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Effects of Strontium on Collagen Content and Expression of Related Genes in Rat Chondrocytes Cultured In Vitro

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Abstract

Strontium stimulates cartilage matrix formation in vitro. However, the mechanisms governing these effects have not yet been extensively reported. In this study, chondrocytes were isolated from rat articular cartilage by enzymatic digestion and cultured for 24–72 h with 1–5 mM strontium. We investigated the effects of different concentrations of strontium on collagen content, type II collagen, insulin-like growth factor (IGF-1) and matrix metalloproteinase (MMP)-13 expression in rat cultured articular chondrocytes in vitro. The collagen content of the chondrocytes, determined as hydroxyproline, was measured by a colorimetry method. Type II collagen, IGF-1, and MMP-13 mRNA abundance and protein expression levels were determined by real-time polymerase chain reaction (real-time PCR) and western blot, respectively. The results showed that collagen content from the chondrocytes extracellular matrix increased with increasing strontium concentration. Moreover, 3 and 5 mM strontium strongly stimulated protein expression and mRNA levels of type II collagen and IGF-1. Conversely, MMP-13 expression in chondrocytes decreased dose-dependently with increasing strontium concentration. These results should provide insight into the ability of strontium to promote chondrocyte extracellular matrix synthesis. Strontium could promote collagen synthesis and suppress collagen degradation via the repression of MMP-13 expression.

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Acknowledgments

This work was supported by the Program for New Century Excellent Talents in University (NCET-11-0199), the Joint Funds of the NSFC-Yunnan province (U0836601), the National Key Technology R&D Program (Grant No. 2012BAD12B03), the National Natural Science Foundation of China (Grant Nos. 30600441, 30972212, 30871897 and 31072178) and the Science Fund for Distinguished Young Scholars of Jilin University (Grant No. 201100009).

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Authors and Affiliations

  1. College of Animal Science and Veterinary Medicine, Jilin University, Changchun, 130062, China

    Jianguo Wang, Xiaoyan Zhu, Lei Liu, Xiaoxia Shi, Liheng Yin, Yuming Zhang, Xiaobing Li, Zhe Wang & Guowen Liu

  2. Department of Food Science, Cornell University, Ithaca, NY, 14853, USA

    Lei Liu

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  1. Jianguo Wang
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  2. Xiaoyan Zhu
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  3. Lei Liu
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  4. Xiaoxia Shi
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  5. Liheng Yin
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  6. Yuming Zhang
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Correspondence to Zhe Wang or Guowen Liu.

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Wang, J., Zhu, X., Liu, L. et al. Effects of Strontium on Collagen Content and Expression of Related Genes in Rat Chondrocytes Cultured In Vitro . Biol Trace Elem Res 153, 212–219 (2013). https://doi.org/10.1007/s12011-013-9640-9

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  • DOI: https://doi.org/10.1007/s12011-013-9640-9

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