Cited by 68Cholesterol and Lipid MetabolismFolate and B Vitamins ResearchAnimal Nutrition and Physiology

Effect of dietary methionine on plasma and liver cholesterol concentrations in rats and expression of hepatic genes involved in cholesterol metabolism

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Hirche, F., Schröder, A., Knoth, B., Stangl, G. I., Eder, K.·2006·British Journal Of Nutrition

Abstract

Methionine has been shown to increase plasma cholesterol in animals. In the present study, mechanisms were investigated by which methionine could alter cholesterol metabolism. In the first experiment, forty growing rats were fed four casein-based diets differing in methionine content (2.6, 3.5, 4.5 or 6.0 g/kg) for 14 d. In the second experiment, isolated rat hepatocytes were incubated in media supplemented with 50, 100 or 200 micromol/l methionine. Dietary methionine tended to increase plasma homocysteine concentrations in the rats (P=0.058). A weak positive correlation between circulating homocysteine and plasma cholesterol was observed (R2 0.27, P<0.01). Rats fed 3.5 g/kg or more of methionine had higher concentrations of cholesterol in their plasma, in lipoprotein fractions of density (rho; kg/l) 1.006 1.063, and in liver than rats fed 2.6 g/kg methionine. Rats fed 6 g/kg methionine had a higher hepatic expression of 3-hydroxy-3-methylglutaryl coenzyme A reductase and cholesterol-7alpha-hydroxylase than rats fed less methionine. The phosphatidylcholine:phosphatidylethanolamine ratio in rat liver increased with rising dietary methionine concentration; the relative mRNA concentrations of phosphatidylethanolamine N-methyltransferase and cystathionine beta-synthase remained unaffected. Hepatocytes incubated in media supplemented with 100 or 200 micromol/l methionine had a higher cholesterol synthesis than hepatocytes incubated in a medium supplemented with 50 micromol/l methionine; the LDL uptake in hepatocytes was independent of the methionine concentration of the medium. In conclusion, the present study suggests that dietary methionine induces hypercholesterolaemia at least in part via an enhanced hepatic cholesterol synthesis.

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Authors
Hirche, F., Schröder, A., Knoth, B., Stangl, G. I., & Eder, K.
Affiliations
Martin Luther University Halle-Wittenberg (DE)
Corresponding author
Eder, K.
Venue
British Journal Of Nutrition
Published
2006-05
Volume
95
Issue
5
Pages
879-888
ISSN
  • 0007-1145 (ISSN-L)
  • 1475-2662
OpenAlex
W2001048848
Cited by
68
References
44
Citations by year
2026: 3 · 2025: 3 · 2024: 2 · 2023: 5 · 2022: 3 · 2021: 4 · 2020: 8 · 2019: 1 · 2018: 3 · 2017: 4 · 2016: 4 · 2015: 3 · 2014: 3 · 2013: 1 · 2012: 2
FWCI
3.05
Type
journal article
Language
en
Open access
Locations
  • British Journal Of Nutrition (publishedVersion)
  • PubMed (publishedVersion)
Funders
Deutsche Forschungsgemeinschaft
Topics
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
  • Health Sciences › Medicine › Rheumatology › Folate and B Vitamins Research
  • Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Animal Nutrition and Physiology
Keywords
dietary methionine, hypercholesterolemia, serum cholesterol, hepatic cholesterol synthesis, homocysteine, HMGR, CYP7A1, phosphatidylethanolamine N-methyltransferase, cystathionine beta-synthase, LDL uptake, hepatocytes, lipoprotein fractions, hepatic gene expression
MeSH terms
Amino Acids, Animals, Bile Acids and Salts, Cells, Cultured, Cholesterol, Diet, Eating, Feces, Gene Expression Regulation, Homocysteine, Lipids, Liver, Male, Methionine, Phosphatidylcholines, Phosphatidylethanolamines, Receptors, LDL, RNA, Messenger, Weight Gain, Rats, Sprague-Dawley, Hepatocytes, Lipid Metabolism, Rats

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