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Journal of Biomedical Optics

Microfluidic approach for direct and uniform laser irradiation to study biochemical state changes on Jurkat-T cells
Author(s): Sween J. Butler; Dong-Weon Lee; Curtis W. Burney; Jeffrey C. Wigle; Tae-Youl Choi
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Paper Abstract

We investigated the potential for using polydimethylsiloxane microfluidic devices in a biological assay to explore the cellular stress response (CSR) associated with hyperthermia induced by exposure to laser radiation. In vitro studies of laser-tissue interaction traditionally involved exposing a monolayer of cells. Given the heating-cooling dynamics of the cells and nutrient medium, this technique produces a characteristic “bulls-eye” temperature history that plagues downstream molecular analyses due to the nonuniform thermal experience of exposed cells. To circumvent this issue, we devised an approach to deliver single cells to the laser beam using a microfluidic channel, allowing homogeneous irradiation and collection of sufficient like-treated cells to measure changes in CSR after laser heating. To test this approach, we irradiated Jurkat-T cells with a 2-μm-wavelength laser in one branch of a 100-μm-wide bifurcated channel while unexposed control cells were simultaneously passing through the other, identical channel. Cell viability was measured using vital dyes, and expression of HSPA1A was measured using reverse transcription polymerase chain reaction. The laser damage threshold was 25±2  J/cm 2 , and we found a twofold increase in expression at that exposure. This approach may be employed to examine transcriptome-wide/proteome changes and further comparative work across stressors and cell types.

Paper Details

Date Published: 6 November 2013
PDF: 6 pages
J. Biomed. Opt. 18(11) 117004 doi: 10.1117/1.JBO.18.11.117004
Published in: Journal of Biomedical Optics Volume 18, Issue 11
Show Author Affiliations
Sween J. Butler, Univ. of North Texas (United States)
Dong-Weon Lee, Chonnam National Univ. (Korea, Republic of)
Curtis W. Burney, U.S. Air Force Academy (United States)
Jeffrey C. Wigle, U.S. Air Force (United States)
Tae-Youl Choi, Univ. of North Texas (United States)

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