Modulation of tumorigenesis by dietary intervention is not mediated by SIRT1 catalytic activity.
The protein deacetylase SIRT1 is involved in the regulation of a large number of cellular processes that are thought to be required for cancer initiation and progression. Both SIRT1 activity and tumorigenesis can be influenced by dietary fat and polyphenolics. We set out to determine whether dietary modulations of tumorigenesis are mediated by SIRT1 catalytic functions. We introduced a mammary gland tumor-inducing transgene, MMTV-PyMT, into stocks of mice bearing a H355Y point mutation in the Sirt1 gene that abolishes SIRT1 catalytic activity. Tumor latency was reduced in animals fed a high fat diet but this effect was not dependent on SIRT1 activity. Resveratrol had little effect on tumor formation except in animals heterozygous for the mutant Sirt1 gene. We conclude that the effects of these dietary interventions on tumorigenesis are not mediated by modulation of SIRT1 catalytic activity.
Centre for Cancer Therapeutics, Ottawa Hospital Research Institute, Ottawa, Ontario, Canada.
Katherine V
KV
Clark-Knowles
Centre for Cancer Therapeutics, Ottawa Hospital Research Institute, Ottawa, Ontario, Canada.
Danielle
D
Dewar-Darch
Centre for Cancer Therapeutics, Ottawa Hospital Research Institute, Ottawa, Ontario, Canada.
Karen E
KE
Jardine
Centre for Cancer Therapeutics, Ottawa Hospital Research Institute, Ottawa, Ontario, Canada; Department of Medicine, University of Ottawa, Ottawa, Ontario, Canada.
Michael W
MW
McBurney
D000704:Analysis of Variance; D000818:Animals; D000952:Antigens, Polyomavirus Transforming / Q000235:genetics; D000972:Antineoplastic Agents, Phytogenic / Q000494:pharmacology; D055162:Biocatalysis; D002471:Cell Transformation, Neoplastic / Q000187:drug effects / Q000235:genetics*; D059305:Diet, High-Fat; D006579:Heterozygote; D008297:Male; D008325:Mammary Neoplasms, Experimental / Q000178:diet therapy / Q000235:genetics / Q000378:metabolism; D008324:Mammary Tumor Virus, Mouse / Q000235:genetics; D008822:Mice, Transgenic; D017354:Point Mutation; D000077185:Resveratrol; D056564:Sirtuin 1 / Q000235:genetics* / Q000378:metabolism; D013267:Stilbenes / Q000494:pharmacology; D047368:Tumor Burden / Q000187:drug effects / Q000235:genetics
D000952:Antigens, Polyomavirus Transforming; D000972:Antineoplastic Agents, Phytogenic; D013267:Stilbenes; C470545:Sirt1 protein, mouse; D056564:Sirtuin 1; D000077185:Resveratrol