Microfluidic chambers using fluid walls for cell biology.

Microfluidic chambers using fluid walls for cell biology.
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DOI:
10.1073/pnas.1805449115
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发表时间:
2018-06-26
影响因子:
11.1
通讯作者:
Walsh EJ
Walsh EJ
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Soitu C;Feuerborn A;Tan AN;Walker H;Walsh PA;Castrejón-Pita AA;Cook PR;Walsh EJ

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Despite improvements in our ability to manipulate ever-smaller volumes, most workflows in cell biology still use volumes of many microliters. We describe a method for creating microfluidic arrangements containing submicroliter volumes. It exploits interfacial forces dominant at the microscale to confine liquids with fluid (not solid) walls. We demonstrate many basic manipulations required for cell culture and some widely used downstream workflows. The method eliminates many problems associated with the fabrication of conventional microfluidic devices, thereby providing a simple on-demand approach for fabrication of microfluidic devices using materials familiar to biologists. Many proofs of concept have demonstrated the potential of microfluidics in cell biology. However, the technology remains inaccessible to many biologists, as it often requires complex manufacturing facilities (such as soft lithography) and uses materials foreign to cell biology (such as polydimethylsiloxane). Here, we present a method for creating microfluidic environments by simply reshaping fluids on a substrate. For applications in cell biology, we use cell media on a virgin Petri dish overlaid with an immiscible fluorocarbon. A hydrophobic/fluorophilic stylus then reshapes the media into any pattern by creating liquid walls of fluorocarbon. Microfluidic arrangements suitable for cell culture are made in minutes using materials familiar to biologists. The versatility of the method is demonstrated by creating analogs of a common platform in cell biology, the microtiter plate. Using this vehicle, we demonstrate many manipulations required for cell culture and downstream analysis, including feeding, replating, cloning, cryopreservation, lysis plus RT-PCR, transfection plus genome editing, and fixation plus immunolabeling (when fluid walls are reconfigured during use). We also show that mammalian cells grow and respond to stimuli normally, and worm eggs develop into adults. This simple approach provides biologists with an entrée into microfluidics.
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