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A microfluidic device for reversible environmental changes around single cells using optical tweezers for cell selection and positioning

Journal article
Authors Emma Eriksson
Kristin Sott
Fredrik Lundqvist
Martin Sveningsson
Jan Scrimgeour
Dag Hanstorp
Mattias Goksör
Annette Graneli
Published in Lab Chip
Volume 10
Issue 5
Pages 617-625
ISSN 1473-0197
Publication year 2010
Published at Department of Physics (GU)
Department of Cell and Molecular Biology, Microbiology
Pages 617-625
Language en
Links dx.doi.org/10.1039/B913587A
Subject categories Other Physics Topics, Biological physics

Abstract

Cells naturally exist in a dynamic chemical environment, and therefore it is necessary to study cell behaviour under dynamic stimulation conditions in order to understand the signalling transduction pathways regulating the cellular response. However, until recently, experiments looking at the cellular response to chemical stimuli have mainly been performed by adding a stress substance to a population of cells and thus only varying the magnitude of the stress. In this paper we demonstrate an experimental method enabling acquisition of data on the behaviour of single cells upon reversible environmental perturbations, where microfluidics is combined with optical tweezers and fluorescence microscopy. The cells are individually selected and positioned in the measurement region on the bottom surface of the microfluidic device using optical tweezers. The optical tweezers thus enable precise control of the cell density as well as the total number of cells within the measurement region. Consequently, the number of cells in each experiment can be optimized while clusters of cells, that render subsequent image analysis more difficult, can be avoided. The microfluidic device is modelled and demonstrated to enable reliable changes between two different media in less than 2 s. The experimental method is tested by following the cycling of GFP-tagged proteins (Mig1 and Msn2, respectively) between the cytosol and the nucleus in Saccharomyces cerevisiae upon changes in glucose availability.

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