Potential role of Branched-chain amino acids in glucose metabolism through the accelerated induction of the glucose-sensing apparatus in the liver

Nobito Higuchi, Masaki Kato, Masayuki Miyazaki, Masatake Tanaka, Motoyuki Kohjima, Tetsuhide Ito, Makoto Nakamuta, Munechika Enjoji, Kazuhiro Kotoh, Ryoichi Takayanagi

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

Branched-chain amino acids (BCAAs) have a potential to improve glucose metabolism in cirrhotic patients; however, the contribution of liver in this process has not been clarified. To estimate the effect of BCAA on glucose metabolism in liver, we evaluated the mRNA expression levels of glucose-sensing apparatus genes in HepG2 cells and in rat liver after oral administration of BCAA. HepG2 cells were cultured in low glucose (100 mg/dl) or high glucose (400 mg/dl) in the absence or presence of BCAA. The mRNA expression levels and protein levels of GLUT2 and liver-type glucokinase (L-GK) were estimated using RT-PCR and immunoblotting. The expression levels of transcriptional factors, including SREBP-1c, ChREBP, PPAR-gm and LXRα, were estimated. The mRNA expression levels of transcriptional factors, glycogen synthase, and genes involved in gluconeogenesis were evaluated in rat liver at 3 h after the administration of BCAA. BCAA accelerated the expression of GLUT2 and L-GK in HepG2 cells in high glucose. Expression levels of ChREBP, SREBP-1c, and LXRα were also increased in this condition. BCAA administration enhanced the mRNA expression levels of L-GK, SREBP-1c, and LXRα and suppressed the expression levels of G-6-Pase in rat liver, without affecting the expression levels of glycogen synthase or serum glucose concentrations. BCAA administration enhanced the bioactivity of the glucose-sensing apparatus, probably via the activation of a transcriptional mechanism, suggesting that these amino acids may improve glucose metabolism through the accelerated utility of glucose and glucose-6-phosphate in the liver. J. Cell.

Original languageEnglish
Pages (from-to)30-38
Number of pages9
JournalJournal of Cellular Biochemistry
Volume112
Issue number1
DOIs
Publication statusPublished - Jan 2011

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Fingerprint Dive into the research topics of 'Potential role of Branched-chain amino acids in glucose metabolism through the accelerated induction of the glucose-sensing apparatus in the liver'. Together they form a unique fingerprint.

  • Cite this