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Vitamin D sclerosis in rats.

A Kamio, T Taguchi, M Shiraishi

    Acta Pathologica Japonica
    |July 1, 1979
    PubMed
    Summary
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    Excess vitamin D3 causes arterial changes and calcification in rats, accelerating atherosclerosis when combined with specific dietary factors. Smooth muscle cell activity, not just hypercalcemia, promotes mineralization.

    Area of Science:

    • Vascular Biology
    • Toxicology
    • Nutritional Science

    Background:

    • Excessive vitamin D3 intake can lead to arterial pathology.
    • Understanding the ultrastructural changes in arteries due to vitamin D toxicity is crucial for cardiovascular health.
    • The role of diet in modulating vitamin D-induced vascular damage requires further investigation.

    Purpose of the Study:

    • To investigate the early fine structural changes in rat arteries induced by excess vitamin D3.
    • To examine the effects of dietary factors (cholesterol, cholic acid, thiouracil) on vitamin D-induced vascular injury.
    • To elucidate the mechanisms of calcification in vitamin D-induced arterial sclerosis.

    Main Methods:

    • Administration of excess vitamin D3 (peroral and parenteral) to rats.

    Related Experiment Videos

  • Histological and ultrastructural examination of arterial tissues.
  • Dietary supplementation with cholesterol, cholic acid, and thiouracil.

    • Main Results:

    • Early fine structural changes were similar for peroral and parenteral vitamin D3, with parenteral administration showing greater vascular toxicity.
    • Calcification involved increased ground substance, collagen and elastic fibril separation, and smooth muscle cell degeneration.
    • Atherosclerosis was accelerated by dietary additions at sites of vascular injury.
    • Calcification occurred near elastic fibrils and degenerated cells, with limited deposition in the thickened coronary intima.
    • Smooth muscle cell activity, rather than hypercalcemia, appeared to promote mineralization.
    • Intimal thickening persisted even after vitamin D3 withdrawal.

    Conclusions:

    • Excess vitamin D3 induces significant ultrastructural arterial changes and calcification in rats.
    • Dietary factors can exacerbate vitamin D-induced vascular injury and accelerate atherosclerosis.
    • Smooth muscle cell function plays a key role in the mineralization process.
    • Vitamin D-induced arterial sclerosis does not prevent subsequent intimal thickening.