Abstract
Objective
MiRNAs have been recently implicated in the pathogenesis of ischemia-reperfusion (IR) injury. This study aimed to investigate the miRNA expression profiles in the early stages after lung transplantation (LT) and to study the involvement of the Toll-like receptor (TLR) signaling pathway in lung IR injury following LT.
Methods
We established the left LT model in mice and selected the miRNA-122 as a research target. The mice were injected with a miRNA-122-specific inhibitor, following which pathological changes in the lung tissue were studied using different lung injury indicators. In addition, we performed deep sequencing of transplanted lung tissues to identify differentially expressed (DE) miRNAs and their target genes. These target genes were used to further perform gene ontology (GO) enrichment analysis and Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis.
Results
A total of 12 DE miRNAs were selected, and 2476 target genes were identified. The GO enrichment analysis predicted 6063 terms, and the KEGG analysis predicted 1554 biological pathways. Compared with the control group, inhibiting the expression of miRNA-122 significantly reduced the lung injury and lung wet/dry ratio (P<0.05). In addition, the activity of myeloperoxidase and the expression levels of tumor necrosis factor-alpha and TLR2/4 were decreased (P<0.05); whereas the expression of interleukin-10 was increased (P<0.05). Furthermore, the inhibition of miRNA-122 suppressed the IR injury-induced activation of the TLR signaling pathway.
Conclusion
Our findings showed the differential expression of several miRNAs in the early inflammatory response following LT. Of these, miRNA-122 promoted IR injury following LT, whereas its inhibition prevented IR injury in a TLR-dependent manner.
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Acknowledgments
First of all, I would like to express my sincere thanks to all those who have helped me in the course of my writing this paper. I would also like to take this opportunity to show my sincere gratitude to my supervisors, Zhi-kun ZHENG and Jin-song LI. They gave me many useful suggestions on my writing and tried their best to improve my thesis. Secondly, I would like to express my gratitude to my classmates who offered me references and information on time. Last but not the least, I would like to thank my teachers and their staff. Without their help, it would be much more difficult for me to finish my study and this paper.
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Conflict of Interest Statement
The authors declare that they have no conflicts of interest.
Author Jin-song LI is a member of the Editorial Board for Current Medical Science. The paper was handled by the other editor and has undergone rigorous peer review process. Author Jin-song LI was not involved in the journal’s review of, or decision related to, this manuscript.
This study was supported by grants from the National Natural Science Foundation of China (No. 81600074) and Hubei Natural Science Foundation (No. 2017CFB473).
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Lu, Y., Wang, Yl., Liu, Q. et al. MiRNA-122 Promotes Ischemia-Reperfusion Injury after Lung Transplantation via the Toll-like Receptor Signaling Pathway. CURR MED SCI 41, 1231–1238 (2021). https://doi.org/10.1007/s11596-021-2487-y
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DOI: https://doi.org/10.1007/s11596-021-2487-y