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Journal of Dental Research
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Failure of PTH, Calcitonin, or Vitamin D Metabolites to Influence Calcium Transport in the Maturation Stage Enamel Organ

J.W. Bawden

The Dental Research Center and The Department of Pedodontics. University of North Carolina, Chapel Hill, North Carolina 27514

T.G. Deaton

The Dental Research Center and The Department of Pedodontics. University of North Carolina, Chapel Hill, North Carolina 27514

D.A. Timko

The Dental Research Center and The Department of Pedodontics. University of North Carolina, Chapel Hill, North Carolina 27514

M.A. Crenshaw

The Dental Research Center and The Department of Pedodontics. University of North Carolina, Chapel Hill, North Carolina 27514

Eleven-day-old rat maxillary first molar explants were removed by microdissection and incubated in vitro to determine the direct effects of parathyroid hormone (PTH), calcitonin (CT), 1,25(OH)2D3, 24.25(OH) 2D3, and a combination of PTH and vitamin D 3 metabolites on calcium uptake in the mineralizing enamel of the explants. None of the agents had a statistically significant effect. These results are in contrast to those observed on explants from six-day-old rats, where PTH + 24,25(OH)2D3 caused a significant increase in net calcium transport. The findings are consistent with the hypothesis that the transcellular transport of calcium through the secretory stage and the maturation stage ameloblasts occurs by different mechanisms.

Journal of Dental Research, Vol. 64, No. 9, 1138-1140 (1985)
DOI: 10.1177/00220345850640090801
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Y. Sakakura, N. Fujiwara, M. Sugawara, and T. Nawa
In vitro Effects of Calcitonin and/or Parathyroid Hormone on Odontogenesis of Mouse Embryonic Molars
Journal of Dental Research, August 1, 1989; 68(8): 1279 - 1284.
[Abstract] [PDF]