Exploiting osmosis for blood cell sorting |
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Authors: | Vahidreza Parichehreh Rosendo Estrada Srikanth Suresh Kumar Kranthi Kumar Bhavanam Vinay Raj Ashok Raj Palaniappan Sethu |
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Institution: | (1) Department of Bioengineering, University of Louisville, 2210 S. Brook Street, 357 SRB, Louisville, KY 40208, USA;(2) Division of Hematology/Oncology, Department of Pediatrics, School of Medicine, University of Louisville, Louisville, KY 40202, USA; |
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Abstract: | Blood is a valuable tissue containing cellular populations rich in information regarding the immediate immune and inflammatory
status of the body. Blood leukocytes or white blood cells (WBCs) provide an ideal sample to monitor systemic changes and understand
molecular signaling mechanisms in disease processes. Blood samples need to be processed to deplete contaminating erythrocytes
or red blood cells (RBCs) and sorted into different WBC sub-populations prior to analysis. This is typically accomplished
using immuno-affinity protocols which result in undesirable activation. An alternative is size based sorting which by itself
is unsuitable for WBCs sorting due to size overlap between different sub-populations. To overcome this limitation, we investigated
the possibility of using controlled osmotic exposure to deplete and/or create a differential size increase between WBC populations.
Using a new microfluidic cell docking platform, the response of RBCs and WBCs to deionized (DI) water was evaluated. Time
lapse microscopy confirms depletion of RBCs within 15 s and creation of > 3 μm size difference between lymphocytes, monocytes
and granulocytes. A flow through microfluidic device was also used to expose different WBCs to DI water for 30, 60 and 90 s
to quantify cell loss and activation. Results confirm preservation of ∼ 100% of monocytes, granulocytes and loss of ∼ 30%
of lymphocytes (mostly CD3+/CD4+) with minimal activation. These results indicate feasibility of this approach for monocyte, granulocyte and lymphocyte (sub-populations)
isolation based on size. |
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