Abstract
Idiopathic Pulmonary Fibrosis (IPF) is a progressively fatal and incurable disease characterized by the loss of alveolar structures, increased epithelial–mesenchymal transition (EMT), and aberrant tissue repair. In this study, we investigated the role of Nuclear Factor I-B (NFIB), a transcription factor critical for lung development and maturation, in IPF. Using both human lung tissue samples from patients with IPF, and a mouse model of lung fibrosis induced by bleomycin, we showed that there was a significant reduction of NFIB both in the lungs of patients and mice with IPF. Furthermore, our in vitro experiments using cultured human lung cells demonstrated that the loss of NFIB was associated with the induction of EMT by transforming growth factor beta (TGF-β). Knockdown of NFIB promoted EMT, while overexpression of NFIB suppressed EMT and attenuated the severity of bleomycin-induced lung fibrosis in mice. Mechanistically, we identified post-translational regulation of NFIB by miR-326, a miRNA with anti-fibrotic effects that is diminished in IPF. Specifically, we showed that miR-326 stabilized and increased the expression of NFIB through its 3'UTR target sites for Human antigen R (HuR). Moreover, treatment of mice with either NFIB plasmid or miR-326 reversed airway collagen deposition and fibrosis. In conclusion, our study emphasizes the critical role of NFIB in lung development and maturation, and its reduction in IPF leading to EMT and loss of alveolar structures. Our study highlights the potential of miR-326 as a therapeutic intervention for IPF.
Graphical abstract
The schema shows the role of NFIB in maintaining the normal epithelial cell characteristics in the lungs and how its reduction leads to a shift towards mesenchymal cell-like features and pulmonary fibrosis. A In normal lungs, NFIB is expressed abundantly in the epithelial cells, which helps in maintaining their shape, cell polarity and adhesion molecules. However, when the lungs are exposed to factors that induce pulmonary fibrosis, such as bleomycin, or TGF-β, the epithelial cells undergo epithelial to mesenchymal transition (EMT), which leads to a decrease in NFIB. B The mesenchymal cells that arise from EMT appear as spindle-shaped with loss of cell junctions, increased cell migration, loss of polarity and expression of markers associated with mesenchymal cells/fibroblasts. C We designed a therapeutic approach that involves exogenous administration of NFIB in the form of overexpression plasmid or microRNA-326. This therapeutic approach decreases the mesenchymal cell phenotype and restores the epithelial cell phenotype, thus preventing the development or progression of pulmonary fibrosis.
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Data availability
The datasets generated during the current study are available from the corresponding author upon reasonable request.
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Acknowledgements
The authors would like to thank Dr. Kritika Khanna, Dr. Naveen K Bhatraju, Dr. Manish Kumar, Dr. Dhurjyoti Saha, and Dr. Prashant Bajpai from CSIR-IGIB, India for their valuable assistance in this study. We also acknowledge the microscopy facility of the Council for Scientific and Industrial Research Institute of Genomics and Integrative Biology (CSIR-IGIB) for their support in confocal microscopy.
Funding
This work was supported by grants from the Council of Scientific and Industrial Research (CSIR), India (MLP5502, BSC 0116, GAP0069 and MLP 1201); Swarnajayanti Fellowship (Anurag Agrawal), Department of Science and Technology (DST), India, and Wellcome Trust India Alliance Senior Fellowship (Anurag Agrawal), GAP0084 (Balaram Ghosh). Dr. Tanveer Ahmad acknowledges funding support from the core research grant of the Science and Engineering Research Board (CRG/2020/002294) and the extramural grant of the Indian Council of Medical Research (ICMR) (GIA/2019/000274/PRCGIA (Ver-1)).
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BP, TA, BG and AA: conceptualized and established the hypotheses, designed the study; BP: executed the experiments; performed data acquisition, analysis, and interpretation; BP, TA and AA: drafted the manuscript; critically revised the manuscript, and performed statistical analysis. KD, AG, and BP, VN and RC: were involved in mice experiments, data acquisition, and analysis; performed histology and imaging; assisted critical revision of the manuscript; and provided technical support. MF, AA, MS, SA: critically revised the manuscript, and performed statistical analysis. YSP: provided human lung samples from patients with IPF and non-fibrotic control subjects and was involved in critical revision of the manuscript. RG was involved in critical revision of the manuscript. TA, BG and AA: provided the financial support.
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The study design was approved by the Institutional Animal Ethics Committee (IAEC) for using mice models. The collection of human tissue samples was performed only after obtaining approval from the Mayo Clinic Institutional Review Board, which ensures that research studies involving human subjects are conducted in an ethical and safe manner.
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Pattnaik, B., Negi, V., Chaudhuri, R. et al. MiR-326-mediated overexpression of NFIB offsets TGF-β induced epithelial to mesenchymal transition and reverses lung fibrosis. Cell. Mol. Life Sci. 80, 357 (2023). https://doi.org/10.1007/s00018-023-05005-1
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DOI: https://doi.org/10.1007/s00018-023-05005-1