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Induction of sustained glycolytic oscillations in single yeast cells using microfluidics and optical tweezers

Conference paper
Authors Anna-Karin Gustavsson
Caroline B. Adiels
Mattias Goksör
Published in Proc. SPIE, 8458 s. 84580Y
Volume 8458
Pages 84580Y
Publication year 2012
Published at Department of Physics (GU)
Pages 84580Y
Language en
Links dx.doi.org/10.1117/12.928919
Keywords Cell heterogeneity, glycolysis, limit-cycle oscillations, microfluidic flow chamber, optical manipulation
Subject categories Optics, Optical physics, Cell Biology

Abstract

Yeast glycolytic oscillations have been studied since the 1950s in cell free extracts and in intact cells. Until recently, sustained oscillations have only been observed in intact cells at the population level. The aim of this study was to investigate sustained glycolytic oscillations in single cells. Optical tweezers were used to position yeast cells in arrays with variable cell density in the junction of a microfluidic flow chamber. The microfluidic flow chambers were fabricated using soft lithography and the flow rates in the different inlet channels were individually controlled by syringe pumps. Due to the low Reynolds number, the solutions mixed by diffusion only. The environment in the junction of the chamber could thus be controlled by changing the flow rates in the inlet channels, with a complete change of environment within 2 s. The optimum position of the cell array was determined by simulations, to ensure complete coverage of the intended solution without any concentration gradients over the cell array. Using a DAPI filter set, the NADH auto fluorescence could be monitored in up to 100 cells simultaneously. Sustained oscillations were successfully induced in individual, isolated cells within specific flow rates and concentrations of glucose and cyanide. By changing the flow rates without changing the surrounding solution, it was found that the cell behavior was dependent on the concentration of chemicals in the medium rather than the flow rates in the range tested. Furthermore, by packing cells tightly, cell-to-cell interaction and synchronization could be studied.

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