• 1. Orthopedic Centre, Affiliated Hospital of Guangdong Medical College, Zhanjiang Guangdong, 524001, P.R.China;
  • 2. Reproductive Research Centre, Affiliated Hospital of Guangdong Medical College, Zhanjiang Guangdong, 524001, P.R.China;
WEIBo, Email: webjxmc@163.com; SONGLijun, Email: 413000667@qq.com
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Objective  To explore the paracrine effect of bone marrow mesenchymal stem cells (BMSCs) on dexamethasone-induced inhibition of osteoblast function in vitro. Methods  The serum free conditioned medium of mouse BMSCs cultured for 24 hours was prepared for spare use. The 3rd passage of MC3T3-E1 cells were divided into 4 groups: the control group (group A), dexamethasone group (group B), dexamethasone+BMSCs conditioned medium (1:1) group (group C), and BMSCs conditioned medium group (group D). After 24 hours of culture, the alkaline phosphatase (ALP) content was determined; the protein expressions of RUNX2 and Osteocalcin were detected by Western blot; and the gene expressions of collagen type I-α 1 (COL1A1), RUNX2, ALP, and Osteocalcin were detected by real-time fluorescence quantitative PCR (RT-qPCR); alizarin red staining was used to observe calcium nodules formation at 21 days. Results  After cultured for 24 hours, ALP content was significantly lower in groups B, C, and D than group A, and in group B than groups C and D (P < 0.05), but no significant difference was found between groups C and D (P > 0.05). The relative protein expression of RUNX2 of group B was significantly lower than that of groups A, C, and D (P < 0.05), but difference was not significant between groups A, C, and D (P > 0.05). The relative protein expression of Osteocalcin was significantly lower in group B than groups A, C, and D, in groups A and C than group D (P < 0.05), but difference had no significance between groups A and C (P > 0.05). The relative gene expressions of RUNX2, Osteocalcin, COL1A1, and ALP of groups B, C, and D were significantly lower than those of group A (P < 0.05); the relative gene expressions of RUNX2, Osteocalcin, and ALP were significantly higher in group D than groups B and C, in group C than group B (P < 0.05). The gene expression of COL1A1 was significantly higher in group D than group B (P < 0.05), but difference was not significant between groups B and C, and between groups C and D (P > 0.05). The cells of group A all died at 6 days after culture; at 21 days, the calcium no dule staining was positive by alizarin red in groups B, C and D, and the degree of the staining gradually increased from groups B to D. Conclusion  BMSCs conditioned medium can alleviate the inhibitory effect of dexamethasone on osteoblasts function.

Citation: WEIBo, KANGYinhui, SONGLijun, WANGChaojun, GUOWeixiong, XIANGMin, LIGuangsheng, LINHao, ZENGRong. CONDITIONED MEDIUM OF BONE MARROW MESENCHYMAL STEM CELLS ALLEVIATE INHIBITING EFFECT OF DEXAMETHASONE ON OSTEOGENETIC CAPABILITY OF OSTEOBLAST. Chinese Journal of Reparative and Reconstructive Surgery, 2016, 30(6): 761-766. doi: 10.7507/1002-1892.20160155 Copy

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