Construction of modular hydrogel sheets for micropatterned macro-scaled 3D cellular architecture

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Hydrogels can be patterned at the micro-scale using microfluidic or micropatterning technologies to provide an in vivo-like three-dimensional (3D) tissue geometry. The resulting 3D hydrogel-based cellular constructs have been introduced as an alternative to animal experiments for advanced biological studies, pharmacological assays and organ transplant applications. Although hydrogel-based particles and fibers can be easily fabricated, it is difficult to manipulate them for tissue reconstruction. In this video, we describe a fabrication method for micropatterned alginate hydrogel sheets, together with their assembly to form a macro-scale 3D cell culture system with a controlled cellular microenvironment. Using a mist form of the calcium gelling agent, thin hydrogel sheets are easily generated with a thickness in the range of 100 - 200 mu m, and with precise micropatterns. Cells can then be cultured with the geometric guidance of the hydrogel sheets in freestanding conditions. Furthermore, the hydrogel sheets can be readily manipulated using a micropipette with an end-cut tip, and can be assembled into multi-layered structures by stacking them using a patterned polydimethylsiloxane (PDMS) frame. These modular hydrogel sheets, which can be fabricated using a facile process, have potential applications of in vitro drug assays and biological studies, including functional studies of micro-and macrostructure and tissue reconstruction.
Publisher
JOURNAL OF VISUALIZED EXPERIMENTS
Issue Date
2016-01
Language
English
Article Type
Article
Citation

JOVE-JOURNAL OF VISUALIZED EXPERIMENTS, v.107, pp.e53475

ISSN
1940-087X
DOI
10.3791/53475
URI
http://hdl.handle.net/10203/207699
Appears in Collection
BiS-Journal Papers(저널논문)
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