Differences in the pharmacokinetic properties of orally administered all-trans-retinoic acid and 9-cis-retinoic acid in the plasma of nude mice
- PMID: 8070324
Differences in the pharmacokinetic properties of orally administered all-trans-retinoic acid and 9-cis-retinoic acid in the plasma of nude mice
Abstract
All trans-retinoic acid (tr-RA) has been used to induce leukemic cell differentiation in patients with acute promyelocytic leukemia (APL). However, the duration of remission is brief and is associated with a progressive decrease in peak plasma concentrations following chronic dosing. 9-Cis-retinoic acid (9-cis-RA) has the potential to elicit the same effects as tr-RA, because it can bind and activate the same family of nuclear receptors. It is not known whether the pharmacokinetics of this novel compound resemble those of tr-RA. In this study, we report major differences in the uptake and pharmacokinetics between orally administered tr-RA and 9-cis-RA in the plasma of nude mice. Following a single initial oral administration of either isomer, the plasma peak time of 9-cis-RA (15-30 min) occurred earlier than that of tr-RA (60-180 min), but with lower plasma concentrations and area under the concentration-time curve (AUC) value. A decrease in the AUC of plasma tr-RA was seen in animals that were given a second dose 2 days after the first dose. In contrast, an increase in the AUC of plasma 9-cis-RA was seen in animals that were given a second dose 2 days after the first dose. This increase was due to the appearance of a second 9-cis-RA peak at 180 min. When liarozole, an inhibitor of tr-RA metabolism, was coadministered with the initial tr-RA dose or a second tr-RA dose 2 weeks later, the AUC of plasma tr-RA was increased relative to tr-RA alone.(ABSTRACT TRUNCATED AT 250 WORDS)
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