Cited by 80Retinoids in leukemia and cellular processesCholesterol and Lipid MetabolismLipid metabolism and biosynthesis

Vitamin A status regulates hepatic lecithin: retinol acyltransferase activity in rats.

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Randolph, R.K., Ross, A.C.·1991·Journal of Biological Chemistry

Abstract

The activity of lecithin:retinol acyltransferase (LRAT) was determined in microsomes from the liver and small intestine of rats with differing vitamin A status. In animals depleted of retinol, as judged by undetectable liver vitamin A stores and low plasma retinol concentrations, hepatic LRAT activity was almost undetectable, whether assayed with retinol bound to cellular retinol-binding protein or solvent-dispersed retinol. In contrast, neither the activity of intestinal LRAT nor that of acyl-CoA:retinol acyltransferase in either liver or intestine differed from that of vitamin A-adequate rats. During the course of vitamin A depletion, liver LRAT activity fell progressively, nearly in parallel to the decrease in plasma retinol concentration. Oral repletion of vitamin A-depleted rats with 0.8 mg of retinol resulted in a very rapid restoration of plasma retinol concentration and full recovery of hepatic LRAT activity within 24 h, together with deposition of retinyl ester in the liver. These data strongly implicate LRAT activity in liver as responsible for the storage of hepatic retinyl esters. Retention of the intestine's capacity to esterify retinol during vitamin A deficiency provides a mechanism for capture of dietary vitamin A, while reduced hepatic LRAT activity may function to redirect retinol in liver from storage to other metabolic pathways.

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Crossref · 10.1016/s0021-9258(18)55321-7

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29 of 29 references verified0 citation errors · 0 not checkable

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  • 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.”
  • 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].”

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Authors
Randolph, R. K., & Ross, A. C.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1991-09
Volume
266
Issue
25
Pages
16453-16457
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1530752532
Cited by
80
References
29
Citations by year
2024: 1 · 2022: 3 · 2020: 1 · 2017: 1 · 2016: 4 · 2015: 1 · 2013: 2
FWCI
1.98
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r01hd016484-09)
  • National Heart, Lung, and Blood Institute (P01-HL22633, P01HL022633)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01 DK-41479)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (R-01 HD-16484)
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, vitamin A status, vitamin A deficiency, retinol esterification, retinol-binding protein, plasma retinol, liver microsomes, small intestine
MeSH terms
Acyltransferases, Animals, Intestines, Kinetics, Liver, Male, Microsomes, Liver, Organ Specificity, Rats, Inbred F344, Vitamin A, Retinol O-Fatty-Acyltransferase, Rats

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