BACKGROUND: The progenitors to lung airway epithelium that are capable of long-term propagation may represent an attractive source of cells for cell-based therapies, disease modeling, toxicity testing, and others. Principally, there are two main options for obtaining lung epithelial progenitors: (i) direct isolation of endogenous progenitors from human lungs and (ii) in vitro differentiation from some other cell type. The prime candidates for the second approach are pluripotent stem cells, which may provide autologous and/or allogeneic cell resource in clinically relevant quality and quantity. METHODS: By exploiting the differentiation potential of human embryonic stem cells (hESC), here we derived expandable lung epithelium (ELEP) and established culture conditions for their long-term propagation (more than 6 months) in a monolayer culture without a need of 3D culture conditions and/or cell sorting steps, which minimizes potential variability of the outcome. RESULTS: These hESC-derived ELEP express NK2 Homeobox 1 (NKX2.1), a marker of early lung epithelial lineage, display properties of cells in early stages of surfactant production and are able to differentiate to cells exhibitting molecular and morphological characteristics of both respiratory epithelium of airway and alveolar regions. CONCLUSION: Expandable lung epithelium thus offer a stable, convenient, easily scalable and high-yielding cell source for applications in biomedicine.

Current Address Human Oncology and Pathogenesis Program Memorial Sloan Kettering Cancer Center New York City NY USA

Department of Chemistry Faculty of Science Masaryk University Brno Czech Republic

Department of Experimental Biology Faculty of Science Masaryk University Brno Czech Republic

Department of Histology and Embryology Faculty of Medicine Masaryk University Kamenice 753 5 625 00 Brno Czech Republic

Department of Plastic and Cosmetic Surgery Faculty of Medicine Masaryk University Brno Czech Republic

Department of Plastic and Cosmetic Surgery St Anne's Faculty Hospital Brno Czech Republic

Institute of Biophysics The Czech Academy of Sciences Brno Czech Republic

International Clinical Research Center St Anne's University Hospital Brno Czech Republic

Research Centre for Applied Molecular Oncology Masaryk Memorial Cancer Institute Brno Czech Republic

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