Nature Biotechnology
23, 83 - 87 (2004)
Published online: 19 December 2004; | doi:10.1038/nbt1050
Microfluidic sorting of mammalian cells by optical force switchingMark M Wang, Eugene Tu, Daniel E Raymond, Joon Mo Yang, Haichuan Zhang, Norbert Hagen, Bob Dees, Elinore M Mercer, Anita H Forster, Ilona Kariv, Philippe J Marchand
& William F Butler
Genoptix, Inc., 3398 Carmel Mountain Road, San Diego, California 92121, USA.
Correspondence should be addressed to Philippe J Marchand pmarchand@genoptix.comMicrofluidic-based devices have allowed miniaturization and increased parallelism of many common functions in biological assays; however, development of a practical technology for microfluidic-based fluorescence-activated cell sorting has proved challenging. Although a variety of different physical on-chip switch mechanisms have been proposed1,
2,
3,
4,
5,
6, none has satisfied simultaneously the requirements of high throughput, purity, and recovery of live, unstressed mammalian cells. Here we show that optical forces can be used for the rapid (2−4 ms), active control of cell routing on a microfluidic chip. Optical switch controls reduce the complexity of the chip and simplify connectivity. Using all-optical switching, we have implemented a fluorescence-activated microfluidic cell sorter and evaluated its performance on live, stably transfected HeLa cells expressing a fused histone−green fluorescent protein. Recovered populations were verified to be both viable and unstressed by evaluation of the transcriptional expression of two genes, HSPA6 and FOS, known indicators of cellular stress.
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