Abstract
Thyroid hormone is important for skull bone growth, which primarily occurs at the cranial sutures and synchondroses. Thyroid hormones regulate metabolism and act in all stages of cartilage and bone development and maintenance by interacting with growth hormone and regulating insulin-like growth factor. Aberrant thyroid hormone levels and exposure during development are exogenous factors that may exacerbate susceptibility to craniofacial abnormalities potentially through changes in growth at the synchondroses of the cranial base. To elucidate the direct effect of in utero therapeutic thyroxine exposure on the synchondroses in developing mice, we provided scaled doses of the thyroid replacement drug, levothyroxine, in drinking water to pregnant C57BL6 wild-type dams. The skulls of resulting pups were subjected to micro-computed tomography analysis revealing less bone volume relative to tissue volume in the synchondroses of mouse pups exposed in utero to levothyroxine. Histological assessment of the cranial base area indicated more active synchondroses as measured by metabolic factors including Igf1. The cranial base of the pups exposed to high levels of levothyroxine also contained more collagen fiber matrix and an increase in markers of bone formation. Such changes due to exposure to exogenous thyroid hormone may drive overall morphological changes. Thus, excess thyroid hormone exposure to the fetus during pregnancy may lead to altered craniofacial growth and increased risk of anomalies in offspring.
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Acknowledgements
The authors would like to thank the following funding sources: National Institutes of Health, National Institute of Dental and Craniofacial Research (R03DE023350A to JJC), and Cleft Palate Foundation Cleft/Craniofacial Anomalies Grant Award to JJC. Micro-Computed Tomography scans were made possible by the Nation Institute on Aging (NIA) (1P01AG036675 to ME). ELD and RNH were funded through a National Institutes of Health National Institute of Dental and Craniofacial Research training Grant (5T32DE017551). This study utilized the facilities and resources of the Medical University of South Carolina Center for Oral Health Research supported by the NIH/NIGM (P30GM103331).
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Emily Durham, R. Nicole Howie, Trish Parsons, Gracie Bennfors, Laurel Black, Seth M. Weinberg, Mohammed Elsalanty, Jack C Yu, and James J. Cray Jr. declare no competing financial interests.
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All procedures and the reporting thereof are in compliance with the Animal Research: Reporting in Vivo Experiments (ARRIVE) guidelines.
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Durham, E., Howie, R.N., Parsons, T. et al. Thyroxine Exposure Effects on the Cranial Base. Calcif Tissue Int 101, 300–311 (2017). https://doi.org/10.1007/s00223-017-0278-z
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DOI: https://doi.org/10.1007/s00223-017-0278-z