Effects of expansive force on the differentiation of midpalatal suture cartilage in rats

Ichiro Takahashi, I. Mizoguchi, M. Nakamura, Y. Sasano, S. Saitoh, M. Kagayama, H. Mitani

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In an attempt to clarify the effects of biomechanical tensional force on chondrogenic and osteogenic differentiation of secondary cartilage, the midpalatal sutures of 4-week-old Wistar male rats were expanded by orthodontic wires which applied 20 g force for 4, 7, 10, and 14 days. The differentiation pathways in the midpalatal suture cartilage were examined by immunohistochemistry for osteocalcin, type I and type II collagen, and von Kossa histochemistry. Although the midpalatal sutures of the control animals consisted mainly of two separate secondary cartilages with mesenchyme-like cells at their midlines, type I collagen-rich fibrous tissue began to appear at day 4 and increased at the midline of the cartilage with days of experiment. At the end of the experiment, type I collagen-rich and calcified bone matrix appeared at the boundary between the precartilaginous and the cartilaginous cell layers. Most of the cartilaginous tissues were separated from each other and the midpalatal suture was replaced by osteocalcin-positive intramembranous bone and fibrous sutural tissue. These results strongly suggest that tensional force changed the phenotypic expression of collagenous components in secondary cartilage, which may reflect the differentiation pathway of osteochondro progenitor cells.

元の言語英語
ページ(範囲)341-348
ページ数8
ジャーナルBone
18
発行部数4
DOI
出版物ステータス出版済み - 1 1 1996
外部発表Yes

All Science Journal Classification (ASJC) codes

  • Endocrinology, Diabetes and Metabolism
  • Physiology
  • Histology

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    Takahashi, I., Mizoguchi, I., Nakamura, M., Sasano, Y., Saitoh, S., Kagayama, M., & Mitani, H. (1996). Effects of expansive force on the differentiation of midpalatal suture cartilage in rats. Bone, 18(4), 341-348. https://doi.org/10.1016/8756-3282(96)00012-9