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Related Experiment Videos

Structure function analysis of vitamin D analogs with C-ring modifications.

R Bouillon1, K Allewaert, J P van Leeuwen

  • 1Laboratorium voor Experimentele Geneeskunde en Endocrinologie, Katholieke Universiteit Leuven, Gasthuisberg, Belgium.

The Journal of Biological Chemistry
|February 15, 1992
PubMed
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Modifying vitamin D analogs at the C-11 position impacts their interaction with the vitamin D receptor and binding protein. Some analogs show potent cell differentiation effects, exceeding their calcium metabolism activity.

Area of Science:

  • Endocrinology
  • Medicinal Chemistry
  • Molecular Biology

Background:

  • 1 alpha,25-dihydroxyvitamin D3 (1 alpha,25-(OH)2D3) is the active form of vitamin D, regulating calcium homeostasis and cell proliferation.
  • Vitamin D analogs are explored for therapeutic potential in various diseases, including cancer and bone disorders.
  • Understanding structure-activity relationships is crucial for designing effective vitamin D analogs.

Purpose of the Study:

  • To synthesize and characterize novel analogs of 1 alpha,25-(OH)2D3 with substitutions at the C-11 position.
  • To evaluate the impact of these substitutions on the binding affinity to the vitamin D receptor (VDR) and vitamin D-binding protein (VDBP).
  • To assess the biological activity of these analogs in terms of cell proliferation, differentiation, bone resorption, and calcium metabolism.

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Main Methods:

  • Chemical synthesis of C-11 substituted 1 alpha,25-(OH)2D3 analogs.
  • In vitro assays to measure binding affinity to VDR and VDBP.
  • In vitro studies on cell proliferation and differentiation using HL-60 cells.
  • In vitro assays for bone resorption.
  • In vivo studies on calcium metabolism in rachitic chicks.

Main Results:

  • Small, apolar C-11 substitutions (e.g., 11 alpha-methyl) minimally affected VDR affinity but increased VDBP affinity.
  • Larger or polar C-11 substitutions significantly reduced VDR affinity while increasing VDBP affinity.
  • The 11 alpha-methyl analog exhibited biological activity similar to 1 alpha,25-(OH)2D3 in cell proliferation and bone resorption.
  • In vivo, the 11 alpha-methyl analog showed about 50% of the calcemic effect of 1 alpha,25-(OH)2D3.
  • Several C-11 analogs demonstrated potent HL-60 cell differentiation effects, surpassing their calcemic activity.

Conclusions:

  • C-11 substitutions on 1 alpha,25-(OH)2D3 analogs modulate VDR and VDBP binding affinities.
  • Specific C-11 substitutions can lead to analogs with potent differentiating activity on leukemia cells, with potentially reduced calcemic side effects.
  • These findings highlight the potential of C-11 modified vitamin D analogs for targeted therapeutic applications.