Due to the lack of precise microstructure and functions of the two-dimensional culture model, the in vitro culture models of lung organoids and lung-on-chips, as two main research tools to mimic lung development, homeostasis, injury, and regeneration, allow further exploration of pulmonary fibrosis, lung cancer, and other diseases. Lung organoid refers to isolated lung epithelial stem cells growing in a three-dimensional environment in vitro to form mini-clusters of cells that self-renew, self-reorganize, and differentiate into functional cell types. Based on the microfluidic chip technology, lung-on-chips use porous flexible membrane made of poly to provide tissue-layered structures for cells and simulate microenvironment and mechanical forces. We reviewed the classification, research and development history, establishment methods, practical applications, advantages and disadvantages of two main in vitro culture models derived from lung adult stem cells, hoping to provide a reference for organ transplantation and regeneration and drug screening.
Keywords: differentiation; lung; organ-on-chip; organoid; self-renewing.