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A snapshot of the hepatic transcriptome: ad libitum alcohol intake suppresses expression of cholesterol synthesis genes in alcohol-preferring (P) rats.

PloS one
January 1, 2014
Jonathon D Klein et al. (10 authors)
Journal ArticleResearch Support, N.I.H., ExtramuralHuman StudyAnimal Study
Extracted Claims (8)
InterventionDirectionEndpointPopulationDosageImpactClaim #
Moderate alcohol consumption
decrease
coronary heart disease
humans
null
is associated with reduced risk
#1
Abstinence
increase
coronary heart disease
humans
null
is linked to increased risk
#2
Heavier alcohol intake
increase
coronary heart disease
humans
null
is linked to increased risk
#3
Chronic consumption
no change
hepatic steatosis
alcohol-preferring (P) rats
null
does not produce significant hepatic steatosis
#4
Chronic moderate alcohol consumption
decrease
nine genes in the cholesterol biosynthesis pathway
inbred alcohol-preferring (iP10a) rats
null
led to down-regulation
#5
Chronic moderate alcohol consumption
no change
hepatic triglyceride levels
inbred alcohol-preferring (iP10a) rats
null
were indistinguishable from controls
#6
Chronic moderate alcohol consumption
no change
cholesterol levels
inbred alcohol-preferring (iP10a) rats
null
were indistinguishable from controls
#7
Chronic moderate alcohol consumption
no change
liver histology
inbred alcohol-preferring (iP10a) rats
null
were indistinguishable from controls
#8
Abstract

Research is uncovering the genetic and biochemical effects of consuming large quantities of alcohol. One prime example is the J- or U-shaped relationship between the levels of alcohol consumption and the risk of atherosclerotic cardiovascular disease. Moderate alcohol consumption in humans (about 30 g ethanol/d) is associated with reduced risk of coronary heart disease, while abstinence and heavier alcohol intake is linked to increased risk. However, the hepatic consequences of moderate alcohol drinking are largely unknown. Previous data from alcohol-preferring (P) rats showed that chronic consumption does not produce significant hepatic steatosis in this well-established model. Therefore, free-choice alcohol drinking in P rats may mimic low risk or nonhazardous drinking in humans, and chronic exposure in P animals can illuminate the molecular underpinnings of free-choice drinking in the liver. To address this gap, we captured the global, steady-state liver transcriptome following a 23 week free-choice, moderate alcohol consumption regimen (∼ 7.43 g ethanol/kg/day) in inbred alcohol-preferring (iP10a) rats. Chronic consumption led to down-regulation of nine genes in the cholesterol biosynthesis pathway, including HMG-CoA reductase, the rate-limiting step for cholesterol synthesis. These findings corroborate our phenotypic analyses, which indicate that this paradigm produced animals whose hepatic triglyceride levels, cholesterol levels and liver histology were indistinguishable from controls. These findings explain, at least in part, the J- or U-shaped relationship between cardiovascular risk and alcohol intake, and provide outstanding candidates for future studies aimed at understanding the mechanisms that underlie the salutary cardiovascular benefits of chronic low risk and nonhazardous alcohol intake.

Medical Subject Headings (MeSH)
Acyl Coenzyme AAlcohol DrinkingAnimalsBehavior, AnimalChoice BehaviorCholesterolDisease Models, AnimalDown-RegulationEthanolFemaleGene Expression ProfilingHumansLiverMolecular Sequence DataRatsSequence Analysis, RNA
Study Links
PubMed ID25542004
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