Adenovirus-mediated overexpression of sterol regulatory element binding protein-1c mimics insulin effects on hepatic gene expression and glucose homeostasis in diabetic mice.

D Bécard I Hainault Dalila Azzout-Marniche 1 L Bertry-Coussot P Ferré 2 F. Foufelle 2
1 PNCA - Physiologie de la Nutrition et du Comportement Alimentaire
2 CRC - Centre de Recherche des Cordeliers
Abstract : In vitro, the transcription factor sterol regulatory element binding protein-1c (SREBP-1c) mimics the positive effects of insulin on hepatic genes involved in glucose utilization, such as glucokinase (GK) and enzymes of the lipogenic pathway, suggesting that it is a key factor in the control of hepatic glucose metabolism. Decreased glucose utilization and increased glucose production by the liver play an important role in the development of the hyperglycemia in diabetic states. We thus reasoned that if SREBP-1c is indeed a mediator of hepatic insulin action, a hepatic targeted overexpression of SREBP-1c should greatly improve glucose homeostasis in diabetic mice. This was achieved by injecting streptozotocin-induced diabetic mice with a recombinant adenovirus containing the cDNA of the mature, transcriptionally active form of SREBP-1c. We show here that overexpressing SREBP-1c specifically in the liver of diabetic mice induces GK and lipogenic enzyme gene expression and represses the expression of phosphoenolpyruvate carboxykinase, a key enzyme of the gluconeogenic pathway. This in turn increases glycogen and triglyceride hepatic content and leads to a marked decrease in hyperglycemia in diabetic mice. We conclude that SREBP-1c has a major role in vivo in the long-term control of glucose homeostasis by insulin.
Document type :
Journal articles
Complete list of metadatas
https://hal-agroparistech.archives-ouvertes.fr/hal-01611456
Contributor : Dalila Azzout-Marniche <>
Submitted on : Thursday, October 5, 2017 - 8:27:51 PM
Last modification on : Tuesday, May 28, 2019 - 1:45:26 AM

Identifiers

  • HAL Id : hal-01611456, version 1
  • PUBMED : 11679417

Collections

AGROPARISTECH | INRA | EPHE | USPC | PSL | CORDELIERS | UPMC | UNIV-PARIS5 | SORBONNE-UNIVERSITE | UNIV-PARIS7 | SU-SCIENCES

Citation

D Bécard, I Hainault, Dalila Azzout-Marniche, L Bertry-Coussot, P Ferré, et al.. Adenovirus-mediated overexpression of sterol regulatory element binding protein-1c mimics insulin effects on hepatic gene expression and glucose homeostasis in diabetic mice.. Diabetes, American Diabetes Association, 2001, pp.2425-30. ⟨hal-01611456⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

381

Contact

support.ccsd.cnrs.fr
hal.support@ccsd.cnrs.fr
Logo CCSD