Regulation of hepatic fasting response by PPARγ coactivator-1α (PGC-1): Requirement for hepatocyte nuclear factor 4α in gluconeogenesis

James Rhee, Yusuke Inoue, J. Cliff Yoon, Pere Puigserver, Melina Fan, Frank J. Gonzalez, Bruce M. Spiegelman

Research output: Contribution to journalArticle

Abstract

The liver plays several critical roles in the metabolic adaptation to fasting. We have shown previously that the transcriptional coactivator peroxisome proliferator-activated receptor γ coactivator-1α (PGC-1α) is induced in fasted or diabetic liver and activates the entire program of gluconeogenesis. PGC-1α interacts with several nuclear receptors known to bind gluconeogenic promoters including the glucocorticoid receptor, hepatocyte nuclear factor 4α (HNF4α), and the peroxisome proliferator-activated receptors. However, the genetic requirement for any of these interactions has not been determined. Using hepatocytes from mice lacking HNF4α in the liver, we show here that PGC-1α completely loses its ability to activate key genes of gluconeogenesis such as phosphoenolpyruvate carboxykinase and glucose-6-phosphatase when HNF4α is absent. It is also shown that PGC-1α can induce genes of β-oxidation and ketogenesis in hepatocytes, but these effects do not require HNF4α. Analysis of the glucose-6-phosphatase promoter indicates a key role for HNF4α-binding sites that function robustly only when HNF4α is coactivated by PGC-1α. These data illustrate the involvement of PGC-1α in several aspects of the hepatic fasting response and show that HNF4α is a critical component of PGC-1α-mediated gluconeogenesis.

Original languageEnglish (US)
Pages (from-to)4012-4017
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume100
Issue number7
DOIs
StatePublished - Apr 1 2003
Externally publishedYes

ASJC Scopus subject areas

  • Genetics
  • General

Fingerprint Dive into the research topics of 'Regulation of hepatic fasting response by PPARγ coactivator-1α (PGC-1): Requirement for hepatocyte nuclear factor 4α in gluconeogenesis'. Together they form a unique fingerprint.

  • Cite this