Abstract
Respiratory epithelium is a highly integrated structure that efficiently protects lungs from extrinsic irritants thanks to rapid repair of the wound. The repair is a complex process that requires coordinated expression of networks of genes. Plausible regulators of this process are microRNAs. We investigated whether global miRNA silencing influences the epithelial repair, and whether changes in miRNA expression profile during repair are similar between two bronchial epithelial cell cultures: differentiated and undifferentiated cells. Two bronchial cell types were used:16HBE14o- and NHBE. Transfection was performed with siRNAs against Drosha and Dicer. For miRNA profiling, non-transfected cells were cultured until confluent and harvested for RNA isolation at baseline (cells before wounding) and at different time post-wounding (8, 16, 24, and 48 h). MicroRNA expression profiling was performed using TaqMan Array Human MicroRNA Card A. Target prediction was done in miRNA body map, and pathway analysis using DAVID. Cells with downregulated Drosha and Dicer demonstrated a significantly delayed wound repair in comparison to control in both cell lines. MiRNA expression profiling revealed that ten miRNAs exhibited significant changes over time after cell injury. These genes showed a similar expression pattern in both cell lines. The predicted targets of these miRNAs were then clustered by pathway analysis into six biological groups related to wound repair. Silencing of global miRNA expression confirmed that miRNAs are crucial for airway epithelial repair. Moreover, epithelial cells of two different origins demonstrated some similarities in miRNA expression pattern during wound repair, independent of differentiation state.
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Acknowledgments
This study was supported by the Polish National Science Centre grant no. 2011/01/M/NZ3/02906.
BN was a recipient of an European Academy of Allergology and Immunology (EAACI) Exchange Research Fellowship 2015.
We thank the personnel from the Biomedical Imaging Unit, University of Southampton, for their assistance and technical support.
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Communicated by: Michal Witt
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Langwinski, W., Narozna, B., Lackie, P.M. et al. Comparison of miRNA profiling during airway epithelial repair in undifferentiated and differentiated cells in vitro. J Appl Genetics 58, 205–212 (2017). https://doi.org/10.1007/s13353-016-0370-5
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DOI: https://doi.org/10.1007/s13353-016-0370-5