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Related Experiment Videos

Decrease in calcitonin and parathyroid hormone mRNA levels and hormone secretion under long-term hypervitaminosis D3

J M Fernández-Santos1, J C Utrilla, E Conde

  • 1Department of Normal and Pathological Citology and Histology, School of Medicine, University of Seville, Spain.

Histology and Histopathology
|May 3, 2001
PubMed
Summary

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Long-term vitamin D3 administration does not stimulate calcitonin (CT) cells. Instead, it decreases CT and parathyroid hormone (PTH) production and C-cell numbers in rats.

Area of Science:

  • Endocrinology
  • Calcium Homeostasis
  • Vitamin D Metabolism

Background:

  • Vitamin D3 is a key regulator of calcium homeostasis, influencing calcitonin (CT) and parathyroid hormone (PTH) gene expression.
  • Hypervitaminosis D3 has been used to model C-cell hyperactivation and hyperplasia, assuming it stimulates CT production to lower calcium levels.

Purpose of the Study:

  • To investigate the actual effect of chronic vitamin D3 administration on C-cell activity and number.
  • To determine if vitamin D3-induced hypercalcemia can be used to induce proliferative lesions in C-cells.

Main Methods:

  • Wistar rats received chronic vitamin D3 (25,000 IU/d) with or without calcium chloride.
  • Serum levels of calcium, vitamin D3 metabolites, CT, and PTH were measured using RIA.
  • CT and PTH mRNA levels were analyzed by Northern blot and in situ hybridization.

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  • Ultrastructure of hormone-producing cells was examined via electron microscopy.

    • Main Results:

    • Chronic vitamin D3 administration led to decreased biosynthetic activity in both PTH and CT-producing cells.
    • Contrary to previous assumptions, CT serum levels did not increase, and C-cell proliferation was not observed; instead, C-cell numbers decreased.
    • The magnitude of the decrease in hormone biosynthesis differed between PTH and CT-producing cells.

    Conclusions:

    • Hypervitaminosis D3 does not stimulate C-cell activity or induce proliferative lesions.
    • The use of hypervitaminosis D3 models to study C-cell proliferation is not supported by these findings.
    • Vitamin D3, under chronic hypercalcemic conditions, appears to inhibit, rather than stimulate, C-cell function and potentially their proliferation.