Publication Type |
Journal Article |
School or College |
School of Medicine |
Department |
Ophthalmology |
Creator |
Baehr, Wolfgang |
Other Author |
O'Byrne, Sheila M; Wongsiriroj, Nuttaporn; Libien, Jenny; Vogel, Silke; Goldberg, Ira J; Palczewski, Krzysztof; Blaner, William S |
Title |
Retinoid absorption and storage is impaired in mice lacking lecithin:retinol acyltransferase (LRAT) |
Date |
2005 |
Description |
Lecithin:retinol acyltransferase (LRAT) is believed to be the predominant if not the sole enzyme in the body responsible for the physiologic esterification of retinol. We have studied Lrat-deficient (Lrat-/-) mice to gain a better understanding of how these mice take up and store dietary retinoids and to determine whether other enzymes may be responsible for retinol esterification in the body. Although the Lrat-/- mice possess only trace amounts of retinyl esters in liver, lung, and kidney, they possess elevated (by 2-3-fold) concentrations of retinyl esters in adipose tissue compared with wild type mice. These adipose retinyl ester depots are mobilized in times of dietary retinoid insufficiency. We further observed an up-regulation (3-4-fold) in the level of cytosolic retinol-binding protein type III (CRBPIII) in adipose tissue of Lrat-/- mice. Examination by electron microscopy reveals a striking total absence of large lipid-containing droplets that normally store hepatic retinoid within the hepatic stellate cells of Lrat-/- mice. Despite the absence of significant retinyl ester stores and stellate cell lipid droplets, the livers of Lrat-/- mice upon histologic analysis appear normal and show no histological signs of liver fibrosis. Lrat-/- mice absorb dietary retinol primarily as free retinol in chylomicrons; however, retinyl esters are also present within the chylomicron fraction obtained from Lrat-/- mice. The fatty acyl composition of these (chylomicron) retinyl esters suggests that they are synthesized via an acyl-CoA-dependent process suggesting the existence of a physiologically significant acyl-CoA:retinol acyltransferase. |
Type |
Text |
Publisher |
American Society for Biochemistry and Molecular Biology (ASBMB) |
Volume |
280 |
Issue |
42 |
First Page |
35647 |
Last Page |
35657 |
Subject |
Chromatography, High Pressure Liquid; Mice, Transgenic; Tissue Distribution |
Subject MESH |
Acyltransferases; Tretinoin |
Language |
eng |
Bibliographic Citation |
O'Byrne SM, Wongsiriroj N, Libien J, Vogel S, Goldberg IJ, Baehr W, Palczewski K, Blaner WS. (2005). Retinoid absorption and storage is impaired in mice lacking lecithin:retinol acyltransferase (LRAT). J Biol Chem, 280(42), 35647-57 |
Rights Management |
(c)American Society for Biochemistry and Molecular Biology (ASBMB) |
Format Medium |
application/pdf |
Identifier |
ir-main,1744 |
ARK |
ark:/87278/s6fn1qx8 |
Setname |
ir_uspace |
ID |
707529 |
Reference URL |
https://collections.lib.utah.edu/ark:/87278/s6fn1qx8 |