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Related Experiment Videos

Physiological concentrations of 24,25-dihydroxyvitamin D3 rapidly decrease the in vitro intestinal calcium uptake in

D Larsson1, B T Björnsson, K Sundell

  • 1Department of Zoophysiology, Göteborg University, Sweden.

General and Comparative Endocrinology
|November 1, 1995
PubMed
Summary

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The vitamin D metabolite 24,25(OH)2D3 rapidly reduces intestinal calcium uptake in Atlantic cod. This contrasts with 1,25(OH)2D3, which has no effect, highlighting 24,25(OH)2D3

Area of Science:

  • Comparative physiology
  • Endocrinology
  • Marine biology

Background:

  • Vitamin D metabolites play crucial roles in calcium homeostasis.
  • 1,25(OH)2D3 is typically the most active metabolite in vertebrates.
  • The role of vitamin D in fish calcium regulation requires further investigation.

Purpose of the Study:

  • To investigate the effects of 1,25(OH)2D3 and 24,25(OH)2D3 on intestinal calcium (Ca2+) uptake in Atlantic cod (Gadus morhua).
  • To determine the relative importance of these vitamin D metabolites in short-term calcium regulation in this species.

Main Methods:

  • In vitro perfusion of Atlantic cod intestine, both vascularly and luminally.
  • Measurement of Ca2+ influx using the radioisotope 45Ca.
  • Administration of varying physiological concentrations of 1,25(OH)2D3 and 24,25(OH)2D3.

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Main Results:

  • 24,25(OH)2D3 significantly decreased intestinal Ca2+ influx in a dose-dependent manner (21-34% reduction).
  • 1,25(OH)2D3 had no significant effect on Ca2+ influx at the tested concentrations.
  • The effects of 24,25(OH)2D3 were rapid (10-25 min) and suggested a non-genomic mechanism.

Conclusions:

  • 24,25(OH)2D3 is a key regulator of rapid, short-term intestinal calcium uptake in Atlantic cod.
  • Unlike other vertebrates, 1,25(OH)2D3 does not appear to mediate transcaltachic effects in this species.
  • This study identifies 24,25(OH)2D3 as a more important metabolite for immediate calcium regulation in Atlantic cod.