Abstract
IL-3, a haematopoiesis regulatory factor, has previously been shown to inhibit both mouse and human osteoclast differentiation and bone resorption. Here, the role of rat IL-3 on rat osteoclast differentiation was evaluated to address whether the inhibitory action of IL-3 on osteoclastogenesis is conserved in various species. It was observed that IL-3 inhibited rat osteoclast differentiation induced by both TNF-α and receptor activator of NF-κB ligand (RANKL). TNF-α is known to induce bone loss in postmenopausal osteoporotic women and it also synergise with many pro-osteoclastogenic cytokines to cause huge pathological bone loss. Importantly, it was found that rat IL-3 inhibits the synergistic action of TNF-α with RANKL and IL-1β, TGF-β1 and TGF-β3. IL-3 downregulates the TNF-α-induced nuclear translocation of NF-κB-p65 and c-fos without affecting c-jun. Interestingly, we observed that IL-3 also inhibits osteoclast differentiation in vivo in rats induced by TNF-α. All these results suggest that inhibitory action of IL-3 on osteoclastogenesis is conserved in various species including mice, rats and humans. Thus, our results clearly indicate that IL-3 has therapeutic potential to treat pathological bone loss in important skeletal diseases.
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Abbreviations
- RANKL:
-
Receptor activator of NF-κB ligand
- MSCs:
-
Mesenchymal stem cells
- M-CSF:
-
Macrophage colony-stimulating factor
- α-MEM:
-
Minimal essential medium-alpha modification
- TRAP:
-
Tartrate-resistant acid phosphatase
- MNCs:
-
Multinuclear cells
- CTR:
-
Calcitonin receptor
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Acknowledgements
VP is the recipient of a Senior Research Fellowship from the University Grant Commission, New Delhi, India.
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This work was supported by the intramural grant from National Centre for Cell Science, Pune.
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The Institutional Animal Ethics Committee approved all animal protocols.
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Corresponding editor: Dipankar Nandi
Corresponding editor: Dipankar Nandi
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Piprode, V., Singh, K., Kumar, A. et al. IL-3 inhibits rat osteoclast differentiation induced by TNF-α and other pro-osteoclastogenic cytokines. J Biosci 46, 63 (2021). https://doi.org/10.1007/s12038-021-00181-3
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DOI: https://doi.org/10.1007/s12038-021-00181-3