Cholesterol and nonalcoholic fatty liver disease

Renewed focus on an old villain

Thomas A. Kerr, Nicholas O. Davidson

Research output: Contribution to journalComment/debate

16 Citations (Scopus)

Abstract

Nonalcoholic fatty liver disease (NAFLD) is associated with increased cardiovascular and liver-related mortality. NAFLD is characterized by both triglyceride and free cholesterol (FC) accumulation without a corresponding increment in cholesterol esters. The aim of this study was to evaluate the expression of cholesterol metabolic genes in NAFLD and relate these to disease phenotype. NAFLD was associated with increased SREBP- 2 maturation, HMG CoA reductase (HMGCR) expression and decreased phosphorylation of HMGCR. Cholesterol synthesis was increased as measured by the circulating desmosterol:cholesterol ratio. miR-34a, a microRNA increased in NAFLD, inhibited sirtuin-1 with downstream dephosphorylation of AMP kinase and HMGCR. Cholesterol ester hydrolase was increased while ACAT-2 remained unchanged. LDL receptor expression was significantly decreased and similar in NAFLD subjects on or off statins. HMGCR expression was correlated with FC, histologic severity of NAFLD and LDL-cholesterol. These data demonstrate dysregulated cholesterol metabolism in NAFLD which may contribute to disease severity and cardiovascular risks.

Original languageEnglish (US)
Pages (from-to)1995-1998
Number of pages4
JournalHepatology
Volume56
Issue number5
DOIs
StatePublished - Nov 1 2012

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Cholesterol
Hydroxymethylglutaryl CoA Reductases
Desmosterol
Sirtuin 1
Sterol Esterase
Hydroxymethylglutaryl-CoA Reductase Inhibitors
Adenylate Kinase
Non-alcoholic Fatty Liver Disease
Cholesterol Esters
LDL Receptors
MicroRNAs
LDL Cholesterol
Triglycerides
Cardiovascular Diseases
Phosphorylation
Phenotype
Mortality
Liver
Genes

ASJC Scopus subject areas

  • Hepatology

Cite this

Cholesterol and nonalcoholic fatty liver disease : Renewed focus on an old villain. / Kerr, Thomas A.; Davidson, Nicholas O.

In: Hepatology, Vol. 56, No. 5, 01.11.2012, p. 1995-1998.

Research output: Contribution to journalComment/debate

Kerr, Thomas A. ; Davidson, Nicholas O. / Cholesterol and nonalcoholic fatty liver disease : Renewed focus on an old villain. In: Hepatology. 2012 ; Vol. 56, No. 5. pp. 1995-1998.
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N2 - Nonalcoholic fatty liver disease (NAFLD) is associated with increased cardiovascular and liver-related mortality. NAFLD is characterized by both triglyceride and free cholesterol (FC) accumulation without a corresponding increment in cholesterol esters. The aim of this study was to evaluate the expression of cholesterol metabolic genes in NAFLD and relate these to disease phenotype. NAFLD was associated with increased SREBP- 2 maturation, HMG CoA reductase (HMGCR) expression and decreased phosphorylation of HMGCR. Cholesterol synthesis was increased as measured by the circulating desmosterol:cholesterol ratio. miR-34a, a microRNA increased in NAFLD, inhibited sirtuin-1 with downstream dephosphorylation of AMP kinase and HMGCR. Cholesterol ester hydrolase was increased while ACAT-2 remained unchanged. LDL receptor expression was significantly decreased and similar in NAFLD subjects on or off statins. HMGCR expression was correlated with FC, histologic severity of NAFLD and LDL-cholesterol. These data demonstrate dysregulated cholesterol metabolism in NAFLD which may contribute to disease severity and cardiovascular risks.

AB - Nonalcoholic fatty liver disease (NAFLD) is associated with increased cardiovascular and liver-related mortality. NAFLD is characterized by both triglyceride and free cholesterol (FC) accumulation without a corresponding increment in cholesterol esters. The aim of this study was to evaluate the expression of cholesterol metabolic genes in NAFLD and relate these to disease phenotype. NAFLD was associated with increased SREBP- 2 maturation, HMG CoA reductase (HMGCR) expression and decreased phosphorylation of HMGCR. Cholesterol synthesis was increased as measured by the circulating desmosterol:cholesterol ratio. miR-34a, a microRNA increased in NAFLD, inhibited sirtuin-1 with downstream dephosphorylation of AMP kinase and HMGCR. Cholesterol ester hydrolase was increased while ACAT-2 remained unchanged. LDL receptor expression was significantly decreased and similar in NAFLD subjects on or off statins. HMGCR expression was correlated with FC, histologic severity of NAFLD and LDL-cholesterol. These data demonstrate dysregulated cholesterol metabolism in NAFLD which may contribute to disease severity and cardiovascular risks.

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