Characterization of an immortalized human small airway basal stem/progenitor cell line with airway region-specific differentiation capacity

• Published in: Respiratory research 2019-08, Vol.20 (1), p.196-196, Article 196
• Main Authors: Wang, Guoqing, Lou, Howard H, Salit, Jacqueline, Leopold, Philip L, Driscoll, Sharon, Schymeinsky, Juergen, Quast, Karsten, Visvanathan, Sudha, Fine, Jay S, Thomas, Matthew J, Crystal, Ronald G
• Format: Article
• Language: English
• Subjects: Analysis; Annotations; Basal cells; Biological markers; Biology; Biotechnology; CD4 antigen; Cell culture; Cell Differentiation; Cell Line; Cell Proliferation; Cells (biology); Chronic obstructive pulmonary disease; Cytological Techniques; Development and progression; Differentiation; Electric Impedance; Electrical junctions; Enrichment; Epithelial cells; Epithelium; Female; Fibrosis; Gene Expression; Genes; Genetic modification; Humans; Immortalization; Immunofluorescence; Lung diseases; Major histocompatibility complex; Male; Metaplasia; Middle Aged; Obstructive lung disease; Pathogenesis; Polymerase Chain Reaction; Progenitor cells; Proteins; Respiratory System - cytology; Respiratory tract; RNA-directed DNA polymerase; Single cell; Small airway; Sox9 protein; Stem cells; Stem Cells - metabolism; Surfactants; Telomerase; Telomerase - metabolism; Telomerase reverse transcriptase; Tight Junctions; Transcription factors; Transcriptome
• ISSN: 1465-993X; 1465-9921; 1465-993X; 1465-9921
• DOI: 10.1186/s12931-019-1140-9

The pathology of chronic obstructive pulmonary disease (COPD), idiopathic pulmonary fibrosis (IPF) and most lung cancers involves the small airway epithelium (SAE), the single continuous layer of cells lining the airways ≥ 6th generations. The basal cells (BC) are the stem/progenitor cells of the SAE, responsible for the differentiation into intermediate cells and ciliated, club and mucous cells. To facilitate the study of the biology of the human SAE in health and disease, we immortalized and characterized a normal human SAE basal cell line. Small airway basal cells were purified from brushed SAE of a healthy nonsmoker donor with a characteristic normal SAE transcriptome. The BC were immortalized by retrovirus-mediated telomerase reverse transcriptase (TERT) transduction and single cell drug selection. The resulting cell line (hSABCi-NS1.1) was characterized by RNAseq, TaqMan PCR, protein immunofluorescence, differentiation capacity on an air-liquid interface (ALI) culture, transepithelial electrical resistance (TEER), airway region-associated features and response to genetic modification with SPDEF. The hSABCi-NS1.1 single-clone-derived cell line continued to proliferate for > 200 doubling levels and > 70 passages, continuing to maintain basal cell features (TP63 , KRT5 ). When cultured on ALI, hSABCi-NS1.1 cells consistently formed tight junctions and differentiated into ciliated, club (SCGB1A1 ), mucous (MUC5AC , MUC5B ), neuroendocrine (CHGA ), ionocyte (FOXI1 ) and surfactant protein positive cells (SFTPA , SFTPB , SFTPD ), observations confirmed by RNAseq and TaqMan PCR. Annotation enrichment analysis showed that "cilium" and "immunity" were enriched in functions of the top-1500 up-regulated genes. RNAseq reads alignment corroborated expression of CD4, CD74 and MHC-II. Compared to the large airway cell line BCi-NS1.1, differentiated of hSABCi-NS1.1 cells on ALI were enriched with small airway epithelial genes, including surfactant protein genes, LTF and small airway development relevant transcription factors NKX2-1, GATA6, SOX9, HOPX, ID2 and ETV5. Lentivirus-mediated expression of SPDEF in hSABCi-NS1.1 cells induced secretory cell metaplasia, accompanied with characteristic COPD-associated SAE secretory cell changes, including up-regulation of MSMB, CEACAM5 and down-regulation of LTF. The immortalized hSABCi-NS1.1 cell line has diverse differentiation capacities and retains SAE features, which will be useful for understanding the biology of SAE, th