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Microfluidic Sorting of Cells by Viability Based on Differences in Cell Stiffness.

Abstract：

:The enrichment of viable cells is an essential step to obtain effective products for cell therapy. While procedures exist to characterize the viability of cells, most methods to exclude nonviable cells require the use of density gradient centrifugation or antibody-based cell sorting with molecular labels of cell viability. We report a label-free microfluidic technique to separate live and dead cells that exploits differences in cellular stiffness. The device uses a channel with repeated ridges that are diagonal with respect to the direction of cell flow. Stiff nonviable cells directed through the channel are compressed and translated orthogonally to the channel length, while soft live cells follow hydrodynamic flow. As a proof of concept, Jurkat cells are enriched to high purity of viable cells by a factor of 185-fold. Cell stiffness was validated as a sorting parameter as nonviable cells were substantially stiffer than live cells. To highlight the utility for hematopoietic stem cell transplantation, frozen samples of cord blood were thawed and the purity of viable nucleated cells was increased from 65% to over 94% with a recovery of 73% of the viable cells. Thus, the microfluidic stiffness sorting can simply and efficiently obtain highly pure populations of viable cells.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Islam M,Brink H,Blanche S,DiPrete C,Bongiorno T,Stone N,Liu A,Philip A,Wang G,Lam W,Alexeev A,Waller EK,Sulchek T

doi

10.1038/s41598-017-01807-z

subject

Has Abstract

pub_date

2017-05-17 00:00:00

pages

1997

issue

1

issn

2045-2322

pii

10.1038/s41598-017-01807-z

journal_volume

7

pub_type

杂志文章

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