Abstract
Leukemia inhibitory factor (LIF) is known to play a major role in bone physiology. In the present study, we examined the in vitro effects of LIF on osteoblast differentiation of bone marrow stem cells (BMSCs) and explored in vivo effects of LIF on the bone repair capacity of BMSCs-loaded biphasic calcium phosphate (BCP) scaffolds in mouse calvarial bone defect model. The mRNA and protein expression levels in the BMSCs were determined by quantitative real-time PCR and western blot, respectively; the in vitro osteoblast differentiation of the BMSCs was evaluated by using Alizarin Red S staining. The bone volume and bone density in the repaired calvarial bone defect were determined by Micro-CT. Bone regeneration was also histologically evaluated by hematoxylin and eosin staining and Masson’s trichrome staining. Hypoxia treatment induced the up-regulation of Lif mRNA and LIF protein in the BMSCs. Lif overexpression up-regulated the mRNA expression levels of osteopontin and Runt-related transcription factor 2, and increased intensity of Alizarin Red S staining in the BMSCs; while Lif silence exerted the opposite effects. The in vivo studies showed that implantation of Lif-overexpressing BMSCs-loaded BCP scaffolds significantly increased the bone volume and bone density at 4 and 8 weeks after transplantation, and promoted the regeneration of bone tissues in the mouse calvarial bone defect at 8 weeks after transplantation when compared to the BMSCs-loaded BCP scaffolds group; while Lif-silencing BMSCs-loaded BCP scaffolds had the opposite effects. The present study for the first time demonstrated that LIF promoted the in vitro osteoblast differentiation of hypoxia-treated BMSCs; and further studies revealed that LIF exerted enhanced effects on the bone repair capacity of BMSCs-load BCP scaffolds in mouse calvarial bone defect model. However, future studies are warranted to determine the detailed mechanisms of LIF in the large-scale bone defect repair.
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This study was supported by the Shenzhen Science and Technology Innovative Project (No. JCYJ20180302144621755).
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RZ, XL and YL performed the study and analyzed the experimental data. ZL, LY, CC and XY performed the statistical analysis. RZ and YL designed the study and wrote the manuscript.
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Supplemental Figure S1
Effects of hypoxia on the cell proliferation and OPN expression in BMSCs. (a) The cell proliferation of the control BMSCs and hypoxia-treated BMSCs was determined by CCK-8 assay. (b) The Opn mRNA expression levels inthe control BMSCs and hypoxia-treated BMSCs was determined by qRT-PCR. CON = control; N = 3, ***P < 0.05. (PNG 39 kb)
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Liang, Y., Zhou, R., Liu, X. et al. Investigation into the effects of leukemia inhibitory factor on the bone repair capacity of BMSCs-loaded BCP scaffolds in the mouse calvarial bone defect model. J Bioenerg Biomembr 53, 381–391 (2021). https://doi.org/10.1007/s10863-021-09899-z
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DOI: https://doi.org/10.1007/s10863-021-09899-z