The metabolism and organ distribution of 5,6-trans-25-hydroxycholecalciferol, an analog of vitamin D-3 in vitamin D-deficient rats.

Investigations have been performed on the metabolism and organ distribution of 5,6-trans-25(OD)D-3, which represents an analog of vitamin D-3 being active in uremia. This analog is rapidly metabolized into at least two more metabolites. The main storage organ for this compound seems to be fat, whereas liver and intestinal mucosa showed at 24 hrs the highest concentration of polar metabolites. In contrast to 25(OH)D-3 5,6-trans-25(OH)D-3 is much less absorbed from the intestinal tract, which should be considered if this compound is applied for treatment of uremic bone diseases.