Redistribution of CD95, DR4 and DR5 in rafts accounts for the synergistic toxicity of resveratrol and death receptor ligands in colon carcinoma cells.
The natural phytoalexin resveratrol (3, 5, 4'-trihydroxystilbene) exhibits both chemopreventive and antitumor activities through a variety of mechanisms. We have shown previously that resveratrol-induced apoptosis of a human colon cancer cell line involved the redistribution of CD95 (Fas/Apo-1) into lipid rafts. Here, we show that, in colon cancer cells that resist to resveratrol-induced apoptosis, the polyphenol also induces a redistribution of death receptors into lipid rafts. This effect sensitizes these tumor cells to death receptor-mediated apoptosis. In resveratrol-treated cells, tumor necrosis factor (TNF), anti-CD95 antibodies and TNF-related apoptosis-inducing ligand (TRAIL) activate a caspase-dependent death pathway that escapes Bcl-2-mediated inhibition. Resveratrol does not enhance the number of death receptors at the surface of tumor cells but induces their redistribution into lipid rafts and facilitates the caspase cascade activation in response to death receptor stimulation. The cholesterol sequestering agent nystatin prevents resveratrol-induced death receptor redistribution and cell sensitization to death receptor stimulation. Thus, whatever its ability to induce apoptosis in a tumor cell, resveratrol induces redistribution of death receptors into lipid rafts. This redistribution sensitizes the cells to death receptor stimulation. Such a sensitizing effect may be of therapeutic interest if TRAIL agonists are introduced in clinics.
Delmas
Dominique
D
GDR-CNRS 2583, IFR92 Laboratory of Molecular and Cellular Biology, University of Burgundy, 6 Boulevard Gabriel, Dijon 21000, France.
Rébé
Cédric
C
Micheau
Olivier
O
Athias
Anne
A
Gambert
Philippe
P
Grazide
Solène
S
Laurent
Guy
G
Latruffe
Norbert
N
Solary
Eric
E
D000972:Antineoplastic Agents, Phytogenic / Q000494:pharmacology; D017209:Apoptosis; D051017:Apoptosis Regulatory Proteins; D015153:Blotting, Western; D002277:Carcinoma / Q000378:metabolism*; D020169:Caspases / Q000378:metabolism; D045744:Cell Line, Tumor; D003110:Colonic Neoplasms / Q000378:metabolism*; D005434:Flow Cytometry; D006801:Humans; D008024:Ligands; D050356:Lipid Metabolism; D008055:Lipids / Q000737:chemistry; D008562:Membrane Glycoproteins / Q000378:metabolism; D021962:Membrane Microdomains / Q000737:chemistry* / Q000378:metabolism; D008928:Mitochondria / Q000378:metabolism; D009761:Nystatin / Q000494:pharmacology; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000737:chemistry; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand; D018124:Receptors, Tumor Necrosis Factor / Q000096:biosynthesis*; D000077185:Resveratrol; D015398:Signal Transduction; D013267:Stilbenes / Q000494:pharmacology; D053221:TNF-Related Apoptosis-Inducing Ligand; D013997:Time Factors; D014162:Transfection; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism; D019014:fas Receptor / Q000096:biosynthesis*
D000972:Antineoplastic Agents, Phytogenic; D051017:Apoptosis Regulatory Proteins; D008024:Ligands; D008055:Lipids; D008562:Membrane Glycoproteins; D019253:Proto-Oncogene Proteins c-bcl-2; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand; D018124:Receptors, Tumor Necrosis Factor; D013267:Stilbenes; D053221:TNF-Related Apoptosis-Inducing Ligand; C105190:TNFRSF10A protein, human; C505639:TNFRSF10B protein, human; C505653:TNFSF10 protein, human; D014409:Tumor Necrosis Factor-alpha; D019014:fas Receptor; D009761:Nystatin; D020169:Caspases; D000077185:Resveratrol