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Interrelation of cortisone and 1,25 dihydroxycholecalciferol on intestinal calcium and phosphate absorption

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Summary

The interrelation of glucocorticoids and 1,25 dihydroxycholecalciferol (1,25(OH)2D3) on intestinal calcium and phosphate absorption was investigated. The active and passive transport of calcium and phosphate was evaluated by thein situ intestinal loop technique. Administration of cortisone resulted in a decrease of the luminal fluid and an increase of the luminal calcium and phosphate concentration. Under active transport conditions, administration of cortisone resulted in a decrease of net calcium absorption through two mechanisms: (1) depressed vitamin D-dependent calcium absorption, (2) increased vitamin D-independent calcium backflux. The enhancement of bidirectional phosphate flux by cortisone was independent of 1,25(OH)2D3. An enhancement of water movement by cortisone resulted in an increase of luminal calcium and phosphate concentration which favors the passive diffusion of these ions. Enhanced calcium diffusion by cortisone compensates for the inhibitory effect of cortisone on vitamin D-dependent calcium transport. However, enhanced phosphate diffusion by cortisone is additive to the effect of 1,25(OH)2D3.

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Yeh, J.K., Aloia, J.F. & Semla, H.M. Interrelation of cortisone and 1,25 dihydroxycholecalciferol on intestinal calcium and phosphate absorption. Calcif Tissue Int 36, 608–614 (1984). https://doi.org/10.1007/BF02405375

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