Cited by 75Retinoids in leukemia and cellular processesCholesterol and Lipid MetabolismLipid metabolism and biosynthesis

Regulation of Hepatic Lecithin: Retinol Acyltransferase Activity by Retinoic Acid

Matsuura, T., Ross, A.C.·1993·Archives of Biochemistry and Biophysics

Abstract

The activity of the hepatic enzyme lecithin: retinol acyltransferase (LRAT), thought to catalyze the esterification of retinol for storage, was previously shown to vary directly with the vitamin A (retinol) status of the rat [Randolph, R. K., and Ross, A. C. (1991) J. Biol. Chem. 266, 16453-16457]. The present studies were designed to determine whether liver LRAT activity is regulated in vivo by retinoic acid, a principal active metabolite of retinol. LRAT activity was negligible in the livers of vitamin A-deficient rats. Following treatment with a single 2-micrograms dose of retinoic acid, LRAT activity increased significantly while, following treatment with a single 20-micrograms dose, liver LRAT activity equalled that of vitamin A-sufficient adult rats. Retinoic acid was more effective than an equimolar quantity of retinol in restoring LRAT activity in the vitamin A-deficient rat liver. The increase in hepatic LRAT activity after administration of retinoic acid occurred rapidly, reaching a maximum within 12-16 h but declining again after 48-72 h. Studies were conducted in vivo to gain insight into the level of regulation of LRAT by retinoic acid. The increase in LRAT activity by retinoic acid in the vitamin A-deficient rat was blocked completely by both actinomycin D and cycloheximide. The ability of liver to esterify retinol in vivo was correlated with the in vitro activity of LRAT after retinoic acid induction. We conclude that retinoic acid, an important end product of retinol metabolism, regulates a key aspect of hepatic retinol metabolism through its regulatory activity on liver LRAT.

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Crossref · 10.1006/abbi.1993.1137

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  • LRAT activity could be induced by retinoic acid or supplemental vitamin A.

    “Interestingly, LRAT activity could be induced by retinoic acid or supplemental vitamin A [117,118].”
  • LRAT activity was much lower in the liver of vitamin A deficient rats compared to control animals.

    “The initial studies by Dr. Ross and colleagues indicated that LRAT activity was much lower in the liver of vitamin A deficient rats as compared to the control animals.”

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Authors
Matsuura, T., & Ross, A. C.
Venue
Archives of Biochemistry and Biophysics
Publisher
Elsevier BV
Published
1993-03
Volume
301
Issue
2
Pages
221-227
ISSN
0003-9861 (ISSN-L)
OpenAlex
W2011930381
Cited by
74
References
0
Citations by year
2022: 2 · 2021: 1 · 2017: 1 · 2016: 2 · 2015: 4 · 2014: 1 · 2013: 3 · 2012: 1
FWCI
1.55
Type
journal article
Language
en
Open access
closed
Locations
  • Archives of Biochemistry and Biophysics (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Heart, Lung, and Blood Institute (HL22633, P01HL022633)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (HD-14684)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinoids in leukemia and cellular processes
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Lipid metabolism and biosynthesis
Keywords
LRAT, retinoic acid, retinol esterification, vitamin A deficiency, hepatic enzyme regulation, vitamin A metabolism, actinomycin D, cycloheximide
MeSH terms
Acyltransferases, Animals, Cycloheximide, Dactinomycin, Dose-Response Relationship, Drug, Enzyme Induction, Esterification, Female, Liver, Male, Microsomes, Liver, Phosphatidylcholines, Rats, Inbred Lew, Transcription, Genetic, Protein Biosynthesis, Tretinoin, Vitamin A, Vitamin A Deficiency, Rats

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