Cortex-，Hippocampus-，Thalamus-，下丘脑 - ，横向隔核 - 纹状体专用<em>在子宫内</em>电穿孔的C57BL / 6小鼠
Summary
This protocol describes in detail how to specifically transfect different regions in the C57BL/6 central nervous system via in utero electroporation. Included in this protocol are detailed instructions for transfections of regions that develop into the cortex, hippocampus, thalamus, hypothalamus, lateral septal nucleus and striatum.
Abstract
In utero electroporation is a widely used technique for fast and efficient spatiotemporal manipulation of various genes in the rodent central nervous system. Overexpression of desired genes is just as possible as shRNA mediated loss-of-function studies. Therefore it offers a wide range of applications. The feasibility to target particular cells in a distinct area further increases the range of potential applications of this very useful method. For efficiently targeting specific regions knowledge about the subtleties, such as the embryonic stage, the voltage to apply and most importantly the position of the electrodes, is indispensable.
Here, we provide a detailed protocol that allows for specific and efficient in utero electroporation of several regions of the C57BL/6 mouse central nervous system. In particular it is shown how to transfect regions the develop into the retrosplenial cortex, the motor cortex, the somatosensory cortex, the piriform cortex, the cornu ammonis 1-3, the dentate gyrus, the striatum, the lateral septal nucleus, the thalamus and the hypothalamus. For this information about the appropriate embryonic stage, the appropriate voltage for the corresponding embryonic stage is provided. Most importantly an angle-map, which indicates the appropriate position of the positive pole, is depicted. This standardized protocol helps to facilitate efficient in utero electroporation, which might also lead to a reduced number of animals.
Introduction
自2001年第一次描述由三个独立的小组1-3 I N 子宫内的电已成为在啮齿动物中枢神经系统的分析基因表达的一种广泛使用的标准工具。相比一代基因敲除小鼠，这是，尽管不断提高技术，还有时间和金钱消耗，对在子宫内电由于其简单的呼吁。 所以 ，在子宫内的电实现了快速，高效的GAIN-和丧失功能的研究4。
转染脑区，包含带负电荷的质粒的溶液注入到心室。在电脉冲，带负电荷的DNA迁移朝向正极，因此，转染的区域可以通过改变阳极的位置简单地选择。它经常被显示，对中枢神经系统的许多区域可たrgeted 3,5-8。例如，最近的研究表明，海马，梨状皮层或纹状体9-11的特定转染。然而，关于适当的位置的信息往往只是很少标准化，并不总是容易转移到不同的小鼠品系。
某些萌芽阶段的转染是远离琐碎。当选择在子宫内的电的集式为特定的许多影响因素必须考虑。首先，以最佳转染各自胚胎阶段，知识适当的电压是必要的。高电压降低存活率，而低电压降低转染效率2,3,12。另外，电极桨的大小起着至关重要的作用，因为采用太大的效果降低特异性或可导致死亡是由于心脏节律4,12,13亲情电极桨。该应用电压的大小和电极桨的位置是要考虑的最重要的特征，但也有影响电穿孔的结果，等的DNA的溶液的施加量进一步的因素。
我们已经制定了详细的协议，它使C57BL / 6小鼠12的各个脑区的快速，高效的转染。在此要使用的协议有关的电压的详细信息，并设置在电极焊盘以增强特异性的大小。此外，关于心室信息要与用于质粒溶液的量和电极的位置的建议被供给填充的沿。在地图，这些位置的进一步可视化的详细位置信息的指示使简单的具体和有效的 retrosplenial皮层，运动皮层，躯体感觉皮层，梨状皮质，T的子宫内的电他CORNU ammonis 1-3，齿状回，纹状体，外侧隔核，丘脑和下丘脑。
Protocol
Representative Results
Discussion
This protocol describes in detail how to transfect the retrosplenial cortex, the motor cortex, the somatosensory cortex, the piriform cortex, the cornu ammonis 1-3, the dentate gyrus, the striatum, the lateral septal nucleus, the thalamus and the hypothalamus of C75BL/6 mice. With all the provided information this is the first protocol, which supplies all necessary information to easily recreate transfections of these cerebral regions in the C57BL/6 mouse. Previous publications are mostly focused only on a few specific r…
Disclosures
The authors have nothing to disclose.
Acknowledgements
Technical supported by Melanie Pfeifer and Nikolai Schmarowski (Institute for Microscopic Anatomy and Neurobiology, University Medical Center Mainz).
Materials
| EndoFree Plasmid Maxi Kit | QIAGEN | 12362 | |
| Fast Green | Roth | 0301.1 | |
| pCAGGS | Addgene | ||
| borosilicate glass capillaries (0.8-0.9 mm diameter) | Wold Precision Instrument Inc. | 1B100F-4 | |
| Isoflurane (Forene) | Abbott | PZN 4831850 | |
| Carprofen (Rimadyl) | Pfizer GmbH | approval number: 400684.00.00 | |
| eye ointment (Bepanthen Augen und Nasensalbe) | Bayer | PZN 01578681 | |
| 0.9% benzyl alcohol 0.9% saline solution | Pharmacy of the University Medical Center Mainz |
||
| gauze (ES-Kompressen) | Hartmann | 407835 | |
| sterile 5-0 Perma-Hand Silk Suture | Ethicon Johnson & Johnson | K890H | |
| ring forceps 1/ 1.5 mm | Fine Science Tools | 11101-09 | |
| ring forceps 4.8/ 6 mm | Fine Science Tools | 11106-09 | |
| ring forceps 2.2/ 3 mm | Fine Science Tools | 11103-09 | |
| Adson Forceps-Serrated Straight 12 cm | Fine Science Tools | 1106-12 | |
| IrisScissors-Delicate Straight-Sharp/Blunt 10 cm | Fine Science Tools | 14028-10 | |
| Mayo-Stille Scissors-Straight 15 cm | Fine Science Tools | 14012-15 | |
| Dumont #5 Forceps-Inox | Fine Science Tools | 11251-20 | |
| Castroviejo NeedleHolder-with Lock-Tungsten Carbide 14 cm | Fine Science Tools | 12565-14 | |
| Elektroporator CUY21 SC | Nepa Gene Co. | ||
| FST 250 Hot Bead Sterilizer | Fine Science Tools | 18000-45 | |
| Microgrinder EG-44 | Narishige | ||
| P-97 Micropette Puller | Sutter Instrument Company | P-97 | |
| Platinum electrodes 650P 0.5 mm | Nepagene | CUY650P0.5 | |
| Platinum electrodes 650P 3 mm | Nepagene | CUY650P3 | |
| Platinum electrodes 650P 5 mm | Nepagene | CUY650P5 | |
| Platinum electrodes 650P 10 mm | Nepagene | CUY650P10 | |
| Anesthesia system | Rothacher-Medical GmbH | CV-30511-3 Vapor 19.3 | |
| Heating plate | Rothacher-Medical GmbH | HP-1M | |
| Temperature Controller 220V AC | Rothacher-Medical GmbH | TCAT-2LV |
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