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Related Concept Videos

  • Agricultural, Veterinary And Food Sciences
  • Veterinary Sciences
  • Veterinary Medicine (excl. Urology)
  • Impaired 24,25-dihydroxyvitamin D Production In Anephric Human And Pig
  • Agricultural, Veterinary And Food Sciences
  • Veterinary Sciences
  • Veterinary Medicine (excl. Urology)
  • Impaired 24,25-dihydroxyvitamin D Production In Anephric Human And Pig

    • Related Experiment Videos

    Impaired 24,25-dihydroxyvitamin D production in anephric human and pig

    R L Horst, E T Littledike, R W Gray

      The Journal of Clinical Investigation
      |January 1, 1981

      View abstract on PubMed

      Summary
      This summary is machine-generated.

      Anephric humans show minimal to no production of 24,25-dihydroxyvitamin D [24,25-(OH)(2)D] with normal vitamin D intake. Pigs, however, can produce this metabolite when plasma 25-hydroxyvitamin D levels are extremely high.

      Related Experiment Videos

      Area of Science:

      • Endocrinology
      • Nutritional Science
      • Biochemistry

      Background:

      • Vitamin D is crucial for calcium homeostasis and bone health.
      • 25-hydroxyvitamin D (25-OHD) is the main circulating form, while 24,25-dihydroxyvitamin D [24,25-(OH)(2)D] is a catabolite.
      • The role of 24,25-(OH)(2)D and its production in anephric individuals requires further investigation.

      Purpose of the Study:

      • To investigate the production of 24,25-dihydroxyvitamin D [24,25-(OH)(2)D] in anephric humans and pigs.
      • To compare vitamin D metabolite levels in anephric versus normal subjects.
      • To determine the threshold of 25-hydroxyvitamin D (25-OHD) required for 24,25-(OH)(2)D production in pigs.

      Main Methods:

      • Measurement of plasma 25-hydroxyvitamin D (25-OHD) and 24,25-dihydroxyvitamin D [24,25-(OH)(2)D] using HPLC.
      • Analysis of samples from chronically dialyzed anephric and normal humans and pigs.
      • Administration of high-dose vitamin D3 to pigs to induce varying levels of 25-OHD.

      Main Results:

      • Anephric humans had undetectable or very low levels of 24,25-(OH)(2)D, while normal humans had detectable levels.
      • Anephric pigs showed a decline in 24,25-(OH)(2)D initially, with levels only becoming apparent when 25-OHD exceeded 400 ng/ml.
      • Normal pigs demonstrated significant 24,25-(OH)(2)D production following vitamin D3 administration.

      Conclusions:

      • Anephric humans appear to have a limited capacity to produce 24,25-dihydroxyvitamin D [24,25-(OH)(2)D] under normal dietary conditions.
      • Pigs can synthesize 24,25-(OH)(2)D, but this process is dependent on extremely high circulating levels of 25-hydroxyvitamin D.
      • These findings highlight species-specific differences in vitamin D metabolism and the potential impact of kidney function on vitamin D metabolite profiles.