Formation of retinoic acid from retinol in the rat

Abstract
The formation in vivo of retinoic acid from microgram quantities of intrajugularly administered [15-C14]retinol was demonstrated in the rat. Endogenously formed retinoic acid (about 0. 1 [mu]g./ rat) was found in liver, and to a much smaller extent in intestine, 12 hr. after retinol administration. Excretion of some of the endogenously formed retinoic acid occurred in the bile of bile-duct-cannulated rats. Excretion of unaltered retinoic acid in the urine of intact rats did not occur even after the intrajugular administration of preformed retinoic acid.

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