title: Marginal dietary thiamin deficiency induces the formation of colonic aberrant crypt foci (ACF) in rats.
abstract: Thiamin deficiency leads to the endogenous formation of genotoxic alpha-oxoaldehydes (glyoxals). To evaluate whether marginal deficiency poses a carcinogenesis risk we fed rats AIN-76A sucrose-based diets containing thiamin at 4.9 (control), 1.6 or 1.0 mg/kg diet and examined their colons after 160 days. Reduced thiamin increased aberrant crypt foci (ACF) from 1.14+/-0.46 to 3.70+/-1.17 and 2.60+/-1.02 ACF/colon in the absence of exogenous carcinogen or of symptoms of beriberi. Since typical Western diets can provide marginal levels of thiamin with high levels of simple sugars, individuals could be exposed to an increased risk of colon and perhaps other cancers.
authors.affiliation: Department of Nutritional Sciences, University of Toronto, 150 College Street, Toronto, Ont. M5S 3E2, Canada. wr.bruce@utoronto.ca
authors.forename: W Robert
authors.initials: WR
authors.lastname: Bruce
authors.forename: Rudolf
authors.initials: R
authors.lastname: Furrer
authors.forename: Nandita
authors.initials: N
authors.lastname: Shangari
authors.forename: Peter J
authors.initials: PJ
authors.lastname: O'Brien
authors.forename: Alan
authors.initials: A
authors.lastname: Medline
authors.forename: Yanping
authors.initials: Y
authors.lastname: Wang
mesh_terms: D000818:Animals; D001835:Body Weight; D003106:Colon / Q000473:pathology*; D003110:Colonic Neoplasms / Q000209:etiology; D004032:Diet; D008297:Male; D011230:Precancerous Conditions / Q000473:pathology; D051381:Rats; D011916:Rats, Inbred F344; D013832:Thiamine Deficiency / Q000473:pathology*