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[Features of cholecalciferol hydroxylation in the liver of rats in conditions of D-hypervitaminosis and activity of alpha-tocopherol].

Abstract
It is shown, that hepatocytes contain two (microsomal and mitochondrial) vitamin D3 25-hydroxylase enzymes, which differ as to their activity and function with maximal activity at different concentrations to substrate, namely at 15 microM and 100 microM of vitamin D3, accordingly. Activity of vitamin D3 25-hydroxylase enzymes of hepatocytes is regulated by cholecalciferol and alpha-tocopherol. The general and microsomal vitamin D3 25-hydroxylase enzymes activity of hepatocytes is lowered, but mitochondrial isoform is increased under D-hypervitaminosis conditions. Vitamin E increases microsomal vitamin D3 25-hydroxylase activity and decreases mitochondrial isoform activity of rats hepatocytes under D-hypervitaminosis conditions. It is established that D-hypervitaminosis is accompanied by expressed hypercalcemia and hyperphosphatemia, by decreased contents of mineral components in the bone tissue and high activity of alkaline phosphatase in the blood serum. The physiological doses of vitamin E under these conditions normalized the mineral metabolism, contents of calcium, phosphates and activity of alkaline phosphatase isoform in the blood serum.
AuthorsM M Velykyĭ, L I Apukhovs'ka, V M Vasylevs'ka, O Iu Lotots'ka, A I Besusiak, A V Khomenko
JournalUkrains'kyi biokhimichnyi zhurnal (1999 ) (Ukr Biokhim Zh (1999)) 2010 Mar-Apr Vol. 82 Issue 2 Pg. 67-74 Ukraine
PMID20684247 (Publication Type: Journal Article)
Chemical References
  • Phosphates
  • Cholecalciferol
  • Cholestanetriol 26-Monooxygenase
  • alpha-Tocopherol
  • Calcium
Topics
  • Animals
  • Bone Density (drug effects)
  • Calcium (blood, metabolism)
  • Cells, Cultured
  • Cholecalciferol (administration & dosage, blood, metabolism)
  • Cholestanetriol 26-Monooxygenase (blood, metabolism)
  • Hepatocytes (drug effects, enzymology, metabolism)
  • Hydroxylation
  • Liver (drug effects, enzymology, metabolism)
  • Microsomes, Liver (drug effects, enzymology, metabolism)
  • Mitochondria, Liver (drug effects, enzymology, metabolism)
  • Phosphates (blood, metabolism)
  • Rats
  • alpha-Tocopherol (pharmacology)

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