Cited by 652FOXO transcription factor regulationMetabolism, Diabetes, and CancerFibroblast Growth Factor Research

The forkhead transcription factor Foxo1 (Fkhr) confers insulin sensitivity onto glucose-6-phosphatase expression

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Nakae, Jun, Kitamura, Tadahiro, Silver, David L., Accili, Domenico·2001·Journal of Clinical Investigation

Abstract

Type 2 diabetes is characterized by the inability of insulin to suppress glucose production in the liver and kidney.Insulin inhibits glucose production by indirect and direct mechanisms.The latter result in transcriptional suppression of key gluconeogenetic and glycogenolytic enzymes, phosphoenolpyruvate carboxykinase (Pepck) and glucose-6-phosphatase (G6p).The transcription factors required for this effect are incompletely characterized.We report that in glucogenetic kidney epithelial cells, Pepck and G6p expression are induced by dexamethasone (dex) and cAMP, but fail to be inhibited by insulin.The inability to respond to insulin is associated with reduced expression of the forkhead transcription factor Foxo1, a substrate of the Akt kinase that is inhibited by insulin through phosphorylation.Transduction of kidney cells with recombinant adenovirus encoding Foxo1 results in insulin inhibition of dex/cAMP-induced G6p expression.Moreover, expression of dominant negative Foxo1 mutant results in partial inhibition of dex/cAMP-induced G6p and Pepck expression in primary cultures of mouse hepatocyes and kidney LLC-PK1-FBPase + cells.These findings are consistent with the possibility that Foxo1 is involved in insulin regulation of glucose production by mediating the ability of insulin to decrease the glucocorticoid/cAMP response of G6p.

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  • Insulin represses expression of the phosphoenolpyruvate carboxykinase and G-6-Pase genes; PEPCK repression occurs by disrupting association of CREB and RNA polymerase II with the PEPCK gene promoter, whereas G-6-P suppression requires PKBα/Akt and FOXO1, whose expression is diminished by GSK-3 inhibition.

    “The second liver-specific effect of insulin is to repress the expression of the phosphoenolpyruvate carboxykinase and G-6-Pase genes; the first by disrupting the association of cAMP response element-binding protein and RNA polymerase II with the phosphoenolpyruvate carboxykinase gene promoter,23 whereas G-6-P suppression requires PKBα/Akt and forkhead transcription factor (FOXO1),24, 25 whose”

    From Pancreatic regulation of glucose homeostasis. (2016) · cites this paper as [24]

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Authors
Nakae, J., Kitamura, T., Silver, D. L., & Accili, D.
Affiliations
Columbia University (US)
Corresponding author
Accili, Domenico
Venue
Journal of Clinical Investigation
Published
2001-11-01
Volume
108
Issue
9
Pages
1359-1367
ISSN
0021-9738 (ISSN-L)
OpenAlex
W2127337885
Cited by
652
References
71
Citations by year
2026: 8 · 2025: 14 · 2024: 18 · 2023: 22 · 2022: 22 · 2021: 32 · 2020: 26 · 2019: 30 · 2018: 33 · 2017: 22 · 2016: 27 · 2015: 25 · 2014: 33 · 2013: 20 · 2012: 26
FWCI
8.03
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • American Diabetes Association
  • National Institutes of Health
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK057539, DK 57539)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › FOXO transcription factor regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fibroblast Growth Factor Research
Keywords
FOXO1, forkhead transcription factor, insulin sensitivity, glucose-6-phosphatase, phosphoenolpyruvate carboxykinase, gluconeogenesis, type 2 diabetes, insulin signaling, Akt kinase, glucocorticoid response, cAMP signaling, renal epithelial cells, hepatocytes, insulin resistance
MeSH terms
Forkhead Box Protein O1, Cyclic AMP, Adenoviridae, Animals, Cells, Cultured, Dexamethasone, DNA-Binding Proteins, Dose-Response Relationship, Drug, Epithelial Cells, Gene Expression Regulation, Genes, Dominant, Glucocorticoids, Glucose, Glucose-6-Phosphatase, Humans, Insulin, Kidney, Nerve Tissue Proteins, Phosphorylation, Protein Binding, RNA, Messenger, Time Factors, Transcription Factors, Transcription, Genetic, Transduction, Genetic, Hepatocytes, Rats, Forkhead Transcription Factors

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