Evaluation of the proliferation and differentiation behaviors of mesenchymal stem cells with partially converted borate glass containing different amounts of strontium in vitro

Zhu,Yi; Ouyang,Yuanming; Chang,Yi; Luo,Congfeng; Xu,Jun; Zhang,Changqing; Huang,Wenhai

doi:10.3892/mmr.2013.1341

Evaluation of the proliferation and differentiation behaviors of mesenchymal stem cells with partially converted borate glass containing different amounts of strontium in vitro

Authors:
- Yi Zhu
- Yuanming Ouyang
- Yi Chang
- Congfeng Luo
- Jun Xu
- Changqing Zhang
- Wenhai Huang
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Affiliations: Department of Orthopaedic Surgery, Shanghai Sixth People's Hospital, Shanghai Jiaotong University, Shanghai 200233, P.R. China, Department of Plastic Surgery, Shanghai Sixth People's Hospital, Shanghai Jiaotong University, Shanghai 200233, P.R. China, Institute of Bioengineering and Information Technology Materials, Tongji University, Shanghai 200092, P.R. China
Published online on: February 26, 2013 https://doi.org/10.3892/mmr.2013.1341
Pages: 1129-1136

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Abstract

The objective of this study was to examine the proliferation and differentiation behaviors of different compositions of strontium‑containing (from 0‑12 mol%) borate glasses with mesenchymal stem cells (MSCs). The Cell Counting Kit‑8 (CCK‑8) assay revealed that after three days of culturing, the 6Sr group had the highest cell growth rate. Analysis of cell morphology revealed that cells proliferated well near the particles of the samples in all the groups on day 3. On day 7, cells in the 6Sr group demonstrated a higher proliferation rate than other 4 groups under the microscope. When performing the Live‑Dead staining experiment, the 6Sr group had the least number of dead cells. Total DNA qualification indicated that the 6Sr group had a statistically higher concentration compared with the remaining groups. It was found that on day 7, compared with the 0Sr group, the core binding factor α1 (Cbfa1) mRNA expression level was significantly higher in the 6Sr, 9Sr and 12Sr groups. On day 14, compared with the 0Sr group, the bone sialoprotein (BSP) mRNA level was significantly higher in the 6Sr group. Additionally, on day 21, the 6Sr and 9Sr groups demonstrated higher osteocalcin (OCN) mRNA expression levels compared with the 0Sr group. In the alkaline phosphatase (ALP) activity test, on day 21, the 6Sr group presented a higher activity than the 0Sr group. Further, the number of mineralized nodules per unit in MSCs was measured by Alizarin Red S staining. The results showed that the 6Sr and 9Sr groups had the greatest number of mineralized nodules. Therefore, it could be concluded that borate glasses containing strontium oxide of 0, 3, 6, 9 and 12 mol% demonstrate a significant level of proliferation when interacting with MSCs. The borate glass containing 6 mol% strontium oxide had the greatest level of proliferation when cultured with MSCs. The borate glass containing 6 and 9 mol% strontium oxide facilitated an improved bone formation ability compared with the remaining two compositions.

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