Header

UZH-Logo

Maintenance Infos

Expression signature of glycidamide, the reactive metabolite of the widespread food carcinogen acrylamide


Clement, F C. Expression signature of glycidamide, the reactive metabolite of the widespread food carcinogen acrylamide. 2007, University of Zurich, Vetsuisse Faculty.

Abstract

Recent findings of acrylamide in foods have sparked renewed interest in assessing human health hazards associated with the exposure to this vinyl compound. Acrylamide is tumorigenic at high doses in rodents, but cancer risk
projections in the human population remain problematic since the molecular pathogenesis of acrylamide at the low level of dietary uptake is not understood. The present thesis is concerned with the question of whether transcriptional responses may amplify the known genotoxicity of acrylamide. Therefore, we used high-density DNA microarrays and PCR validations to assess genomewide
messenger profiles induced in human cells by acrylamide and
glycidamide, its more reactive metabolite. The expression changes are characterized by the up-regulation of cytoprotective factors including the glutathione system, carbonyl reductases and various antioxidants. Low-dose
experiments indicate that epoxide hydrolase 1 represents the most sensitive biomarker for the internal glycidamide exposure. At higher concentrations, glycidamide induces markers of tumor progression such as steroid hormone
activators, regulators of nuclear factor-κB, growth stimulators and apoptosis inhibitors. Concomitantly, growth suppressors and cell adhesion molecules are suppressed. The main implication of these findings for risk assessment is that transcriptional signatures associated with tumor cell progression may be expected only at higher doses that exceed the range of ordinary dietary exposure.

Abstract

Recent findings of acrylamide in foods have sparked renewed interest in assessing human health hazards associated with the exposure to this vinyl compound. Acrylamide is tumorigenic at high doses in rodents, but cancer risk
projections in the human population remain problematic since the molecular pathogenesis of acrylamide at the low level of dietary uptake is not understood. The present thesis is concerned with the question of whether transcriptional responses may amplify the known genotoxicity of acrylamide. Therefore, we used high-density DNA microarrays and PCR validations to assess genomewide
messenger profiles induced in human cells by acrylamide and
glycidamide, its more reactive metabolite. The expression changes are characterized by the up-regulation of cytoprotective factors including the glutathione system, carbonyl reductases and various antioxidants. Low-dose
experiments indicate that epoxide hydrolase 1 represents the most sensitive biomarker for the internal glycidamide exposure. At higher concentrations, glycidamide induces markers of tumor progression such as steroid hormone
activators, regulators of nuclear factor-κB, growth stimulators and apoptosis inhibitors. Concomitantly, growth suppressors and cell adhesion molecules are suppressed. The main implication of these findings for risk assessment is that transcriptional signatures associated with tumor cell progression may be expected only at higher doses that exceed the range of ordinary dietary exposure.

Statistics

Downloads

134 downloads since deposited on 23 Mar 2009
10 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Dissertation
Referees:Naegeli H, Hofmann-Lehmann R
Communities & Collections:05 Vetsuisse Faculty > Institute of Veterinary Pharmacology and Toxicology
Dewey Decimal Classification:570 Life sciences; biology
Language:English
Date:2007
Deposited On:23 Mar 2009 11:52
Last Modified:06 Dec 2017 14:47
Number of Pages:50
Funders:Swiss National Science Foundation

Download

Download PDF  'Expression signature of glycidamide, the reactive metabolite of the widespread food carcinogen acrylamide'.
Preview
Filetype: PDF
Size: 3MB