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Thyroid hormone action on rat calvarial sutures

S Akita1, T Nakamura, A Hirano

  • 1Department of Plastic and Reconstructive Surgery, Nagasaki University School of Medicine, Japan.

Thyroid : Official Journal of the American Thyroid Association
|January 1, 1994
PubMed
Summary

Excess thyroid hormone (triiodothyronine) in young rats causes premature narrowing of skull sutures. This is due to increased bone formation and reduced bone resorption, affecting calvarial bone mineral density.

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Area of Science:

  • Endocrinology
  • Developmental biology
  • Craniofacial biology

Background:

  • Thyroid hormone plays a crucial role in mammalian growth and development.
  • Calvarial sutures are essential for skull growth and development.
  • The specific effects of thyroid hormone on calvarial suture development are not fully understood.

Purpose of the Study:

  • To investigate the impact of excess thyroid hormone on the morphology, histology, and bone mineral density of calvarial sutures in developing rats.

Main Methods:

  • Wistar rats were administered triiodothyronine (T3) or saline from postnatal day 10.
  • Skull morphology, suture width, and fibrous tissue content were analyzed at multiple time points.
  • Histology, fluorescent microscopy (tetracycline-calcein labeling), and bone mineral density (BMD) measurements were performed.

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Main Results:

  • T3-treated rats exhibited smaller skull dimensions and reduced sagittal suture width.
  • Histological analysis revealed increased osseous margin width and reduced fibrous tissue in sutures.
  • Mineral apposition rates were significantly increased, while osteoclastic activity appeared scant.
  • Calvarial BMD was decreased in T3-treated rats by 210 days, but lumbar and femur BMD were unaffected.

Conclusions:

  • Excess thyroid hormone accelerates calvarial suture fusion in infantile rats.
  • This effect is likely mediated by enhanced osteogenic activity and potentially altered bone remodeling.
  • Findings highlight the critical role of thyroid hormone in regulating craniofacial skeletal development.