Abstract
Background
Basal stem/progenitor cells of airway epithelium from chronic obstructive pulmonary disease (COPD) patients have a decrease in differentiation and self-renewal potential. Our study aimed at identifying deregulations in the genetic program of these cells that could account for their exhaustion, focusing on genes downstream of the epithelial–mesenchymal transition-inducing transcription factor Slug/Snail2 and responding to transforming growth factor (TGF)-β. TGF-β is at higher levels in COPD patient lungs, plays a role in stem/progenitor cell fate and regulates the expression of Slug/Snail2 that is highly expressed in airway basal stem/progenitors.
Methods and results
We reanalyzed a gene expression dataset that we generated from COPD and normal primary bronchial basal progenitor cells knocked down for Slug/Snail2 gene. Among the genes that we identified to be repressed downstream of Slug/Snail2 in COPD, we selected those responding to differentiation and TGF-β. The large majority of these genes are upregulated with differentiation but repressed by TGF-β. Pathway and ontology enrichment analysis revealed a set of genes coding for transcription factors involved in stem cell maintenance that are repressed downstream of Slug/Snail2 and by TGF-β in COPD but not normal basal progenitor cells. We also reveal a link between Slug/Snail2 expression and the repressive effect of TGF-β on these stem cell maintenance genes.
Conclusion
Our work brings a new insight and molecular perspective to the exhaustion of basal stem/progenitor cells observed in the airway epithelium of COPD patients, revealing that stem cell maintenance genes are repressed in these cells, with TGF-β and Slug/Snail2 being involved in this deregulation.
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Data availability
Data analyzed in this study are deposited in the NCBI’s Gene Expression Omnibus (GEO) database (GSE123129 and GSE122957).
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Acknowledgements
We thank the Thoracic Surgery Department, the Pathology Department and the Pulmonary Department at the University Hospital Bichat-Claude Bernard (Paris, France) and the INSERM UMR1152 for providing lung tissues and for isolating the cells.
Funding
PL is supported by the French National Center for Scientific Research (CNRS). This work was funded by a donation of the Association Science et Technologie (Groupe Servier) (140065/ZA) to PL and by funding from the French National Institute for Medical Research (INSERM).
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Study conception and design: PL; Conceived and Designed Experiments PL, PdlG; Conducted experiments, analyzed and interpreted data: CBB, CC, AJ, PdlG, PL; Writing—draft preparation, review and editing: PL, PdlG; Supervision: PL, PdlG; Funding acquisition: PL.
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This study was done in accordance to the principles of the Declaration of Helsinki. Approval IRB 00006477 was obtained from Paris 7 University ethics committee, Paris Nord, France.
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de la Grange, P., Jolly, A., Courageux, C. et al. Genes coding for transcription factors involved in stem cell maintenance are repressed by TGF-β and downstream of Slug/Snail2 in COPD bronchial epithelial progenitors. Mol Biol Rep 48, 6729–6738 (2021). https://doi.org/10.1007/s11033-021-06664-8
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DOI: https://doi.org/10.1007/s11033-021-06664-8