scholarly journals In vitro and in vivo assessment of nanostructured porous biphasic calcium phosphate ceramics for promoting osteogenesis in an osteoporotic environment

RSC Advances ◽  
2018 ◽  
Vol 8 (26) ◽  
pp. 14646-14653 ◽  
Author(s):  
Kun Zhang ◽  
Jieyu Zhang ◽  
Kelei Chen ◽  
Xuefeng Hu ◽  
Yunbing Wang ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Bone Defect ◽  
Biphasic Calcium Phosphate ◽  
Calcium Phosphate Ceramics ◽  
Defect Healing ◽  
Bone Defect Healing ◽  
In Vivo Assessment ◽  
Porous Biphasic Calcium Phosphate

Nanostructured porous biphasic calcium phosphate ceramics are able to significantly promote bone defect healing in an osteoporotic environment.

scholarly journals Cellular hypoxia promotes osteogenic differentiation of mesenchymal stem cells and bone defect healing via STAT3 signaling

2019 ◽  
Vol 24 (1) ◽  
Author(s):  
Xin Yu ◽  
Qilong Wan ◽  
Xiaoling Ye ◽  
Yuet Cheng ◽  
Janak L. Pathak ◽  
...  
Keyword(s):  
Osteogenic Differentiation ◽  
Bone Defect ◽  
Precursor Cells ◽  
Defect Healing ◽  
Stat3 Signaling ◽  
Bone Defect Healing ◽  
Cellular Hypoxia

Abstract Background Hypoxia in the vicinity of bone defects triggers the osteogenic differentiation of precursor cells and promotes healing. The activation of STAT3 signaling in mesenchymal stem cells (MSCs) has similarly been reported to mediate bone regeneration. However, the interaction between hypoxia and STAT3 signaling in the osteogenic differentiation of precursor cells during bone defect healing is still unknown. Methods In this study, we assessed the impact of different durations of CoCl2-induced cellular hypoxia on the osteogenic differentiation of MSCs. Role of STAT3 signaling on hypoxia induced osteogenic differentiation was analyzed both in vitro and in vivo. The interaction between cellular hypoxia and STAT3 signaling in vivo was investigated in a mouse femoral bone defect model. Results The peak osteogenic differentiation and expression of vascular endothelial growth factor (VEGF) occurred after 3 days of hypoxia. Inhibiting STAT3 reversed this effect. Hypoxia enhanced the expression of hypoxia-inducible factor 1-alpha (HIF-1α) and STAT3 phosphorylation in MSCs. Histology and μ-CT results showed that CoCl2 treatment enhanced bone defect healing. Inhibiting STAT3 reduced this effect. Immunohistochemistry results showed that CoCl2 treatment enhanced Hif-1α, ALP and pSTAT3 expression in cells present in the bone defect area and that inhibiting STAT3 reduced this effect. Conclusions The in vitro study revealed that the duration of hypoxia is crucial for osteogenic differentiation of precursor cells. The results from both the in vitro and in vivo studies show the role of STAT3 signaling in hypoxia-induced osteogenic differentiation of precursor cells and bone defect healing.

Transplantation of copper-doped calcium polyphosphate scaffolds combined with copper (II) preconditioned bone marrow mesenchymal stem cells for bone defect repair

2018 ◽  
Vol 32 (6) ◽  
pp. 738-753 ◽  
Author(s):  
Yanhong Li ◽  
Jing Wang ◽  
Yuliang Wang ◽  
Wenjia Du ◽  
Shuanke Wang
Keyword(s):  
Bone Defect ◽  
Hypoxia Inducible Factor ◽  
Hypoxia Inducible Factor 1 ◽  
Defect Healing ◽  
Calcium Polyphosphate ◽  
Bone Defect Healing ◽  
Marrow Mesenchymal Stem Cells ◽  
Osteogenic Factors

Calcium polyphosphate is a bioactive ceramic that possesses similar mineral components to bone and possess good physicochemical properties. However, pure calcium polyphosphate scaffold is brittle, and it is insufficient in promoting vascularization and osteoinductivity. This study was conducted to assess whether copper (Cu) incorporated into calcium polyphosphate could improve the scaffolds’ inherent shortcomings. In the experiments, Cu-calcium polyphosphate scaffolds’ mechanical strength, biocompatibility, and biodegradability were researched primarily. And then, hypoxia-inducible factor 1-alpha expression along with angiogenesis and osteogenesis potential when the scaffolds treated with the bone marrow mesenchymal stem cells (BMMSCs) were analyzed in vitro. In in vivo studies, the Cu-calcium polyphosphate scaffolds combined with the liquid extract preconditioned BMMSCs were implanted into animal model to repair the bone defects. Meanwhile, we also evaluate the expression of angiogenic and osteogenic factors. For comparison, Cu-calcium polyphosphate, calcium polyphosphate, and blank control groups were designed. According to the results, proper content of Cu incorporated with calcium polyphosphate (0.1% Cu-calcium polyphosphate) did not significantly change the scaffold’s degradation velocity, but it obtained higher compress mechanical strength and Cu-doped scaffolds were less brittle. Besides, these scaffolds incorporated with Cu showed better cytocompatibility and cell proliferation activity. Moreover, after Cu was doped, the hypoxia-inducible factor 1-alpha expression was up-regulated with the angiogenic and osteogenic factors levels increased both in in vitro and in vivo study. The bone defect healing capacity was accessed, using Cu-calcium polyphosphate combined with preconditioned BMMSCs further enhanced new bone formation and improved hypoxia-inducible factor 1-alpha, alkaline phosphatase, osteocalcin, and vascular endothelial growth factor expression. In conclusion, doped Cu into calcium polyphosphate was an alternative strategy for improving calcium polyphosphate’s mechanical property and promoting the osteogenesis and angiogenesis potential. Using Cu-calcium polyphosphate scaffolds combined with Cu preconditioned BMMSCs to treat bone defect could enhance bone defect healing.

Effect of surface structure on protein adsorption to biphasic calcium-phosphate ceramics in vitro and in vivo

2009 ◽  
Vol 5 (4) ◽  
pp. 1311-1318 ◽  
Author(s):  
X.D. Zhu ◽  
H.S. Fan ◽  
Y.M. Xiao ◽  
D.X. Li ◽  
H.J. Zhang ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Surface Structure ◽  
Protein Adsorption ◽  
Biphasic Calcium Phosphate ◽  
Calcium Phosphate Ceramics ◽  
Effect Of Surface

scholarly journals Chondrogenic and BMP-4 primings confer osteogenesis potential to human cord blood mesenchymal stromal cells delivered with biphasic calcium phosphate ceramics

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Meadhbh Á. Brennan ◽  
Mario Barilani ◽  
Francesco Rusconi ◽  
Julien de Lima ◽  
Luciano Vidal ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Calcium Phosphate ◽  
Bone Formation ◽  
Cord Blood ◽  
Stromal Cells ◽  
Biphasic Calcium Phosphate ◽  
Bone Repair ◽  
Calcium Phosphate Ceramics

AbstractBone marrow mesenchymal stem/stromal cells (BMSCs) show great promise for bone repair, however they are isolated by an invasive bone marrow harvest and their regenerative potential decreases with age. Conversely, cord blood can be collected non-invasively after birth and contains MSCs (CBMSCs) that can be stored for future use. However, whether CBMSCs can replace BMSCs targeting bone repair is unknown. This study evaluates the in vitro osteogenic potential of unprimed, osteogenically primed, or chondrogenically primed CBMSCs and BMSCs and their in vivo bone forming capacity following ectopic implantation on biphasic calcium phosphate ceramics in nude mice. In vitro, alkaline phosphatase (intracellular, extracellular, and gene expression), and secretion of osteogenic cytokines (osteoprotegerin and osteocalcin) was significantly higher in BMSCs compared with CBMSCs, while CBMSCs demonstrated superior chondrogenic differentiation and secretion of interleukins IL-6 and IL-8. BMSCs yielded significantly more cell engraftment and ectopic bone formation compared to CBMSCs. However, priming of CBMSCs with either chondrogenic or BMP-4 supplements led to bone formation by CBMSCs. This study is the first direct quantification of the bone forming abilities of BMSCs and CBMSCs in vivo and, while revealing the innate superiority of BMSCs for bone repair, it provides avenues to induce osteogenesis by CBMSCs.

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