Cell and Tissue Research

, Volume 245, Issue 1, pp 9–17

Phagocytosis of different matrix components by different cell types at bone-forming sites in cultured mouse calvariae

Authors

  • Tsuneo Takahashi
    • Department of Oral AnatomyKanagawa Dental College
  • Seigyo So
    • Department of Oral AnatomyKanagawa Dental College
  • Duenjeng Wang
    • Department of Oral AnatomyKanagawa Dental College
  • Kazuto Takahashi
    • Department of Oral AnatomyKanagawa Dental College
  • Noriyoshi Kurihara
    • Department of Oral AnatomyJosai Dental University
  • Masayoshi Kumegawa
    • Department of Oral AnatomyJosai Dental University
Article

DOI: 10.1007/BF00218081

Cite this article as:
Takahashi, T., So, S., Wang, D. et al. Cell Tissue Res. (1986) 245: 9. doi:10.1007/BF00218081

Summary

Sites of bone formation on fragments of parietal bone of fetal-mice cultured for 10 days were examined by electron microscopy after addition of either ruthenium red or ferrocyanide to the postfixation fluid. Osteoclasts, osteoblast-like cells, and macrophages were the principal active cells at these formation sites. The mononuclear cells (osteoblast-like cells and macrophages) in the osteoid tissue showed evidence of having incorporated elements of calcified tissue. Osteoblast-like cells had phagocytized collagen fibrils and calcified bone matrix. This occurred more frequently in the calcifying area. Mononuclear macrophages showed not only phagocytosis and digestion of cellular debris and bone spicules in the osteoid, but also active incorporation of calcified bone matrix that had been detached from its surroundings by its pseudopod-like projections from long cytoplasmic processes. Collagen fibrils were seldom observed within the macrophages. These observations suggest that in our culture system osteoblast-like cells and macrophages at bone formation sites have a phagocytic role in bone remodeling.

Key words

CalvariaMacrophageOsteoblast-like cellBone formationOsteoidMouse

Copyright information

© Springer-Verlag 1986