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Electron microscopy of calcification during high-density suspension culture of chondrocytes

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Summary

Chondrocyte cultures grown in centrifuge tubes with intermittent centrifugation differentiate into hypertrophic chondrocytes and form calcification. We examined chondrocytes cultured in this system electron microscopically. Rat growth-plate chondrocytes were seeded in a plastic centrifuge tube and cultured in the presence of Eagle's minimum essential medium supplemented with 10% fetal bovine serum and 50 μg of ascorbic acid per ml. Specimens were examined by using electron microscopy and selected-area electron-diffraction techniques. In the early stage of culture, a few chondrocytes were scattered and extracellular matrices were not observed. In the middle stage of the cultures, the chondrocytes resembled proliferative cells. Matrix vesicles appeared to be budding from the cell surfaces of chondrocytes and were observed sparsely in the extracellular matrices, which were well formed around the chondrocytes. Matrix vesicles increased substantially during the following cultures. In the mature stage of the cultures, crystal formation related to matrix vesicles was observed. In the 33-day cultures, several masses of calcified matrix were formed and it was confirmed to be apatite by selected-area electron diffraction analysis. The chondrocytes appeared hypertrophic during this same stage. The 56-day culture was similar to the 33-day culture. It was concluded that this culture system provides an extracellular-matrix mineralization which is produced by chondrocytes per se.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, Faculty of Medicine, Kyoto University, 54 Shogoin Kawara-cho, 606, Sakyo-ku, Kyoto, Japan

    Yasuaki Nakagawa, Katsuji Shimizu, Takashi Hamamoto, Seiya Kotani & Takao Yamamuro

Authors
  1. Yasuaki Nakagawa
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  2. Katsuji Shimizu
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  3. Takashi Hamamoto
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  4. Seiya Kotani
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  5. Takao Yamamuro
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Nakagawa, Y., Shimizu, K., Hamamoto, T. et al. Electron microscopy of calcification during high-density suspension culture of chondrocytes. Calcif Tissue Int 53, 127–134 (1993). https://doi.org/10.1007/BF01321891

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  • DOI: https://doi.org/10.1007/BF01321891

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