Tissue-scale in vitro epithelial wrinkling and wrinkle-to-fold transition
Jaeseung Youn, Dohui Kim, Hyunsu Kwak, Anna Lee, Dong Sung Kim, Dong Sung Kim, Dong Sung Kim
Abstract
Although epithelial folding is commonly studied using in vivo animal models, such models exhibit critical limitations in terms of real-time observation and independent control of experimental parameters. Here, we develop a tissue-scale in vitro epithelial bilayer folding model that incorporates an epithelium and extracellular matrix (ECM) hydrogel, thereby emulating various folding structures found in in vivo epithelial tissue. Beyond mere folding, our in vitro model realizes a hierarchical transition in the epithelial bilayer, shifting from periodic wrinkles to a single deep fold under compression. Experimental and theoretical investigations of the in vitro model imply that both the strain-stiffening of epithelium and the poroelasticity of ECM influence the folded structures of epithelial tissue. The proposed in vitro model will aid in investigating the underlying mechanism of tissue-scale in vivo epithelial folding relevant to developmental biology and tissue engineering. The study of epithelial folding is often hampered by limited real-time observation and limited control of experimental parameters. Here, the authors develop a tissue-scale in vitro epithelial folding model that incorporates an epithelium and extracellular matrix hydrogel, thus emulating folding behaviors found in in vivo contexts.