Высокая эффективность, определенных сайтов Трансфекция прилипшие клетки с помощью миРНК Микроэлектродные массивы (MEA)
Summary
В статье подробно протокол для сайт-специфической трансфекции яичницу последовательности миРНК в приверженцем культуры млекопитающих ячейки с помощью микроэлектродов массива (МПС).
Abstract
The discovery of RNAi pathway in eukaryotes and the subsequent development of RNAi agents, such as siRNA and shRNA, have achieved a potent method for silencing specific genes1-8 for functional genomics and therapeutics. A major challenge involved in RNAi based studies is the delivery of RNAi agents to targeted cells. Traditional non-viral delivery techniques, such as bulk electroporation and chemical transfection methods often lack the necessary spatial control over delivery and afford poor transfection efficiencies9-12. Recent advances in chemical transfection methods such as cationic lipids, cationic polymers and nanoparticles have resulted in highly enhanced transfection efficiencies13. However, these techniques still fail to offer precise spatial control over delivery that can immensely benefit miniaturized high-throughput technologies, single cell studies and investigation of cell-cell interactions.
Recent technological advances in gene delivery have enabled high-throughput transfection of adherent cells14-23, a majority of which use microscale electroporation. Microscale electroporation offers precise spatio-temporal control over delivery (up to single cells) and has been shown to achieve high efficiencies19, 24-26. Additionally, electroporation based approaches do not require a prolonged period of incubation (typically 4 hours) with siRNA and DNA complexes as necessary in chemical based transfection methods and lead to direct entry of naked siRNA and DNA molecules into the cell cytoplasm. As a consequence gene expression can be achieved as early as six hours after transfection27. Our lab has previously demonstrated the use of microelectrode arrays (MEA) for site-specific transfection in adherent mammalian cell cultures17-19. In the MEA based approach, delivery of genetic payload is achieved via localized micro-scale electroporation of cells. An application of electric pulse to selected electrodes generates local electric field that leads to electroporation of cells present in the region of the stimulated electrodes. The independent control of the micro-electrodes provides spatial and temporal control over transfection and also enables multiple transfection based experiments to be performed on the same culture increasing the experimental throughput and reducing culture-to-culture variability.
Here we describe the experimental setup and the protocol for targeted transfection of adherent HeLa cells with a fluorescently tagged scrambled sequence siRNA using electroporation. The same protocol can also be used for transfection of plasmid vectors. Additionally, the protocol described here can be easily extended to a variety of mammalian cell lines with minor modifications. Commercial availability of MEAs with both pre-defined and custom electrode patterns make this technique accessible to most research labs with basic cell culture equipment.
Protocol
Discussion
В этом видео статье мы демонстрации использования МПС для конкретных участков трансфекции клеток HeLa с яичницей последовательности миРНК. Одним из преимуществ данной технологии является ее применимость к различным клеточных линий, включая первичные клеточные линии. Наша лаборатория …
Disclosures
The authors have nothing to disclose.
Materials
| Name of the reagent | Company | Catalogue number | Comments (optional) |
| Cell media: Advanced MEM L-Glutamine 200 mM Penicillin/Streptomycin Fetal bovine serum |
Gibco/Invitrogen Himedia Laboratories/VWR Lonza group Ltd. Gibco/Invitrogen |
12492-013 95057-448 09-757F 16000-044 |
Cell media composition: 2% FBS, 2%L-glutamine and 2% Pennstrep in Advance MEM |
| Trypsin EDTA | Mediatech, Inc. | 25-053-CL | |
| PBS | Mediatech, Inc. | 21-040-CV | |
| Alexa 488 and rhodamine tagged scrambled sequence siRNA | Qiagen, Inc. | 1027292 | |
| Electroporation buffer | Biorad Laboratories | 165-2677 | |
| Waveform generator | Pragmatic | 2414A | Any waveform/pulse generator that can deliver the desired pulses can be used. |
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