Abstract
Angiotensin-II (Ang-II) receptor plays a role in allergic airway inflammation; however, the underlying mechanism and role of macrophages need better understanding. In the present study, angiotensin-II infusion (1 μg/kg/min) in ovalbumin-induced airway inflammation mice model significantly decreased immune cell infiltration, goblet cell hyperplasia, and eosinophil numbers in lungs. Ang-II infusion increased M1 and decreased M2 macrophage population in bronchoalveolar lavage fluid and respective macrophage markers in lung macrophages. Similarly, in vitro Ang-II treatment in murine bone marrow-derived macrophages (BMDMs) induced M1 and reduced M2 macrophage phenotype with enhanced bactericidal activity. Mechanistically, Ang-II inhibits Let-7c and miR-99a expression in BMDMs and in vivo as well. Lentiviral overexpression of Let-7c and miR-99a miRNAs in BMDMs abrogated Ang-II-induced M1 phenotype activation and promoted M2 phenotype, which is governed by targeting TNFα by miR-99a. In lung macrophages, ovalbumin-induced TNFα inhibition was rescued after Ang-II treatment. In BMDMs, knockdown of TNFα abrogated Ang-II-induced M2 to M1 macrophage phenotype switch and associated bactericidal activity. Ang-II affects mature miRNA formation by enhancing Lin28B levels in macrophages in vivo and in vitro. Furthermore, Lin28B knockdown prevented Ang-II-mediated inhibition of mature Let-7c/miR-99a miRNA formation, M2 to M1 macrophage phenotype switch, and increased bactericidal activity. Therefore, present study suggests a role of Lin28B in Ang-II-induced Let-7c/miR-99a miRNA formation that consequently affects TNFα production, M1 phenotype activation, and allergic airway inflammation.
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Abbreviations
- AAI:
-
allergic airway inflammation
- BALF:
-
bronchoalveolar lavage fluid
- Angiotensin-II:
-
Ang-II
- MCSF:
-
macrophage colony stimulating factor
- BMDMs:
-
bone marrow-derived macrophages
- TNF:
-
tumor necrosis factor
- PPARγ:
-
peroxisome proliferator-activated receptor gamma
- 3’UTR:
-
3′untranslated region
- TU/ml:
-
transduction units per ml
- PFU:
-
plaque-forming unit
- CFU:
-
colony-forming unit
- hr.:
-
hour
- shTNF:
-
TNF-shRNA
- Chr:
-
chromosome
- H&E:
-
hematoxylin and eosin
- PAS:
-
periodic acid-Schiff
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Acknowledgments
The authors of this manuscript acknowledge the technical help provided by Mr. C.P. Pandey and Mr. A.L. Vishwakarma. UGC, New Delhi, supports A.J. and M.M., and CSIR, New Delhi, supports P.M. This manuscript has CSIR-CDRI Communication number: 10054.
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This work was supported by the Council of Scientific and Industrial Research (CSIR) and CSIR-CDRI.
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A.J. performed major experiments and wrote the manuscript. M.M. performed staining and some in vivo experiments, P.M. helped in in vivo experiments, and M.K.B. conceptualized and supervised this study and manuscript writing.
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Jaiswal, A., Maurya, M., Maurya, P. et al. Lin28B Regulates Angiotensin II-Mediated Let-7c/miR-99a MicroRNA Formation Consequently Affecting Macrophage Polarization and Allergic Inflammation. Inflammation 43, 1846–1861 (2020). https://doi.org/10.1007/s10753-020-01258-1
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DOI: https://doi.org/10.1007/s10753-020-01258-1