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A New Integrated Lab-on-a-Chip System for Fast Dynamic Study of Mammalian Cells under Physiological Conditions in Bioreactor
Institute of Bioprocess and Biosystems Engineering, Hamburg University of Technology, Denickestraße 15, 21073 Hamburg, Germany
Institute of Microsystems Technology, Hamburg University of Technology, Eissendorfer Strasse 42, 21073 Hamburg, Germany
* Author to whom correspondence should be addressed.
Received: 1 April 2013; in revised form: 29 April 2013 / Accepted: 16 May 2013 / Published: 27 May 2013
Abstract: For the quantitative analysis of cellular metabolism and its dynamics it is essential to achieve rapid sampling, fast quenching of metabolism and the removal of extracellular metabolites. Common manual sample preparation methods and protocols for cells are time-consuming and often lead to the loss of physiological conditions. In this work, we present a microchip-bioreactor setup which provides an integrated and rapid sample preparation of mammalian cells. The lab-on-a-chip system consists of five connected units that allow sample treatment, mixing and incubation of the cells, followed by cell separation and simultaneous exchange of media within seconds. This microsystem is directly integrated into a bioreactor for mammalian cell cultivation. By applying overpressure (2 bar) onto the bioreactor, this setup allows pulsation free, defined, fast, and continuous sampling. Experiments evince that Chinese Hamster Ovary cells (CHO-K1) can be separated from the culture broth and transferred into a new medium efficiently. Furthermore, this setup permits the treatment of cells for a defined time (9 s or 18 s) which can be utilized for pulse experiments, quenching of cell metabolism, and/or another defined chemical treatment. Proof of concept experiments were performed using glutamine containing medium for pulse experiments. Continuous sampling of cells showed a high reproducibility over a period of 18 h.
Keywords: biomicrofluidics; lab-on-a-Chip; mammalian cells; metabolism; integrated bioreactor
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Bahnemann, J.; Rajabi, N.; Fuge, G.; Barradas, O.P.; Müller, J.; Pörtner, R.; Zeng, A.-P. A New Integrated Lab-on-a-Chip System for Fast Dynamic Study of Mammalian Cells under Physiological Conditions in Bioreactor. Cells 2013, 2, 349-360.
Bahnemann J, Rajabi N, Fuge G, Barradas OP, Müller J, Pörtner R, Zeng A-P. A New Integrated Lab-on-a-Chip System for Fast Dynamic Study of Mammalian Cells under Physiological Conditions in Bioreactor. Cells. 2013; 2(2):349-360.
Bahnemann, Janina; Rajabi, Negar; Fuge, Grischa; Barradas, Oscar P.; Müller, Jörg; Pörtner, Ralf; Zeng, An-Ping. 2013. "A New Integrated Lab-on-a-Chip System for Fast Dynamic Study of Mammalian Cells under Physiological Conditions in Bioreactor." Cells 2, no. 2: 349-360.