Carbohydrate-response element-binding protein deletion alters substrate utilization producing an energy-deficient liver

Shawn C. Burgess, Katsumi Iizuka, Ho Jeoung Nam, Robert Harris, Yoshihiro Kashiwaya, Richard L. Veech, Tatsuya Kitazume, Kosaku Uyeda

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Livers from mice lacking the carbohydrate-responsive element-binding protein (ChREBP) were compared with wild type (WT) mice to determine the effect of this transcription factor on hepatic energy metabolism. The pyruvate dehydrogenase complex was considerably more active in ChREBP-/- mice because of diminished pyruvate dehydrogenase kinase activity. Greater pyruvate dehydrogenase complex activity caused a stimulation of lactate and pyruvate oxidation, and it significantly impaired fatty acid oxidation in perfused livers from ChREBP-/- mice. This shift in mitochondrial substrate utilization led to a 3-fold reduction of the free cytosolic [NAD +]/[NADH] ratio, a 1.7-fold increase in the free mitochondrial [NAD+]/[NADH] ratio, and a 2-fold decrease in the free cytosolic [ATP]/[ADP][Pi] ratio in the ChREBP-/- liver compared with control. Hepatic pyruvate carboxylase flux was impaired with ChREBP deletion secondary to decreased fatty acid oxidation, increased pyruvate oxidation, and limited pyruvate availability because of reduced activity of liver pyruvate kinase and malic enzyme, which replenish pyruvate via glycolysis and pyruvate cycling. Overall, the shift from fat utilization to pyruvate and lactate utilization resulted in a decrease in the energy of ATP hydrolysis and a hypo-energetic state in the livers of ChREBP-/- mice.

Original languageEnglish
Pages (from-to)1670-1678
Number of pages9
JournalJournal of Biological Chemistry
Volume283
Issue number3
DOIs
StatePublished - Jan 18 2008

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Response Elements
Pyruvic Acid
Liver
Carrier Proteins
Carbohydrates
NAD
Substrates
Pyruvate Dehydrogenase Complex
Oxidation
Lactic Acid
Fatty Acids
Adenosine Triphosphate
Pyruvate Carboxylase
Pyruvate Kinase
Adenosine Diphosphate
Glycolysis
Hydrolysis
Transcription Factors
Energy Metabolism
Fats

ASJC Scopus subject areas

  • Biochemistry

Cite this

Carbohydrate-response element-binding protein deletion alters substrate utilization producing an energy-deficient liver. / Burgess, Shawn C.; Iizuka, Katsumi; Nam, Ho Jeoung; Harris, Robert; Kashiwaya, Yoshihiro; Veech, Richard L.; Kitazume, Tatsuya; Uyeda, Kosaku.

In: Journal of Biological Chemistry, Vol. 283, No. 3, 18.01.2008, p. 1670-1678.

Research output: Contribution to journalArticle

Burgess, Shawn C. ; Iizuka, Katsumi ; Nam, Ho Jeoung ; Harris, Robert ; Kashiwaya, Yoshihiro ; Veech, Richard L. ; Kitazume, Tatsuya ; Uyeda, Kosaku. / Carbohydrate-response element-binding protein deletion alters substrate utilization producing an energy-deficient liver. In: Journal of Biological Chemistry. 2008 ; Vol. 283, No. 3. pp. 1670-1678.
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