HOMEPRODUCTSCOMPANYCONTACTFAQResearchDictionaryPharmaSign Up FREE or Login

Identification of a novel proapoptotic function of resveratrol in fat cells: SIRT1-independent sensitization to TRAIL-induced apoptosis.

Abstract
The phytochemical resveratrol has recently gained attention for its protection against metabolic disease and for extension of life span, which have been linked to its metabolic effects and SIRT1 activation in fat cells. However, little is known about the effect of resveratrol on fat cell apoptosis. Here, we identify a novel, SIRT1-independent mechanism by which resveratrol regulates fat cell numbers. We demonstrate for the first time that resveratrol enhances TNF-related apoptosis-inducing ligand (TRAIL)- or CD95-induced apoptosis of human preadipocytes in a highly synergistic manner (EC(50) at 72 h: resveratrol, >300 microM; TRAIL, >100 ng/ml; combination: 30 microM resveratrol and 10 ng/ml TRAIL, combination index 0.4). Similar results in primary human preadipocytes prepared from subcutaneous white adipose tissue and mature human adipocytes underline the relevance to human physiology. Mechanistic studies reveal that resveratrol inhibits PI3K-driven phosphorylation of Akt, leading to increased Bax activation, loss of mitochondrial membrane potential, cytochrome c release, and caspase-dependent apoptosis. The synergistic interaction of resveratrol and TRAIL depends on the intrinsic apoptosis pathway and caspases, since Bcl-2 overexpression and the caspase inhibitor zVAD.fmk inhibit apoptosis, whereas knockdown of SIRT1 by RNA interference has no effect. The discovery of this novel activity of resveratrol significantly advances the knowledge of fat tissue regulation by resveratrol and has important implications for its use in metabolic and age-related diseases.
AuthorsIsabelle Mader, Martin Wabitsch, Klaus-Michael Debatin, Pamela Fischer-Posovszky, Simone Fulda
JournalFASEB journal : official publication of the Federation of American Societies for Experimental Biology (FASEB J) Vol. 24 Issue 6 Pg. 1997-2009 (Jun 2010) ISSN: 1530-6860 [Electronic] United States
PMID20097879 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Death Domain Receptor Signaling Adaptor Proteins
  • Proto-Oncogene Proteins c-bcl-2
  • RNA, Messenger
  • Receptors, TNF-Related Apoptosis-Inducing Ligand
  • Receptors, Tumor Necrosis Factor
  • Stilbenes
  • TNF-Related Apoptosis-Inducing Ligand
  • TNFRSF10A protein, human
  • TNFSF10 protein, human
  • bcl-2-Associated X Protein
  • Cytochromes c
  • Caspases
  • SIRT1 protein, human
  • Sirtuin 1
  • Resveratrol
Topics
  • Adipocytes (cytology, drug effects, metabolism)
  • Apoptosis (drug effects)
  • Blotting, Western
  • Caspases (metabolism)
  • Cells, Cultured
  • Cytochromes c (metabolism)
  • Death Domain Receptor Signaling Adaptor Proteins (genetics, metabolism)
  • Humans
  • Immunoprecipitation
  • Membrane Potential, Mitochondrial (drug effects)
  • Proto-Oncogene Proteins c-bcl-2 (genetics, metabolism)
  • RNA, Messenger (genetics, metabolism)
  • Receptors, TNF-Related Apoptosis-Inducing Ligand
  • Receptors, Tumor Necrosis Factor (genetics, metabolism)
  • Resveratrol
  • Reverse Transcriptase Polymerase Chain Reaction
  • Sirtuin 1 (genetics, metabolism)
  • Stilbenes (pharmacology)
  • TNF-Related Apoptosis-Inducing Ligand (genetics, metabolism)
  • bcl-2-Associated X Protein (genetics, metabolism)

Join CureHunter, for free Research Interface BASIC access!

Take advantage of free CureHunter research engine access to explore the best drug and treatment options for any disease. Find out why thousands of doctors, pharma researchers and patient activists around the world use CureHunter every day.
Realize the full power of the drug-disease research graph!


Choose Username:
Email:
Password:
Verify Password:
Enter Code Shown: