart forming region of avian embryos.</a> Dev Biol. 207, 163-175 (1999).</li><li>Clark, E. B., Hu, N., Rosenquist, G. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Effect+of+conotruncal+constriction+on+aortic-mitral+valve+continuity+in+the+stage+18,+21+and+24+chick+embryo.">Effect of conotruncal constriction on aortic-mitral valve continuity in the stage 18, 21 and 24 chick embryo.</a> Am J Cardiol. 53, 324-327 (1984).</li><li>deAlmeida, A., McQuinn, T., Sedmera, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Increased+ventricular+preload+is+compensated+by+myocyte+proliferation+in+normal+and+hypoplastic+fetal+chick+left+ventricle.">Increased ventricular preload is compensated by myocyte proliferation in normal and hypoplastic fetal chick left ventricle.</a> Circ Res. 100, 1363-1370 (2007).</li><li>Nakamura, H., Funahashi, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Introduction+of+DNA+into+chick+embryos+by+in+ovo+electroporation.">Introduction of DNA into chick embryos by in ovo electroporation.</a> Methods. 24, 43-48 (2001).</li><li>Butcher, J. T., McQuinn, T. C., Sedmera, D., Turner, D., Markwald, R. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Transitions+in+early+embryonic+atrioventricular+valvular+function+correspond+with+changes+in+cushion+biomechanics+that+are+predictable+by+tissue+composition.">Transitions in early embryonic atrioventricular valvular function correspond with changes in cushion biomechanics that are predictable by tissue composition.</a> Circ Res. 100, 1503-1511 (2007).</li><li>McQuinn, T. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=High-frequency+ultrasonographic+imaging+of+avian+cardiovascular+development.">High-frequency ultrasonographic imaging of avian cardiovascular development.</a> Dev. Dyn. 236, 3503-3513 (2007).</li><li>Korn, M. J., Cramer, K. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Windowing+chicken+eggs+for+developmental+studies.">Windowing chicken eggs for developmental studies.</a> J Vis Exp. , (2007).</li><li>Auerbach, R., Kubai, L., Knighton, D., Folkman, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+simple+procedure+for+the+long-term+cultivation+of+chicken+embryos.">A simple procedure for the long-term cultivation of chicken embryos.</a> Dev Biol. 41, 391-394 (1974).</li></ol>

光纤接入和禽流胚胎实验是具有挑战性的，由于约束的鸡蛋壳。窗口大大限制了微血管注射和显微外科方法8访问人数。因此，只有早期胚胎可以被操纵，并连续观察是不可能的。使用培养皿的早期前 OVO文化的用途有限，因为控制不力，对胚胎的表面张力，防止长期文化9。最近，我们改进了这种技术，使用一个六角形的权衡船保持可接受的表面tenstion 7，但这些文化...

<!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>Fertile white Leghorn chicken eggs</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Model GB1, Avery Incubators, Hugo CO</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Saran Wrap</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Kimwipes</td>
<td>&nbsp;</td>
<td>Kimberly-Clark, Inc.</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Rubber bands</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Warm sterile water</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>9 oz plastic cup</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>100 mm diameter Petri dish</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>1602N thermal air</td>
<td>&nbsp;</td>
<td>GQF Manufacturing CO, Savannah GA</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Fluorescein-conjugated dextran (2 MDa, 1% w/v in phosphate buffered saline)</td>
<td>&nbsp;</td>
<td>Sigma Aldrich Inc.</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Microforge</td>
<td>&nbsp;</td>
<td>Glassworx, Inc, St Louis MO</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Glass capillary tubes (0.75 mm ID)</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Micromanipulator</td>
<td>&nbsp;</td>
<td>World Precision Instruments, Sarasota FL</td>
<td>Model M3301L</td>
<td>&nbsp;</td>
<tr>
<td>Fluorescent microscopy</td>
<td>&nbsp;</td>
<td>Zeiss</td>
<td>Z20</td>
<td>&nbsp;</td>
<tr>
<td>Fine 55-forceps</td>
<td>&nbsp;</td>
<td>World Precision Instruments, Sarasota FL</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>10-0 nylon surgical suture</td>
<td>&nbsp;</td>
<td>Ethicon</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Tubing</td>
<td>&nbsp;</td>
<td>VWR</td>
<td>&nbsp;</td>
<td>1mm OD</td>
</tr>
<tr>
<td>3 mL syringe</td>
<td>&nbsp;</td>
<td>BD</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>200 &mu;L pipetter and pipette tips</td>
<td>&nbsp;</td>
<td>VWR</td>
<td>&nbsp;</td>
<td>&nbsp;</td>		</tbody>
		</table>
		</div>

an ex-ovo chicken embryo culture system suitable for imaging and microsurgery applications

了解驱动器正常和畸形的胚胎发育的遗传和微环境因素之间的关系，为发现新的治疗策略的根本。成像技术的进步已使定量调查的组织和成熟的身体计划，但后一阶段的胚胎形态发生目前还不太清楚。鸡胚胎是一个有吸引力的脊椎动物为这个应用程序的模型系统，因为它的文化和手术操作方便。早期胚胎可以培养一个短的时间在滤纸上环，从而使光纤接入完整的细胞图案和命运的研究1,2。学习先进的，如心脏的形态发生发育过程中，传统上通过一个窗口蛋壳3-5，但这种技术限制了光纤接入，由于窗口大小。我们以前开发的一个简单的方法来文化的整个胚胎前，OVO六角权衡船最多至10天，这使得通过高分辨率成像超声6,7。这些文化，运输困难，限制了可用于现场实验的成像工具的类型。我们在座改善与成本效益，便携式环境室的无壳培养体系。鸡蛋被破解到圆周部分用无菌水填充到塑料杯贴上由聚氨酯膜（保鲜）创建了一个吊床。吊床的周长和深度尺寸均保持表面张力的关键，而下的吊床和水力学有助于抑制由运输引起的震动。还开发了一个小的足迹，循环水浴，使实验过程中连续的温度控制。我们证明至少14天的能力，在这样的文化胚胎的无形态发生缺陷或延迟，并聘请几个显微和成像应用这个系统。

Watch this Scientific Journal Video about An ex-ovo Chicken Embryo Culture System Suitable for Imaging and Microsurgery Applications at JoVE.com

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

在这篇文章中，我们提出一个简单的方法，使长期<em&gt; EX - OVO</em&gt;禽流胚胎培养。这种技术是理想的纵向实验要求完整的光学辅助和/或无菌运输禽流胚胎。

一个 EX - OVO鸡胚胎培养系统适用于成像和显微外科的应用

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

an-ex-ovo-chicken-embryo-culture-system-suitable-for-imaging

Research

JoVE Journal

Biology

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

22.9K 次观看.  Cornell University. 在这篇文章中，我们提出一个简单的方法，使长期 EX - OVO禽流胚胎培养。这种技术是理想的纵向实验要求完整的光学辅助和/或无菌运输禽流胚胎。

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

Bioelectric Analyses of an Osseointegrated Intelligent Implant Design System for Amputees

The projected number of American amputees is expected to rise to 3.6 million by 2050.  Many of these individuals depend on artificial limbs to perform routine activities, but prosthetic suspensions using traditional socket technology can prove to be cumbersome and uncomfortable for a person with limb loss.  Moreover, for those with high proximal amputations, limited residual limb length may prevent exoprosthesis attachment all together. Osseointegrated implant technology is a novel operative procedure which allows firm skeletal attachment between the host bone and an implant. Preliminary results in European amputees with osseointegrated implants have shown improved clinical outcomes by allowing direct transfer of loads to the bone-implant interface.  Despite the apparent advantages of osseointegration over socket technology, the current rehabilitation procedures require long periods of restrictive load bearing prior which may be reduced with expedited skeletal attachment via electrical stimulation.  The goal of the osseointegrated intelligent implant design (OIID) system is to make the implant part of an electrical system to accelerate skeletal attachment and help prevent periprosthetic infection. To determine optimal electrode size and placement, we initiated proof of concept with computational modeling of the electric fields and current densities that arise during electrical stimulation of amputee residual limbs.  In order to provide insure patient safety, subjects with retrospective computed tomography scans were selected and three dimensional reconstructions were created using customized software programs to ensure anatomical accuracy (Seg3D and SCIRun) in an IRB and HIPAA approved study.  These software packages supported the development of patient specific models and allowed for interactive manipulation of electrode position and size. Preliminary results indicate that electric fields and current densities can be generated at the implant interface to achieve the homogenous electric field distributions   required to induce osteoblast migration, enhance skeletal fixation and may help prevent periprosthetic infections.  Based on the electrode configurations experimented with in the model, an external two band configuration will be advocated in the future.

There is a need to develop alternative prosthesis attachment due to limb loss attributed to vascular occlusive diseases and trauma. The goal of the work is to introduce an osseointegrated intelligent implant design system to increase skeletal fixation and reduce periprosthetic infection rates for patients needing osseointegrated technology.

被截肢者的智能植入种植体设计系统的生物电分析

The projected number of American amputees is expected to rise to 3.6 million by 2050.  Many of these individuals depend on artificial limbs to perform ...

科研

生物学

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

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 angiogenesis but also to study tumorigenesis. After the chick chorioallantoic membrane (CAM) has developed, its blood vessel network can be easily accessed, manipulated and observed and therefore provides an optimal setting for angiogenesis assays. Since the lymphoid system is not fully developed until late stages of incubation, the chick embryo serves as a naturally immunodeficient host capable of sustaining grafted tissues and cells without species-specific restrictions. In addition to nurturing developing allo- and xenografts, the CAM blood vessel network provides a uniquely supportive environment for tumor cell intravasation, dissemination, and vascular arrest and a repository where arrested cells extravasate to form micro metastatic foci.
For experimental purposes, in most of the recent studies the CAM was exposed by cutting a window through the egg shell and experiments were carried out in ovo, resulting in significant limitations in the accessibility of the CAM and possibilities for observation and photo documentation of effects. When shell-less cultures of the chick embryo were used1-4, no experimental details were provided and, if published at all, the survival rates of these cultures were low. We refined the method of ex ovo culture of chick embryos significantly by introducing a rationally controlled extrusion of the egg content. These ex ovo cultures enhance the accessibility of the CAM and chick embryo, enabling easy in vivo documentation of effects and facilitating experimental manipulation of the embryo. This allows the successful application to a large number of scientific questions: (1) As an improved angiogenesis assay5,6, (2) an experimental set up for facilitated injections in the vitreous of the chick embryo eye7-9, (3) as a test environment for dissemination and intravasation of dispersed tumor cells from established cell lines inoculated on the CAM10-12, (4) as an improved sustaining system for successful transplantation and culture of limb buds of chicken and mice13 as well as (5) for grafting, propagation, and re-grafting of solid primary tumor tissue obtained from biopsies on the surface of the CAM14.
In this video article we describe the establishment of a refined chick ex ovo culture and CAM assay with survival rates over 50%. Besides we provide a step by step demonstration of the successful application of the ex ovo culture for a large number of scientific applications. 
Daniel S. Dohle, Susanne D. Pasa, and Sebastian Gustmann contributed equally to this study.

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

The chick chorioallantoic membrane (CAM) is a unique, naturally immunodeficient supportive culture environment to study angiogenesis and tumorigenesis. This video article demonstrates the different steps in chick ex ovo culture, application of potentially angiogenic substances and successful inoculation of tumor cells and tissues on the surface of the CAM.

小鸡前OVO文化前OVO CAM含量：它是如何真正起作用

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 ...

Xenotransplantation of Human Stem Cells into the Chicken Embryo

The chicken embryo is a classical animal model for studying normal embryonic and fetal development and for xenotransplantation experiments to study the behavior of cells in a standardized in vivo environment. The main advantages of the chicken embryo include low cost, high accessibility, ease of surgical manipulation and lack of a fully developed immune system. Xenotransplantation into chicken embryos can provide valuable information about cell proliferation, differentiation and behavior, the responses of cells to signals in defined embryonic tissue niches, and tumorigenic potential. Transplanting cells into chicken embryos can also be a step towards transplantation experiments in other animal models. Recently the chicken embryo has been used to evaluate the neurogenic potential of human stem and progenitor cells following implantation into neural anlage1-6. In this video we document the entire procedure for transplanting human stem cells into the developing central nervous system of the chicken embryo. The procedure starts with incubation of fertilized eggs until embryos of the desired age have developed. The eggshell is then opened, and the embryo contrasted by injecting dye between the embryo and the yolk. Small lesions are made in the neural tube using microsurgery, creating a regenerative site for cell deposition that promotes subsequent integration into the host tissue. We demonstrate injections of human stem cells into such lesions made in the part of the neural tube that forms the hindbrain and the spinal cord, and into the lumen of the part of the neural tube that forms the brain. Systemic injections into extraembryonic veins and arteries are also demonstrated as an alternative way to deliver cells to vascularized tissues including the central nervous system. Finally we show how to remove the embryo from the egg after several days of further development and how to dissect the spinal cord free for subsequent physiological, histological or biochemical analyses.

In this paper we present a method for transplanting human stem cells into various regions of the central nervous system of the chicken embryo. This provides an in vivo model for assessing the proliferation and differentiation of various types of human stem cells in embryonic tissue environments.

人类干细胞异种移植到鸡胚

The chicken embryo is a classical animal model for studying normal embryonic and fetal development and for xenotransplantation experiments to study the ...

The Method of Rodent Whole Embryo Culture using the Rotator-type Bottle Culture System

Whole embryo culture (WEC) technique has been developed in 1950's by New and his colleagues, and applied for developmental biology 1. Although development and growth of mammalian embryos are critically dependent on the function of the placenta, WEC technique allows us to culture mouse and rat embryos ex vivo condition during limited periods corresponding to midgestation stages during embryonic day (E) 6.5-E12.5 in the mouse or E8.5-E14.5 in the rat 2, 3, 4. In WEC, we can directly target desired areas of embryos using fine glass capillaries because embryos can be manipulated under the microscope. Therefore, rodent WEC is very useful technique when we want to study dynamic developmental processes of postimplanted mammalian embryos. Up to date, several types of WEC systems have been developed 1. Among those, the rotator-type bottle culture system is most popular and suitable for long-term culture of embryos at midgestation, i.e., after E9.5 and E11.5 in the mouse and rat, respectively 1. In this video protocol, we demonstrate our standard procedures of rat WEC after E12.5 using a refined model of the original rotator system, which was designed by New and Cockroft 5, 6, and introduce various applications of WEC technique for studies in mammalian developmental biology.

Whole embryo culture technique allows us to culture mouse and rat embryos ex vivo condition during limited periods corresponding to midgestation stages. In this video protocol, we demonstrate our standard procedures of rat whole embryo culture after E12.5 using the rotator-type bottle culture system.

鼠类全胚胎培养方法，使用的肩型瓶培养系统

Whole embryo culture (WEC) technique has been developed in 1950's by New and his colleagues, and applied for developmental biology 1. Although development ...

Closed System Cell Culture Protocol Using HYPERStack Vessels with Gas Permeable Material Technology

Large volume adherent cell culture is currently standardized on stacked plate cell growth products when microcarrier beads are not an optimal choice. HYPERStack vessels allow closed system scale up from the current stacked plate products and delivers >2.5X more cells in the same volumetric footprint. The HYPERStack vessels function via gas permeable material which allows gas exchange to occur, therefore eliminating the need for internal headspace within a vessel. The elimination of headspace allows the compartment where cell growth occurs to be minimized to reduce space, allowing more layers of cell growth surface area within the same volumetric footprint.
For many applications such as cell therapy or vaccine production, a closed system is required for cell growth and harvesting. The HYPERStack vessel allows cell and reagent addition and removal via tubing from media bags or other methods.
This protocol will explain the technology behind the gas permeable material used in the HYPERStack vessels, gas diffusion results to meet the metabolic needs of cells, closed system cell growth protocols, and various harvesting methods.

An Introduction into the technology, protocol and handling of the Corning HYPERStack Vessels and accessories used for high yield adherent cell culture. The protocol will show how to use the closed system vessels for increasing cell harvesting over current stacked plate products.

封闭的系统使用透氧材料科技HYPERStack船只的细胞培养协议

Large volume adherent cell culture is currently standardized on stacked plate cell growth products when microcarrier beads are not an optimal choice.   ...

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.

基因转移到老年人的鸡胚<em&gt;前OVO</em&gt;电穿孔

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

Mouse Embryonic Development in a Serum-free Whole Embryo Culture System

Mid-gestation stage mouse embryos were cultured utilizing a serum-free culture medium prepared from commercially available stem cell media supplements in an oxygenated rolling bottle culture system. Mouse embryos at E10.5 were carefully isolated from the uterus with intact yolk sac and in a process involving precise surgical maneuver the embryos were gently exteriorized from the yolk sac while maintaining the vascular continuity of the embryo with the yolk sac. Compared to embryos prepared with intact yolk sac or with the yolk sac removed, these embryos exhibited superior survival rate and developmental progression when cultured under similar conditions. We show that these mouse embryos, when cultured in a defined medium in an atmosphere of 95% O2 / 5% CO2 in a rolling bottle culture apparatus at 37 &#176;&#8203;C for 16-40 hr, exhibit morphological growth and development comparable to the embryos developing in utero. We believe this method will be useful for investigators needing to utilize whole embryo culture to study signaling interactions important in embryonic organogenesis.

Serum utilized in embryo cultures contains unknown components that can affect the outcome of experiments especially in studies involving signaling interactions. Here we utilized a serum-free oxygenated culture system and show that mid-gestation mouse embryos cultured for 16-40 hr&#160;exhibit morphological development comparable to embryos developing in utero.

鼠胚体外发育无血清全胚胎培养系统

Mid-gestation stage mouse embryos were cultured utilizing a serum-free culture medium prepared from commercially available stem cell media supplements in ...

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.

一个<em&gt;体外</em&gt;企业文化系统来研究甲状腺发展

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 ...

Preparation of Rat Serum Suitable for Mammalian Whole Embryo Culture

Mammalian whole embryo culture (WEC) is a widely used technique for examining pharmacological toxicity in developing mouse and rat embryos and for investigating the mechanisms of developmental processes. Immediately centrifuged (IC) rat serum is commonly used for WEC and is essential for the growth and development of cultured mouse and rat embryos ex vivo. For the culture of midgestation embryos (i.e., E8.0-12.5 for the mouse, and E10.0-14.5 for the rat), 100% rat serum is the best media for supporting the growth of the embryo ex vivo. To prepare rat serum suitable for WEC, the collected blood should be centrifuged immediately to separate the blood cells from the plasma fraction. After centrifugation, the fibrin clot forms in the upper layer; this clot should be squeezed gently using a pair of sterile forceps and subsequently centrifuged to completely separate the blood cells from the serum. In this video article, we demonstrate our standard protocol for the preparation of optimal IC rat serum, including blood collection from the abdominal aorta of male rats and extraction of the serum by centrifugation.

Mammalian whole embryo culture (WEC) is widely used in teratology and developmental biology. Immediately centrifuged rat serum is commonly provided as a medium for both mouse and rat WEC. In this video, we demonstrate our standard protocol for the preparation of high-quality rat serum suitable for mammalian WEC.

大鼠血清适用于哺乳动物全胚胎培养的制备

Mammalian whole embryo culture (WEC) is a widely used technique for examining pharmacological toxicity in developing mouse and rat embryos and for ...

Establishment of an Extracellular Acidic pH Culture System

Conditions of the tumor microenvironment, such as hypoxia or nutrient starvation, play critical roles in cancer progression and malignancy. However, the role of acidic extracellular pH in tumor aggressiveness and its underlying mechanism has not been extensively studied compared to hypoxic or nutrient starvation conditions. In addition, a well-defined culture method to mimic the acidic extracellular tumor microenvironment has not been fully reported.
Here we present a simple in vitro culture method to maintain acidic extracellular pH using reduced bicarbonate and increased lactate or HCl concentrations in the culture medium. The medium pH was sustained for at least 24 h and gradually decreased by 72 h following culture of PANC-1 and AsPC-1 pancreatic cancer cells. Three distinct acidic media conditions in this study highly upregulated pH-responsive genes such as MSMO1, INSIG1, and IDI1 compared to hypoxia or nutrient starvation. The upregulation of these genes can be used as a marker of acidic pH. These simple techniques are beneficial to elucidate underlying mechanisms of tumor malignancy under acidic tumor microenvironment. Therefore, our extracellular acidic pH culture system enables discovery of cellular acidic pH responses not only in cancer cells but also in primary cells, such as renal tubular cells, in relation to the other acidic disorders including, diabetic ketoacidosis, lactic acidosis, renal tubular acidosis, and respiratory acidosis.

The acidic tumor microenvironment plays critical roles in tumor progression. To assess the effects of acidic extracellular pH on cancer cells in vitro, we established simple acidic culture systems.

胞外酸性 pH 培养体系的建立

Conditions of the tumor microenvironment, such as hypoxia or nutrient starvation, play critical roles in cancer progression and malignancy. However, the ...