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Patterning alginate hydrogels using light-directed release of caged calcium in a microfluidic device

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Abstract

This paper describes a simple reversible hydrogel patterning method for 3D cell culture. Alginate gel is formed in select regions of a microfluidic device through light-triggered release of caged calcium. In the pre-gelled alginate solution, calcium is chelated by DM-nitrophen (DM-n) to prevent cross-linking of alginate. After sufficient UV exposure the caged calcium is released from DM-n causing alginate to cross-link. The effect of using different concentrations of calcium and chelating agents as well as the duration of UV exposure is described. Since the cross-linking is based on calcium concentration, the cross-linked alginate can easily be dissolved by EDTA. We also demonstrate application of this capability to patterned microscale 3D co-culture using endothelial cells and osteoblastic cells in a microchannel.

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Acknowledgement

This material is based on work supported by the U.S. Army Research Laboratory and the U.S. Army Research Office under Contract Grant DAAD19-03-1-0168 and the NIH (HG004653).

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Correspondence to Shuichi Takayama.

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Chueh, Bh., Zheng, Y., Torisawa, Ys. et al. Patterning alginate hydrogels using light-directed release of caged calcium in a microfluidic device. Biomed Microdevices 12, 145–151 (2010). https://doi.org/10.1007/s10544-009-9369-6

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  • DOI: https://doi.org/10.1007/s10544-009-9369-6

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