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• W2024401375 abstract "Earlier studies with etretinate and its metabolite acitretin suggested that area under the concentration–time curve (AUC) is the most suitable pharmacokinetic correlate to etretinate-induced teratogenesis. In an attempt to test this hypothesis with respect to the embryotoxic effects of all-trans-retinoic acid (all-trans-RA), we determined the embryotoxicity and plasma pharmacokinetics of all-trans-RA and its metabolites following administration of all-trans-RA to Wistar rats on Gestational Day (GD) 9, either subcutaneously (sc; dose levels 1, 3, or 5 mg/kg body mass) or orally (po; 5 mg/kg body mass). The 5 mg/kg dose of all-trans-RA was not embryotoxic when administered orally but led to high rates of embryolethality and skeletal defects following sc treatment. Determination of retinoids by HPLC showed that all-trans-RA reached similar maximum plasma concentrations (Cmax) after both dosing regimens, but its plasma AUC was ca. threefold higher after sc injection than po administration due to the slower uptake rate of the drug and its limited detoxification via β-glucuronidation following sc injection. Furthermore, retinoid analysis in rat tissues (liver, kidney, duodenum, and jejunum), collected 1 hr after sc or po administration of 5 mg all-trans-RA/kg body mass on GD 9, confirmed that formation of all-trans-retinoyl-β-glucuronide was much more extensive after po than after sc administration. Finally, linear regression analysis of eitherCmaxor AUC values of all-trans-RA in rat plasma and fetal abnormality rates showed that AUC values are better correlated with the embryotoxic outcome thanCmax[AUC-based correlation coefficient (r) > 0.90;Cmax-basedr< 0.43]. Our findings establish the relevance of the AUC of all-trans-RA, and not itsCmax, as the most appropriate pharmacokinetic marker of embryonic exposure and embryotoxic potency of all-trans-RA and stress the importance of the duration of exposure as a major determinant of embryotoxic outcome for retinoids." @default.
• W2024401375 created "2016-06-24" @default.
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• W2024401375 date "1997-04-01" @default.
• W2024401375 modified "2023-10-03" @default.
• W2024401375 title "The Area under the Concentration–Time Curve of All-trans-Retinoic Acid Is the Most Suitable Pharmacokinetic Correlate to the Embryotoxicity of This Retinoid in the Rat" @default.
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• W2024401375 doi "https://doi.org/10.1006/taap.1997.8105" @default.
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