Abstract:
Aim:Few haematopoietic stem cells (HSCs) injected systemically for therapeutic purposes actually reach sites of injury as the vast majority become entrapped within pulmonary capillaries. One promising approach to maintain circulating HSC numbers would be to separate subpopulations with smaller size and/or greater deformability from a heterogeneous population. This study tested whether this could be achieved using label-free microfluidic devices. Methods:2 straight (A-B) and 3 spiral (C-E) devices were fabricated with different dimensions. Cell sorting was performed at different flow rates after which cell diameter and stiffness were determined using micromanipulation. Cells isolated using the most efficient device were tested intravitally for their ability to home to the mouse injured gut. Results:Only straight Device B at a high flow rate separated HSCs with different mechanical properties. Side outlets collected mostly deformable cells (nominal rupture stress/σR = 6.81 kPa; coefficient of variation/CV = 0.31) at a throughput of 2.3 × 105 cells/min. All spiral devices at high flow rates separated HSCs with different stiffness and size. Inner outlets collected mostly deformable cells in Devices C (σR = 25.06 kPa; CV = 0.26), D (σR = 22.21 kPa; CV = 0.41), and E (σR = 29.26 kPa; CV = 0.27) at throughputs of 2.3 × 105 cells/min, 1.5 × 105 cells/min, and 1.6 × 105 cells/min, respectively. Since Device C separated cells with higher efficiency and throughput, it was utilized to test the homing ability of separated cells in vivo. Significantly more deformable cells were observed trafficking through the injured gut-interestingly, increased retention was not observed. Conclusion:This study applied microfluidics to separate subpopulations from one stem cell type based on their intrinsic mechanical heterogeneity. Fluid dynamics within curved devices most effectively separated HSCs. Such devices may benefit cellular therapy.
journal_name
Stem Cells Intjournal_title
Stem cells internationalauthors
Du M,Kavanagh D,Zhang Z,Kalia Ndoi
10.1155/2019/8540706subject
Has Abstractpub_date
2019-09-05 00:00:00pages
8540706eissn
1687-966Xissn
1687-9678journal_volume
2019pub_type
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journal_title:Stem cells international
pub_type: 杂志文章
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journal_title:Stem cells international
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pub_type: 杂志文章
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journal_title:Stem cells international
pub_type: 杂志文章,评审
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pub_type: 杂志文章,评审
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journal_title:Stem cells international
pub_type: 杂志文章
doi:10.1155/2016/8364382
更新日期:2016-01-01 00:00:00
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journal_title:Stem cells international
pub_type: 杂志文章
doi:10.1155/2019/5968236
更新日期:2019-01-22 00:00:00
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pub_type: 杂志文章,评审
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journal_title:Stem cells international
pub_type: 杂志文章
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journal_title:Stem cells international
pub_type: 杂志文章
doi:10.1155/2017/1960965
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journal_title:Stem cells international
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