Abstract
Cell microarrays with culture sites composed of individually removable microstructures or micropallets have proven benefits for isolation of cells from a mixed population. The laser energy required to selectively remove these micropallets with attached cells from the array depends on the microstructure surface area in contact with the substrate. Laser energies sufficient to release micropallets greater than 100 μm resulted in loss of cell viability. A new three-dimensional culture site similar in appearance to a table was designed and fabricated using a simple process that relied on a differential sensitivity of two photoresists to UV-mediated photopolymerization. With this design, the larger culture area rests on four small supports to minimize the surface area in contact with the substrate. Microtables up to 250 × 250 μm were consistently released with single 10-μJ pulses to each of the four support structures. In contrast, microstructures with a 150 × 150-μm surface area in contact with the substrate could not be reliably released at pulse energies up to 212 μJ. Cassie–Baxter wetting is required to provide a barrier of air to localize and sequester cells to the culture sites. A second asset of the design was an increased retention of this air barrier under conditions of decreased surface tension and after prolonged culture of cells. The improved air retention was due to the hydrophobic cavity created beneath the table and above the substrate which entrapped air when an aqueous solution was added to the array. The microtables proved an efficient method for isolating colonies from the array with 100% of selected colonies competent to expand following release from the array.
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Acknowledgements
This research was supported by the NIH (EB007612 and HG004843). We gratefully acknowledge the technical support for the confocal analyses provided by Dr. Michael Chua in the Hooker Microscopy Facility, University of North Carolina–Chapel Hill.
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Nancy Allbritton, M.D., Ph.D. Professor & Chair, UNC/NCSU Joint Department of Biomedical Engineering Paul Debreczeny Distinguished Professor, UNC Department of Chemistry
The Dept. of Biomedical Engineering is a joint department between North Carolina State University and the University of North Carolina.
Published in the special issue on Focus on Bioanalysis with Guest Editors Antje J. Baeumner, Günter Gauglitz, and Frieder W. Scheller.
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Pai, JH., Xu, W., Sims, C.E. et al. Microtable arrays for culture and isolation of cell colonies. Anal Bioanal Chem 398, 2595–2604 (2010). https://doi.org/10.1007/s00216-010-3984-1
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DOI: https://doi.org/10.1007/s00216-010-3984-1