The differentiation of distal lung epithelium from embryonic stem cells.

The potential for embryonic stem (ES) cells to differentiate into cells with a distal lung epithelial phenotype has been demonstrated using different in vitro culture methods. Three separate protocols are described here that utilize both murine and human ES cells. The distal lung epithelial phenotype is induced through the use of embryonic distal lung mesenchyme in coculture systems with differentiating embryoid bodies or the use of soluble factors in defined media to maximize definitive endoderm formation and select and maintain the desired phenotype. Phenotypic analysis is demonstrated using immunocytochemistry and SP-C promoter-eGFP reporter gene expression in transgenic ES cells. These methods provide an increased efficiency of distal lung epithelial derivation from ES cells and, therefore, they provide the foundation for the development of a cell replacement product to treat chronic lung disease or a useful in vitro model for the study of lung disease and development.

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