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• W2036702743 endingPage "227" @default.
• W2036702743 startingPage "220" @default.
• W2036702743 abstract "The microsomal enzyme LRAT esterifies retinol and has been implicated in the hepatic storage of vitamin A. Previously, we showed that hepatic LRAT activity is negligible during vitamin A deficiency and that all-trans-retinoic acid (all-trans-RA) rapidly induces the activity of liver LRAT in retinoid-deficient rats. In the present studies, we have examined the ability of natural and synthetic retinoids to induce liver LRAT activity in retinoid-deficient rats. The natural retinoids retinol, all-trans-RA (100 μg), 9-cis-RA, or equal molar amounts of other retinoids were injected ip and LRAT specific activity was measured in liver homogenates 17–18 h later. In retinoid-deficient rats, liver LRAT activity was extremely low [0.13 ± 0.03 pmol retinyl ester (RE)/min/mg liver protein, mean ± SE]. The natural retinoids retinol and all-trans-RA strongly induced LRAT activity (12.71 ± 1.09 and 13.10 ± 1.55 pmol RE/min/mg, respectively), whereas 9-cis-RA induced a lower level of LRAT activity (3.96 ± 1.88 pmol RE/min/mg,P< 0.001 vs all-trans-RA). The retinoic acid receptor (RAR)-selective analog (RAR pan-agonist) all-trans-UAB8 and the RAR-α-selective retinoid Am580 also strongly induced LRAT activity. In contrast, neither RXR-selective agonists nor retinoids having aretrostructure were active. For retinoids with significant RAR-α binding activity there was a strong direct correlation between receptor bindingin vitroand the ability to induce hepatic LRAT activityin vivo(r2= 0.920). These data implicate the RARs in the induction of hepatic LRAT and suggest a predominant role for RAR-α-active ligands." @default.
• W2036702743 created "2016-06-24" @default.
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• W2036702743 date "1997-08-01" @default.
• W2036702743 modified "2023-10-04" @default.
• W2036702743 title "Regulation of Hepatic Lecithin:Retinol Acyltransferase Activity by Retinoic Acid Receptor-Selective Retinoids" @default.
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• W2036702743 doi "https://doi.org/10.1006/abbi.1997.0209" @default.
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