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Chronic hypervitaminosis D3 determines a decrease in C-cell numbers and calcitonin levels in rats

I Martín-Lacave1, F Ramos, J C Utrilla

  • 1Department of Cellular Biology, University of Seville, Spain.

Journal of Endocrinological Investigation
|May 19, 1998
PubMed
Summary
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Vitamin D3 overdose in rats did not cause C cell growth, contrary to previous beliefs. Instead, hypercalcemia induced by vitamin D3 led to a decrease in C cell numbers, challenging existing research on C cell response to high calcium levels.

Area of Science:

  • Endocrinology
  • Cell Biology
  • Toxicology

Background:

  • Chronic hypercalcemia from vitamin D, calcium, or parathormone historically linked to C cell hypertrophy and hyperplasia.
  • Emerging evidence suggests a more complex relationship between elevated calcium/1,25(OH)2D3 and calcitonin production.
  • The response of C cells to hypercalcemia requires further investigation.

Purpose of the Study:

  • To investigate the effect of vitamin D3-induced hypercalcemia on rat C cells.
  • To assess changes in C cell number, serum calcium, and calcitonin levels.
  • To evaluate the ultrastructural characteristics of C cells under hypercalcemic conditions.

Main Methods:

  • Male Wistar rats received chronic vitamin D3 administration (50,000 IU/100 ml) with or without CaCl2.

Related Experiment Videos

  • Serum calcium and calcitonin levels were measured.
  • C cells were identified via immunohistochemistry (calcitonin, NSE) and quantified using morphometric analysis; ultrastructural studies were performed.

    • Main Results:

    • Vitamin D3 overdose did not induce C cell proliferation; a decrease in C cell percentage was observed after 1 month (1.55% vs. 2.43% in controls).
    • Combined vitamin D3 and CaCl2 treatment for 3 months also resulted in a reduced C cell percentage (2.27% vs. 3.62% in controls).
    • No significant alterations in serum calcitonin levels were detected throughout the experimental period.

    Conclusions:

    • Rat C cells do not exhibit hypertrophic or hyperplastic responses to hypercalcemia induced by vitamin D3 intoxication.
    • The findings contradict previous reports suggesting C cell proliferation under chronic hypercalcemia.
    • Vitamin D3-induced hypercalcemia may lead to a reduction in C cell numbers rather than hyperplasia.