SirT1-null mice develop tumors at normal rates but are poorly protected by resveratrol.

Abstract:

:The function of the class III histone deacetylase, Sir2, in promoting lifespan extension is well established in small model organisms. By analogy, SirT1, the mammalian orthologue of Sir2, is a candidate gene to slow down aging and forestall the onset of age-associated diseases. We have used SirT1-null mice to study the function of SirT1 in susceptibility to tumorigenesis. The number of intestinal polyps induced in mice carrying the Apc(min) mutation was unaffected by the SirT1 genotype although the average polyp size was slightly smaller in the SirT1-null animals. Similarly, the presence or absence of SirT1 had no effect on incidence and tumor load of skin papillomas induced by the classical two-stage carcinogenesis protocol. We found that resveratrol topically applied to the skin profoundly reduced tumorigenesis. This chemoprotective effect was significantly reduced but not ablated in SirT1-null mice, suggesting that part of the protection afforded by resveratrol requires the SirT1-encoded protein. Thus, our results suggest that SirT1 does not behave like a classical tumor-suppressor gene but the antitumor activity of resveratrol is mediated at least in part by SirT1.

journal_name

Oncogene

journal_title

Oncogene

authors

Boily G,He XH,Pearce B,Jardine K,McBurney MW

doi

10.1038/onc.2009.147

subject

Has Abstract

pub_date

2009-08-13 00:00:00

pages

2882-93

issue

32

eissn

0950-9232

issn

1476-5594

pii

onc2009147

journal_volume

28

pub_type

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